摘要
利用1960—2018年河西走廊东部5个气象观测站逐日降雪量资料,运用线性回归、均方差、相关系数等方法,分析了该区域降雪量的时空变化特征及其与大气环流的关系。结果表明,河西走廊东部降雪量具有明显地域特征,降雪量的均值和极值均为山区多于绿洲平原区,绿洲平原多于荒漠干旱区。除古浪县外,年及年代降雪量呈增多趋势,天祝县降雪量增多趋势明显。降雪主要在春、秋、冬季,春、冬季降雪量呈增多趋势,秋季降雪量呈减少趋势。各地年降雪量的异常性比较一致,正常年份最多,发生概率为62.7%~72.9%,依次向两端迅速递减。印度副热带高压面积、西太平洋副热带高压面积、东亚槽强度分别对同季春、秋、冬季降雪量的影响最明显;亚洲经向环流、北半球极涡强度和东亚槽强度分别对下一季春、冬季降雪量的影响最明显。
Using daily snowfall of five meteorological stations in eastern Hexi corridor during 1960—2018,spatial and temporal variation characteristics of snowfall and its relationship with atmospheric circulation were analyzed in this region with linear regression,mean square deviation and correlation coefficient method.The results showed that snowfall of eastern Hexi corridor had obvious regional characteristics,average and extreme value of snowfall was more in mountain area than in oasis plain,and that was more in oasis plain than in desert area.Snowfall of year and age also assume increasing trend except Gulang county,increasing trend of Tianzhu county was the most obvious.Snowfall was mainly in spring,autumn and winter,snowfall was increasing in spring and winter,while was decreasing in autumn.Anomaly of year snowfall was more consistent,normal years was the most,occurrence probabilities were in 62.7%~72.9%,and in turn to both ends of decline.Influences of Indian subtropical high area,western Pacific subtropical high area and east Asian trough intensity on snow in same spring,autumn and winter were the most obvious,respectively.Influences of Asia meridional circulation,northern hemisphere polar vortex intensity and east Asia trough intensity on snow in next spring and winter were the most obvious,respectively.
作者
杨晓玲
孙占锋
李岩瑛
王胜
YANG Xiao-ling;SUN Zhan-feng;LI Yan-ying;WANG Sheng(Wuwei Meteorological Bureau,Wuwei 733099,Gansu,China;Lanzhou Institute of Arid Meteorology,China Meteorological Administration,Lanzhou 730020,China)
出处
《湖北农业科学》
2021年第18期36-41,共6页
Hubei Agricultural Sciences
基金
国家自然科学重点基金项目(41630426)
干旱气象科学基金项目(IAM202016)
武威市科研项目(WW190103)。
关键词
降雪量
变化特征
大气环流
相关性
河西走廊东部
snowfall
variation characteristic
atmospheric circulation
correlation
eastern Hexi corridor
