内蒙古严寒期的时空变化特征与成因分析  

Spatial-temporal variation characteristics and the causes of cold period in Inner Mongolia

作　　者：王天强[1] 刘普幸[1] 

机构地区：[1]西北师范大学地理与环境科学学院,兰州730070

出　　处：《干旱区资源与环境》2017年第7期127-132,共6页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(40961035);甘肃省科技计划基金项目(0803RJZA094)资助

摘　　要：基于1960-2014年内蒙古46个气象站点逐日平均气温资料,运用线性趋势法、M-K突变检验、Morlet小波和相关分析等方法分析了内蒙古严寒期起止候及候数的时空变化特征与成因。结果表明:近55a来,内蒙古严寒期起始候推后、终止候提前、候数缩短,其倾向率分别为0.217P/10a、-0.198P/10a和-0.411P/10a;且空间差异显著,自东向西严寒期起始候推后、终止候提前、候数缩短的特征明显增强。严寒期起止候及候数分别在1990a、1987a、1993a发生突变,均存在11a左右中尺度与2a、4a的短尺度优势周期,与大气环流2~4a周期及太阳活动11a周期较吻合。冷空气、亚洲区极涡面积和亚洲区极涡强度指数是影响严寒期的主要因子。随经纬度的增加,严寒期起止候及候数有提前、推后和延长趋势。Based on daily average temperature of 46 meteorological stations from 1960 to 2014 in Inner Mongo- lia, We analyzed the spatial and temporal variation characteristics and causes for the onset and upset pentad and pentads of cold period in Inner Mongolia by using the methods of linear regression analysis, nonparametric Mann - Kendall test, wavelet analysis of Morlet and correlation analysis. The results showed that ： in the last 55 years, the onset pentad of cold period postponed and upset pentad advanced, the pentads shortened gradually, the trend rates were respectively 0. 217P/10a, -0. 198P/10a and -0.411P/10a; and the spatial difference was signifi- cant, regions from east to west presented an increasingly enhanced characteristics that the onset pentad of cold period postponed, the upset pentad advanced and the pentads shortened. Mutation point of the onset and upset pentad and pentads of cold period was respectively observed in 1990a, 1987a and 1993a and there were about 11 a mesoscale and 2a, 4a short time scale dominant period, coinciding with 2 -4a general atmospheric circum- fluence and 11 a sunspot activity cycle. The cold air, the Asia polar vortex area index and the Asia polar vortex intensity index were the main factors affecting the cold period of the study area. With the increase of latitude and longitude, the onset and upset pentad and pentads of cold period presented the trends of advancing, postponing and extending.

关 键 词：严寒期 成因 内蒙古 

分 类 号：P46[天文地球—大气科学及气象学]