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利用NCEP-NCAR再分析位势高度、风矢量、海表面热通量数据,HadSST1再分析海温资料、CPC逐月北大西洋涛动(NAO)指数等,通过滞后回归分析了北大西洋海温异常对NAO的影响。结果显示,夏秋季北大西洋马蹄型海温通过海洋-大气相互作用导致冬季大气呈现NAO型气压场特征;与此同时,秋季大气场表现出反位相的NAO型环流形势突变,ECHAM4大气环流模型数值试验和观测资料统计分析均发现:热带大西洋海温异常(对流异常)可激发向中高纬度传播的遥相关波列,且具有秋季锁相的特征。马蹄型海温对大气的局地强迫联合热带大西洋异常海温的遥相关作用使得秋季NAO完成一次正负位相转换。
Abstract：Using NCEP-NCAR reanalysis of geopotential height,wind,surface heat flux,HadSST1 SST,CPC North Atlantic Oscillation(NAO)index,impacts of North Atlantic SST anomalies on NAO have been analyzed through regression analysis.The autumn North Atlantic Horseshoe(NAH)SST pattern reproduces negative NAO pattern in winter through ocean-atmosphere interaction.A positive NAO pattern change occurs in autumn,ECHAM4 model experiments and observation data illustrate that warmer tropical Atlantic SST forces a teleconnection wave train and remotely reverses the negative NAO phase to positive.The mechanism analysis indicates its seasonal lock nature,further suggests that combined effects of NAH and tropical Atlantic SST make a phase change cycle of NAO.
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基本信息:
DOI：10.16441/j.cnki.hdxb.20160051
中图分类号:P732.6
引用信息:
[1]梅笑冬,孙即霖,孙雅文.基于遥相关的NAO位相转换影响机理研究分析[J],2017,47(01):7-16.DOI:10.16441/j.cnki.hdxb.20160051.
基金信息:
国家自然科学基金项目(41276012);; 国家自然科学重点基金项目(41430963)资助~~
2016-03-01
2016
2016-04-20
2016-12-14
2016
1