西天山春季极端高温事件的年代际变化及其与热带SST的关系

IF 2.1 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Liyun Ma, Ping Chen, Junqiang Yao, Jinggao Hu, Weiyi Mao
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引用次数: 0

摘要

本研究进行了观测分析,以检验中国西天山春季极端高温事件频率的年代际变化,其特征是1983-1996年(2000-2005年)极端高温事件相对较少(较多)。综合分析表明,肠出血性大肠杆菌的年代际增加与伊朗深层动力异常高压密切相关。在这一高压系统的控制下,西天山地区的水汽含量下降,大气环流以下降运动为主。两者都归因于云层覆盖减少,导致云层迫使净太阳辐射增加。到达表面的短波辐射通量和显热通量增加,净表面热通量累积增加,有利于表面温度升高和EHE的发生。造成ECE发生的异常伊朗高压与大西洋和印度洋-太平洋上空的海气相互作用有关。热带西太平洋和西印度洋之间的纬向海面温度差直接增强了沃克环流,从而增强了伊朗高压。此外,伊朗异常高压还受到中纬度大气波列的影响,这是由大西洋SST的温暖异常引发的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interdecadal Variation of Spring Extreme High-Temperature Events in the Western Tianshan Mountains and Its Relationship with the Tropical SST
This study performed an observational analysis to examine the interdecadal variation in the frequency of extreme high-temperature events (EHEs) during spring over the western Tianshan mountain, China, which were characterized by relatively fewer (more) EHEs during 1983–1996 (2000–2015). A composite analysis indicated that the interdecadal increase in EHEs is closely related to a deep dynamic anomalous Iranian high. Under the control of this high system, the water vapor content decreased over the western Tianshan mountains, and atmospheric circulation was dominated by a descending motion. Both were attributed to the decreased cloud cover, inducing a cloud-forced net solar radiation increase. The short-wave radiation flux and sensible heat flux reaching the surface increased, and the net surface heat flux increased cumulatively, which was conducive to the surface temperature increase and EHE occurrence. The anomalous Iranian high responsible for ECEs occurrence was related to the air-sea interaction over the Atlantic and Indo-Pacific. The latitudinal sea surface temperature (SST) difference between the tropical western Pacific and the western Indian Ocean directly strengthens the Walker circulation and thus enhances the Iranian high. In addition, the anomalous Iranian high was affected by the atmospheric wave trains at middle latitude, which was triggered by the warm anomaly of the Atlantic SST.
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来源期刊
Advances in Meteorology
Advances in Meteorology 地学天文-气象与大气科学
CiteScore
5.30
自引率
3.40%
发文量
80
审稿时长
>12 weeks
期刊介绍: Advances in Meteorology is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles in all areas of meteorology and climatology. Topics covered include, but are not limited to, forecasting techniques and applications, meteorological modeling, data analysis, atmospheric chemistry and physics, climate change, satellite meteorology, marine meteorology, and forest meteorology.
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