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首页> 外文期刊>Journal of Climate >Summer High Temperature Extremes in Southeast China: Bonding with the El Nino-Southern Oscillation and East Asian Summer Monsoon Coupled System
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Summer High Temperature Extremes in Southeast China: Bonding with the El Nino-Southern Oscillation and East Asian Summer Monsoon Coupled System

机译：中国东南部的夏季极端高温：与厄尔尼诺-南方涛动和东亚夏季风耦合系统的结合

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摘要

This study investigates summer high temperature extremes (HTEs) in southeast China and their linkage with the El Nino-Southem Oscillation (ENSO) and atmospheric circulations in the East Asian summer monsoon (EASM). An interdecadal change in HTEs associated with the abrupt shift of the ENSO monsoon climate in the late 1980s is demonstrated. Before this interdecadal shift, the interannual variability of HTEs was linked mainly to temperature adjustments associated with the meridional displacement of the East Asian jet stream (EAJS), whereas after the shift HTEs were found to follow an ENSO cycle, which may be due to intensified and persistent ENSO activities, tropical Indian Ocean (TIO) warming, and changes in atmospheric teleconnections. Impacts of the EAJS, the South Asian high (SAH), and the western North Pacific subtropical high (WNPSH) on HTEs are further investigated based on empirical orthogonal function (EOF) analysis. It is found that mainly the first leading EOF mode with a homogeneous spatial pattern shows dominance before the interdecadal shift, whereas both of the first two leading EOF modes show dominance after the interdecadal shift. A possible mechanism of how HTEs in southeast China are linked to the EAJS, the SAH, and the WNPSH in the ENSO-monsoon coupled system is proposed.
机译：这项研究调查了中国东南部的夏季极端高温（HTE）及其与厄尔尼诺-南极涛动（ENSO）和东亚夏季风（EASM）的大气环流的联系。结果表明，1980年代后期，HTEs年代际变化与ENSO季风气候的突然变化有关。在年代际变化之前，HTEs的年际变化主要与与东亚急流的经向位移相关的温度调节有关，而在这种变化之后，HTEs遵循ENSO周期，这可能是由于加剧以及ENSO持续活动，热带印度洋（TIO）变暖以及大气遥相关的变化。基于经验正交函数（EOF）分析，进一步研究了EAJS，南亚高压（SAH）和北太平洋副热带高压西部（WNPSH）对HTE的影响。发现主要是具有均匀空间模式的第一个前导EOF模式在年代际偏移之前表现出优势，而前两个前EOF模式在年代际偏移之后都表现出优势。提出了在ENSO-季风耦合系统中，中国东南部的HTE如何与EAJS，SAH和WNPSH联系的可能机制。

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