摘要
利用华南地区的广西壮族自治区和广东省的178个气象站1951—2012年的观测资料,对华南地区单站和区域持续性低温雨雪事件进行了定义和检测,并对其时空变化特征进行了分析,目的是为华南冬季低温雨雪事件预测及低温雨雪灾害对生态环境影响预估提供参考。结果表明:华南地区单站低温雨雪事件主要发生在23°N以北地区,事件高频区主要集中在广西的东北部和广东的西北部,而区域持续性低温雨雪事件则主要发生在24°N以北,事件影响区域与单站事件高频区基本相同;单站和区域持续性低温雨雪事件发生频次最多的月份都是1月,2月次之,且都是在20世纪七八十年代发生次数较多,这与华南区域冬季气温的气候变化特征较为相符;低温雨雪事件的发生与海拔有密切关系,海拔在100～200 m的站点较容易发生低温雨雪事件;利用冷湿指数分析区域持续性低温雨雪事件的强度发现,严重的事件多发生在70年代,进入90年代后,呈现减少的趋势,但事件的严重性及造成的灾害趋于极端。
We defined and detected the station-based and regional persistent cold rain and snow events over South China( Guangxi and Guangdong) using observation data from 178 stations during 1951-2012,and analyzed their spatio-temporal variation. We aimed to provide a reference for the prediction of cold rain and snow events and for the estimation of the impacts of cold rain and snow events on ecological environment in winter over South China. Station-based events over South China occurred mainly in the north of 23°N,and high-frequency events area mainly concentrated over northeast Guangxi and northwest Guangdong. The regional events mainly occurred in the north of 24°N,and high-frequency events area was similar with the station-based events.The most station-based and regional persistent cold rain and snow events occurred in January,followed by February. The events were more frequent in the 1970 s and 1980 s,consistent with the climatic change characteristics of winter temperature over South China. The occurrence of cold rain and snow events was closely related to elevation and terrain. The events occurred more easily in the stations with elevation between 100-200 m. The analysis of the intensity of regional persistent cold rain and snow events using the cold-wet index showed that serious events were more frequent in the 1970 s. After the 1990 s,the serious events tended to be reduced but the severity was more extreme.
作者
陆虹
周秀华
黄卓
秦川
农孟松
LU Hong;ZHOU Xiu-hua;HUANG Zhuo;QIN Chuan NONG Meng-song(Guangxi Climate Center, Nanning 530022,China;Guangxi Meteorological Observatory,Nanning 530022,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2019年第1期237-246,共10页
Chinese Journal of Ecology
基金
国家自然科学基金项目(41565005)
广西自然科学基金项目(2015GXNSFAA139243)
广西科技计划项目(桂科AB16380260)
广西区气象局气象科研计划项目(桂气科2017M04)
广西气象局延伸期气候预测创新团队项目资助
关键词
华南地区
持续性低温雨雪
区域性
South China
persistent cold rain and snow
regionality
