近30年来我国雪量变化的初步探讨

A PRELIMINARY STUDY OF SNOW MASS VARIATIONS OVER PAST 30 YEARS IN CHINA

中文摘要:

      本文根据2300多个地面气象台站资料,对近30年来我国雪量波动进行了监测与诊断研究。发现全国尺度的雪量变化趋势与全球平均气温成正相关,其年际波动与火山活动相位相反,多雪冬季与厄尼诺-南方涛动相同步。CO₂增温将加剧雪量分布的区域差异,导致北方平原、盆地积雪日数减少,青藏高原、高山地区和长江中下游降雪量增加。

英文摘要:

      Daily ground data including complet records on snowfall,snow depth,and snow cover duration from more than 2300 weather stations between 1951 and 1980 have been used to monitor and diagnose snow mass variations in China.The time series analysis suggests that both annual snowfall amount and winter snowpack storage are positively correlated with the global mean temperature,increasing during the warming period and decreasing during the cooling period.The heavier-than-normal snow appears to be associated with El Ninc-Southern Oscillation,whereas the lighter-than-normal snow is linked to the large voicanic eruptions.The CO₂-induced changes in seasonal snow might aggravate the trend of regional differentiation of snow between high mountains and low lands as well as between moist and arid areas.