两类El Ni駉事件次年夏季长江—黄河流域降水
投稿时间: 2017-01-03  最后修改时间: 2017-02-20  点此下载全文
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李丽平 南京信息工程大学 li.liping@163.com 
中文摘要:摘 要:利用1961年1月-2014年12月Hadley气候预测研究中心的全球海表温度(SST)资料,NECP/NCAR逐日风场、比湿等再分析资料,国家气象信息中心提供的中国753站逐日降水、160站逐月降水资料,对比分析了东部(EP)型和中部(CP)型两类El Niño事件次年夏季长江—黄河流域降水(简记为EP型和CP型降水)低频特征,以及与之相关的低频水汽输送差异。结果表明, 1)平均而言,EP型降水主要有10-20d(最显著)以及20-30d(次显著)低频周期;CP型降水主要有10-20d的低频显著周期。与之相关的纬、经向水汽通量最显著低频周期也为10-20 d。2)影响EP、CP型低频降水共同的低频水汽环流系统主要有:菲律宾群岛附近的异常反气旋式水汽环流和渤海湾附近(日本东南侧)的异常气旋式(反气旋式)水汽环流。另外,影响EP(CP)型低频降水的还有来自巴尔喀什湖东北部异常气旋式水汽环流(孟加拉湾、苏门答腊岛以西的异常气旋式水汽环流对和贝加尔湖西、东两侧的异常气旋式、反气旋式环流)。3)EP型降水暖湿水汽主要源自南海,冷湿水汽主要源自西北太平洋,冷空气来自巴尔喀什湖东北部和贝加尔湖西北侧。CP型降水暖湿水汽少量来自阿拉伯海和印度洋,大量来自热带西太平洋;冷空气主要来自贝加尔湖西北侧。
中文关键词:两类El Ni駉事件  长江—黄河流域  夏季降水  水汽通量  低频振荡
 
Differences about low-frequency characteristics of precipitation in the Yangtze River and the Yellow River basin and its moisture transport
Abstract:Abstract: Using the global sea surface temperature(SST)from Hadley Climate Prediction and Research Center, NCEP\NCAR daily wind field and specific humidity, and 753-station daily precipitation and 160-station monthly precipitation data from national meteorological information center, the differences about low-frequency characteristics of precipitation and its related moisture transport path in the Yangtze River and the Yellow River basin in the following summer of eastern Pacific (EP) and center Pacific (CP) type El Niño events are analyzed, For convenience, precipitation is also called EP type and CP type respectively. The results show that, 1)On average, there is 10-20d low-frequency oscillation period which is the most significant and 20-30d period which is more significant for EP type precipitation; there is 10-20d low-frequency oscillation period which is the most significant for CP precipitation。The significant period of the related vapor flux is also 10-20 d. 2)The main and common10-20 d vapor circulation systems which affect EP and CP type low-frequency precipitation include the anomalous anticyclonic moisture circulation around Philippines, the anomalous cyclonic( anticyclonic) moisture circulation to the Bohai Gulf( the southeast of Japan Sea). In addition, 10-20 d vapor circulation systems which affect EP(CP) type low-frequency precipitation also include the anomalous cyclonic moisture circulation to the northeast of the Balkhash(the anomalous cyclonic moisture circulation pairs around Bay of Bengal and to the west of Sumatra; the anomalous cyclonic and anticyclonic moisture circulation to the western and eastern side of Baikal Lake respectively). 3) Warm vapor of EP type precipitation comes from Nanhai, cold vapor from northwest Pacific and the cold air from northeast to Balkhash and northeast to the Baikal Lake. a little of warm vapor of CP type precipitation comes from the Arabian Sea and Indian ocean, a large amount of warm vapor from tropical Western Pacific, the cold air from northeast to the Baikal Lake.
keywords:two types of El Ni駉 events  the Yangtze River-the Yellow River basin, summer precipitation  vapor flux  low-frequency oscillation
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