Anthropogenic influence on Northern Hemisphere blocking during the winter 1960/1961–2012/2013

Anthropogenic influence on Northern Hemisphere blocking during the winter 1960/1961–2012/2013
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1960/1961 年至 2012/2013 年冬季北半球阻塞的人为影响

DOI:
10.1088/1748-9326/ac1d0e
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发表时间:
2021
影响因子:
6.7
通讯作者:
Guolin Feng
Guolin Feng
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Dong Chen;Shaobo Qiao;Xian Zhu;Ho-Nam Cheung;Nicolas Freychet;Xin Hao;Shankai Tang;Guolin Feng

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摘要。北半球(NH)的大气阻塞(“阻塞”)是冬季极端寒冷期的关键驱动因素。本文利用HadGEM3-GA6-N216模拟,研究了1960/1961-2012/2013年冬季人类活动对NH阻塞的影响及其对地表气温(SAT)的影响,这些模拟有15个组成部分:(a)有人为和自然强迫(All-hist), (b)只有自然强迫(Nat-hist)。与全历史运动相比,全历史运动的阻塞频率在欧洲-大西洋、乌拉尔和西太平洋减少,而在东太平洋和格陵兰岛增加。这些响应可以用行星波和风暴轨迹的响应来解释。另一方面,全历史运行阻塞区下游的SAT下降比新历史运行更明显,特别是在欧洲和乌拉尔地区。相应的,在所有阻塞天数中,这些扇区的寒冷天数比例在历史运行中高于非历史运行。这些反应可以用与阻塞相关的风反应来解释。总体而言,阻塞的时空特征对于评估阻塞对极端天气的影响至关重要,其对人为强迫的响应应通过更多的模式进行研究。
Abstract. Atmospheric blocking (‘blocking’) in the Northern Hemisphere (NH) is a crucial driver of extreme cold spells in winter. Here we investigate the anthropogenic influence on the NH blocking and its impact on surface air temperature (SAT) during the winter 1960/1961–2012/2013 using two HadGEM3-GA6-N216 simulations with 15 ensemble members: (a) with anthropogenic and natural forcing (All-hist) and (b) with natural forcing only (Nat-hist). Compared to the Nat-hist run, the blocking frequency in the All-hist run decreases in the Euro-Atlantic, the Urals and the western Pacific, whereas it increases in the eastern Pacific and Greenland. These responses can be explained by the response of planetary waves and storm tracks. On the other hand, the decrease in SAT downstream of the blocking regions in the All-hist run is more pronounced than the Nat-hist run, especially in Europe and the Urals. Correspondingly, the proportion of cold days during all blocking days in these sectors is higher in the All-hist run than the Nat-hist run. These responses can be explained by the wind response associated with blocking. Overall, the spatiotemporal characteristics of blocking is crucial for evaluating the impact of blocking on extreme weather, and their response to anthropogenic forcing should be investigated by more models.
欧洲和加拿大次季节到季节模型对2012年1月乌拉尔强阻塞事件的预测
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发表时间: 2020-05
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影响因子: 2.9
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