JorgeARamirez

Education

Research

Academic Positions

Teaching

Awards

Publications

Jorge A Ramirez

Hydrologic Science and Engineering
Department of Civil and Environmental Engineering
Colorado State University
Fort Collins, CO 80523-1372
(970) 491-7621
(970) 491-7727 - Fax
e-mail: Jorge.Ramirez@ColoState.edu


EDUCATION
Ph.D. in Hydrometeorology, M.I.T., Cambridge, MA, February 1988.

M.S. in Civil Engineering - Hydrology and Water Resources, M.I.T., Cambridge, MA, June 1982

Ingeniero Civil, Facultad de Minas (School of Mines), Universidad Nacional, Medellin, COLOMBIA, January 1981.


RESEARCH INTERESTS

Hydrometeorology. Global scale hydrology and climate change. Vulnerability analysis. Soil moisture and vegetation interactions. Land surface/atmosphere interactions. Runoff production mechanisms, river basin geomorphology, downstream hydraulic geometry and optimal channel networks. Regional water balance. Evapotranspiration and Complementary Relationship. Surface interactions in Hortonian overland flow. Spatial and temporal heterogeneity of hydroclimatic variables and their impact on hydrologic response. Hydrologic scaling. Hydrologic impact assessment studies. Description of distribution and variability of mesoscale precipitation fields. Physically-based parameterization of stochastic hydrologic precipitation models. Physically-based, distributed watershed modeling. Development of knowledge-based decision support systems for water resource system management. Optimal irrigation scheduling. Water resource systems modeling, optimization, and control.


ACADEMIC POSITIONS

Colorado State University, Fort Collins, CO.

Professor of Civil and Environmental Engineering, Hydrologic Science and Engineering Program. July 2005 -

Associate Professor of Civil and Environmental Engineering, Hydrologic Science and Engineering Program. June 1996 - June 2005

Assistant Professor of Civil and Environmental Engineering, Hydrologic Science and Engineering Program. 1 October 1990 - May 1996

Swiss Federal Institute of Technology (ETH-Z), Zurich, Switzerland.

Visiting Professor, Institute of Environmental Engineering, Hydrology and Water Resources Management, 1 September 2006 - 31 August 2007

Center for Environmental Research and Monitoring (CIMA), University of Genoa, Savona, Italy.

Visiting Scientist, 1 June 1998 - 1 December 1998

University Corporation for Atmospheric Research, Boulder, CO.

Visiting Scientist & Lead Instructor Hydrometeorology- Cooperative Program for Operational Meteorology, Education and Training. 1 June 1995 - 31 July 1995

Universities Space Research Association, NASA Marshall Space Flight Center/Earth Science and Applications Division, Huntsville, ALABAMA.

Research Associate. 16 October 1989 - 30 September 1990

Facultad Nacional de Minas, Postgrado en Recursos Hidráulicos, Medellín, COLOMBIA.

Associate Professor. January 1989 - October 1989
International Expert, Interamerican Development Bank/Colombian Institute for Higher Education (ICFES).
January 1989 - April 1989

National Institute of Hydrology, Roorkee, INDIA.

Hydrometeorology Consultant United Nations Development Programme
December 1993 - January 1994

Facultad Nacional de Minas, Medellín, COLOMBIA. Empresas Públicas de Medellín (Public Utility Company of Medellín).

Evaluation of Climate Variability Impacts on Water Resource Systems in Particular with Respect to Power Generation Expert January 1993 - May 1993

Rocky Mountain University Consortium.

Review of environmental risk assessment document Incremental Risk Assessment Methodology for Rocky Flats Plant. Expert June 1992 - February 1993

Universities Space Research Association, NASA Marshall Space Flight Center/Earth Science and Applications Division, Huntsville, ALABAMA.

Hydrology Consultant 25 May 1992 - 15 June 1992
Hydrology Consultant 19 November 1991 - 24 November 1991
Hydrology Consultant 20 May 1991 - 24 May 1991

M.I.T., Cambridge, MA at the Ralph M. Parsons Laboratory for Water Resources.

Postdoctoral Research Associate December 1987 - November 1988
Research Assistant, February 1984 - November 1987, and February 1980- January 1982.
Teaching Assistant, January 1982 - June 1982


TEACHING

Undergraduate Courses:

CIVE 261 Engineering Mechanics - Dynamics
CIVE 322/422 Basic Hydrology

Graduate Courses:

CIVE 520 Physical Hydrology
CIVE 522 Engineering Hydrology
CIVE 625 Quantitative Eco-Hydrology
CIVE 722 Large Scale Hydrology
EY 592 Seminar on Bio-complexity
CE 624 Control of Floods and Droughts
CE 695cv Seminar in Water Resources
CE 720 Theoretical Hydrology
CE 695cv Ethics in Science and Engineering

Courses taught at foreign universities:

CIVE 322/422 Basic Hydrology (at Water Resources University, Hanoi, Vietnam, Summer 2014)
CIVE 261 Engineering Mechanics - Dynamics (at Water Resources University, Hanoi, Vietnam, Summer 2013)
102-1238-00L Multidisciplinary Hydrologic Science (at ETH-Z, Spring 2007)
CIVE 722 Hydrometeorology and Large Scale Hydrology (at Universidad de los Andes, Bogota, Colombia, Summer 2003)
CIVE 722 Large Scale Hydrology
(at National Institute of Hydrology, Indian Institute of Technology, Roorkee, India, Winter 1993-94)


HONORS/AWARDS
National Panel And Committee Membership


PUBLICATIONS

Papers in Refereed Journals

Quebbeman, J.A. and J. A. Ramirez (2016), Optimal Allocation of Leaf-Level Nitrogen: Implications for Covariation of Vcmax and Jmax and Photosynthetic Downregulation, Journal of Geophysical Research: Biogeosciences, doi: 10.1002/2016JG003473.

Kaptue, A. T., N. P. Hanan, L. Prihodko,and J. A. Ramirez (2015), Spatial and temporal characteristics of rainfall in Africa: Summary statistics for temporal downscaling, Water Resour. Res., 51,2668–2679, doi:10.1002/2014WR015918.

Foti, R*, J.A. Ramirez, and T.C. Brown, 2014: Response surfaces of vulnerability to climate change: the Colorado River Basin, the High Plains, and California. Climatic Change. DOI 10.1007/s10584-014-1178-0

Foti, R*., J.A. Ramirez, and T.C. Brown, 2014: A probabilistic framework for assessing vulnerability to climate variability and change: the case of the US water supply system. Climatic Change. DOI 10.1007/s10584-014-1111-6

Medina, Isaac D. A. Scott Denning, Ian T. Baker, Jorge A. Ramirez, and David A. Randall, 2014. A sampling method for improving the representation of spatially varying precipitation and soil moisture using the Simple Biosphere Model. Journal of Advances in Modeling Earth Systems, Vol. 6, 1–11, doi:10.1002/2013MS000251.

Brown T.C., Foti R.*, Ramirez J.A., 2013: Projected freshwater withdrawals in the United States under a changing climate. Water Resour. Res. 49:1259-1276.

Foti, R* and Ramirez, J.A., 2012. A mechanistic description of the formation and evolution of vegetation patterns. Hydrol. Earth Syst. Sci., 17, 63–84, 2013 doi:10.5194/hess-17-63-2013.

Kochendorfer, J.P.* and Ramirez, J.A., 2010. Ecohydrological controls on vegetation density and evapotranspiration partitioning across the climatic gradients of the central United States. Hydrol. Earth Syst. Sci., 14, 2121-2139, doi:10.5194/hess-14-2121-2010, 2010.

Kochendorfer, J.P.* and Ramirez, J.A., 2010. Modeling the monthly mean soil water balance with a statistical-dynamical ecohydrology model as coupled to a two-component canopy model. Hydrol. Earth Syst. Sci., 14, 2099-2120, doi:10.5194/hess-14-2099-2010, 2010.

Kang, B*. and J. A. Ramírez, 2010:A coupled stochastic space-time intermittent random cascade model for rainfall downscaling. Water Resour. Res., 46, W10534, doi:10.1029/2008WR007692.

Trujillo, Ernesto*, J. A. Ramirez, and K. Elder, 2009: Scaling properties and spatial organization of snow depth fields in sub-alpine forest and alpine tundra. Hydrological Processes Journal, Vol.23(11), pp. 1575-1590..

Kochendorfer, J.P.* and Ramirez, J.A., 2008. Ecohydrological controls on vegetation density and evapotranspiration partitioning across the climatic gradients of the central United States. Hydrol. Earth Syst. Sci. Discuss., 5, 649-700, doi:10.5194/hessd-5-649-2008, 2008.

Kochendorfer, J.P.* and Ramirez, J.A., 2008. Modeling the monthly mean soil water balance with a statistical-dynamical ecohydrology model as coupled to a two-component canopy model. Hydrol. Earth Syst.Discuss., 5, 579-648, doi:10.5194/hessd-5-579-2008, 2008.

Sherrill, K. R., Laituri, M. J., Helmer, E. H., Ramirez, J. A., Blanco, J. F., Hein, K., and Pike, A. S.: Road and stream network connectivity and potential: northeastern Puerto Rico, an exploratory analysis, Hydrol. Earth Syst. Sci. Discuss., 5, 1731-1763, doi:10.5194/hessd-5-1731-2008, 2008.

Erskine, R. H.* ; T. R. Green, J. A. Ramirez, and L. H. MacDonald, 2007 : Digital Elevation Accuracy and Grid Cell Size: Effects on Computed Terrain Attributes. Soil Science Society of America Journal doi:10.2136/sssaj2005.0142

Trujillo, Ernesto*, Ramirez, J.A. and K. Elder , 2007: Topographic, Meteorologic, and Canopy Controls on the Scaling Characteristics of the Spatial Distribution of Snow Depth Fields. Water Resources Research doi:10.1029/2006WR005317, 2007.

Kang, B*. and J. A. Ramírez, 2007: The Response of Streamflow to weather variability under climate change conditions in the Colorado Rockies. Journal of Hydrologic Engineering. doi: 10.1061/(ASCE)1084-0699 (2007)12:1(63)

Erskine*, R. H.; T. R. Green, J. A. Ramirez, and L. H. MacDonald, 2006: Comparison of grid-based algorithms for computing contributing area. Water Resources Research 42, W09416, doi:10.1029/2005WR004648.

Marin* , S. and J. A. Ramírez, 2006: The Response of Precipitation and Surface Hydrology to Tropical Macro-climate Forcing in Colombia. Hydrological Processes Journal. 20, 3759-3789.

Ramírez, J.A., M * Hobbins, and T. C. Brown , 2005: Observational evidence of the complementary relationship in regional evaporation lends strong support for Bouchet’s hypothesis, Geophys. Res. Lett. , 32 , L15401, doi:10.1029/2005GL023549.

Raff, D.* , and J. A. Ramirez , 2005: A Physical, Mechanistic and Fully Coupled Hillslope Hydrology Model. International Journal for Numerical Methods in Fluids. 49(11), 1193-1212.

Kochendorfer, J. P.* and J. A. Ramírez , 2005: The Impact of Land Atmosphere Interactions in the Temporal Variability of Soil Moisture. Journal of Hydrometeorology. Vol 6. No. 1, 53-67 .

Hobbins, M.*, J. A. Ramírez, and T. C. Brown , 2004: Trends in Pan Evaporation and Actual Evaporation Across the Conterminous U.S.: Paradoxical or Complementary? Geophysical Research Letters. Vol 31, L13503.

Raff, D.*, J. A. Ramirez, and J. Smith , 2004: Hillslope Drainage Development with Time, A Physical Experiment. Geomorphology, Vol. 62, pp 169-180.

Barton, S.* and J. A. Ramirez , 2004: Combined Effects of ENSO and PDO on Seasonal Water Supply in the Columbia River Basin. Journal of Water Resources Planning and Management, Vol. 130, No. 4, pp. 281 – 289.

Molnar, P.* and J. A. Ramírez , 2002: On Downstream Hydraulic Geometry and Optimal Energy Expenditure: Ashley and Taieri Rivers, New Zealand. Journal of Hydrology ; 259. pp. 105-115.

Fiedler, F. R.*, G.W. Frasier, J.A. Ramirez, and L.R. Ahuja , 2002: Hydrologic response of grasslands: effects of grazing, interactions, and scale, ASCE Journal of Hydrologic Engineering, 7(4), pp. 293-301.

Lanza, L.G., J. A. Ramírez and E. Todini , 2001: Stochastic Rainfall Interpolation and Downscaling. EGS Hydrology and Earth System Science, Vol. 5(2), 139 - 143.

Hobbins, M. T.*, J. A. Ramírez, and T. C. Brown , 2001: The Complementary Relationship In Estimation Of Regional Evapotranspiration: An Enhanced Advection-Aridity Model. Water Resources Research. Vol. 37(5), 1389-1403.

Hobbins, M. T.*, J. A. Ramírez, T. C. Brown and L.H.J.M. Claessens , 2001: The Complementary Relationship In The Estimation Of Regional Evapotranspiration: The CRAE And Advection-Aridity Models. Water Resources Research. Vol. 37(5), 1367-1387.

Molnár, P.* and J. A. Ramírez , 2001. Recent trends in precipitation and streamflow in the Rio Puerco Basin. Journal of Climate. Vol. 14, 2317-2328.

Lanza, L.G., Ramírez J.A., Todini E , 2001: Special Issue: Stochastic Rainfall Interpolation and Downscaling - Preface. EGS Hydrology and Earth System Sciences, Vol. 5(2): 137-137

Ramírez, J. A. and S. Senarath* , 2000: A Statistical-Dynamical Parameterization of Canopy Interception and Land Surface-Atmosphere Interactions. Journal of Climate. Vol. 13, 4050-4063.

Fiedler, F. R.*, And J. A. Ramírez , 2000. A Numerical Method for Hydrodynamic Modeling of Overland Flow. Intl. Jour. for Numerical Methods in Fluids. Vol. 32(2), 219-239.

Molnár, P* and J. A. Ramírez , 1998: Energy Dissipation Theories and Optimal Channel Characteristics of River Networks. Water Resources Research, 34(7), pp. 1809-1818.

Molnár, P* and J. A. Ramírez , 1998: An Analysis of Energy Expenditure and Downstream Hydraulic Geometry at Goodwin Creek. Water Resources Research, 34(7), pp. 1819-1829.

Sunantara, J. D.*, and J. A. Ramírez , 1997: Optimal Stochastic Multi-crop Seasonal and Intra-seasonal Irrigation Control. ASCE Journal of the Water Resources Planning and Management Division. 123(1) pp. 39-48.

Ramírez, J. A. and B. Finnerty* , 1996: CO2 and Temperature Effects on Evapotranspiration and Irrigated Agriculture. ASCE Journal of Irrigation and Drainage Division. 122(3), 155-163.

Ramírez, J. A. and B. Finnerty* , 1996: Precipitation and Water Table Effects on Agricultural Production and Economics. ASCE Journal of Irrigation and Drainage Division. 122(3), 164-171

Epstein, D.*, and J. A. Ramírez , 1994: Spatial Disaggregation for Studies of Climatic Hydrologic Sensitivity. ASCE Journal of the Hydraulics Division 120(12): 1449-1467.

Ramírez, J. A., R. Bras, and K. A. Emanuel , 1990: Stabilization Functions of Unforced Cumulus Clouds: Their Nature and Components. Journal of Geophysical Research, 95, D3.

Ramírez, J. A., and R. Bras , 1990: Clustered or Regular Cumulus Cloud Fields? The Statistical Character of Observed and Simulated Cloud Fields. Journal of Geophysical Research, 95, D3.

Ramírez, J. A., and R. Bras , 1985: Conditional Distributions of Neyman-Scott Models for Storm Arrivals and Their Use in Irrigation Scheduling, Water Resources Research, 21, 3.

Book Chapters

Salas, J.D., J.A. Ramírez, P Burlando, R. Pielke Sr., 2002: Stochastic Simulation Of Precipitation And Streamflow Processes. In Handbook of Weather, Climate and Water, Ed. Thomas D. Potter and Bradley R. Colman, John Wiley and Sons, 966 pp.

van de Giesen, N., L. J. Mata, P Doll, A. Hoekstra, M. Pfeffer, J. A. Ramírez, 2001: Modeling Water Availability: Scaling Issues. Chapter 16 in Understanding the Earth System: Compartments, Processes and Interactions. Eds. E. Ehlers and T. Krafft; Springer-Verlag.

Ramírez, J. A., 2000: Prediction and Modeling of Flood Hydrology and Hydraulics. Chapter 11 of Inland Flood Hazards: Human, Riparian and Aquatic Communities Eds. Ellen Wohl; Cambridge University Press; 293-329.

Ramírez, J. A., J. D. Salas, and R. Rosso, 1994: Determination of Flood Characteristics by Physically-Based Methods. Chapter 6 NATO Advanced Study Institute on Coping with Floods. Eds. Giuseppe Rossi, Nilgun Hamancioglu and Vujica Yevjevich; Kluwer Academic Publishers; pp. 77 - 110.

Books/Proceedings

Proceedings of the Thirty Second Annual American Geophysical Union Hydrology Days. Ed. Jorge A. Ramírez, Hydrology Days Publications, Ft. Collins, CO, March 21-March 23, 2012, 168 pp.

Proceedings of the Thirty First Annual American Geophysical Union Hydrology Days. Ed. Jorge A. Ramírez, Hydrology Days Publications, Ft. Collins, CO, March 21-March 23, 2011, 192 pp.

Proceedings of the Thirtieth Annual American Geophysical Union Hydrology Days. Ed. Jorge A. Ramírez, Hydrology Days Publications, Ft. Collins, CO, March 22-March 24, 2010, 157 pp.

Proceedings of the Twenty Ninth Annual American Geophysical Union Hydrology Days. Ed. Jorge A. Ramírez, Hydrology Days Publications, Ft. Collins, CO, March 25-March 27, 2009, 72 pp.

Proceedings of the Twenty Eighth Annual American Geophysical Union Hydrology Days. Ed. Jorge A. Ramírez, Hydrology Days Publications, Ft. Collins, CO, March 26-March 28, 2008, 144 pp.

Proceedings of the Twenty Seventh Annual American Geophysical Union Hydrology Days. Ed. Jorge A. Ramírez, Hydrology Days Publications, Ft. Collins, CO, March 19-March 21, 2007, 217 pp.

Proceedings of the Twenty Sixth Annual American Geophysical Union Hydrology Days. Ed. Jorge A. Ramírez, Hydrology Days Publications, Ft. Collins, CO, March 20-March 22, 2006, 184 pp.

Proceedings of the Twenty Fifth Annual American Geophysical Union Hydrology Days. Ed. Jorge A. Ramírez, Hydrology Days Publications, Ft. Collins, CO, March 7- Mar 9, 2005, 291 pp.

Proceedings of the Twenty Fourth Annual American Geophysical Union Hydrology Days. Ed. Jorge A. Ramírez, Hydrology Days Publications, Ft. Collins, CO, March 10- Mar 12, 2004, 272 pp. 

Proceedings of the Twenty Third Annual American Geophysical Union Hydrology Days. Ed. Jorge A. Ramírez, Hydrology Days Publications, Ft. Collins, CO, March 31-April 2, 2003, 235 pp. 

Proceedings of the Twenty Second Annual American Geophysical Union Hydrology Days. Ed. Jorge A. Ramírez, Hydrology Days Publications, Ft. Collins, CO, April 1-4, 2002, 355 pp.

Proceedings of the Twenty First Annual American Geophysical Union Hydrology Days. Ed. Jorge A. Ramírez, Hydrology Days Publications, Ft. Collins, CO, April 2-5, 2001, 277 pp.

Proceedings of the Twentieth Annual American Geophysical Union Hydrology Days. Ed. Jorge A. Ramírez, Hydrology Days Publications, Ft. Collins, CO, April 3-6, 2000. 227 pp.

Publications in Refereed Proceedings

Kochendorfer, J.P. * and Ramirez, J.A., 2008. Ecohydrological controls on vegetation density and evapotranspiration partitioning across the climatic gradients of the central United States. Hydrol. Earth Syst. Sci. Discuss., 5, 649–700.

Kochendorfer, J.P. * and Ramirez, J.A., 2008. Modeling the monthly mean soil water balance with a statistical-dynamical ecohydrology model as coupled to a two-component canopy model. Hydrol. Earth Syst. Sci. Discuss., 5, 579–648.

Hobbins, M.T.*, J.A. Ramirez, and T.C. Brown, 2004: Developing a Long-Term, High-Resolution, Continental-Scale, Spatially Distributed Time Series of Topographically Corrected Solar Radiation Proc. AGU Hydrology Days 2004, J.A. Ramírez (ed), Hydrology Days Publications, Fort Collins, CO., pp. 103-119.

Brown, N.,J. A. Ramírez, and E. Wohl 2003.Cellular Automata Models of Particle Interaction in Sediment Entrainment, Proc. AGU Hydrology Days 2003, J.A. Ramírez (ed), Hydrology Days Publications, Fort Collins, CO., pp. 24-32.

Kochendorfer, J. P. and J. A. Ramirez. Modeling the Continental-Scale Dynamics of the Coupled Land-Surface and Atmospheric Water Balances with a Stochastic Differential Equation. Proc. AGU Hydrology Days 2003, J.A. Ramírez (ed), Hydrology Days Publications, Ft. Collins, CO, pp. 207-218.

Molnar, P. and J. A. Ramírez, 2002. On Rivers and Randomness, Proc. AGU Hydrology Days 2002, J.A. Ramírez (ed), Hydrology Days Publications, Fort Collins, CO., 319 - 330.

Sima-Aree, S. and J. A. Ramírez, 2002. A New Land Surface Scheme For Studies Of Carbon Dioxide Budgets In The Pasoh Forest, Malaysia. Proc. AGU Hydrology Days 2002, J.A. Ramírez (ed), Hydrology Days Publications, Fort Collins, CO., 274 - 292.

Raff, D. A. and J. A. Ramírez, 2002. Physical, Mechanistic Hillslope Hydrology Model: Development and Applications, Proc. AGU Hydrology Days 2002, J.A. Ramírez (ed), Hydrology Days Publications, Fort Collins, CO., 224 - 232.

Kang, B. and J.A. Ramírez, 2002. Stochastic Space-Time Inversion Schemes for NEXRAD Precipiation, Proc. AGU Hydrology Days 2002, J.A. Ramírez (ed), Hydrology Days Publications, Fort Collins, CO., 164-174.

Kang, B. and J.A. Ramírez, 2002. Stochastic Space-Time Inversion Schemes for NEXRAD Precipiation, Proc. AGU Hydrology Days 2002, J.A. Ramírez (ed), Hydrology Days Publications, Fort Collins, CO., 164-174.

Kang, B. and J.A. Ramírez, 2001. Comparative Study of the Statistical Features of Random Cascade Models for Spatial Rainfall Downscaling, Third US- Korea Joint Workshop on Storm Scale and Mesoscale Weather Analysis and Prediction - February 2002, Boulder, CO.

Marin, S. and J.A. Ramírez, 2001. Modeling and Simulation of the Spatial and Temporal Response of Precipitation to El Niño/Southern Oscillation (ENSO) phenomenon – The Case of Western Colombia. Proc. AGU Hydrology Days 2001, J.A. Ramírez (ed), Hydrology Days Publications, Fort Collins, CO., 165-175.

Hobbins, M.T, J.A. Ramírez, and T.C. Brown, 2001 Trends In Regional Evapotranspiration Across The United States Under The Complementary Relationship Hypothesis. Proc. AGU Hydrology Days 2001, J.A. Ramírez (ed), Hydrology Days Publications, Fort Collins, CO., 106-121.

Molnar, P. and J.A. Ramirez, 2000: Analyzing the effects of climate variability and change on erosion in the American Southwest using a newly developed ephemeral channel erosion model. International Symposium on Gully Erosion under Global Change. April 16 – 19, 2000 - Catholic University of Leuven, Belgium.

Marin, S., J.A. Ramirez, B. Walko, and R. Pielke Sr., 2000: Using CSU’s Regional Atmospheric Modeling System To Simulate Seasonal and Daily Precipitation in Colombia. Regional Atmospheric Modeling System Workshop; Cook College – Rutgers University, New Jersey, 22-24 May, 2000..

Erskine, R.H., J.A. Ramírez, and T.R. Green, 2000, Identifying opportunities for investigating the effects of temperature on infiltration and implications for modelling the hydrologic response of watersheds. Proc. AGU Hydrology Days 2000, J.A. Ramírez (ed), Hydrology Days Publications, Fort Collins, CO., 76-90.

Marin, S. and J.A. Ramirez, 2000: Modeling and Simulation of Spatial and Temporal Precipitation Patterns in Coastal Mountainous Regions – The Case of Northwestern Colombia. European Geophysical Society. Plinius Conference on Mediterranean Storms. October 16-18, 2000. Siena, Italy (Invited Lecture).

Rivero, M.P. and J.A. Ramirez, 2000: Derivacion De Redes De Canales A Partir De Modelos Digitales De Elevacion Y Efecto Del Tamaño De La Celda En La Respuesta De Un Modelo Hidrologico Semi-Distribuido International Workshop On The Debris Flow Disaster Of December 1999 In Venezuela, Universidad Central, Caracas, Venezuela, Nov 27 – Dec 1, 2000.

Marin, S., J.A. Ramirez, and L. Jurado, 2000: Uso De Un Modelo Atmosferico De Simulación Regional Para Reproducir Eventos De Precipitacion En Una Cuenca Del Noreste Del Departamento De Antioquia (Colombia). CIER Argentinian Committee. Conference on Operational Hydrology, Salto Grande Argentina, 29-31 May, 2000.

Marin, S. and J.A. Ramirez: Using A Regional Atmospheric Modeling System To Simulate Seasonal Precipitation in Western Colombia. AGU Hydrology Days 2000, Ft. Collins, CO, 3-6 April, 2000.

Gray, M., K. Elder, K. Tonnessen, J. A. Ramírez, M. Laituri, R. Greenwood, Topographical mass balance determination of Teton Glacier, Wyoming, in 67th Annual Proceedings of the Western Snow Conference, April 19-22, 1999, Lake Tahoe, CA, 1999, p. 125-132.

Hobbins, M., J. A. Ramírez, and T. Brown. The Complementary Relationship in Regional Evapotranspiration: The CRAE Model and the Advection-Aridity Approach' 19th AGU Hydrology Days. Fort Collins, CO. August 1999, pp: 199- 212.

Kochendorfer, J. P., J. A. Ramírez, D. Dagvadorj, and G. Davaa, 1997: Climatic Trends over the Past Half-Century along the Forest-Steppe Ecotone in Mongolia and Some Concurrent Changes in Permafrost, Ecology and Hydrology. Proceedings AGU Hydrology Days, Fort Collins, CO, April 7-11, pp. 171-182.

Molnár, P. and J. A. Ramírez, 1997: Applying Energy Dissipation Theories to River Network Studies. In Management of Landscapes Disturbed by Channel Incision. Eds. Sam S. Y. Wang, Eddy J. Langendoen, and F. Douglas Shields, Jr. Univ. of Mississippi, 1134 pp.

Meng, H., J. A. Ramírez, J.D. Salas, and L. Ahuja, 1996: Scaling Analysis of Infiltration at R-5 Catchment. Invited Proceedings of the USDA-ARS Workshop on Real World Infiltration, Pingree Park, CO, July 22-25. CWRRI Information Series No. 86, pp. 239-240

Kochendorfer, J. P. and J. A. Ramírez, 1996: Integrated Hydrological/Ecological/Economic Modeling for Examining the Vulnerability of Water Resources to Climate Change. Proceedings, North American Water and Environment Congress ‘96 - ASCE, Chenchayya T. Bathala, (editor). New York, NA: ASCE, 978-0-7844-0166-8 or 0-7844-0166-7, pp. 2157-2162.

Ramírez, J. A. and S. Senarath, 1995: GCM Land Surface Hydrology Parameterizations - Incorporating a Stochastic Surface Interception Capacity Function. Proceedings Fifteenth Annual Hydrology Days, C.S.U., Fort Collins, March 31 - April 3; pp. 237 - 250.

Claessens, L. H., J. A. Ramírez, and T. Brown, 1995: Estimation of Areal Evapotranspiration - Evaluation of the Complementary Relationship Using Long Term Large Scale Water Budgets. Proceedings Fifteenth Annual Hydrology Days, C.S.U., Fort Collins, March 31 - April 3; pp. 1 - 16.

Ramírez, J. A. and A. M. Genovez, 1994: Land Surface/Atmosphere Interactions: Effects of Spatial Heterogeneity on Regional Climate. Proceedings Sixteenth Latin American Congress in Hydraulics, Santiago de Chile, CHILE, November 7 - 11.

Srivastava, D., and J. A. Ramírez, 1993: Sensitivity of Energy and Moisture Balance Components to Subgrid Scale Precipitation Variability for Central India. Proceedings International Conference on Hydrology and Water Resources, New Delhi, INDIA, December 20 - 22.

Epstein, D., and J. A. Ramírez, 1993: A Statistical Climate Inversion Scheme and its Application in Hydrologic Impact Assessment Studies Associated with Global Climate Variability. Proceedings Third International Symposium on Engineering Hydrology. ASCE Conference, San Francisco, C. Y. Kuo Ed., pp. 61-66.

Sunantara, J. D., and J. A. Ramírez, 1993: Stochastic Dynamic Programming for Multicrop Optimal Weekly Irrigation Scheduling. Proceedings Thirteenth Annual Hydrology Days, Fort Collins, April; pp. 351 - 363.

Ramírez, J. A., 1991: The Role of Atmosphere/Surface Interactions in Global and Regional Hydrologic Cycles. Invited Eleventh Annual Hydrology Days, C.S.U., Fort Collins, April 1-5; pp. 47 - 58.

Eltahir, E., J. A. Ramírez, and R. Bras, 1990: A Physically-Based, Space-Time Hydrologic Precipitation Model. Proceedings Eighth Conference on Hydrometeorology, Kananaskis Pk., Alta., Canada, October 22-26; pp. 93 - 98.

Reports - Other Publications

Molnár P., J. A. Ramírez, and J. D. Salas, 1995: Analysis of Operations of The Nile River System. Technical Report No. 6 - Computing Hydrology Laboratory, Hydrologic Science and Engineering Program, Civil Engineering Department, CSU, 64 pp.

Molnár P., J. D. Salas, and J. A. Ramírez, 1995: The Nile River System Streamflow Simulation Model. Technical Report No. 4 - Computing Hydrology Laboratory, Hydrologic Science and Engineering Program, Civil Engineering Department, CSU, 105 pp.

Ramírez, J. A., and R. Bras, 1989: Atmospheric Stabilization and the Distribution of Cumulus Clouds. Projects in Scientific Computing, Pittsburgh Supercomputing Center, March.

Ramírez, J. A., 1989: La distribución Espacial de la Estabilización Atmosférica Inducida por la Convección - La Hipótesis de Inhibición.  Publications Universidad Nacional de Colombia; 41 pp.

Ramírez, J. A., 1987: Cumulus Clouds: The Relationship Between Their Atmospheric Stabilization and Their Spatial Distribution., Ph.D. Thesis, M.I.T., Cambridge, MA, November; 429 pp.

Restrepo, F., J. A. Ramírez, and G. Rendón, 1986: Simulación de un Sistema Hidráulico con Diferentes Modelos Hidrológicos. Memorias Seminario sobre Hidrología con Enfasis en el Problema de la Información Escasa. Universidad Nacional, Medellín, March.

Ramírez, J. A., and R. Bras, 1982: Optimal Irrigation Control Using Stochastic Cluster Point Pro­cesses for Rainfall Modeling and Forecasting.' R. M. Parsons Lab. T. R. # 275, M.I.T., Cambridge, May; 197 pp.

Invited Presentations

Ramirez, J.A.: Thermodynamic and Moisture Recycling Feedbacks and their Impact on the Temporal Variability of Soil Moisture. Delft University of Technology, TU Delft, The Netherlands; Colloquium in Recent Advances in Water Resources, May 31, 2007. (Invited)

Ramirez, J.A.: The Complementary Relationship in Regional Evapotranspiration: Theory, Observations, and the Pan Evaporation Paradox. Delft University of Technology, TU Delft, The Netherlands; Colloquium in Recent Advances in Water Resources, May 31, 2007. (Invited)

Ramirez, J.A.: The Pan Evaporation Paradox, Global Warming, Global Dimming and The Complementary Relationship. Polytechnic University of Valencia, Valencia, Spain; May 18, 2007. (Invited)

Ramirez, J.A.: The impact of land atmosphere interactions on the temporal variability of soil moisture. Polytechnic University of Valencia, Valencia, Spain; May 18, 2007. (Invited)

Ramirez, J.A.: Soil textural and climatic controls on vegetation density and evapotranspiration partitioning in the Central United States. European Geosciences Union General Assembly, Vienna Austria, 15-20 April 2007. (Invited)

Ramirez, J.A.: Topographic, meteorologic, and canopy controls on the scaling characteristics of the spatial distribution of snow depth fields. European Geosciences Union General Assembly, Vienna Austria, 15-20 April 2007. (Invited)

Ramirez, J.A.: The Complementary Relationship in Regional Evapotranspiration: Theory, Observations, and the Pan Evaporation Paradox. Swiss Federal Institute of Technology, ETH Hönggerberg, Zurich; September 22, 2006. (Invited)

Ramirez, J.A.: The Complementary Relationship in Regional Evapotranspiration: Theory, Observations, and the Pan Evaporation Paradox. Seminar Series, Institute for Environmental Engineering, Swiss Federal Institute of Technology ETH, Zurich, Switzerland, 22 September, 2006. (Invited)

Ramirez, J.A.: The Pan Evaporation Paradox, Global Warming, Global Dimming and The Complementary Relationship. University of Medellin, Colombia, May 17, 2005 (Invited)

Ramirez, J.A.: The impact of land atmosphere interactions on the temporal variability of soil moisture. University of Medellin, Colombia, May 16, 2005. (Invited)

Ramirez, J.A.: A Precipitation Downscaling Methodology and its Use in the Assessment of the Hydrologic Effects of Climate Variability and Change. University of Medellin, Colombia, May 17, 2005 (Invited)

Ramirez, J.A.: The Response of Precipitation and Surface Hydrology to Tropical Macro-climate Forcing in Colombia.. University of Medellin, Colombia, May 16, 2005. (Invited)

Ramirez, J.A.: A Concept for a Long Term Hydrologic Observatory in the South Platte River Basin. AGU Fall Meeting, San Francisco, 13-17 December, 2004. (Invited)

Harvey, F., J.A. Ramirez, T.L. Thurow: The Platte River Hydrologic Observatory. AGU Fall Meeting, San Francisco, 13-17 December, 2004. (Invited)

Ramirez, J.A.: The Complementary Relationship in Regional Evaporation: Theory, Observations and Implications. Hydrologic Sciences and Water Resources Engineering Seminar Series, University of Colorado, Boulder, 27 October, 2004. (Invited)

Ramirez, J.A.: La Dinámica de las Sequías y su Relación con las Interacciones entre la Atmósfera y la Superficie Terrestre. International Seminar on Modeling and Analysis of Extreme Minimum Flows. School of Mines, National University of Colombia, 23-25 June, 2004; Medellín, Colombia. (Invited)

Ramirez, J.A.: Modelamiento de la Influencia del Macro-clima Tropical en la Precipitación y en la Respuesta Hidrológica en Colombia. International Seminar on Modeling and Analysis of Extreme Minimum Flows. School of Mines, National University of Colombia, 23-25 June, 2004; Medellín, Colombia. (Invited)

Ramirez, J.A.: The impact of land atmosphere interactions on the temporal variability of soil moisture. M.I.T., Civil Engineering Department Hydrology Seminar, April 22, 2004. (Invited)

Ramirez, J.A.: The impact of land atmosphere interactions on the temporal variability of soil moisture. 2nd CSU-Korea Alumni Symposium, Seoul, Korea, May, 2003. (Invited)

Ramirez, J.A.: A Precipitation Downscaling Methodology and its Use in the Assessment of the Hydrologic Effects of Climate Variability and Change. Korean Water Resources Corporation (KOWACO), Daejeon, Korea, May, 2003. (Invited)

Green, T.R., R. H. Erskine, A. Martinez, M R. Murphy, L R. Ahuja, J D. Salas and J A. Ramirez: Scaling Relationships Of Crop Yield And Soil Water Content In An Agricultural Field: Measurement And Topographic Analyses, MODSIM 2001: Scale Problems In Hydrologic Modelling And Measurement, Canberra, Australia, 10-13 December 2001. (Invited)

Ramirez, J. A., 2000: - Land Surface-Atmosphere Interactions - A New Statistical-Dynamical Parameterization of Canopy Interception. University of Bonn - ZEF, Bonn, Germany, October 9 - 10, 2000 (Invited Lecture).

Ramírez, J. A.: The Complementary Relationship In Estimation Of Regional Evapotranspiration: An Enhanced Advection-Aridity Model. Swiss Federal Institute of Technology ETH-Zurich, Zurich, Switzerland, October 12-14, 2000 (Invited Lecture).

Ramirez, J. A., 2000: An Analysis of Drought Dynamics over the South Central United States. Plinius Conference on Mediterranean Storms. October 16-18, 2000. Siena, Italy (Invited Lecture).

Ramirez, J. A., 1999: Dimensionality and Scaling in Hydrologic Modeling: Regional Evapotranspiration. International Conference on "Understanding the Earth System: Compartments, Processes and Interactions", German National Committee on Global Change Research, Bonn, Germany, November 24 - 26, 1999.

Ramirez, J. A., 1999: Scaling in Hydrology: the Issue of scaling Water Availability. International Conference on "Understanding the Earth System: Compartments, Processes and Interactions", German National Committee on Global Change Research, Bonn, Germany, November 24 - 26, 1999.

Ramirez, J. A., 1999: The Dynamics of Continental Scale Droughts. International Conference on "Understanding the Earth System: Compartments, Processes and Interactions", German National Committee on Global Change Research, Bonn, Germany, November 24 - 26, 1999.

Ramírez, J. A., 1998: Examining Regional Hydrologic Vulnerability to Climate Variability: A Hydrologic/Ecological Modeling Approach - 25th International Conference on Alpine Meteorology. September 14-19, Turin, Italy.

Epstein, D., and J. A. Ramírez, 1993: A Statistical Climate Inversion Scheme and its Application in Hydrologic Impact Assessment Studies Associated with Global Climate Variability. Invited, Third International Symposium on Engineering Hydrology. ASCE Conference, San Francisco.

Ramírez, J. A., 1992: Climate Variability: Issues and Problems in Regional Hydrologic Impact Assessment Studies. Invited Aspen Global Change Institute - The Coupled Climate System and Global Change. August 2 - 15, Aspen, CO.

Ramírez, J. A., 1991: One Dimensional Soil-Plant-Atmosphere Model: Sensitivity of Global Climate to Surface Hydrologic and Biospheric Processes. Invited American Geophysical Union Front Range Meeting, Boulder, February 11-12.

Ramírez, J. A., and R. Bras, 1986: Searching for Consistent and Stochastic Explanations of Clustering., Invited American Geophysical Union Chapman Con­ference on Mesoscale Precip­itation, Caracas, March.

Ramírez, J. A., and R. Bras, 1985: Ideas on the Parameterization of Stochastic Precipitation Models. Invited , American Geophysical Union Fall Meeting, San Francisco, December.

Other Conference Presentations

Molnar, P. And J A. Ramirez: Long-Term Sediment Dynamics And Patterns Of Channel Erosion In A Semiarid Basin: Investigating The Effects Of Spatial And Temporal Variability In Rainfall, EGS Meeting, Nice, 2002

Raff, D. A. and J. A. Ramirez, 2001: Channel Initiation, Drainage Density, and Channel Network Structure at the Hillslope Scale. AGU Chapman Conference on State-of-the-Art Hillslope Hydrology. Sunriver, OR, October 8-12, 2001

Molnar, P., J. A. Ramirez, and P. Burlando: Long-term sediment dynamics and patterns of channel erosion in a semiarid basin: Investigating the effects of spatial and temporal variability in rainfall. International Symposium on The Structure, Function and Management Implications of Fluvial Sedimentary Systems organized by the ICCE of IAHS and UNESCO in Alice Springs, Australia, on September 2-6, 2001 (Theme: Variability- Magnitude and frequency, controlling sedimentary systems). To be published in IAHS red book series.

Green, T.R., RH. Erskine, A. Martinez, M R. Murphy, L R. Ahuja, J D. Salas and J A. Ramirez,: Scaling Relationships Of Crop Yield And Soil Water Content In An Agricultural Field: Measurement And Topographic Analyses, MODSIM 2001: Scale Problems In Hydrologic Modelling And Measurement, Canberra, Australia, 10-13 December 2001. (Invited)

Erskine, R. H, T R. Green, and J A. Ramírez, 2001: Effects of digital elevation model resolution and accuracy on terrain analyses 2001 AGU Spring Meeting, May 29 – June 2, Boston, MA

Molnár, P. and J. A. Ramírez, 2000. Analyzing the effects of climate variability and change on erosion in the American Southwest using a newly developed ephemeral channel erosion model. International Symposium on Gully Erosion under Climate Change; Catholic University of Leuven, Belgium, April 16 - 19, 2000.

Hobbins, M., J. A. Ramírez, and T. Brown. Regional Evapotranspiration and the Complementary Relationship: A Comparison and Evaluation of the CRAE Model and the Advection-Aridity Approach' American Geophysical Union Spring Meeting, Boston, MA June 1999.

Kochendorfer, J. P. and J. A. Ramirez. 'An Analysis of Drought Dynamics over the South Central United States using a Stochastic Differential Equation Model'. American Geophysical Union Spring Meeting, Boston, MA June 1999.

Ramírez, J. A. and P. Molnár, 1997: Applying Energy Dissipation Thoeries to River Network Studies. Proceedings, Conference on Management of Landscapes Disturbed by Channel Incision, Oxford, MS, May 20-22.

Meng, H., J. A. Ramírez, J.D. Salas, and L. Ahuja, 1996: On the Scaling Characteristics of the Infiltration Process. American Geophysical Union Fall ‘96 Meeting, San Francisco , CA, December 15-19.

Claessens, L. H., and J. A. Ramírez, 1996: The Complementary Relationship in Regional Evapotranspiration: A Long-Term Large-Scale Assessment for Hydrological Modeling. Second International Scientific Conference on the Global Energy and Water Cycle, Washington, D.C., 17-21 June.

Molnár, P. and J. A. Ramírez, 1996: A Study of Energy Dissipation in a River Network ( Goodwin Creek, Mississippi). American Geophysical Union Spring ‘96 Meeting, Baltimore , MD, 20-24 May.

Kochendorfer, J. P. and J. A. Ramírez, 1995: Hydrologic Modeling for Adaptation and Mitigation Decisions about Climate Change Impacts to Water Resources in the Developing World. International Union of Geodesy and Geophysics, XXI General Assembly, Boulder, CO, July 2 - 14.

Ramírez, J. A. and S. Senarath, 1995: Sensitivity Analysis and Inter-Comparison of Global Hydrologic Cycles Obtained with Different Land Surface Parameterization Schemes. International Union of Geodesy and Geophysics, XXI General Assembly, Boulder, CO, July 2 - 14.

Ramírez, J. A., L. H. Claessens, and T. Brown, 1995: Regional Evapotranspiration and Bouchet’s Hypothesis - Large Scale Water Budgets for the U.S. International Union of Geodesy and Geophysics, XXI General Assembly, Boulder, CO, July 2 - 14.

Finnerty, B., and J. A. Ramírez, 1995: 'Impact Assessment Study of Climate Change on Evapotranspiration and Irrigated Agriculture in the San Luis Valley, Colorado', AWRA 31st Annual Conference and Symposia, Houston, TX, Nov.

Kochendorfer, J. P. and J. A. Ramírez, 1995: Analytical or Numerical Hydrologic Models for Climate Change Impact Assessment? Fifteenth Annual Hydrology Days, C.S.U., Fort Collins, March 31 - April 3.

Senarath, S. and J. A. Ramírez, 1995: Improvements of the Land Surface/Atmosphere Interaction Representation by Incorporating a Stochastic Surface Retention Capacity Function to Existing GCM Parameterizations. American Geophysical Union Front Range Meeting, Fort Collins, February 13-14.

Claessens, L. H., J. A. Ramírez, and T. Brown, 1995: Estimation of Areal Evapotranspiration: Evaluation of the Complementary Relationship Using Long-term, Large-Scale Water Budgets. American Geophysical Union Front Range Meeting, Fort Collins, February 13-14.

Finnerty, B., and J. A. Ramírez, 1994: 'Effects of Climate and Groundwater Variations on Soil Moisture and Irrigated Agriculture in the San Luis Valley, Colorado'. American Geophysical Union Front Range Meeting, Boulder, February 8 - 10.

Epstein, D., and J. A. Ramírez, 1993: A Daily Spatial Disaggregation Approach and its Application in Hydrologic Sensitivity Analysis of the Upper Rio Grande to Climate Variability. American Geophysical Union Front Range Meeting, Boulder, February 8 - 10.

Ramírez, J. A. and S.-H. Chou, 1993: Impact of Complex Land Surface Hydrology on the Development and Evolution of Mid-Latitude Synoptic Waves: Sensitivity Experiments. Conference on Hydrometeorology. American Meteorological Society Annual Meeting, Anaheim, CA.

Epstein, D., and J. A. Ramírez, 1992: Sensitivity of the Upper Rio Grande Basin to a Disaggregated Climate Change Scenario. Twelfth Annual Hydrology Days, C.S.U., Fort Collins, March 31 - April 3.

Fitzjarrald, D., J. A. Ramírez, and F. Robertson, 1990: Sensitivity of the CCM1 Model Climate to Surface Boundary Conditions. Proceedings, Third Workshop on Community Climate Model. NCAR/TN-351+PPR, 9-20 July.

Ramírez, J. A., R. Bras, and K. A. Emanuel; 1988: 'Unforced Atmospheric Convection and its Effects on the Spatial Distribution of Cumuli.' Conference on Mesoscale Precipitation, Modeling and Forecasting. Endicott House, Dedham, MA, September.

Ramírez, J. A., R. Bras, and K. A. Emanuel, 1988: The Spatial Distribution of Cumulus Clouds: Definition and Measurement of Stabi­lization Functions. American Geophysical Union Spring Meeting, Baltimore, May.

Ramírez, J. A., and R. Bras, 1982: Optimal Irrigation Control Using Cluster Stochastic Models for Rainfall. American Geophysical Union Spring Meeting, Philadelphia, May.