摘要
利用美国冰雪数据中心提供的8d合成MODIS积雪数据以及定日县气象站观测的年平均气温、年降水量和年蒸发量资料,分析了2001-2010年喜马拉雅山珠穆朗玛峰自然保护区域积雪覆盖的时空分布变化特征以及气候影响因子,积雪特征包括年变化、季节变化和永久性积雪的变化.结果表明:珠穆朗玛峰地区积雪覆盖面积呈减少趋势,10a来减少约323km2的覆盖面积,特别是2005年以后积雪覆盖面积减少尤为明显;永久性积雪面积减少了85km2;2006年开始积雪基本上每年都在递减且减少幅度很大;积雪具有明显的季节性变化,积雪覆盖面积最大值出现在2月份左右,最小值出现在8月份;积雪覆盖面积的空间分布范围在逐渐变小,积雪主要分布在珠穆朗玛峰自然保护区的中部和东部;积雪覆盖面积与年平均气温呈负相关关系.
In this paper, the temporal and spatial distribution of snow cover and its climatic influencing factors, such as annual mean air temperature, annual precipitation and annual evaporation, in the Qomolangma Natural Reserve of the Himalayas during 2001-2010 is investigated based on the 8 days composited MODIS snow cover dataset from Snow and Ice Data Center of America along with the meteorological observation at Tingri Station. The snow characteristics, including annual variation, seasonal variation and permanent snow variation, are analyzed. It is found that the snow cover exhibits an obvious decreasing trend, about 323 km2 decreased in the past ten years, especially from 2005. The coverage of permanent snow has great decreased, especially from 2006, with an area decrease of about 85 km2. The snow cover has evident seasonal variation, namely with a maximum in February and a minimum in August. Spatially, distribution of snow cover has become narrow gradually in the past decade and the narrowed areas are mainly located in the middle and eastern parts of the Qomolangma Natural Reserve. Furthermore, the snow cover is negatively related to annual mean air temperature.
出处
《冰川冻土》
CSCD
北大核心
2013年第5期1103-1111,共9页
Journal of Glaciology and Geocryology
基金
公益性行业(气象)科研专项(GYHY201206040
GYHY201006054)
中国气象局项目(CMAGJ2013M51)
2013年西藏气象局局设项目资助
关键词
珠穆朗玛峰自然保护区
积雪
时空分布
MODIS
Qomolangma Natural Reserve snow cover temporal and spatial distribution MODIS
