摘要
以亚洲高山区为研究区,在对2000—2020年逐日MODIS积雪产品进行去云处理的基础上提取了每一水文年的积雪日数(snow-covered days,SCD)、积雪开始日期(snow onset date,SOD)、积雪结束日期(snow end date,SED)和积雪持续日数(snow duration days,SDD)等积雪物候参数,并分析了积雪物候时空动态特征及其与气候变化的响应关系。结果表明:亚洲高山区积雪物候空间差异较大,并呈现出主要受海拔影响的垂直地带性分布规律。研究区SED主要集中在3—6月,在低海拔区SED出现在3月份及以前,而高海拔山区则推迟到6月份及以后;SOD主要集中在9—12月,高海拔山脉及高纬度地区的SOD出现较早,而低海拔区的SOD多出现在11月及以后。近20年,研究区SDD主要呈缩短趋势,在13.5%的区域呈显著缩短,而仅7.4%的区域为显著延长;SED主要呈提前趋势,在15.8%的区域显著提前,而仅8.8%的区域为显著推迟;SOD主要呈推迟趋势,在11.4%的区域表现为显著推迟,在8.2%的区域为显著提前。亚洲高山区积雪物候年际变化对气候变化的响应关系明显,积雪累积期气温是影响SOD年际变化的主导因子,而融雪期气温是影响SED年际变化的主导因子;气温的上升,导致了SOD的推迟、SED的提前和SDD的缩短。
Snow cover is an essential parameter in the Earth’s energy budget and hydrological cycle.Snow cov⁃er in the High Mountain Asia provides a significant contribution to runoff in many populated areas,where it rep⁃resents a primary source of drinking water for billions of people across Asia and supports irrigation,the industry and energy production.Taking the High Mountain Asia as the study area,the cloud removal of the daily MODIS snow cover products during 2000—2020 is firstly carried out.On this basis,the snow-covered days(SCD),snow onset date(SOD),snow end date(SED)and snow duration days(SDD)for each hydrological year(from September 1 to August 31 in the next year)are extracted.Finally,the spatiotemporal dynamics of snow phenolo⁃gy and its response to climate change are analyzed.The following results are found:(1)The snow phenology in the High Mountain Asia shows a great spatial difference and a vertical zonality mainly influenced by the altitude.SED is mainly concentrated in March-June.In the low-altitude areas,SED appears in March or earlier,while it is delayed to June or later in the high-altitude mountainous areas.SOD is mainly concentrated in September-De⁃cember.SOD appears earlier in the high-altitude mountainous areas and high-latitude areas,while mainly ap⁃pears in November or later in the low-altitude areas.(2)During the 20-year period,SDD in the study area main⁃ly shows a shortening trend.Up to 13.5%of the area of SDD shows a significantly shortening trend,while only 7.4%of the area shows a significantly lengthening trend.SED in the study area mainly shows an advanced trend.Up to 15.8%of the area of SED shows a significantly advanced trend,while only 8.8%of the area is sig⁃nificantly delayed.SOD in the study area mainly shows a delayed trend.11.4%of the area show a significantly delayed trend,while 8.2%of the area is significantly advanced.(3)The interannual variation of snow phenolo⁃gy in the High Mountain Asia has an obvious response relationship to climate change,and shows different re⁃sponse degrees in different subregions.The temperature of snow accumulation period is the dominant factor af⁃fecting the interannual variation of SOD,and the temperature during snow melt period is the dominant factor af⁃fecting the interannual variation of SED.The increase of temperature leads to the delay of SOD,advance of SED and shortening of SDD.
作者
唐志光
邓刚
胡国杰
王欣
蒋宗立
桑国庆
TANG Zhiguang;DENG Gang;HU Guojie;WANG Xin;JIANG Zongli;SANG Guoqing(Hunan Provincial Key Laboratory of Geo-Information Engineering in Surveying,Mapping and Remote Sensing,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China;National-Local Joint Engineering Laboratory of Geo-spatial Information Technology,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)
出处
《冰川冻土》
CSCD
北大核心
2021年第5期1400-1411,共12页
Journal of Glaciology and Geocryology
基金
国家自然科学基金项目(41871058)
冰冻圈科学国家重点实验室开放基金项目(SKLCS-OP-2020-08)
湖南省教育厅科研项目(20B227)资助。
