一种基于MODIS积雪产品的雪线高度提取方法  

A method for extracting snow line altitude based on MODIS snow product

作　　者：鲍伟佳[1,2] 刘时银[1,3] 吴坤鹏[1,2] 王荣军[1,2] 蒋宗立[4] 

机构地区：[1]中国科学院西北生态环境资源研究院冰冻圈科学国家重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049 [3]云南大学国际河流与生态安全研究院,云南昆明650091 [4]湖南科技大学煤炭资源清洁利用与矿山环境保护湖南省重点实验室,湖南湘潭411201

出　　处：《冰川冻土》2017年第2期259-272,共14页Journal of Glaciology and Geocryology

基　　金：科技部基础性工作专项(2013FY111400);中科院重点部署项目(KZZD-EW-12-1);国家自然科学基金重点项目(41130641);国家自然科学基金项目(41471067)资助

摘　　要：冰川雪线高度的遥感提取对冰川物质平衡研究具有重要意义。提出一种基于晴空环境下积雪覆盖频率的雪线高度提取方法。使用MOD10A1积雪产品中的像元积雪面积比例数据,提取了2000/2001-2014/2015年间高亚洲地区冰川消融期末雪线高度。使用实测的冰川年物质平衡资料和气象格网数据对提取的雪线高度变化的可信度进行分析。研究表明:近15 a高亚洲雪线高度变化及趋势具有明显的东西差异,雪线高度变化幅度自青藏高原内部地区向四周呈增加趋势,西部大于东部。提取的冰川雪线高度变化与观测的年物质平衡序列具有很高的相关性,对物质平衡波动的平均解释率可高达75%;与气象要素(气温、降水)的年际变化的相关性也较高,约61.58%的格网冰川雪线高度变化可以由夏季气温和季节降水解释。而高亚洲各分区冰川雪线高度的波动规律也与大气环流背景分布一致。因此提取的雪线高度变化具有冰川学意义,可以进一步应用于冰川物质平衡估算及模拟研究中。The snow line altitude extraction is very important for studying glacier mass balance.A method was presented to calculate the snow line altitude in mountain areas based on MOD10A1 snow product by using the snow cover frequency in the clear-sky days in hydrological years.The fractional snow cover data were used to class the snow line or above snow line pixels.In this paper,snow line altitudes of glaciers in High Mountain Asia at the end of ablation periods between 2000/2001 to 2014/2015 were extracted.The result shows that the extracted snow line attitude time series are very high correlated with the observed annual glacier mass balance series.75% of mass balance change could be explained by snow line altitude variation.About 61.58% snow line altitude change has significant relationship with summer air temperature or seasonal precipitation in the 30 km grid scale.Finally,the sub-regional snow line altitude time series seems to illuminate that the snow line altitude in the whole High Mountain Asia has changed in recent 15 years.The snow line altitude change has associated with the distribution of atmospheric circulations in high Mountain Asia.The snow line altitude extraction method proposed here could be applied to research glaciers in the other mountains.

关 键 词：高亚洲冰川 雪线高度 MODIS积雪产品 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] P426.635[自动化与计算机技术—控制科学与工程]