Self‐Acceleration and Instability of Gravity Wave Packets: 3. Three‐Dimensional Packet Propagation, Secondary Gravity Waves, Momentum Transport, and Transient Mean Forcing in Tidal Winds
Self‐Acceleration and Instability of Gravity Wave Packets: 3. Three‐Dimensional Packet Propagation, Secondary Gravity Waves, Momentum Transport, and Transient Mean Forcing in Tidal Winds
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DOI：
10.1029/2019jd030692
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发表时间：
2020-02
期刊：
影响因子：
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通讯作者：
D. Fritts;W. Dong;T. Lund;Scott A. Wieland;B. Laughman
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文献类型：
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作者：
D. Fritts;W. Dong;T. Lund;Scott A. Wieland;B. Laughman
董等人的研究成果。(2020)，https://doi.org/10.1029/2019JD030691)使用了一种新的可压缩模式来研究重力波的自加速动力学、不稳定性、二次重力波的产生以及二维重力波包的平均强迫。本文将自加速动力学的探索扩展到三维(3D)中的GW包，它传播到中间层和热层的潮汐风中。与2D包响应一样，3DGW自加速动力学被发现是显著的，包括3DGW相位失真、GW垂直传播停滞、局部不稳定性以及SGW和声波的产生。这里描述的其他3D响应包括潮汐风折射、局部化3D不稳定性、SGW传播不对称、相对于2D响应在较高海拔的SGW和声波响应减弱，以及可能对在更长时间尺度上运行的化学和微物理过程产生影响的瞬时、大尺度、3D平均响应的强迫。
Dong et al. (2020, https://doi.org/10.1029/2019JD030691) employed a new compressible model to examine gravity wave (GW) self‐acceleration dynamics, instabilities, secondary gravity wave (SGW) generation, and mean forcing for GW packets localized in two dimensions (2D). This paper extends the exploration of self‐acceleration dynamics to a GW packet localized in three dimensions (3D) propagating into tidal winds in the mesosphere and thermosphere. As in the 2D packet responses, 3D GW self‐acceleration dynamics are found to be significant and include 3D GW phase distortions, stalled GW vertical propagation, local instabilities, and SGW and acoustic wave generation. Additional 3D responses described here include refraction by tidal winds, localized 3D instabilities, asymmetric SGW propagation, reduced SGW and acoustic wave responses at higher altitudes relative to 2D responses, and forcing of transient, large‐scale, 3D mean responses that may have implications for chemical and microphysical processes operating on longer time scales.