中国区域降雪量和降雪频率对沙尘天气的影响作用分析  

Impact of Snowfall Amount and Snowfall Frequency on Sand-Dust Events in China

作　　者：徐兴奎[1] 王小桃[1,2] 周广庆[1] 

机构地区：[1]中国科学院大气物理研究所国际气候和环境科学中心,北京100029 [2]中国科学院研究生院地球科学学院,北京100049

出　　处：《中国沙漠》2011年第5期1293-1301,共9页Journal of Desert Research

基　　金：国家自然科学基金项目(40675047);国家重点基础研究发展计划(2006CB403607);中国科学院创新项目(KZCX2-YW-219)资助

摘　　要：1970—2000年间气象台站降雪量和沙尘天气统计结果显示,在中国冬春季主要积雪覆盖区域,沙尘天气发生频次相对较低,各类沙尘天气基本发生在积雪覆盖率低、年降雪量少的区域。时间序列分析结果进一步显示,年降雪量和沙尘天气之间存在显著的负相关,降雪量的增多对沙尘天气的年发生次数具有明显的抑制作用。同时,年降雪频率也是影响沙尘天气爆发频次的重要因素之一。对于中国西北干旱少雪的地区,尤其体现在新疆北部地区,年降雪频率的增加能够显著地减少各类沙尘天气的发生次数。The statistical results of meteorological data during 1970-2000 show that the sand-dust events frequency is relatively low in areas with snow cover in winter and spring in China,and the sand-dust events mainly occurs in areas with low snow coverage and snowfall amount.There is a significantly negative correlation between annual snowfall amount and sand-dust events frequency.Increase of annual snowfall amount decreases annual sand-dust events frequency obviously.Meanwhile,snowfall frequency is also an important influence factor on sand-dust events frequency.In arid regions of Northwestern China with less snowfall,especially in the northern part of Xinjiang,the frequency of sand-dust events reduces with increasing of snowfall frequency.

关 键 词：沙尘天气 降雪量 降雪频率 地表覆盖 

分 类 号：P445.4[天文地球—大气科学及气象学]