A mechanism to explain the variations of tropopause and tropopause inversion layer in the Arctic region during a sudden tratospheric warming in 2009
A mechanism to explain the variations of tropopause and tropopause inversion layer in the Arctic region during a sudden tratospheric warming in 2009
复制标题
解释2009年平流层突然变暖期间北极地区对流层顶和对流层顶逆温层变化的机制
DOI：
10.1002/2016jd024958
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Yoshihiro Tomikawa
中科院分区：
文献类型：
--
作者：
Wang Rui;Yoshihiro Tomikawa
利用研究与应用再分析资料和GPS/星座气象、电离层和气候观测系统（COSMIC）温度资料，研究了2009年北极地区平流层突然变暖（SSW）期间对流层顶和对流层顶逆温层（TIL）变化的解释机制。在2009年突出的南纬风暴期间，由于波数为2的行星波（wave2），气旋系统转变为反气旋系统。GPS/COSMIC温度资料显示，2009年SSW期间，北极对流层顶高度下降，对流层顶温度升高，TIL增强。对流层顶和TIL在高纬度地区变化较大。静稳定性分析表明，对流层顶和TIL的变化与西南副风引起的剩余环流和静稳定性的变化有关。平流层上层出现较大的静态稳定性，并向下移动到对流层顶上方的狭窄区域。强下行气流在高纬度地区下降速度较快。静稳定性趋势分析表明，强的向下残余气流引起了平流层和对流层顶周围的静稳定性变化。平流层强下沉主要是由波2引起的，由于绝热加热导致对流层顶高度和温度的变化。在对流层顶附近，由于波2的作用，对流层顶以上的一对下降流和对流层顶以下的一对上升流增强了南纬压后TIL的静态稳定性。
The mechanism to explain the variations of tropopause and tropopause inversion layer (TIL) in the Arctic region during a sudden stratospheric warming (SSW) in 2009 was studied with the Modern‐Era Retrospective analysis for Research and Applications reanalysis data and GPS/Constellation Observing system for Meteorology, Ionosphere, and Climate (COSMIC) temperature data. During the prominent SSW in 2009, the cyclonic system changed to the anticyclonic system due to the planetary wave with wave number 2 (wave2). The GPS/COSMIC temperature data showed that during the SSW in 2009, the tropopause height in the Arctic decreased accompanied with the tropopause temperature increase and the TIL enhancement. The variations of the tropopause and TIL were larger in higher latitudes. A static stability analysis showed that the variations of the tropopause and TIL were associated with the variations of the residual circulation and the static stability due to the SSW. Larger static stability appeared in the upper stratosphere and moved downward to the narrow region just above the tropopause. The descent of strong downward flow was faster in higher latitudes. The static stability tendency analysis showed that the strong downward residual flow induced the static stability change in the stratosphere and around the tropopause. The strong downwelling in the stratosphere was mainly induced by wave2, which led to the tropopause height and temperature changes due to the adiabatic heating. Around the tropopause, a pair of downwelling above the tropopause and upwelling below the tropopause due to wave2 contributed to the enhancement of static stability in the TIL immediately after the SSW.