基于Google Earth Engine的北半球积雪时空动态研究  

Spatial-temporal dynamic of snow cover in the Northern Hemisphere by Google Earth Engine

作　　者：孙中太 张佳华 王霄鹏 李帅帅 李咏沙 张莎 白雲 SUN Zhongtai;ZHANG Jiahua;WANG Xiaopeng;LI Shuaishuai;LI Yongsha;ZHANG Sha;BAI Yun(School of Computer Science and Technology,Qingdao University,Qingdao 266071,China;Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]青岛大学计算机科学技术学院,山东青岛266071 [2]中国科学院空天信息创新研究院,北京100094

出　　处：《海洋湖沼通报(中英文)》2025年第1期105-114,共10页Transactions of Oceanology and Limnology

基　　金：中国科学院战略先导项目A(XDA19030402);国家自然科学基金(41871253)。

摘　　要：积雪调节了北半球大部分地区的水循环和能量交换,研究北半球积雪持续时间、积雪面积及积雪物候的时空动态具有重要意义。本研究基于Google Earth Engine云平台,利用MODIS卫星数据对2000―2019年北半球积雪覆盖频率和积雪面积的时空变化特征,以及积雪物候的大尺度变化和贡献进行研究分析。结果表明:北半球积雪变化趋势存在着明显的年际和区域性差异,积雪覆盖频率在欧亚大陆(55°~65°N,30°~120°E)附近地区、蒙古高原、斯塔诺夫高原和格陵兰岛以0.4~0.6(d/a)的速率下降;北半球春冬季节积雪面积下降明显,平均每年冬季下降趋势达到了1.9×10^(5)km^(2);哈萨克斯坦附近地区和北美洲中部平原地区积雪持续日数显著增加,平均每年增加1.1 d;北半球积雪物候变化主要归因于积雪结束日期的变化,二者相关性达到0.89;从区域对北半球积雪物候变化的贡献分析表明,北半球积雪物候变化主要是由欧亚大陆积雪物候变化主导的,贡献率达到60%左右。Snow cover regulates the water cycle and energy exchange in most parts of the Northern Hemisphere(NH).It is important to study the temporal and spatial dynamic snow cover frequency(SCF),snow cover area(SCA)and snow cover phenology(SCP)in the NH.Based on Google Earth engine cloud platform and MODIS satellite data,this study analyzed the temporal and spatial variation characteristics of SCF and SCA in the NH from 2000 to 2019,as well as the large-scale variation and contribution of SCP.The results showed that there were obvious interannual and regional differences in the variation trend of SCA in the NH.The SCF decreased at the rate of 0.4~0.6(d/a)near Eurasia(55°~65°N,30°~120°E),Mongolia Plateau,Stanov Plateau and Greenland.The SCA in spring and winter in the NH decreased significantly,and the average annual downward trend in winter reached 1.9×105 km^(2).The number of snow cover duration days increased significantly in areas near Kazakhstan and the Central Plains of North America,with an average annual increase of 1.1d.The change of SCP was mainly due to the change of snow cover end date,and the correlation between them was 0.89.The analysis of regional contribution to the change of SCP in the NH showed that the change of SCP in the NH was mainly dominated by the change of SCP in Eurasia,and the contribution rate was about 60%.

关 键 词：积雪覆盖 积雪物候 MODIS 时空变化 北半球 Google Earth Engine 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]