摘要
利用MOD10A1积雪产品逐像元提取积雪覆盖率、积雪日数、初雪日期、终雪日期,分析2000~2017年间蒙古高原各积雪参数的分布特征、变化及其与气温、降水的关系,为蒙古高原长期生态环境保护和应对全球变化制定适应对策提供参考依据。研究结果表明:(1)蒙古高原积雪覆盖率介于24~47%之间,且呈现"北部多南部少"的分布特点。积雪覆盖率最大出现在2002年,为46.02%;最小出现在2014年,为24.72%;1月份积雪覆盖率最大,为46.04%。积雪日数在46~82d之间,且呈现"北部长南部短"的分布特点,西北局部地区可达140d以上。积雪覆盖率和积雪日数以不明显的减少趋势为主,但西北部蒙古阿尔泰山、杭爱山,东部呼伦贝尔、锡林郭勒北侧和大兴安岭西侧小部分地区呈显著增长趋势。初雪日期北部出现早,南部晚,分布在第317~343d之间。终雪日期北部出现晚,南部早,分布在第45~63d之间。初雪日期和终雪日期均有不同程度的提前。(2)初步研究表明气温变化对积雪影响程度大于降水变化的影响。(3)整体上,蒙古高原积雪覆盖率随海拔升高而增大,但小尺度范围内,不同海拔地区积雪覆盖率变化多样。
Based on MOD10 A1 in Mongolian Plateau(MP), data of snow cover fraction(SCF), snow cover days(SCD), snow cover onset date(SCOD), snow cover end date(SCED) were extracted from 2000 to 2017 in the present study. The spatiotemporal distribution characteristics and changes of snow accumulation and their relationship with temperature and precipitation were further analyzed to provide a scientific basis for making policy for long-term ecological protection and adaptation to climate change. The results showed that SCF of MP was ranged from 24% to 47% that the distribution was characterized by "more in the north and less in the south". The largest SCF was in 2002 with a value of 46.02%, while it was the smallest in 2014 with a value of 24.72%. For monthly SCF, January had the largest value(46.04%). SCD was ranged from 46 to 82 d with a characteristic of "long duration in the north and short duration in the south", in which SCD can reach more than 140 days in some areas of northwestern MP. SCF and SCD showed a non-significant decreasing tendency in most areas of MP. However, a significant increasing tendency of SCF and SCD was observed in Mongolian Altai Mountains and Hangay Uul in northwestern MP and Hulunbeir, north Xilingol and a small part of west Greater Khingan of MP. SCOD was ranged from 317 to 343 d that it appeared earlier in north areas compared with that in south areas. Furthermore, the condition was opposite for SCED, which was ranged from 45 to 63 d. Both of SCOD and SCED were non-significant ahead of time. It can be concluded that snow accumulation was more depended on temperature rather than precipitation. Overall, SCF of MP was increased with elevation of altitude. However, the change of SCF may be varied among different altitudes in a small range.
作者
李晨昊
萨楚拉
刘桂香
王牧兰
孟凡浩
包玉龙
LI Chen-hao;Sachula;LIU Gui-xiang;WANG Mu-lan;MENG Fan-hao;BAO Yu-long(College of Geographical Science,Inner Mongolia Normal University,Hohhot 010022,China;Inner Mongolia Key Laboratory of Disaster and Ecological Security on the Mongolia Plateau,Inner Mongolia Normal University,Hohhot 010022,China;Inner Mongolia Key Laboratory of Remote Sensing and Geographic Information System,Inner Mongolia Normal University,Hohhot 010022,China;Grassland Research Institute of Chinese Academy of Agricultural Sciences,Hohhot 010010,China)
出处
《中国草地学报》
CSCD
北大核心
2020年第2期95-104,共10页
Chinese Journal of Grassland
基金
国家自然科学基金项目(41861014)
中国农业科学院草原研究所科技创新工程草原非生物灾害防灾减灾团队(CAASASTIP-2016-IGR-04)
内蒙古科技计划项目(201702116)。
关键词
蒙古高原
积雪
时空变化
气候响应
MODIS
Mongolian Plateau
Snow cover
Spatiotemporal changes
Climate response
MODIS
