Connection between Anomalous Zonal Activities of the South Asian High and Eurasian Summer Climate Anomalies

Connection between Anomalous Zonal Activities of the South Asian High and Eurasian Summer Climate Anomalies
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南亚高压异常纬向活动与欧亚夏季气候异常的联系

DOI:
10.1175/jcli-d-15-0823.1
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发表时间:
2016-11
期刊:
影响因子:
4.9
通讯作者:
Qian Weihong
Qian Weihong
中科院分区:
地球科学2区
文献类型:
--
作者:
Shi Jian;Qian Weihong

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本文利用NCEP再分析1(NCEP R1)资料,分析了南亚高压(SAH)纬向异常活动与欧亚大陆北半球夏季气候异常的关系。方差分析确定了两个主要的域与更大的位势高度变异位于东部和西部侧翼的南亚高压在100和150百帕左右,分别。对于东部和西部区域,极端事件选择在1981-2014年期间,当归一化高度异常至少连续10天大于1.0(小于-1.0)标准差时。在此基础上,定义了强、弱西藏模式(STM和WTM)和强、弱伊朗模式(SIM和WIM)等4种南亚高压模式,以描述南亚高压的纬向特征。东(西)域的正合成表明,STM(SIM)在150 hPa有一个异常低压,表现出较强的波浪型,并在150 hPa附近有一个异常低压。
AbstractUsing the daily mean anomalies of atmospheric variables from the NCEP Reanalysis-1 (NCEP R1), this study reveals the connection between anomalous zonal activities of the South Asian high (SAH) and Eurasian climate anomalies in boreal summer. An analysis of variance identifies two major domains with larger geopotential height variability located in the eastern and western flanks of the SAH at around 100 and 150 hPa, respectively. For both eastern and western domains, extreme events are selected during 1981–2014 when normalized height anomalies are greater than 1.0 (less than −1.0) standard deviation for at least 10 consecutive days. Based on these events, four SAH modes that include strong and weak Tibetan modes (STM and WTM, respectively) and strong and weak Iranian modes (SIM and WIM, respectively) are defined to depict the zonal SAH features. The positive composite in the eastern (western) domain indicates the STM (SIM) manifests a robust wavelike pattern with an anomalous low at 150 hPa, and su...
DOI: 10.1175/jcli-d-14-00682.1
发表时间: 2015
期刊: Journal of Climate
影响因子: 4.9
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