摘要
在全球气候变暖背景下,青藏高原多年冻土发生着不同程度的退化,从而对区域气候、水文和生态过程产生了显著影响。文章在青藏高原多年冻土区长期观测资料的基础上,结合再分析资料,分析了近10年来多年冻土区气温和降水的变化特征,并对活动层厚度、地温和土壤含水量的变化趋势进行了研究。结果表明,近10年来青藏高原不同站点多年冻土发生了显著的变化,活动层厚度增加,地温升高以及活动层底部土壤含水量增加。从区域尺度来看,1980—2018年多年冻土区降水和土壤含水量呈现显著增加趋势。这些变化可能是导致青藏高原多年冻土区水文过程、湖泊面积变化和地表形变等的主要原因。结果有助于进一步认识多年冻土变化对区域环境的影响,可为冻土与水循环相互作用关系的机理研究提供思路,为寒区环境保护、工程设计和施工提供参考经验。
Under the background of global warming,permafrost on the Qinghai-Tibet Plateau has been experienced a significant degradation,which may have effects on regional climate,hydrological and ecological processes.Based on long-term observation data in permafrost region of Qinghai-Tibet Plateau and reanalysis data,the variation characteristics of temperature and precipitation in permafrost region in recent ten years were analyzed,and the variation trends of active layer thickness,ground temperature and soil water content were examined in this study.The spatial and temporal distribution of precipitation and soil water content in permafrost region from 1980 to 2018 were presented.The results showed that the permafrost in different regions on the Qinghai-Tibet Plateau has changed significantly in the past ten years.The thickness of the active layer and the ground temperature has increased,and the soil water content at the bottom of the active layer has increased.At the regional scale,the precipitation and soil water content in permafrost region increased significantly from 1980 to 2018.The possible impacts of permafrost degradation on hydrological processes,lake area changes and surface deformation were discussed.The results are helpful to understand the impact of permafrost changes on regional environment,deepen our understanding of the mechanisms of the interaction between permafrost and water cycle,and provide a scientific basis for environmental protection,engineering design and construction in cold regions.
作者
赵林
胡国杰
邹德富
吴晓东
马露
孙哲
原黎明
周华云
刘世博
ZHAO Lin;HU Guojie;ZOU Defu;WU Xiaodong;MA Lu;SUN Zhe;YUAN Liming;ZHOU Huayun;LIU Shibo(School of Geographical Sciences,Nanjing University of Information Science&Technology,Nanjing 210044,China;Cryosphere Research Station on Qinghai-Xizang Plateau,State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《中国科学院院刊》
CSSCI
CSCD
北大核心
2019年第11期1233-1246,共14页
Bulletin of Chinese Academy of Sciences
基金
中国科学院战略性先导科技专项（A类）(XDA20020000)
关键词
多年冻土
活动层
温度
土壤含水量
降水
permafrost
active layer
temperature
soil moisture content
precipitation
