摘要
基于江苏省66个站点逐日降水观测资料,利用降水集中度指数PCD和Q,分析了1961—2014年江苏省降水集中度的非均匀性特征。结果表明:1)江苏省降水集中度指数PCD和Q的历年平均值分别为0.416和0.353,PCD年际变化较大,多年呈减小的趋势,而Q的年际变化较小,呈增大趋势,但PCD和Q的多年变化趋势均较小。2)全省从北部到南部降水集中程度逐渐减小,即江苏省北部地区降水比南部地区集中,但前者的降水集中时段较后者略晚。3)多水年的降水集中度指数PCD比少水年大,即多水年降水比少水年更集中,而Q值在多水年和少水年差别不大,甚至少水年降水更集中。4)降水集中度指数PCD和Q在多水年和少水年的空间分布均呈现"北高南低"特征,无论多水年还是少水年,江苏省北部地区降水均比南部更为集中。
Based on the daily precipitation data from 66 stations in Jiangsu province during 1961-2014,the intra-seasonal heterogeneity of the precipitation was analyzed by using precipitation concentration degree（PCD）and Q over Jiangsu province.The results showed that the average PCD was 0.416 and the average Q was 0.353.The inter-annual variation of PCD presented a negative trend,and was more significantly than that of Q,which showed a positive trend.The concentration degree of precipitation decreased from north to south,which meant that precipitation in northern Jiangsu was more concentrated than that in southern Jiangsu,and the precipitation concentration period in northern Jiangsu was slightly later than the South.In high flow years,the PCD was more concentrated than that in low flow years,while the Q in high flow years had little difference with that in low flow years,and the Q in low flow years was even more concentrated.In addition,the spatial distribution of PCD and Q in high or low flow years presented high values in the north and low values in the south,and the precipitation in northern Jiangsu was more concentrated than in southern Jiangsu.
作者
王睆
李泽宇
刘瑞翔
庞礴
沈伟
张莹
Wang Huan;Li Zeyu;Liu Ruixiang;Pang Bo;Shen Wei;Zhang Ying(Suqian Meteorological Bureau of Jiangsu Province,Suqian 223800,China;Lianyungang Meteorological Bureau of Jiangsu Province,Lianyungang 222002,China)
出处
《气象与减灾研究》
2018年第1期36-43,共8页
Meteorology and Disaster Reduction Research
基金
安徽省宿迁市气象局自立课题(编号:sq201602)
宿迁市科技支撑计划项目(编号:S201607)
