Global Gravity Wave Variances from Aura MLS: Characteristics and Interpretation
Global Gravity Wave Variances from Aura MLS: Characteristics and Interpretation
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DOI：
10.1175/2008jas2489.1
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发表时间：
2008-12
期刊：
影响因子：
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通讯作者：
Dong L. Wu;S. Eckermann
中科院分区：
文献类型：
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作者：
Dong L. Wu;S. Eckermann
摘要研究了Aura卫星上的微波临边探测器（MLS）对平流层118 GHz饱和热辐射的重力波（GW）分辨能力，并给出了初步结果。由于饱和（光学厚）辐射解决GW扰动从一个给定的高度在不同的水平位置，方差进行评估，在12个压力高度之间的10.21和51公里，使用40个饱和辐射在底部的每个肢体扫描。正演模拟表明，这些变化主要受垂直波长λz > 5 km和水平沿航迹波长λy <100-200 km的全球Ws控制。倾斜的雪茄形状的三维加权函数产生高度选择性的响应，向仪器传播的高固有频率的GW。后一个属性是用来推断GW传播的净谐波分量的差异，从上升（A）和下降（D）的…
Abstract The gravity wave (GW)–resolving capabilities of 118-GHz saturated thermal radiances acquired throughout the stratosphere by the Microwave Limb Sounder (MLS) on the Aura satellite are investigated and initial results presented. Because the saturated (optically thick) radiances resolve GW perturbations from a given altitude at different horizontal locations, variances are evaluated at 12 pressure altitudes between ∼21 and 51 km using the 40 saturated radiances found at the bottom of each limb scan. Forward modeling simulations show that these variances are controlled mostly by GWs with vertical wavelengths λz > 5 km and horizontal along-track wavelengths of λy ∼ 100–200 km. The tilted cigar-shaped three-dimensional weighting functions yield highly selective responses to GWs of high intrinsic frequency that propagate toward the instrument. The latter property is used to infer the net meridional component of GW propagation by differencing the variances acquired from ascending (A) and descending (D) o...