北部湾经济区降水年内非均匀性特征分析

Intra-annual Inhomogeneity Characteristics of Precipitation in Guangxi Beibu Gulf Economic Zone

基于广西北部湾经济区分布较均匀的12个雨量站1961年~2011年日降水资料,统计出各站各年降水集中度(pcd)和集中期(pcp)指标,再基于该指标分析区域降水集中度和集中期多年均值、变化趋势、与年降水量相关性、多水年少水年合成分析的空间分布情况,以期研究区域降水年内非均匀分布的时空变化特征。结果表明,pcd、pcp均值区域差异明显;pcd呈上升趋势,pcp为下降趋势;多水年与少水年的pcd空间分布比较相似,但多水年与少水年的pcp空间分布差异较大。

Based on the daily precipitation data between 1961 and 2011 from 12 rainfall stations in Guangxi Beibu Gulf Economic Zone, the Precipitation Concentration Degree （PCD） and Precipitation Concentration Period （PCP） are calculated for each rainfall station in each year, and then based on these index, the inhomogeneous distribution characteristics of inter-annual precipitation are analyzed by introducing the spatial distribution of annual mean values, variable coefficients, correlation coefficients between annual precipitation, change trends and composite analysis. The results show that： （a） the annual mean values of PCD and PCP in different regions are obvious; （b） PCDs are mainly upward trend, while PCPs are downward trend; and （c） more-precipitation year composite analysis of PCD is similar to less-precipitation years in spatial distribution, but there is an obvious difference of PCPs between more-precipitation and less-precipitation years.