中国海洋大学学报（自然科学版）2011，Vol.41Issue(4)：19-27,9.
北太平洋热带辐合带区上升运动的季节和年际变化特征
The Seasonal and Interannual Features of Ascending Motion Intensity and Position in the Intertropical Convergence Zone in the North Pacific
摘要
Abstract
The omega data and sea surface wind data from NCEP/NCAR reanalysis data during 1979 to 2007 were used to investigate the vertical distribution characters of ITCZω intensity and the position in theNorth Pacific and their seasonal and interannual features.The results show that in long-term average the strongest intensity of ITCZω in the Western (Eastern) Pacific is on the top (bottom) of troposphere and the weakest one is on the bottom (top).The most northern position in the Western Pacific is almost the same as each other on three levels.In the eastern Pacific the most northern (southern) position is on the top (bottom).The strongest intensity in the Western (Eastern) Pacific is in August (August and September) and the most northern position is in September.The weakest intensity and the most southern position are in February (February and March).In the Eastern Pacific the intensity is also weaker in November.The time that ITCZω intensity reaches to the strongest (weakest) corresponds to the rapid northward (southward) shift of position.When the position is more northern (southern), the intensity is stronger (weaker).And there are changes in position ahead of that in intensity.By Empirical Orthogonal Function analyses(EOF) for climatic data and anomaly data, it is found that the first mode of climate data is the basic meteorological state of ascending motion with quasi-semiannual cycle and the second mode is the seasonal position fluctuation of ITCZω.The first mode of anomaly data is east-west dipole mode and in an 4.8year cycle by spectrum analysis of the time series.The intensity of ITCZω in the Western Pacific is weaker (stronger) in Elnino (Lanina) years.The position of ITCZω in the Eastern Pacific is more southern (northern) than normal years in Elnino (Lanina) years.In general, ENSO has great influence on the position in the Eastern Pacific and the intensity in the western Pacific.关键词
北太平洋/ITCZ区/上升运动/垂直结构/ENSOKey words
the North Pacific/ ITCZ/ ascending motion/ vertical structure/ ENSO分类
海洋科学引用本文复制引用
隋晓霞,王启..北太平洋热带辐合带区上升运动的季节和年际变化特征[J].中国海洋大学学报（自然科学版）,2011,41(4):19-27,9.基金项目
国家自然科学基金项目(40876004,40890150/D0601) （40876004,40890150/D0601）
国家基础科学研究项目(2007CB411801,2005CB422301)资助 （2007CB411801,2005CB422301）
