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Graduate Exam Abstract


Jia Yue

Ph.D. Preliminary

February 8, 2008, 2 pm - 4 pm

Engineering B101

Combined Active and Passive Optical Remote Sensing of Atmospheric Gravity Waves: Evidence of Direct Dynamic and Energetic Coupling between Weather in the troposphere and the Mesosphere and Lower Thermosphere


Abstract: Atmospheric internal gravity (buoyancy) waves result from the balance between the forces of buoyancy and gravity on air parcels in the stably stratified atmosphere. Gravity waves are induced mostly by topography, convection and wind shear in the troposphere. These waves transport energy and momentum upward vertically from the tropopause to the Mesosphere and Lower Thermosphere (MLT) region. They also play an important role in mesospheric transport circulation, leading to seasonal temperature and wind variations in the MLT region. The Kyoto University OH imager near Fort Collins measures the horizontal structure of gravity waves at the altitude of 875 km with horizontal wavelengths from approximately 10-100 km. The state-of-the-art CSU sodium fluorescence lidar system measures the temperature and wind at altitudes from 80 to 105 km during 500-1000 hours every year. The combination of lidar and OH imagery can provides coupled joint observations of convectively-generated atmospheric gravity waves and ducted gravity waves in the mesopause, with the potential to advance the science of mesopause region dynamics.

Adviser: Chiao-Yao (Joe) She
Co-Adviser: Steven C. Reising
Non-ECE Member: David Krueger, Physics
Member 3: Steven C. Reising, ECE
Addional Members: NA

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