摘要
基于国家气候中心重建的西太平洋副热带高压(以下简称西太副高)指数及黑龙江夏季降水资料,分析了黑龙江夏季降水气候特征及西太副高影响.结果表明:①黑龙江省夏季降水中南部和中北部最多,年内65.2%的降水在夏季,夏季降水集中时段是7月的中下旬和8月上旬.②7月西太副高强度最大,脊点最西;6月位置最南;8月强度最小,脊线最北,脊点最东.6月、7月西太副高易出现两种偏态,即偏西偏南或偏东偏北.20世纪80年代至21世纪10年代,西太副高强度和脊线位置逐年代增加,西伸脊点逐年代减小.③夏季黑龙江的较多降水是西太副高西伸脊点和脊线位于两个区域带来的:一个是西伸脊点位于105°~125°E、脊线位于20°~30°N,带来28.9%的降水;另一个是西伸脊点位于85°~90°E、脊线位于20°~35°N,带来14.9%的降水.
Based on the characteristic index of the western Pacific subtropical high(WPSH)reconstructed by the National Climate Center and the summer precipitation data over Heilongjiang Province,the relationship between the Northwest Pacific Subtropical High and the summer precipitation over Heilongjiang was analyzed.The results are as follows:①The southern and central north of Heilongjiang Province is the most abundant in summer.During the year,65.2%of the precipitation is in the summer,and the summer precipitation concentration period is in the middle and late July and early August.②In July,the intensity index of WPSH was the largest,and the ridge point index of WPSH was westernmost;the ridge line of WPSH in June was southernmost;the intensity of WPSH in August was the lowest,the ridge line was northernmost,and the ridge point was easternmost.In June and July,the WPSH is prone to two states,either to the west-south or to the east-north.From the 1980s to the 2010s,the intensity and ridge position of WPSH increased decade by decade,and the west extension ridge point of WPSH decreased.③The more precipitation in Heilongjiang in summer is caused by the west ridge point and ridge line of WPSH in two areas.One is the west extension ridge point at 105°-125°E and the ridge line at 20°-30°N,bringing 28.9%precipitation of summer;the other is the west ridge point at 85°-90°E and the ridge line at 20°-35°N,bringing 14.9%precipitation.
作者
康恒元
周贺玲
刘玉莲
KANG Hengyuan;ZHOU Heling;LIU Yulian(Harbin Bureau of Meteorology,Harbin 150028,China;Langfang Meteorological Bureau,Langfang 131001,Hebei China;Heilongjiang Climate Center,Harbin 150030,China)
出处
《河南科学》
2021年第8期1324-1332,共9页
Henan Science
基金
黑龙江省自然科学基金联合引导项目(LH2019D013)
中国气象局气候变化专项(CCSF201842)
国家自然科学基金(41771067)。
关键词
西太平洋副热带高压
黑龙江
夏季
降水
western Pacific subtropical high
Heilongjiang
summer
precipitation