Signature of latitudinal coupling during a major sudden stratospheric warming in the tropics

被引:10
作者
Guharay, A. [1 ]
Sekar, R. [1 ]
机构
[1] Phys Res Lab, Ahmadabad 380009, Gujarat, India
关键词
Sudden stratospheric warming; Lidar observations; Latitudinal coupling; Waves; LIDAR OBSERVATIONS; MIDDLE ATMOSPHERE; PLANETARY-WAVES; NORTHERN-HEMISPHERE; TEMPERATURE; WINTER; CIRCULATION; STRATOPAUSE; MESOSPHERE;
D O I
10.1016/j.jastp.2011.06.010
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A major sudden stratospheric warming (SSW) in lidar temperature is observed during late February, 2007 from a tropical station, Gadanki (13.5 degrees N, 79.2 degrees E). Latitudinal coupling through dynamical parameters during the warming period has been studied using ECMWF and NCEP reanalysis data, which has revealed appreciable alteration of the lower stratosphere in response with the abrupt forcing. Sufficient air mass transport from low to high latitude has been observed during the event which indicates possible heat transmission to fuel the heating at polar region. On starting from high latitude, enhanced planetary wave amplitude reaches at sufficiently low latitude during the event and reverts back hereafter. Gravity wave activity increases at later phase of the warming episode and continues for a couple of days at high latitude. A dynamical incitement occurs a couple of weeks preceding the SSW suspected to excite the event. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:122 / 126
页数:5
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