Journal of Arid Meteorology

Previous Articles     Next Articles

Impacts of Different Types ElNio Events on the Next Spring Precipitation in Ningxia

LI Xin1,2,WANG Suyan1,2,ZHENG Guangfen1,2,DING Xiaojin2,ZHOU Hu2,YANG Jianling1   

  1. 1.Key Laboratory of Preventing and Reducing Meteorological Disaster of Ningxia,
     Yinchuan 750002, China; 2. Ningxia Climate Center, Yinchuan 750002, China
  • Online:2016-04-30 Published:2016-04-30

不同分布型ElNio事件次年宁夏春季降水的差异

李欣1,2,王素艳1,2,郑广芬1,2,丁小谨2,周虎2,杨建玲1   

  1. 1.宁夏气象防灾减灾重点实验室,宁夏银川750002;2.宁夏气候中心,宁夏银川750002
  • 通讯作者: 王素艳(1974-),女,宁夏中宁人,硕士,高级工程师,主要从事气候、气候资源及气候灾害评估方面的工作. E-mail:nxwsy_cn@sina.com
  • 作者简介:李欣(1983- ),女,回族,宁夏同心人,硕士,工程师,主要从事气候及气候变化研究.E-mial:lixin_720@163.com
  • 基金资助:

    公益性行业(气象)科研专项(GYHY201306027)、公益性行业(气象)科研重大专项(GYHY201506001)和气象关键技术集成与应用项目(CMAGJ2015M65)共同资助

Abstract:

Based on the monthly precipitation data in spring at 20 weather stations in Ningxia and  reanalysis data provided by National Centers for Environmental Prediction (NCEP) from 1961 to 2014, the impacts of El Nio events with different types on the next spring precipitation in Ningxia were analyzed.The results show that the response of the next spring precipitation in Ningxia to El Nio had changed due to the El Nio event being mainly the Central Pacific type after the 1990s, and the spring precipitation patterns changed from more to less in Ningxia. The probabilities of the anomalously more precipitation and atmospheric circulations were different under the influence of different types El Nio events. Under the influence of the Eastern Pacific and Mixed types of El Nio events, the distribution of 500 hPa circulation, the water transport and wind field on 700 hPa over Ningxia were benefical to produce rainfall in the next spring, and would possibly induce to increase the probability of the anomalously more spring precipitation. However, under the impact of the Central Pacific type of El Nio, the westerly winds on 700 hPa predominated over southern Tibet Plateau and the relative humidity on 700 hPa was less over southeastern Tibet Plateau, which would possibly induce the probability of spring precipitation decrease.

Key words: different types, ElNio, spring precipitation, Ningxia

摘要:

利用1961~2014年春季宁夏20个气象站的降水及NCEP再分析等资料,重点分析了不同分布型El Nio事件次年宁夏春季降水的差异。结果表明:由于El Nio事件在1990年代以后主要转为中部型,宁夏春季降水对El Nio的响应也发生了变化,由之前在El Nio发生次年春季降水偏多,转为次年春季降水偏少。东部型和混合型ElNio事件次年春季,500 hPa高度距平场上欧亚中高纬地区环流分布及700 hPa水汽输送条件,均有利于宁夏出现降水;而中部型El Nio事件次年春季,青藏高原南侧以偏西风为主,青藏高原东南侧相对湿度较低,不利于宁夏春季出现降水。

关键词: 不同分布型, ElNio, 春季降水, 宁夏

CLC Number: