Asian Origin of Interannual Variations of Summer Climate over the Extratropical North Atlantic Ocean
Asian Origin of Interannual Variations of Summer Climate over the Extratropical North Atlantic Ocean
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DOI：
10.1175/jcli-d-11-00617.1
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发表时间：
2012-04
影响因子：
4.9
通讯作者：
P. Zhao;Song Yang;R. Wu;Z. Wen;Junming Chen;Huijun Wang
中科院分区：
文献类型：
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作者：
P. Zhao;Song Yang;R. Wu;Z. Wen;Junming Chen;Huijun Wang
本文分析了亚洲对流层温度与北大西洋夏季（5 - 9月）海表温度（SST）的年际关系，并讨论了东亚-欧亚地区大气环流的相关特征。当亚洲地区对流层温度高（低）时，北大西洋对流层外海温出现正（负）异常。这种关系得到了背景大气环流和海气陆热力过程变化的有力支持。当亚洲地区陆面向大气的热量输送加强时，对流层温度升高，正温度异常从亚洲向西传播到北大西洋，导致南极-欧亚地区夏季对流层温度升高。与此相应，北大西洋热带外洋面上出现一个深异常高压脊，西太平洋洋面上出现低层偏南异常。
AbstractThe authors have identified an interannual relationship between Asian tropospheric temperature and the North Atlantic Ocean sea surface temperature (SST) during summer (May–September) and discussed the associated features of atmospheric circulation over the Atlantic–Eurasian region. When tropospheric temperature is high (low) over Asia, positive (negative) SST anomalies appear in the extratropical North Atlantic. This relationship is well supported by the changes in background atmospheric circulation and ocean–atmosphere–land thermodynamic processes. When heat transfer from the land surface to the atmosphere over Asia strengthens, local tropospheric temperature increases and positive temperature anomalies propagate westward from Asia to the North Atlantic, leading to an increase in summer tropospheric temperature over the Atlantic–Eurasian region. Accordingly, a deep anomalous ridge occurs over the extratropical North Atlantic Ocean, with low-level southerly anomalies over the western portion of t...