Decadal variability of summer extreme heat in central-eastern China and its synergistic effects by the North Atlantic and tropical western Pacific SST

IF 8.5 1区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

npj Climate and Atmospheric Science Pub Date : 2025-05-27 DOI:10.1038/s41612-025-01092-y

Tiejun Xie, Hui Gao, Ting Ding, Xintong Chen, Wei Wang

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Abstract

It was found that the Central-eastern China’s summer extreme heat (CECSH) has a decadal variability with a cycle of about 70 years and is significantly positively correlated with the Atlantic Multidecadal Oscillation (AMO) core area sea surface temperature (SST; AMO_CORE) and the tropical western Pacific SST (WPSST) in boreal summer. Diagnostic analyses such as synergistic diagnostic and linear baroclinic model (LBM) experiments show that the warm AMO_CORE and WPSST in boreal summer can generate the localized heat dome (HD) over Mongolia to northeast China by exciting local convection and subsequent propagation, respectively, which in turn directly influences the CECSH decadal variability through compression of the atmosphere and temperature transport. The empirical models of the CECSH decadal variability were constructed based on the AMO_CORE or the WPSST separately and synergistically considering both, and the empirical model considering the synergistic effects of the AMO_CORE and the WPSST had better simulation capability.

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中国中东部夏季极端高温的年代际变化及其北大西洋和热带西太平洋海温的协同效应

结果表明：中国中东部夏季极端高温（CECSH）具有70年左右的年代际变率，与大西洋多年代际涛动（AMO）核心区海表温度（SST）显著正相关；北半球夏季的热带西太平洋海温（WPSST）和AMOCORE。协同诊断和线性斜压模式（LBM）试验等诊断分析表明，夏季偏暖的AMOCORE和WPSST分别通过激发局地对流及其传播在蒙古至东北地区产生局地热穹（HD），进而通过大气压缩和温度输送直接影响CECSH年代际变率。分别基于AMOCORE和WPSST构建了CECSH年代际变率的经验模型，并将两者协同考虑，考虑AMOCORE和WPSST协同效应的经验模型具有更好的模拟能力。

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来源期刊

npj Climate and Atmospheric Science Earth and Planetary Sciences-Atmospheric Science

CiteScore

8.80

自引率

3.30%

发文量

审稿时长

21 weeks

期刊介绍： npj Climate and Atmospheric Science is an open-access journal encompassing the relevant physical, chemical, and biological aspects of atmospheric and climate science. The journal places particular emphasis on regional studies that unveil new insights into specific localities, including examinations of local atmospheric composition, such as aerosols. The range of topics covered by the journal includes climate dynamics, climate variability, weather and climate prediction, climate change, ocean dynamics, weather extremes, air pollution, atmospheric chemistry (including aerosols), the hydrological cycle, and atmosphere–ocean and atmosphere–land interactions. The journal welcomes studies employing a diverse array of methods, including numerical and statistical modeling, the development and application of in situ observational techniques, remote sensing, and the development or evaluation of new reanalyses.