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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

Journal article
Authors W. W. Wang
W. Zhou
Deliang Chen
Published in Journal of Climate
Volume 27
Issue 11
Pages 4122-4138
ISSN 0894-8755
Publication year 2014
Published at Department of Earth Sciences
Pages 4122-4138
Language en
Links dx.doi.org/10.1175/jcli-d-13-00545....
Subject categories Meteorology and Atmospheric Sciences

Abstract

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.

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