2000-2014年西藏雅鲁藏布江流域积雪时空变化分析及对气候的响应研究  

Spatiotemporal variations of snow cover over Yarlung Zangbo River basin in Tibet from 2000 to 2014 and its response to key climate factors

作　　者：刘金平 张万昌 邓财[3] 聂宁[3] LIU Jinping;ZHANG Wanchang;DENG Cai;NIE Ning(Institute of Remote Sensing and Digital Earth,Chinese Academy of Sciences,Beijing 100094,China;University of the Chinese Academy of Sciences,Beijing 100049,China;School of Environment,Nanjing University,Nanjing 210093,China)

机构地区：[1]中国科学院遥感与数字地球研究所,北京100094 [2]中国科学院大学,北京100049 [3]南京大学环境学院,江苏南京210093

出　　处：《冰川冻土》2018年第4期643-654,共12页Journal of Glaciology and Geocryology

基　　金：国家重点研发计划(2016YFA0602302;2016YFB0502502)资助

摘　　要：利用2000-2014年MODIS逐日无云积雪产品对雅鲁藏布江流域积雪特征的空间分布及变化、积雪随高程变化的规律进行了分析,并采用被动微波数据SMMR(1979-1987年)和SSM/I(1988-2008年)以及中国地面降水和气温0. 5°×0. 5°日值格点数据集,研究了雅鲁藏布江流域关键积雪参数对气候要素的响应等。结果表明:流域下游积雪日较大且变化剧烈;流域整体上呈显著减少的趋势;积雪日随高程的上升而增加;流域内降水呈不显著的增加趋势,而气温呈显著的增加趋势,最高气温对积雪变化影响最大;气温对积雪终日的影响明显高于积雪初日;在积雪消融期降水的增多促进了积雪的消融。The improved MODIS daily snow-cover dataset processed by cloud-removal algorithm was used to investigate the spatio-temporal snow-cover variations from 2000 to 2014 over the Yarlung Zangbo River basin.Then the key snow cover parameters,such as snow-cover days（ SCD）,start of snow-cover days（ SCS）,melt out of snow-cover days（ SCM）,as functions of elevation were analyzed to study the correlations betw een snow-cover and elevation. Long term snow-cover dataset derived from the passive microw ave data of SMMR（ 1979-1987） and SSM/I（ 1988-2008）,and the China daily precipitation/temperature analysis products derived from National Meteorological Information Center（ NMIC） were used to analyze the responses of key snow-cover parameters to climatic factors. The results suggested that： except the broad-leaved forest regions in the eastern Himalayas,the value of SCD over the dow nstream of the Yarlung Zangbo River had been large and the inter-annual variations of SCD had been also severe; the area decreasing trend of SCD had predominated rather than increasing trend from 1979 to 2008 over the basin; SCD had positively correlated with altitude（ R2= 0. 90,P 〈 0. 01）;precipitation over the basin had not significantly increased,w hile temperature had significantly increased at a level of 0. 001,and the maximum temperature had impacted mostly on the snow-cover variation; the influence of air temperature on SCMhad been significantly higher than that on SCS; the increase of precipitation had promoted the ablation of snow in snow melting season.

关 键 词：MODIS 积雪 被动微波数据 气候要素 雅鲁藏布江流域 

分 类 号：P426.635[天文地球—大气科学及气象学]