Opposite annular responses of the Northern and Southern hemispheres to Indian ocean warming.
Opposite annular responses of the Northern and Southern hemispheres to Indian ocean warming.
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DOI：
10.1175/2010jcli3410.1
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发表时间：
2010-07
影响因子：
4.9
通讯作者：
Shuanglin Li;J. Perlwitz;M. Hoerling;Xiaoting Chen
中科院分区：
文献类型：
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作者：
Shuanglin Li;J. Perlwitz;M. Hoerling;Xiaoting Chen
世纪后半叶冬季大气环流的变化表现为北方半球环形模（NAM）和南半球环形模（SAM）均向正极性发展的趋势。这与气候系统中的其他趋势，特别是印度洋的变暖是一致的。这项研究探讨了热带印度洋变暖是否在迫使这些环形趋势中发挥了作用。用5种不同的大气环流模式（AGCMs）对印度洋海温异常（SSTA）进行了理想化的、短暂的增温模拟，结果表明，增温对北半球的环形趋势有贡献，但对南半球的环形趋势有抵消作用。后者的结果意味着，印度洋变暖可能已经部分抵消了平流层臭氧消耗对南极地区的影响，这本身就迫使SAM的正相位的趋势。身体诊断.
Abstract Atmospheric circulation changes during boreal winter of the second half of the twentieth century exhibit a trend toward the positive polarity of both the Northern Hemisphere annular mode (NAM) and the Southern Hemisphere annular mode (SAM). This has occurred in concert with other trends in the climate system, most notably a warming of the Indian Ocean. This study explores whether the tropical Indian Ocean warming played a role in forcing these annular trends. Five different atmospheric general circulation models (AGCMs) are forced with an idealized, transient warming of Indian Ocean sea surface temperature anomalies (SSTA); the results of this indicate that the warming contributed to the annular trend in the NH but offset the annular trend in SH. The latter result implies that the Indian Ocean warming may have partly cancelled the influence of the stratospheric ozone depletion over the southern polar area, which itself forced a trend toward the positive phase of the SAM. Diagnosis of the physical...