沙漠与绿洲气象Issue(3)：7-13,7.DOI:10.3969/j.issn.1002-0799.2015.03.002
近10 a西藏高原雪线时空变化及其与气象因素关系分析
Spatial and Temporal Variation of Snow Line and Its Relationships with Meteorological Factors in Tibet Plateau in Recent 10 Years
摘要
Abstract
Using MODIS snow cover data from March 2000 to February 2011, DEM and climate data from surface meteorological stations in Tibet Plateau, the spatial and temporal variations of snow line over the different natural divisions in Tibet Plateau and its relationships with meteorological factors were analyzed with the spatial and statistics analysis function of GIS. The results indicated that snow line over Tibet and all different natural divisions in recent 10 years showed a stable and slight upward trend, but the trend was not significant, increasing rate reached 6.45 m/10 a,and regional annual average snow line was 4 848.6 m. Among the four seasons, autumn mean snow line contributed the most to the annual one with the correlation coefficient between them reached to 0.796. Snow line which declined with the correlation coefficient for-0.625 in winter, was characterized by rising trend in the other three seasons, but all trends were not significant. The monthly changes of snow line of montane evergreen broad-leaved forest in south side of eastern Himalayas fluctuated obviously with standard deviation reaching 60.3 m, in the rest of natural divisions in Tibet Plateau they were characterized by gentle fluctuation situation. The snow line over Tibet Plateau escalated from the southeast to the northwest, while the distribution of snow line was dense and complicated in the southeast and northwest of Tibet, furthermore, high and low value areas respectively corresponded to mountains and valleys. Overall, snow line was positively correlated with temperature while negatively correlated with precipitation in Tibet Plateau, however, there were differences in the relationships between snow line and climate factors (temperature and precipitation)over the different natural divisions in four seasons.关键词
西藏高原/雪线/气象因素/时空特征Key words
Tibet Plateau/snow line/meteorological factors/spatial and temporal characteristics分类
天文与地球科学引用本文复制引用
史建桥,白淑英,高吉喜,顾海敏..近10 a西藏高原雪线时空变化及其与气象因素关系分析[J].沙漠与绿洲气象,2015,(3):7-13,7.基金项目
环保部公益性行业科研专项项目（201209029-1）。 （）
