On the lack of southern hemisphere polar mesosphere summer echoes
On the lack of southern hemisphere polar mesosphere summer echoes
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论南半球极地中间层夏季回声的缺失
DOI：
10.1029/95jd00510
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发表时间：
1995
影响因子：
--
通讯作者：
A. Giraldez
中科院分区：
文献类型：
--
作者：
B. Balsley;R. Woodman;M. Sarango;Richard Rodriguez;J. Urbina;E. Ragaini;J. Carey;M. Huaman;A. Giraldez
我们报告的VHF雷达观测南部高纬度中层顶区风廓线，最近安装在国王乔治岛，南极洲，和乌斯怀亚，阿根廷。简单地说，我们在1993年1月和2月进行的观测表明，几乎没有所谓的极地中间层夏季回波（PMSE）的证据。由于这些回波是夏季北方高纬度中间层的主要特征，南半球没有这些回波既令人惊讶又令人感兴趣。在本文中，我们提出的证据表明，虚拟的回声的情况下，并证明我们的系统能够检测到他们，如果他们存在。我们还概述了这个有趣的结果，这是由观测到的两极中间层云，中间层温度，高层大气重力波活动，平均环流模式的半球差异支持的一些后果。
We report VHF radar observations of the southern high-latitude mesopause region using wind profilers that were installed recently on King George Island, Antarctica, and Ushuaia, Argentina. Briefly, our observations, which were made during January and February 1993, show almost no evidence of so-called polar mesosphere summer echoes, or PMSE. Since these echoes are a predominant feature of the northern high-latitude mesosphere in summer, their absence in the southern hemisphere is both surprising and intriguing. In this paper we present evidence demonstrating the virtual absence of the echoes and demonstrate that our systems were capable of detecting them had they been present. We also outline some of the consequences of this intriguing result, which are supported by observed hemispheric differences in polar mesospheric clouds, mesospheric temperatures, upper atmospheric gravity wave activity, and mean circulation patterns.