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Thermal effects of internal gravity waves in the Martian upper atmosphere
Author(s) -
Medvedev Alexander S.,
Yiğit Erdal
Publication year - 2012
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2012gl050852
Subject(s) - martian , thermosphere , atmosphere of mars , gravity wave , atmospheric sciences , atmosphere (unit) , mars exploration program , northern hemisphere , thermal , mesosphere , environmental science , gravitational wave , geophysics , physics , astrobiology , meteorology , ionosphere , astrophysics , stratosphere
For the first time, gravity wave‐induced heating and cooling effects were fully and interactively incorporated into a Martian general circulation model (GCM). Simulations with a comprehensive GCM with an implemented spectral nonlinear gravity wave (GW) parameterization revealed significant thermal effects of GWs in the mesosphere and lower thermosphere (MLT) between 100 and 150 km. Wave‐induced heating and cooling rates are comparable with those due to near‐IR CO 2 heating and IR CO 2 cooling, correspondingly. Accounting for thermal effects of GWs results in a colder simulated MLT, with the most of cooling taking place in middle‐ and high‐latitudes. In the winter hemisphere, the temperature decrease can exceed 45 K. The colder simulated MLT is in a good agreement with the SPICAM stellar occultation measurements and Mars Odyssey aerobraking temperature retrievals. Our experiments suggest that thermal effects of GWs are probably a key physical mechanism in the MLT missing in contemporary Martian GCMs.