摘要
利用环青海湖地区8个气象站点1961—2018年逐日降水数据,分析了该地区夏半年降水量和极端降水指标的时空变化和大气环流特征。结果表明:近60 a环青海湖地区夏半年降水量呈显著增加趋势;极端降水事件各项指标(夏半年的极端降水量、极端降水日数、极端降水强度、1日最大极端降水量、极端降水事件频率)呈上升趋势,尤其是2005年以来各项极端降水指标上升趋势特别明显。21世纪初期是环青海湖地区的降水突变期,夏半年降水量和极端降水事件多项指标均在这一时期发生了突变。通过对极端降水指标与环流变化的关系研究发现,南极涛动指数(AAO)、西太平洋副高强度指数(WPSH)与极端降水指标显著正相关。在2006年前后南极涛动指数(AAO)和西太平洋副高指数(WPSH)发生比较明显的转折性变化,最终导致环青海湖地区夏半年极端降水各项指标在2006前后出现比较明显的突变。环青海湖地区夏半年降水量和极端降水量均存在6 a的短周期和16 a左右的长周期。环青海湖地区夏半年极端降水量和极端降水日数均表现为西部较东部显著的空间变化特征。
This study investigated characteristics of extreme precipitation,atmospheric circulation and its relationship around the Qinghai Lake region in recent 60 years in order to provide evidence to understand variation of water resource in Qinghai-Tibetan plateau.In this paper,spatial and temporal variation of extreme precipitation was analyzed in details based on daily precipitation data from meteorological stations using liner trend analysis method.Precipitation of summer half year,extreme precipitation index increased significantly in recent 60 years around the Qinghai Lake region,especially since 2005.Abrupt change has happened in precipitation in the early 21st century,and most extreme precipitation index in summer half year had abrupt changes in this period.The Antarctic Oscillation Index(AAO)and the Western Pacific Subtropical High Intensity Index(WPSH)led to an obvious abrupt changes on extreme precipitation and significantly positively correlated with extreme precipitation index.There was a short cycle of 6 years and a long cycle about 16 years in summer half year precipitation and extreme precipitation around the Qinghai Lake region.The increasing trends of extreme precipitation and extreme precipitation days in summer half year are more significant in the west than in the east around the Qinghai Lake region.
作者
达鹏奎
白文娟
陈晶
李晓东
DA Pengkui;BAI Wenjuan;CHEN Jing;LI Xiaodong(Qinghai Provincial Key Laboratory of Disaster Prevention and Reduction,Xining 810001,China;Yushu Tibetan Autonomous Prefectural Meteorological Bureau,Yushu 815000,China;Haidong Meteorological Bureau,Haidong 814000,China;Huangnan Tibetan Autonomous Prefectural Meteorological Bureau,Tongren 811300,China;Qinghai Institute of Meteorological Science,Xining 810001,China)
出处
《沙漠与绿洲气象》
2022年第3期75-83,共9页
Desert and Oasis Meteorology
基金
青海省科技厅科技计划项目(2019-ZJ-7036)
国家自然基金项目(41961012)
青海省气象局重点项目(QXZ2020-08)。
关键词
夏半年极端降水
突变
周期
时空变化
环青海湖地区
extreme precipitation in summer half year
mutation
cycle
spatial and temporal variation
Qinghai Lake region
