用MAVEN/NGIMS观测和用重力波方案模拟的火星热层中的高空重力波
High-altitude gravity waves in the Martian thermosphere observed by MAVEN/NGIMS and modeled by a gravity wave scheme
摘要：
首次对火星热大气层中重力波引起的CO $_2$密度扰动进行高空观测，这些观测是从MAVEN卫星上的NASA NGIMS仪器中检索到的，并使用Yiadhit等人[2008]的扩展重力波参数化和火星气候数据库作为输入进行解释。在180-220公里之间观测到的20- 40%的相对密度扰动表明了当地时间、纬度和高度的明显变化。MAVEN观测的时空条件的建模表明，GWs可以直接从低层大气传播到热层，产生明显的动力学效应，并可能有助于观察到的波动。模拟的影响比观察到的要小一些，但其高度可变的性质与观察结果在质量上是一致的。建模和测量之间的差异可能的原因进行了讨论。
英文摘要：
First high-altitude observations of gravity wave (GW)-induced CO$_2$ density perturbations in the Martian thermosphere retrieved from NASA's NGIMS instrument on board the MAVEN satellite are presented and interpreted using the extended GW parameterization of Yiğit et al. [2008] and the Mars Climate Database as an input. Observed relative density perturbations between 180-220 km of 20-40 % demonstrate appreciable local time, latitude, and altitude variations. Modeling for the spatiotemporal conditions of the MAVEN observations suggests that GWs can directly propagate from the lower atmosphere to the thermosphere, produce appreciable dynamical effects, and likely contribute to the observed fluctuations. Modeled effects are somewhat smaller than the observed but their highly variable nature is in qualitative agreement with observations. Possible reasons for discrepancies between modeling and measurements are discussed.
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