摘要
使用东北林区156个气象观测站的1961-2008年逐日积雪深度资料,对该区积雪平均空间分布特征及时空变化规律进行详细分析。结果表明：东北林区自北向南、自东北向西南主要呈现出积雪初日逐渐推迟,积雪终日逐渐提前,积雪期、积雪日数逐渐增长,年最大积雪深度逐渐加深的空间分布特征;1961-2008年积雪初日以1.8天/10a的速度显著推迟,积雪终日明显提前,平均每10a提前1.9天,积雪期平均每10a缩短3.5天,积雪日数无明显趋势性变化,年最大积雪深度随时间变化呈不明显增加趋势;全区88%站点的积雪初日呈推迟趋势,积雪终日提前站点占总站点的95%,97%的区域积雪期呈缩短趋势,积雪日数缩短的地区占总区域的58%,71%地区的年最大积雪深度增加;积雪初日、积雪终日、积雪期、年最大积雪深度均在20世纪90年代发生突变,积雪日数未出现显著突变点,但均表现出2a、4a及6-8a的周期特征。
Based on daily snow depth data from 1961 to 2008 of 156 meteorological stations in the Northeast Forest,the spatial distribution and variations of snow cover were analyzed in detail. The results show that the first snow date gradually delayed,the last snow date gradually ended earlier,snow days and snow cover gradually increased,and maximum snow depth gradually deepened from north to south and from northeast to southwest in northeast forest region. The first snow date significantly delayed at the speed of 1. 8 d /10 a from 1961 to 2008,the last snow date significantly ended earlier,with an average 1. 9 days per 10 a,the snow days shortened by 3.5 days per 10 a on average,while snow cover showed no significant tendency. The maximum snow depth showed no obvious increasing trend. The first snow date showed delay trend in 88% stations of total meteorological stations,and the site with last snow date ending earlier accounted for 95%. The snow days shortened in about 97%area of the region,and the area with snow cover shortening accounted for 58%. The maximum snow depth increased in 71% area. The first snow date,the last snow date,snow days,and the maximum snow depth have an abrupt change in 1990 s,and snow cover had no significant change,but all showed 2a,4a and 6- 8a cycle characteristics.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2015年第1期154-162,共9页
Journal of Arid Land Resources and Environment
基金
林业公益性行业专项(200804001)
中国气象局2012年气候变化专项(CCSF201228)
2012年度公益性行业(气象)科研专项(201206024)资助
