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An analysis of snow cover changes in the Himalayan region using MODIS snow products and in-situ temperature data

机译：利用MODIS积雪和原位温度数据分析喜马拉雅地区积雪的变化

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Amidst growing concerns over the melting of the Himalayas’ snow and glaciers, we strive to answer some of the questions related to snow cover changes in the Himalayan region covering Nepal and its vicinity using Moderate Resolution Imaging Spectroradiometer (MODIS) snow cover products from 2000 to 2008 as well as in-situ temperature data from two high altitude stations and net radiation and wind speed data from one station. The analysis consists of trend analysis based on the Spearman’s rank correlation on monthly, seasonal and annual snow cover changes over five different elevation zones above 3,000 m. There are decreasing trends in January and in winter for three of the five elevation zones (all below 6,000 m), increasing trends in March for two elevation zones above 5,000 m and increasing trends in autumn for four of the five elevation zones (all above 4,000 m). Some of these observed trends, if continue, may result in changes in the spring and autumn season river flows in the region. Dominantly negative correlations are observed between the monthly snow cover and the in-situ temperature, net radiation and wind speed from the Pyramid station at 5,035 m (near Mount Everest). Similar correlations are also observed between the snow cover and the in-situ temperature from the Langtang station at 3,920 m elevation. These correlations explain some of the observed trends and substantiate the reliability of the MODIS snow cover products.
机译：在越来越多的人关注喜马拉雅山脉的雪和冰川融化的过程中，我们努力使用从2000年到2000年的中分辨率成像分光辐射计（MODIS）积雪产品来回答涉及尼泊尔及其周边地区的喜马拉雅地区积雪变化的一些问题。 2008年以及两个高海拔站的现场温度数据以及一个站的净辐射和风速数据。该分析包括基于Spearman等级相关性的趋势分析，该相关性针对3000 m以上的五个不同海拔区域的月，季和年积雪变化。五个海拔区域中的三个（均在6,000 m以下）的一月和冬季趋势呈下降趋势，三个海拔区域大于5,000 m的两个高程区域在三月的趋势呈上升趋势，五个海拔区域中的四个（均大于4,000 m）的秋季呈上升趋势m）。这些观察到的趋势如果继续下去，可能会导致该地区春季和秋季的河流流量发生变化。观测到的每月积雪与金字塔台站5,035 m（珠穆朗玛峰附近）的原地温度，净辐射和风速之间存在显着负相关。在海拔3,920 m的郎塘站，积雪与实地温度之间也观察到类似的相关性。这些相关性解释了一些观察到的趋势，并证实了MODIS雪盖产品的可靠性。

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