摘要
基于NCEP/NCAR再分析资料,分析西北太平洋热带辐合区上升运动(ITCZω)与越赤道气流和澳大利亚高压之间的关系,并给出了三者在2003、2007年淮河流域强降水的异常特征。结果表明越赤道气流对西北太平洋ITCZω的影响主要反映在对其强度的影响,对其位置的影响不明显。总体上来说,925 h Pa上各支越赤道气流强度与西北太平洋ITCZω强度的相关性都要好于850 h Pa;ITCZω强度与澳大利亚高压强度的相关只在对流层低层可以通过95%的信度检验。2003、2007年淮河流域强降水期间,90°E及以东的越赤道气流偏弱;澳大利亚高压强度也偏弱;对应ITCZω偏弱、偏南;2003、2007年90°E、105°E、150°E附近越赤道气流的强度较多年平均都要偏弱,2007年125°E附近越赤道气流的强度较多年平均也较弱;2007年ITCZω偏弱的程度要大于2003年;2007年南半球冷空气偏弱持续的时间虽然长于2003年,但偏弱的程度却小于2003年。
Based on NCEP/NCAR reanalysis data,the relationships between the ascending motion in Intertropical Convergence Zone(ITCZw)and cross-equatorial flow andAustralian High have been investigated,in addition,the anomalous features of cross-equatorial flow,Australian High and ITCZw are revealed in2003and2007,corresponding to flood years in the Huaihe River Basin.The main results are as follows:The cross-equatorial flow mainly has more important effects on the intensity of ITCZw than the position.Generally,the correlation coefficient between the cross-equatorial flow and the intensity of ITCZw at925hPa is larger than that at850hPa.During the flood years in2003and2007over Huaihe River Basin,the cross-equatorial flows in east of90°E and90°E were weaker and Australian High also was weaker,corresponding to weaker and further south ITCZw.There were differences among these factors between2003and2007.The crossequatorial flow near125°E was also weaker than normal years.ITCZw in2007was weaker than that in2003and the cold air from the Southern Hemisphere in2003was weaker than that in2007although it lasted more time.
作者
隋晓霞
武冰路
SUI Xiaoxia;WU Binglu(CMA Training Center Hebei Branch,Baoding 071000,China)
出处
《沙漠与绿洲气象》
2017年第4期54-61,共8页
Desert and Oasis Meteorology
基金
河北省科技厅计划项目(15274204D)资助
关键词
西北太平洋
热带辐合区上升运动
越赤道气流
澳大利亚高压
淮河流域强降水
the Northwest Pacific
ascending motion in the region of ITCZ
cross-equatorial flow
Australian High
flood in Huaihe River Basin
