Do minor sudden stratospheric warmings in the Southern Hemisphere (SH) impact coupling between stratosphere and mesosphere-lower thermosphere (MLT) like major warmings?

被引：15

作者：

Eswaraiah, S. ^{[1
]}

Kim, Yong Ha ^{[1
]}

Liu, Huixin ^{[2
]}

Ratnam, M. Venkat ^{[3
]}

Lee, Jaewook ^{[1
]}

机构：

[1] Chungnam Natl Univ, Dept Astron Space Sci & Geol, Daejeon, South Korea

[2] Kyushu Univ, Dept Earth & Planetary Sci, Fukuoka, Japan

[3] Natl Atmospher Res Lab, Tirupati, Andhra Prades, India

来源：

EARTH PLANETS AND SPACE | 2017年 / 69卷

关键词：

Sudden stratospheric warming (SSW); Mesosphere and lower thermosphere (MLT); Meteor radar; Stratosphere-MLT coupling; GAIA simulations; MLT dynamics; PLANETARY-WAVES; MIDDLE; EVENT; MODEL;

D O I：

10.1186/s40623-017-0704-5

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We have investigated the coupling between the stratosphere and mesosphere-lower thermosphere (MLT) in the Southern Hemisphere (SH) during 2010 minor sudden stratospheric warmings (SSWs). Three episodic SSWs were noticed in 2010. Mesospheric zonal winds between 82 and 92 km obtained from King Sejong Station (62.22 degrees S, 58.78 degrees W) meteor radar showed the significant difference from usual trend. The zonal wind reversal in the mesosphere is noticed a week before the associated SSW similar to 2002 major SSW. The mesosphere wind reversal is also noticed in "Specified Dynamics" version of Whole Atmosphere Community Climate Model (SD-WACCM) and Ground-to-topside model of Atmosphere and Ionosphere for Aeronomy (GAIA) simulations. The similar zonal wind weakening/reversal in the lower thermosphere between 100 and 140 km is simulated by GAIA. Further, we observed the mesospheric cooling in consistency with SSWs using Microwave Limb Sounder data. However, the GAIA simulations showed warming between 130 and 140 km after few days of SSW. Thus, the observation and model simulation indicate for the first time that the 2010 minor SSW also affects dynamics of the MLT region over SH in a manner similar to 2002 major SSW.

引用

页数：8

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