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湖南春雨特征及异常成因分析
张剑明1, 叶成志2, 曾宇星3, 谢益军3
(1.湖南省气候中心 湖南 长沙 410118;2.湖南省气象台;3.湖南省气候中心)
Characteristics of Spring Persistent Rains in Hunan and Its Anomaly Causes
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投稿时间:2020-12-25    修订日期:2021-06-30
中文摘要: 本文确定了湖南春雨建立的上游西南风速关键区,定义了湖南春雨的开始日期、结束日期、雨量、雨期、强度指数等相关指标,分析了湖南春雨指标的时间变化特征及春雨的空间分布特征,探讨了湖南春雨强、弱年大气环流和水汽输送的异常特征及前期海温异常特征。结果表明,湖南春雨发生的时段气候平均为第13候至第27候,不同年份开始和结束的早晚不尽相同,湖南春雨量在20世纪80年代中期以前、2014年以后偏多,20世纪80年代中期至2014年前后偏少。湖南全省一致型强春雨年有1981、1992、2014、2016年,全省一致型弱春雨年均发生在1990年以后,有1991、1994、2008、2011年。全省一致型强春雨年西太平洋副热带高压(西太副高)明显偏强、偏西,南支槽偏弱,低层风场在我国江南地区有异常气旋环流控制,湖南为异常气旋环流中心,导致春雨偏强;全省一致型弱春雨年西太副高明显偏弱、印缅槽偏强,低层风场在西南地区东部至江南有一个异常反气旋,湖南为水汽异常辐散中心,导致春雨偏弱。El Nino事件发展的次年湖南春雨开始早、雨期长、雨量偏多、强度强,反之La Nina事件发展的次年湖南春雨开始晚、雨期短、雨量偏少、强度弱。
Abstract:In this study, the key area of upstream southwest wind speed was established, which is closely associated with Spring Persistent Rains in Hunan (SPRH). The starting date, ending date, rainfall, rainy period and intensity index of SPRH were defined from 1980 to 2014. The temporal and spatial patterns of SPRH rainfall were analyzed. The anomaly of the atmospheric circulations during the strong/weak SPRH period and sea surface temperature (SST) during the early period were discussed. Results showed that: The climate average of SPRH occurred from the 13 pentads to the 27 pentads, whereas the starting date and ending date of SPRH varied in different years. The rainfall of SPRH was exceeded normal conditions during the periods of before the mid-1980s and after 2014, whereas it was lower than normal conditions during the periods of the mid-1980s to 2014. The strong years of SPRH in whole province were found in 1981, 1992, 2014 and 2016. By contrast, the weak years of SPRH in whole province occurred after 1990 including 1991, 1994, 2008 and 2011. In the strong SPRH years in whole province, the western pacific subtropical high (WPSH) remarkably became stronger and westward; the Indo-Burmese trough tended to become weaker; and an anomalous anticyclone existed in the southern Yangtze River regions in low-level wind field. Hunan was located in the center of anomalous anticyclone, which led to strong SPRH. However, in the weak SPRH years, WPSH evidently became weaker; the Indo-Burmese trough tended to become stronger; and an anomalous cyclone was found in southern China. Additionally, Hunan was located in the center of anomalous water vapor divergence, resulting in weaker SPRH in whole province. In the following year of the occurrence of El Nino events, SPRH started earlier, longer rainy period, more intensive rainfall amount compared with the normal years. On the contrary, during the following year of the occurrence of La Nina, SPRH started later, shorted rainy periods, lower rainfall amount and weaker rainfall intensity compared with the normal years.
文章编号:202012250459     中图分类号:    文献标志码:
基金项目:湖南气象局2020年预报员专项(XQKJ20C011)
作者单位地址
张剑明 湖南省气候中心 湖南 长沙 410118 湖南省气象局
叶成志 湖南省气象台 湖南省长沙市天心区芙蓉南路4段196号
曾宇星 湖南省气候中心 
谢益军 湖南省气候中心 
Author NameAffiliationAddress
Zhang Jianming Hunan Climate Center,Changsha ,China 湖南省气象局
Ye Chengzhi  湖南省长沙市天心区芙蓉南路4段196号
Zeng Yuxing  
Xie Yijun  
引用文本:
张剑明,叶成志,曾宇星,谢益军,0.Characteristics of Spring Persistent Rains in Hunan and Its Anomaly Causes[J].Meteor Mon,():-.
Zhang Jianming,Ye Chengzhi,Zeng Yuxing,Xie Yijun,0.Characteristics of Spring Persistent Rains in Hunan and Its Anomaly Causes[J].Meteor Mon,():-.