Gravity Wave Weakening During the 2019 Antarctic Stratospheric Sudden Warming
Gravity Wave Weakening During the 2019 Antarctic Stratospheric Sudden Warming
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DOI：
10.1029/2021gl092537
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发表时间：
2021-01
影响因子：
5.2
通讯作者：
Masaru Kogure;J. Yue;Huixin Liu
中科院分区：
文献类型：
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作者：
Masaru Kogure;J. Yue;Huixin Liu
2019年8月30日发生了一次罕见的南极平流层突然变暖(SSW)，是一次较小的变暖事件。我们利用两颗卫星测量(AIRS和CIPS)和再分析资料(GEOS-5 FP)研究了这次南极SSW事件前后重力波(GW)活动的变化。虽然西风为40-60ms−1，不能过滤纬向相速度较小的GW，但8月30日以后，安第斯山脉的GW活动减弱。安第斯山脉的这种下降很可能是由海浪饱和引起的。南极洲和南大洋的纬向平均GW活动也同样减少，纬向风减弱。纬向平均GW活动在9月8日前后进一步减少，与40公里纬向平均风的逆转相吻合。8月30日以后纬向平均GW活动的下降可能是由于风的过滤和极地夜间急流的破裂造成的。
A rare Antarctic stratospheric sudden warming (SSW) occurred on August 30, 2019, and was a minor warming event. We investigated variations in gravity wave (GW) activity before and after this Antarctic SSW event using two satellite measurements (AIRS and CIPS) and reanalysis data (GEOS‐5 FP). GW activity over the Andes decreased after August 30, although the westerly wind was 40–60 ms−1 and cannot filter out GWs with small zonal phase speed. This decline over the Andes was probably caused by wave saturation. Zonal mean GW activity over Antarctica and the Southern Ocean likewise decreased, with a weakening of zonal wind. The zonal mean GW activity further decreased around September 8 which coincided with a reversal of the zonal mean zonal wind at 40 km. The decline in the zonal mean GW activity after August 30 was probably caused by wind filtering and polar night jet breaking.