Possible Role of Hadley Circulation Strengthening in Interdecadal Intensification of Snowfalls Over Northeastern China Under Climate Change

Possible Role of Hadley Circulation Strengthening in Interdecadal Intensification of Snowfalls Over Northeastern China Under Climate Change
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气候变化下哈德来环流增强对中国东北地区降雪年代际强化的可能作用

DOI:
10.1002/2017jd027574
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发表时间:
2017-11
影响因子:
4.4
通讯作者:
Shi Ying
Shi Ying
中科院分区:
地球科学2区
文献类型:
--
作者:
Zhou Botao;Wang Zunya;Shi Ying

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本文揭示,气候变化背景下冬季哈德来环流的加强可能部分导致近几十年来中国东北地区降雪强度的年代际增加。这一假设得到了哈德利环流与亚太地区大气环流在年代际时间尺度上基于过程的联系的充分支持。冬季哈得来环流的加强与西伯利亚高压减弱、阿留申低压东移、东亚槽缩小以及中国东北地区盛行异常西南风相对应。这些大气状况削弱了东亚冬季风,导致中国东北部气温升高。由于气温升高导致局部蒸发增加,同时从太平洋输送更多的水蒸气,可以显着增加目标区域的大气水蒸气含量。与此同时,东北地区的气流上升也有所加强。这些都为强降雪的发生提供了有利的年代际背景,使得20世纪80年代以后东北地区降雪强度加剧。进一步分析表明,类环太平洋遥相关模式可能在连接哈得来环流加强信号和有利于中国东北地区降雪年代际强化的大气环流异常方面发挥着重要作用。
This article revealed that strengthening of winter Hadley circulation in the context of climate change may partially contribute to interdecadal increasing of snowfall intensity over northeastern China in recent decades. This hypothesis is well supported by the process‐based linkage between Hadley circulation and atmospheric circulations over the Asian‐Pacific region on the interdecadal time scale. The strengthening of winter Hadley circulation corresponds to a weakening of the Siberian high, an eastward shifting of the Aleutian low, a reduction of the East Asian trough, and anomalous southwesterly prevailing over northeastern China. These atmospheric situations weaken the East Asian winter monsoon and lead to an increase of air temperature over northeastern China. Increased local evaporation due to the increase of air temperature, concurrent with more water vapor transported from the Pacific Ocean, can significantly enhance atmospheric water vapor content in the target region. Meanwhile, the ascending of airflows is also strengthened over northeastern China. All of these provide favorable interdecadal backgrounds for the occurrence of intense snowfalls, and thus, snowfall intensity is intensified over northeastern China after the 1980s. Further analysis suggests that the circum‐Pacific‐like teleconnection pattern may play an important role in connecting Hadley circulation strengthening signal and atmospheric circulation anomalies favoring interdecadal intensification of snowfalls over northeastern China.
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