Interpretation of recent Southern Hemisphere climate change
Interpretation of recent Southern Hemisphere climate change
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DOI：
10.1126/science.1069270
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发表时间：
2002-05-03
期刊：
影响因子：
56.9
通讯作者：
Solomon, S
中科院分区：
文献类型：
--
作者：
Thompson, DWJ;Solomon, S
南半球高纬度地区的气候变率主要受南半球环形模态的控制，这是一种以绕极涡强度波动为特征的大尺度变率。我们目前的证据表明，在SH对流层环流的最新趋势可以解释为偏向高指数极性的这种模式，与较强的西风气流环绕极冠。有人认为，对流层最大和最重要的趋势可以追溯到最近平流层下部极涡的趋势，这主要是由于光化学臭氧损失。在夏秋季节，更强的绕极气流的趋势大大有助于观察到的南极半岛和巴塔哥尼亚的变暖和南极洲东部和南极高原的冷却。
Climate variability in the high-latitude Southern Hemisphere (SH) is dominated by the SH annular mode, a large-scale pattern of variability characterized by fluctuations in the strength of the circumpolar vortex. We present evidence that recent trends in the SH tropospheric circulation can be interpreted as a bias toward the high-index polarity of this pattern, with stronger westerly flow encircling the polar cap. It is argued that the largest and most significant tropospheric trends can be traced to recent trends in the lower stratospheric polar vortex, which are due largely to photochemical ozone losses. During the summer-fall season, the trend toward stronger circumpolar flow has contributed substantially to the observed warming over the Antarctic Peninsula and Patagonia and to the cooling over eastern Antarctica and the Antarctic plateau.