徐海明,何金海,董敏. 2001. 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[J]. 气象学报, 59(6):694-706, doi:10.11676/qxxb2001.073 |
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 |
投稿时间:1999-03-10 修订日期:2011-01-10 |
DOI:10.11676/qxxb2001.073 |
中文关键词: 江淮入梅 年际变化 北大洋涛动 海温异常 |
英文关键词:Meiyu onset,Interannual variability,NAO,SST A |
基金项目:国家自然科学基金49735170、"我国重大天气灾害的形成机理和预测理论研究"(G1998040908);中国气象局气候研究开放实验室(97-6LCS-04) |
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中文摘要: |
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。 |
英文摘要: |
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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