江淮入梅的年际变化及其与北大西洋涛动和海温异常的联系
INTERANNUAL VARIABILITY OF THE MEIYU ONSET AND ITS ASSOCIATION WITH NORTH ATLANTIC OSCILLATION AND SSTA OVER NORTH ATLATIC
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摘要: 文中首先采用简单相关和合成分析的方法研究了江淮入梅的年际变化与前期冬季环流和前期冬、春全球海温的关系。研究结果表明江淮入梅的早晚与前期冬季北半球大型环流存在显著的相关:入梅早的年份,其前期冬季北大西洋涛动强,北半球只有一个强的极涡并位于格陵兰上空,东亚大槽弱;入梅晚的年份,则其前期冬季环流表现为,北大西洋涛动弱,北半球存在两个极涡,其中一个仍然位于格陵兰上空,而另一个则位于西伯利亚上空,东亚大槽较常年强。江淮入梅的年际变化与前期冬春北大西洋海温的相关分析表明:入梅早的年份,北大西洋海温较常年偏暖;入梅晚的年份,前期冬春北大西洋海温较常年偏冷。文中还用CCM3模拟了冬、春季北大西洋海温增暖对后期江淮入梅和梅雨期降水的影响,并探讨了其影响的物理机制。Abstract: In the context of simplecor relation and composite analysis,study is performed of the correlation bet ween Meiyu onset dates(MOD) and at mospheric cir culation in the previous winter.Result shows that the MOD is significantly related to the at mospheric features in the previous winter with strong North Atlantic Oscillation (NAO) for early Meiyu onset and v.v..Resul talso indicates that there exists pronounced correlation between the MOD and SST over the North Atlantic in the previous winter-to-spring with positive SST anomalies for early Meiyu onset and negative anomalies for late Meiyu onset,which implies important significance for Meiyu onset prediction.Finally,numerical simulation is taken to investig ate the mechanism of effects on the Meiyu onset and precipitation of the warm sea surface temperature over the North Atlantic.
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陶诗言,徐淑英.夏季江淮流域持续性旱涝现象的环流特征.气象学报,1962,32(1):1～10 杨广基等.长江流域中下游持久性旱涝与低纬度热带环流型的关系.高原气象,1982,1(3):43～50 陶诗言,朱文妹等.论梅雨的年际变化.大气科学,1988,12(特刊):2～13 黄荣辉,李维京.夏季热带西太平洋上空的热源异常对东亚上空副热带高压的影响及其物理机制.大气科学,1988,12(特刊):107～116 Nitta T.Long-ter mvariations of cloud amount in the wes tern Pacific region.J Meteor Soc Japan.1986,64:373～390
陈烈庭.东太平洋赤道地区海水温度异常对热带大气环流及中国汛期降水的影响.大气科学,1977,1(1):1～12 符崇斌.中国夏季的气候异常与埃尔尼诺南方涛动的关系.大气科学,1988,12(特刊):133～141 徐群.八十年长江中下游的梅雨.气象学报,1965,35(4):507～518 孙淑清,孙柏民.东亚冬季风环流异常与中国江淮流域夏季旱涝天气的关系.气象学报,1995,53(4):440～450 Wallace J M,Gulzter D S.Teleconnection in the geopotential height field during the Northern Hem isphere winter.Mon Wea Rev,1981,109:784～812
王绍武,胡增臻.气象要素相关场显著性检验的统计模拟方法.见:王绍武,黄朝迎编.长江黄河旱涝灾害发生规律及其经济影响的诊断研究.北京:气象出版社,1993,215～221 Kiehl J T,Hack J J,Bon an G A,et al.Des cription of the NCAR Community Climate Model(CCM 3).NCAR Tech.Note,1996,NCAR/TN-420+STR,152pp
Kiehl J T,Hack J J,Bon an G A,et al.The National center for at mospheric research community climate model:CCM 3.J Clim at e,1998,11,1131～1150
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