摘要
利用1999—2008年地面积雪观测资料,对全国范围内的雪密度时空分布特征进行分析.结果表明,西北和东北是我国主要的积雪区,从10月到翌年4月基本都有雪存在.全国雪密度每月的最高值从10月份开始到1月份一直南移,从1月份到4月份不断北移.最大密度发生在1月份江南地区的湖南和江西的交界处.江南地区积雪持续时间短,变化明显,属于瞬时性积雪.东北和新疆地区的雪密度也相对较高,积雪持续时间长,雪密度变化相对平稳,大部分属于季节性积雪.在东北和西北地区选取9个站点进行雪密度的变化研究,可以看出:从11月中旬到3月上旬是雪密度稳定期,10月到11月上旬和3月中旬到4月是雪密度非稳定期.对西北和东北的降水、气温、雪深和雪密度做相关分析,表明:雪深是西北和东北地区雪密度的主要贡献因子.
Ground observation data of snow from 1999 to 2008 are used to analyze the temporal and spatial distribution of snow density in China.The maximum monthly density moves from north to south from October to the following January,and then moves back from south to north from January to April.The maximum density takes place at the border between Hunan and Jiangxi provinces in January,where the duration of snow cover is short and varies remarkably.The snow density in Northeast China and Xinjiang Region is also high,where duration of snow cover is long,with less density variation.Nine stations were selected to study the changes of snow density in Northeast China and Northwest China.It is found that there is a stationary phase of snow density from the middle ten days of November to the following February and a non-stationary phase from October to the first ten days of November and from March to April.In order to further investigate the impacts of climate factors on snow density,the correlations between snow density and precipitation,air temperature,snow depth and wind velocity were analyzed in Northeast China and Northwest china,respectively.In Northwest China and Northeast China snow depth is the main contribution to snow density.
出处
《冰川冻土》
CSCD
北大核心
2010年第5期861-866,共6页
Journal of Glaciology and Geocryology
基金
国家重点基础研究发展计划(973计划)项目(2007CB411506)
国家自然科学基金项目(40601065
40971188)
气象科研专项(GYHY200706018)资助
关键词
积雪
密度
时空分布
snow
snow density
spatio-temporal distribution
