The large‐scale dynamics of the mesosphere–lower thermosphere during the Southern Hemisphere stratospheric warming of 2002
The large‐scale dynamics of the mesosphere–lower thermosphere during the Southern Hemisphere stratospheric warming of 2002
复制标题
DOI：
10.1029/2004gl020282
复制
发表时间：
2004-07
影响因子：
5.2
通讯作者：
A. Dowdy;R. Vincent;D. Murphy;M. Tsutsumi;D. Riggin;M. Jarvis
中科院分区：
文献类型：
--
作者：
A. Dowdy;R. Vincent;D. Murphy;M. Tsutsumi;D. Riggin;M. Jarvis
2002年南极冬季出现了前所未有的平流层变暖。我们介绍了位于戴维斯（69°S，78°E），Syowa（69 ° S，40°E）和Rothera（68°S，68°W）的MF雷达对中间层-低热层（MLT）风的测量。由于整个冬季行星波活动增加，2002年的中层风场与其他年份有很大不同。在2002年冬季和向夏季环流过渡期间，纬向风比正常要弱。MLT纬向风的反转比平流层的反转早一周左右。经向风的振荡与行波1行星波的存在一致，周期为14天。结果进行了比较，类似的中层观测期间北方平流层变暖。发现了半球之间的一些相似之处，特别是中间层风的逆转先于变暖事件。
An unprecedented major stratospheric warming occurred in the Antarctic winter of 2002. We present measurements of winds in the mesosphere‐lower thermosphere (MLT) made with MF radars located at Davis (69°S, 78°E), Syowa (69°S, 40°E) and Rothera (68°S, 68°W). The mesospheric wind field in 2002 was found to be considerably different to other years due to increased planetary wave activity throughout the winter. Zonal winds were weaker than usual during the 2002 winter and also during the transition to the summer circulation. The MLT zonal winds showed a reversal about one week earlier than the stratospheric reversal associated with the warming. Meridional winds showed oscillations consistent with the presence of traveling wave‐1 planetary waves with periods ∼14 days. The results are compared with similar mesospheric observations made during northern hemisphere stratospheric warmings. Some similarities between hemispheres were found, notably that the reversal in the mesospheric winds precedes the warming events.