摘要
利用1961-2016年NOAA海表温度、NCEP/NCAR再分析资料以及山东降水资料,对比不同类型El Niňo事件次年夏季山东逐月降水异常分布和环流异常特征。结果表明:不同类型El Niňo事件对山东次年夏季各月降水影响不同,但三种分布类型事件次年6月山东降水异常均较7、8月弱,且极值分布较为集中。Niňo3型事件次年夏季山东降水以偏少为主,其中6、8月降水偏少,7月降水偏多;Niňo4型事件次年夏季山东降水以偏多为主,其中6月全省降水显著偏多,7月降水异常呈东西少、中间多的分布,8月降水异常呈东南多、西北少的分布;Niňo3.4型事件次年夏季山东降水基本呈现北多南少的异常分布,6月降水偏少,7月降水大部地区偏多,8月降水呈现东南少、西北多的异常分布。降水异常分布主要由不同类型El Niňo事件次年夏季各月500 hPa环流形势、水汽输送及其辐合等决定,而环流异常则受海温影响显著。
Based on the sea surface temperature from NOAA, reanalysis data from NCEP/NCAR and monthly precipitation in Shandong from 1961 to 2016, the anomalous characteristics of monthly precipitation in Shandong Province and circulation in the following summer of El Niňo events with different patterns were compared. The results show that the effects of El Niňo events with different patterns on monthly precipitation in the following summer in Shandong were obviously different, but the intensity of rainfall anomaly in the following June of El Niňo events with three types was weaker than that in the following July and August, and the distribution of extreme values was intensive. The precipitation in the following summer of Niňo3 pattern in Shandong was less than that in normal years, and the precipitation was less in June and August, while that was more in July. When El Niňo events occurred in the central Pacific(Niňo4 area), the precipitation in the following summer was more in most areas of Shandong, and the precipitation was significantly more in June, while it was more in the middle and less in the east and the west in July, and it was more in the southeast and less in the northwest in August. When the distribution of El Niňo events appeared Niňo 3.4 pattern, the precipitation in the following summer was more in the north and less in the south of Shandong. The precipitation was less in June and more in July in most areas of Shandong, and it was less in the southeast and more in the northwest in August. The anomalous distribution of 500 hPa circulation, water vapor transport and convergence directly determined the characteristics of precipitation anomaly in Shandong in the following summer of El Niňo events with different patterns, and the influence of sea surface temperature on circulation anomalies was significant.
作者
李媛
李瑞芬
张熙
LI Yuan;LI Ruifen;ZHANG Xi(Linyi Meteorological Bureau of Shandong Province, Linyi 276000, Shandong, China;Jining Meteorological Bureau of Shandong Province, Jining 272000, Shandong, China)
出处
《干旱气象》
2019年第5期762-770,共9页
Journal of Arid Meteorology
基金
山东省气象局预报员专项项目(SDYBY2018-14)和山东省气象局面上课题项目(2018sdqxm17)共同资助
关键词
EL
Niňo分布型
次年夏季降水
西太平洋副热带高压
水汽输送
山东
El Niňo patterns
the following summer precipitation
western Pacific subtropical high
water vapor transport
Shandong
