How do gravity waves triggered by a typhoon propagate from the troposphere to the upper atmosphere?
How do gravity waves triggered by a typhoon propagate from the troposphere to the upper atmosphere?
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DOI：
10.5194/acp-22-12077-2022
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发表时间：
2022-09
影响因子：
6.3
通讯作者：
Qinzeng Li;Jiyao Xu;Han L. Liu;Xiao Liu;W. Yuan
中科院分区：
文献类型：
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作者：
Qinzeng Li;Jiyao Xu;Han L. Liu;Xiao Liu;W. Yuan
抽象。重力波对大气动力学、光化学以及对流层、平流层、中间层和热层之间的耦合有着重要的影响。此外，对流层的强烈扰动（如雷暴和台风）产生的全球Ws可以影响地球从对流层到热层的大气层。然而，GW从对流层到热层的传播的基本过程知之甚少，因为它是具有挑战性的，以约束这一过程中使用的观测。此外，由于分子扩散随高度呈指数增加，GWs在热层中易于迅速消散。在这项研究中，一个双层气辉网络被用来捕获中国上空的同心GWs（CGWs），由台风查巴（2016）激发。利用ERA 5再分析资料和多功能运输卫星-1R的观测资料，定量描述了台风生成的CGW从对流层、平流层、中间层到热层的传播过程。结果表明，对流层中层顶的CGW是由台风直接产生的。然而，后向射线追踪分析表明，CGW在热层起源于二次波产生的CGW的耗散和/或在中层顶区域的非线性过程。
Abstract. Gravity waves (GWs) strongly affect atmospheric dynamics and photochemistry and the coupling between the troposphere, stratosphere, mesosphere, and thermosphere. In addition, GWs generated by strong disturbances in the troposphere (e.g. thunderstorms and typhoons) can affect the atmosphere of Earth from the troposphere to the thermosphere. However, the fundamental process of GW propagation from the troposphere to the thermosphere is poorly understood because it is challenging to constrain this process using observations. Moreover, GWs tend to dissipate rapidly in the thermosphere because the molecular diffusion increases exponentially with height. In this study, a double-layer airglow network was used to capture concentric GWs (CGWs) over China that were excited by Typhoon Chaba (2016). We used ERA5 reanalysis data and Multi-functional Transport Satellite-1R observations to quantitatively describe the propagation processes of typhoon-generated CGWs from the troposphere, through the stratosphere and mesosphere, to the thermosphere. We found that the CGWs in the mesopause region were generated directly by the typhoon in the troposphere. However, the backward-ray-tracing analysis suggested that CGWs in the thermosphere originated from the secondary waves generated by the dissipation of the CGW and/or nonlinear processes in the mesopause region.