气候变化研究进展 ›› 2017, Vol. 13 ›› Issue (2): 103-116.doi: 10.12006/j.issn.1673-1719.2016.041

• 气候系统变化 • 上一篇    下一篇

1961—2014年我国西南地区干湿季变化特征

贾孜拉·拜山1,李维京2,1,孙丞虎2,1,左金清2,1,张若楠2,3,刘景鹏2, 3   

  1. 1 南京信息工程大学气象灾害预报预警与评估协同创新中心,南京 210044
    2 中国气象局气候研究开放实验室/中国气象局国家气候中心,北京 100081
    3 中国气象科学研究院,北京 100081

  • 收稿日期:2016-03-02 修回日期:2016-06-14 出版日期:2017-03-30 发布日期:2017-03-30
  • 通讯作者: 李维京 E-mail:liwj@cma.gov.cn
  • 基金资助:

    国家重点基础研究发展计划项目;公益性行业(气象)科研专项

Characteristics of Wet and Dry Seasons in Southwest China During 1961-2014

Jiazila·Baishan1, Li Weijing2, 1, Sun Chenghu2, 1, Zuo Jinqing2, 1, Zhang Ruonan2, 3, Liu Jingpeng2, 3   

  1. 1 Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China
    2 Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081, China
    3 Chinese Academy of Meteorological Sciences, Beijing 100081, China
  • Received:2016-03-02 Revised:2016-06-14 Online:2017-03-30 Published:2017-03-30

摘要:

利用中国1961—2014年逐日降水观测等资料,分析了西南地区的干湿季变化特征。结果表明:西南地区东部和西北部最早进入湿季;干季由四川盆地、贵州南部开始。西南中东部以及南部等地的湿季长度较长,干季则与之相反。干湿季开始日期以及干湿季长度均具有明显的年代际变化特征,在1970年代中期到1980年代发生了气候突变,呈现湿季长度变短,干季变长的趋势。湿季降水呈现东南多、西北少的特征,并表现出中东部减少,西部增加的趋势;干季降水则表现为东多西少的特点,在东部呈增加,在四川等地呈减少趋势。进一步分析表明:湿季异常偏湿(干)年,开始日期易偏早(晚),结束易偏晚(早),长度偏长(短);干季开始异常偏早(晚)年,干季长度长(短),干季略偏湿(干);太平洋、印度洋海温异常影响东亚大气环流的异常是造成西南地区干湿季出现异常的主要原因。

关键词: 西南区域, 湿季, 干季, 气候特征

Abstract:

By utilizing daily precipitation dataset from 1961 to 2014 in China, the characteristics of wet and dry seasons in Southwest China were analyzed. The results indicated that the wet season started from the eastern and northwestern part of this region, and the dry season started from the Sichuan Basin, southern Guizhou. The climatological wet season was longer in the mid-east and south of Southwest China, and vice versa the dry season. The onset date and length of wet and dry seasons exhibited abrupt shift in the mid-1970s to the 1980s, and it is very significant that the length of wet (dry) season became shorter (longer). There were large differences in the spatial and temporal features of the precipitation between the wet and dry season. There was more precipitation in southeastern part than in northwestern area in wet season, and the decreasing trend was observed in eastern part while increasing trend in the western part. For the dry season, there was more precipitation in the eastern Southwest China than in the western part, the precipitation in Chongqing and Guizhou showed an increasing trend, while a decreasing trend was found in Sichuan. In the anomalous wet (dry) years of wet season, the onset date was earlier (later), the end date tended to be later (earlier), the length of wet season was longer (shorter). In the anomalous earlier (later) onset years of dry season, the length of dry season was longer (shorter), and more (less) precipitation was observed in the season. The main reason of the abnormalities of wet and dry seasons in Southwest China was that the East Asia atmospheric circulation anomalies were influenced by the Pacific and Indian SST anomalies.

Key words: Southwest China, wet season, dry season, climatic characteristics

京ICP备11008704号-4
版权所有 © 《气候变化研究进展》编辑部
地址:北京市海淀区中关村南大街46号 邮编:100081 电话/传真:(010)58995171 E-mail:accr@cma.gov.cn
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn