摘要
为揭示近60年山东省降水的时空格局规律及其对不同环流因子的响应关系,基于山东省61个气象站1959—2017年的逐日降水数据,利用Mann-Kendall趋势检验、CEEMDAN、EOF及交叉小波变换等方法,对山东省降水的趋势性、时空演变特征以及多尺度特征进行了研究,并探究了降水与不同大气环流因子在不同时频域下的共振周期和相干性。结果表明:(1)近60年来,山东省月降水呈现出显著的季节、年际以及年代际尺度特征,其中以年际周期振荡为主,累积方差贡献率达48.2%;同时,降水整体呈减少趋势。(2)经EOF分解表明,前3个模态的累积方差贡献率为68.1%,第一模态呈现全省降水变化趋势一致性,第二、三模态分别呈现西东和南北“+,-”反向分布特征。(3)大气环流因子MEI和PDO与山东省降水的关系较为密切,且主要作用于降水的年际周期尺度。
To reveal the temporal and spatial pattern of precipitation in Shandong Province and its response to different circulation factors according to the daily precipitation data documented from 1959 to 2017 at 61 weather stations in Shandong Province,the trend,spatiotemporal evolution and multi-scale characteristics of precipitation were studied with the methods including Mann-Kendall trend analysis,CEEMDAN,EOF and cross wavelet transform,and the resonance period and coherence between precipitation and different atmospheric circulation factors in different time frequency domain were investigated.(1)In the past 60 years,the monthly precipitation in Shandong Province had significant seasonal,interannual and interdecadal scale characteristics,of which the inter-annual scale oscillation cycle was the main.The cumulative variance contribution rate reached 48.2%;and the overall precipitation showed a decreasing trend.(2)The cumulative variance contribution rate of the first three modes was 68.1%.The first mode showed the consistency of the precipitation changing trend in the whole province,and the second and third modes showed the west-east and north-south"+,-"reverse distribution.(3)The atmospheric circulation factors MEI and PDO were closely related to the precipitation,and strongly influenced the interannual cycle scale of precipitation.
作者
庄光媛
拾兵
王俊杰
ZHUANG Guangyuan;SHI Bing;WANG Junjie(College of Engineering,Ocean University of China,Qingdao 266100,China)
出处
《海洋湖沼通报》
CSCD
北大核心
2023年第5期23-31,共9页
Transactions of Oceanology and Limnology
基金
NSFC-山东省联合基金项目(U2006227,U1906234)。
关键词
山东省
降水
CEEMDAN
EOF
环流因子
Shandong Province
precipitation
CEEMDAN
EOF
atmospheric circulation factor
