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| 1998年长江流域夏季降水异常的一个物理机制 | |
| 引用本文： | 陶云,赵荻,杨明.1998年长江流域夏季降水异常的一个物理机制[J].热带气象学报,2007,23(1):41-46. |
| 作者姓名： | 陶云 赵荻 杨明 |
| 作者单位： | 1. 云南省气候中心,云南,昆明,650034;云南大学大气科学系,云南,昆明,650091 2. 云南大学大气科学系,云南,昆明,650091 3. 云南省气象台,云南,昆明,650034 |
| 摘 要： | 2005年春末夏初云南出现了55年来最严重的高温干旱天气。通过诊断分析发现,造成此异常气候主要原因是中高层大气环流季节转换滞后,冷空气活动偏北;南海夏季风爆发偏晚;热带对流偏弱;西太平洋副高偏南、偏强、偏西。 |
| 关 键 词： | 云南 高温干旱 南海季风 副热带高压 热带对流 |
| 文章编号： | 1004-4965(2007)01-0035-06 |
| 收稿时间： | 2005/9/12 0:00:00 |
| 修稿时间： | 2005-09-12 |
A POSSIBLE MECHANISM FOR THE ABNORMAL SUMMER RAINFALL OVER YANGTZE RIVER VALLEY IN 1998 |
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| TAO Yun,ZHAO Di and YANG Ming.A POSSIBLE MECHANISM FOR THE ABNORMAL SUMMER RAINFALL OVER YANGTZE RIVER VALLEY IN 1998[J].Journal of Tropical Meteorology,2007,23(1):41-46. | |
| Authors: | TAO Yun ZHAO Di and YANG Ming |
| Institution: | 1. Climate Center of Yunnan, Kunming 650034, China; 2. Meteorological Science and Technology Services Center of Yunnan, Kunming 650034, China; 3. Department of Atmospheric Science, Yunnan university, Kunming 650091, China; 4. China Meteorological Adminis |
| Abstract: | Based on observed height data,three-set spatial waves mainly describing the characteristics on the North Hemispheric 500 hPa height field of June,July and August in 1998 were obtained with 2-dimension spatial spectrum analysis method.There were 15 waves in each set.Based on the three-set spatial spectrum functions,a possible mechanism for the abnormal summer rainfall over Yangtze River valley in 1998 was obtained with the Galerkin method.The mechanism indicated that forced by a special sea surface temperature anomaly distribution which belonged to the El Niño pattern before May,then to the decreasing El Niño pattern,and finally to the La Niña pattern,there were different inner nonlinear dynamic processes in the atmospheric circulation.In June,there were weaker wave-wave and wave-mean flow interactions.Although there was stronger wave-wave interaction,there was weaker wave-mean flow interaction.The persistently weaker wave-mean flow interaction made the western Pacific subtropical to be positioned more southward than normal during the summer of 1998,and then cause the heavy rainfall belt to maintain over the Yangtze River valley. |
| Keywords: | Yunnan high temperature and drought summer monsoon of South China Sea subtropical high tropical convection |
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