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The Linkage between Two Types of el Ni?o Events and Summer Streamflow over the Yellow and Yangtze River Basins

Advances in Atmospheric Sciences 2020年第2期37卷 160-172页

作者： Dan WANG Aihui WANG Lianlian XU Xianghui KONG Nansen-Zhu International Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100029China

It is generally agreed that el nino can be classified into East Pacific(EP)and Central Pacific(cp)***,little is known about the relationship between these two types of el Ni?o and land surface climate *** study investigates the linkage between EP/cp el Ni?o and summer streamflow over the Yellow and Yangtze River basins and their possible *** the Yellow River basin,the anomalous streamflow always manifests as positive(negative)in EP(cp)years,with a correlation coefficient of 0.39(-0.37);while over the Yangtze River basin,the anomalous streamflow shows as positive in both EP and cp years,with correlation coefficients of 0.72 and 0.48,*** of the surface hydrological cycle indicate that the streamflow is more influenced by local evapotranspiration(ET)than precipitation over the Yellow River basin,while it is dominantly affected by precipitation over the Yangtze River *** different features over these two river basins can be explained by the anomalous atmospheric circulation,which is cyclonic(anticyclonic)north(south)of 30°N over East *** years are dominated by two anticyclones,which bring strong water vapor convergence and induce more precipitation but less ET,and subsequently increase streamflow and flooding *** cp years,especially over the Yellow River basin,two cyclones dominate and lead to water vapor divergence and reduce moisture ***,the ET enhances mainly due to local high surface air temperature,which further evaporates water from the *** a result,the streamflow decreases,which will then increase the drought risk.

关键词： summer streamflow EP el nino cp el nino Yellow River basin Yangtze River basin

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A COMPARATIVE ANALYSIS OF ATMOSPHERIC AND OCEANIC CONDITIONS BEFORE THE OCCURRENCE OF TWO TYPES OF el nino EVENTS

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Journal of Tropical Meteorology 2019年第1期25卷 34-44页

作者： ZHI Xie-fei YANG Hua XU Shu-wen WANG Xiao-chun PAN Meng-ting Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology (NUIST) Nanjing Joint Center for Atmospheric Research Nantong Marine Environmental Monitoring Center School of Marine Science NUIST Jiangsu Engineering Technology Research Center of Marine Environment Detection NUIST

The atmospheric and oceanic conditions before the onset of EP el Ni?o and cp el Ni?o in nearly 30 years are compared and analyzed by using 850 hPa wind, 20℃ isotherm depth, sea surface temperature and the Wheeler and Hendon index. The results are as follows: In the western equatorial Pacific, the occurrence of the anomalously strong westerly winds of the EP el Ni?o is earlier than that of the cp el Ni?o. Its intensity is far stronger than that of the cp el Ni?o. Two months before the el Ni?o, the anomaly westerly winds of the EP el Ni?o have extended to the eastern Pacific region, while the westerly wind anomaly of the cp el Ni?o can only extend to the west of the dateline three months before the el Ni?o and later stay there. Unlike the EP el Ni?o, the cp el Ni?o is always associated with easterly wind anomaly in the eastern equatorial Pacific before its onset. The thermocline depth anomaly of the EP el Ni?o can significantly move eastward and deepen. In addition, we also find that the evolution of thermocline is ahead of the development of the sea surface temperature for the EP el Ni?o. The strong MJO activity of the EP el Ni?o in the western and central Pacific is earlier than that of the cp el Ni?o. Measured by the standard deviation of the zonal wind square, the intensity of MJO activity of the EP el Ni?o is significantly greater than that of the cp el Ni?o before the onset of el Ni?o.

关键词： EP el nino cp el nino equatorial zonal wind thermocline MJO

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ENSO形态变异对我国西南地区冬季降水的影响

ENSO形态变异对我国西南地区冬季降水的影响

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第34届中国气象学会年会

作者：陶威陈权亮成都信息工程大学大气科学学院高原大气与环境四川省重点实验室

我国是干旱灾害频发的国家。近年来我国干旱区域不断增大有从干旱区向湿润区发展的趋势,西南地区屡屡发生严重的干旱灾害造成了难以估量的损失。近年来发生在西南地区的几次异常干旱灾害事件主要有2005年春季云南异常干旱,2006年夏季川... 详细信息

我国是干旱灾害频发的国家。近年来我国干旱区域不断增大有从干旱区向湿润区发展的趋势,西南地区屡屡发生严重的干旱灾害造成了难以估量的损失。近年来发生在西南地区的几次异常干旱灾害事件主要有2005年春季云南异常干旱,2006年夏季川渝地区特大干旱,以及2009年秋至2010年春以云南贵州为中心的5个省份的旱灾,特别是2009-2012年的干旱事件具有持续时间长影响范围广灾害程度重的特点,是西南地区有气象记录以来最严重的气象干旱事件。同时ENSO是影响全球气候年际变化的最强信号,它的发生、发展会导致区域甚至全球大气环流异常,并对我国降水造成显著影响。因此ENSO的研究对减少西南地区干旱具有十分重要的意义。

关键词： EP el nino cp el nino 降水

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