【作者】 周洋； 鹿有余； 江静；

【Author】 Yang Zhou~1 Youyu Lu~2 and Jing Jiang~1 (1.School of Atmospheric Sciences,Nanjing University,Nanjing 210093,P.R.China 2.Bedford Institute of Oceanography,Department of Fisheries and Oceans,Dartmouth, NS,B2Y 4A2,Canada)

【机构】 南京大学大气科学学院； Bedford Institute of Oceanography,Department of Fisheries and Oceans,Dartmouth,NS B2Y 4A2,Canada；

【摘要】 本文通过分析1979年至2008年北半球冬季海平面气压(SLP)资料寻找海平面气压的季节内变化与MJO之间的关系。本文发现SLP异常在不同MJO位相下的合成在热带和热带以外的一些地区显著地不等于零。通过线性统计分析,我们发现MJO的强度与SLP异常在低纬度地区(30°S～30°N)有显著的相关;在热带以外地区两者的同时及时滞相关则不显著。在热带以外的地区,通过MJO指数回归的SLP只能解释5%的SLP方差变化。分析结果表明,热带以外地区的SLP变化对MJO的强度变化是不敏感的,但在一些地区的SLP却对MJO的位相变化是敏感的。更多还原

【Abstract】 The relationship between intra-seasonal variations of the sea level pressure(SLP ) and Madden-Julian Oscillation(MJO) is examined through analyzing the atmospheric reanalysis data during 1979-2008,with a focus on the boreal winter.The composites of SLP anomalies in different MJO phases are"significantly different from zero"in tropics and some extratropical regions.Linear statistical analyses reveal significant relationship between the MJO magnitude and the SLP variations at low latitudes between 30°S and 30°N.In the extratropical regions,in each MJO phase there is no significant correlation between the MJO amplitude and the SLP variations at the lags of 0-3 pentads;the regression of the SLP variations to the MJO index can explain only less than 5%of the variance of the SLP.Finally,in the extratropical regions no significant relationship can be identified by applying spectral analysis to all the continuous time series during the 30-year period.更多还原