Thermal effects of internal gravity waves in the Martian upper atmosphere
Thermal effects of internal gravity waves in the Martian upper atmosphere
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DOI：
10.1029/2012gl050852
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发表时间：
2012-03
影响因子：
5.2
通讯作者：
A. Medvedev;Erdal Yiğit
中科院分区：
文献类型：
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作者：
A. Medvedev;Erdal Yiğit
这是第一次，重力波引起的加热和冷却效应被完全和交互地纳入火星大气环流模型（GCM）。一个全面的GCM与实施光谱非线性重力波（GW）参数化的模拟显示显着的热效应的GW在中间层和低热层（MLT）之间的100和150公里。相应地，波致加热和冷却速率与近红外CO2加热和红外CO2冷却速率相当。考虑到GWs的热效应，模拟的MLT更冷，大部分冷却发生在中纬度和高纬度地区。在冬季半球，温度下降可超过45 K。较冷的模拟MLT是在一个很好的协议与SPICAM恒星掩星测量和火星奥德赛大气制动温度反演。我们的实验表明，全球变暖的热效应可能是一个关键的物理机制，在MLT在当代火星GCM失踪。
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 CO2 heating and IR CO2cooling, 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.