【摘要】 利用长白山地区13个台站1960—2007年逐日降水资料,采用降水集中度和降水集中期的概念,提出降水集中时段的指标,并应用这些指标分析了该地区生长季降水特征。结果表明:历年降水集中度平均为0.31,年际、年代际变化特征明显;降水集中度准10年周期波动比较明显;从降水集中度的站间差异看,具有明显的空间非均一性;历年降水集中期平均为84.6d(7月24日),年际、年代际变化比较明显,历年的均方差为9.7d,变差系数为11.5%;从站间差异看,降水集中期具有明显的空间非均一性,历年站间降水集中期的均方差的平均为10.9d。更多还原

【Abstract】 Based on the 1960-2007 daily precipitation data from 13 meteorological stations in Changbai Mountains,and by using the concepts of precipitation concentration degree and precipitation concentration period,an analysis on the precipitation characteristics in this region in growth season was carried out,with the proposing of the index precipitation concentration point. In the study region,the average precipitation concentration degree in past years was 0.31,and its interannual and interdecadal variations were obvious. The precipitation concentration degree of 10-year quasi-period fluctuated markedly. There was an obvious spatial non-uniformity of precipitation concentration degree among the 13 meteorological stations. The average precipitation concentration period in past years was 84.6 d,also with obvious interannual and interdecadal variations. The average variance was 9.7 d,and the variation coefficient was 11.5%. An obvious spatial non-uniformity was also observed in the precipitation concentration period among the 13 meteorological stations,and the average variance was 10.9 d.更多还原