Enhancement of gravity wave activity observed during a major Southern Hemisphere stratospheric warming by CHAMP/GPS measurements
Enhancement of gravity wave activity observed during a major Southern Hemisphere stratospheric warming by CHAMP/GPS measurements
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DOI：
10.1029/2004gl019789
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发表时间：
2004-08
影响因子：
5.2
通讯作者：
M. Venkat Ratnam;T. Tsuda;C. Jacobi;Y. Aoyama
中科院分区：
文献类型：
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作者：
M. Venkat Ratnam;T. Tsuda;C. Jacobi;Y. Aoyama
利用CHAMP/GPS掩星测得的温度廓线，分析了2002年冬末春末南半球平流层突然变暖(SSW)期间重力波的活动，首次将极涡分裂为两部分。观测到的气温在15天内(9月15-30日)向极地快速移动，最高可达25-30K，30公里及以下的纬度梯度发生反转。在这段时间里，重力波能量(势能，Ep)比平时高了3倍。这种增强主要发生在冷涡边缘附近和冷涡外，而不是在冷涡内部。讨论了平流层变暖过程中重力波、行星波和平均环流的潜在相互作用。
Using temperature profiles measured by CHAMP/GPS occultations we analyzed the gravity wave activity during the major sudden stratospheric warming (SSW) occurred in the Southern Hemisphere (SH) in late winter/spring of 2002, which for the first time split the polar vortex into two parts. The observed temperatures show a rapid poleward moving increase with a maximum of about 25–30 K with respect to the undisturbed winter conditions, and a reversal of the latitudinal gradients at 30 km and below within 15 days (September 15–30). During this time gravity wave energy (potential energy, Ep) became 3 times higher than usual. This enhancement mostly occurred near the edge and outside the cold polar vortex, but not inside the vortex. We discuss the observed event with potential interaction of gravity waves, planetary waves and the mean circulation during the stratospheric warming.