内蒙古地区近53a降水格局的时空变化特征  

Spatial-Temporal Variations of Precipitation Pattern in Inner Mongolia in Recent 53 Years

作　　者：徐慧[1] 陈鸣[1] 黄进[2] 

机构地区：[1]南京市环境保护科学研究院,江苏南京210013 [2]南京信息工程大学环境科学与工程学院,江苏南京210044

出　　处：《人民黄河》2015年第10期35-38,65,共5页Yellow River

基　　金：国家自然科学基金资助项目(51109109;41175136)

摘　　要：利用我国内蒙古地区1960-2012 年46 个气象站点的逐日降水数据,分析了该地区降水格局的分布特征,并采用Mann - Kendall 趋势检验法探求了降水格局年际变化趋势的显著性.结果表明：①研究区降水集中性指数为20. 8 ～38. 6,全区年内降水分配极不规则,大部分站点的降水集中性指数呈减小趋势;②10 mm 以下的降水是研究区最主要的日降水类型,中等强度降水呈增加趋势,而强降水呈减少趋势;③历时1 ～ 2 d 的降水是研究区最主要的连续降水类型,中长期连续降水呈减少趋势;④历时1 ～10 d 的无雨期是研究区最主要的连续无雨期,但近50% 的无雨日集中在30 d 以上的连续无雨期,较长持续日数的连续无雨期呈减少趋势.Based on the daily precipitation data from 46 meteorological stations within Inner Mongolia Autonomous Region of China,the distribution characteristics of precipitation pattern was investigated during 1960-2012 in this study,and the M-K trend test were used to detect the inner-annual changes of precipitation pattern. The results show that: 1the precipitation concentration index of study area ranges between 20. 8 and 38. 6 and the inner-annual precipitation distributions of this area show higher irregularity,while most of stations display decreasing trends for PCI; 2 daily precipitation with intensity ≤10 mm is dominant in this area,and the moderate precipitation shows increasing trend,while the heavy precipitation shows decreasing trend; 3wet spells with 1- 2 day are prevalent in this area,and the wet spells with moderate-long duration are decreasing; 4dry spells with 1- 10 day are prevalent in this area,but 50% of dry days concentrate the dry spells with duration ≥30 days,and the dry spells with longer duration are decreasing.

关 键 词：降水集中性指数 变化特征 时空变化 降水格局 内蒙古 

分 类 号：P467[天文地球—大气科学及气象学]