Composite Analysis of the Effects of ENSO Events on Antarctica

Composite Analysis of the Effects of ENSO Events on Antarctica
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ENSO事件对南极洲影响的综合分析

DOI:
10.1175/jcli-d-15-0108.1
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发表时间:
2016
期刊:
影响因子:
4.9
通讯作者:
Hitchman, Matthew H.
Hitchman, Matthew H.
中科院分区:
地球科学2区
文献类型:
--
作者:
Welhouse, Lee J.;Lazzara, Matthew A.;Keller, Linda M.;Tripoli, Gregory J.;Hitchman, Matthew H.

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以前对厄尔尼诺-南方涛动(ENSO)和南极气候之间关系的研究主要集中在受厄尔尼诺和拉尼娜影响的地区,这有利于对阿蒙森海和别林斯高晋海(ABS)进行分析。在这里,35年(1979-2013年)的欧洲中期天气预报中心中期再分析(ERA-Interim)数据进行了分析,以调查ENSO和南极洲之间的关系,每个季节使用的合成方法,包括9个厄尔尼诺和9个拉尼娜时期。分别计算了厄尔尼诺负中性和拉尼娜负中性条件下2 m温度(T2 m)、海平面气压(SLP)、500 hPa高度场、海表温度(SST)和300 hPa高度场距平的合成,分析了ENSO各阶段的特征。这些异常模式可能在重要方面不同于厄尔尼诺减去拉尼娜的复合模式,这可能是从热带深对流的地理变化和相关的行星波传播到南半球的模式中预期的。主要的新结果是拉尼娜现象期间南极洲东部冷却的强烈信号。这种冷却是从12月到8月。南方环形模式(SAM)和这种冷却之间的联系进行了探讨。厄尔尼诺和拉尼娜现象在南方秋季的信号最弱。拉尼娜现象的峰值信号出现在南方的夏季,而厄尔尼诺现象的峰值出现在南方的春季。
Previous investigations of the relationship between El Niño–Southern Oscillation (ENSO) and the Antarctic climate have focused on regions that are impacted by both El Niño and La Niña, which favors analysis over the Amundsen and Bellingshausen Seas (ABS). Here, 35 yr (1979–2013) of European Centre for Medium-Range Weather Forecasts interim reanalysis (ERA-Interim) data are analyzed to investigate the relationship between ENSO and Antarctica for each season using a compositing method that includes nine El Niño and nine La Niña periods. Composites of 2-m temperature (T2m), sea level pressure (SLP), 500-hPa geopotential height, sea surface temperatures (SST), and 300-hPa geopotential height anomalies were calculated separately for El Niño minus neutral and La Niña minus neutral conditions, to provide an analysis of features associated with each phase of ENSO. These anomaly patterns can differ in important ways from El Niño minus La Niña composites, which may be expected from the geographical shift in tropical deep convection and associated pattern of planetary wave propagation into the Southern Hemisphere. The primary new result is the robust signal, during La Niña, of cooling over East Antarctica. This cooling is found from December to August. The link between the southern annular mode (SAM) and this cooling is explored. Both El Niño and La Niña experience the weakest signal during austral autumn. The peak signal for La Niña occurs during austral summer, while El Niño is found to peak during austral spring.
DOI: 10.1002/joc.965
发表时间: 2004-01
期刊: International Journal of Climatology
影响因子: --
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发表时间: 2010
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DOI: 10.1175/bams-d-11-00015.1
发表时间: 2012-10-01
影响因子: 8
作者:
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