摘要
青藏高原大部分湖泊近年来持续扩张,湖泊水位和水量明显增加.冰川消融是流域水量平衡和水循环的重要影响因素,直接导致湖泊水量变化.由于缺乏大范围的冰川质量平衡观测结果,青藏高原冰川消融对湖泊水量变化的影响仍存在较大争议.本文选择青藏高原内流区的色林错流域区(水系编号5Z2)作为研究对象,利用SRTM DEM和TanDEM-X双站InSAR数据,精确估算该流域三个主要冰川区(普若岗日、格拉丹东和西念青唐古拉)2000—2012年的冰川质量平衡,依次为:-0.020±0.030、-0.128±0.049、-0.143±0.032m·w.e.·a^(-1).并据此采用面积加权法准确推估出5Z2流域的冰川质量变化为:-0.166±0.021Gt·a^(-1).综合ICESat和Cryosat-2卫星测高数据,计算该流域2003—2012年湖泊水量变化速率(3.006±0.202Gt·a^(-1)),并定量评估冰川质量变化对5Z2流域湖泊水量增加的贡献为:5.52%±1.07%,因此在青藏高原色林错流域区,冰川消融不是导致21世纪初期湖泊水位上升的主要因素.
During recent decades, most lakes in the Tibetan Plateau (TP) expanded significantly, exhibiting a continuous increment of size, level and volume. Glacier melting which is one of the most important influencing factors of basin′s water balance and hydrological cycle can directly cause lake volume change. However, it remains a controversial issue on the contribution of glacier mass loss to lake volume change in the TP due to lack of large-scale observations of glacier mass balances. In this study, we exploited the SRTM DEM and TanDEM-X bistatic InSAR data sets to estimate the glacier mass balances of three main glacierized regions in the Siling Co watershed (No.5Z2) of the endorheic basin of the TP. The results of the three primary glacial areas, i.e. Puruogangri, Geladandong and Western Nyainqêntanglha, between 2000 and 2012 are -0.020±0.030,-0.128±0.049 and -0.143±0.032 m·w.e.·a^-1 , respectively. Furthermore, glacier mass budget of -0.166± 0.021 Gt·a ^-1 in the 5Z2 sub-basin was well estimated by extrapolating the above results of glacier mass balances. Finally, combined with the resultant lake volume change (3.006±0.202 Gt·a ^-1 ) in the period 2003-2012 from ICESat and Cryosat-2 observations, we found that the contribution of glacier mass changes to lake level rise in the 5Z2 sub-basin is only 5.52%±1.07% in the beginning of the 21st century. This finding indicates that glacier melting is not the main driving force of lake level rise in this endorheic sub-basin of the Tibetan Plateau.
作者
柳林
江利明
相龙伟
汪汉胜
孙亚飞
许厚泽
LIU Lin;JIANG LiMing;XIANG LongWei;WANG HanSheng;SUN YaFei;XU HouZe(Institute of Geophysics, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China;State Key Laboratory of Geodesy and Earth′s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;Center for Gravitational Experiment, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China;University of Chinese Academy of Sciences, Beijing 100049, China)
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2019年第5期1603-1612,共10页
Chinese Journal of Geophysics
基金
国家重点研发计划(2017YFA0603103)
国家自然科学基金(41431070
41704023
41590854
41621091
41501497)
中国博士后科学基金(2017M622452)
中国科学院前沿科学重点研究(QYZDB-SSW-DQC027
QYZDJ-SSW-DQC042)联合资助
