| 1901—2018年三江源地区大气冻融指数变化特征 |
| |
| 引用本文： | 陈方方,罗栋梁,刘磊,金会军,李超.1901—2018年三江源地区大气冻融指数变化特征[J].冰川冻土,2021,43(2):417-426. |
| |
| 作者姓名： | 陈方方 罗栋梁 刘磊 金会军 李超 |
| |
| 作者单位： | 中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000;中国科学院大学,北京100049;中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000;中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000;东北林业大学土木工程学院寒区科学与工程研究院,黑龙江哈尔滨150040;兰州交通大学测绘与地理信息学院,甘肃兰州730070 |
| |
| 基金项目： | 国家重点研发计划项目(2017YFC0405700);国家自然科学基金项目(41671060) |
| |
| 摘 要： | 三江源地区是我国重要生态安全屏障，冻土是其高寒生态系统的重要组成部分，冻土的变化深刻影响高寒生态系统固碳及水源涵养。基于英国东英吉利大学（University of East Anglia，UEA）气候研究中心（Climatic Research Unit，CRU）月平均气温再分析资料，利用线性倾向法和滑动平均法并结合GIS空间分析和制图，计算并分析了三江源地区1901—2018年冻融指数变化趋势及其空间分布特征。结果表明：三江源地区冻结指数在1901—2018年整体以-1.1 ℃·d·a-1的斜率呈波动减少趋势，经历了三个波动变化阶段：1901—1943年的下降（-3.4 ℃·d·a-1）、1943—1966年的升高（8.8 ℃·d·a-1）、1966—2018年的再次下降（-4.3 ℃·d·a-1）。融化指数与冻结指数的变化相反，整体以0.34 ℃·d·a-1的斜率呈波动上升趋势，呈现升高（1901—1943年，3.3 ℃·d·a-1）、下降（1943—1981年，-3.1 ℃·d·a-1）、再次升高（1981—2018年，2.9 ℃·d·a-1）的趋势。在空间分布上，自西向东随海拔和多年冻土连续性降低，冻结指数由3 400 ℃·d递减到600 ℃·d，融化指数由接近0 ℃·d增加到1 800 ℃·d。长江源区冻结指数最大，融化指数最小；黄河源区冻结指数最小，融化指数最大。研究成果可为三江源地区冻土变化及其对高寒生态环境的影响研究提供科学借鉴。
|
| 关 键 词： | 三江源地区 多年冻土 大气冻融指数 时空变化 CRU TS4.03数据集 |
| 收稿时间： | 2020-07-02 |
| 修稿时间： | 2021-01-27 |
Variations of air freezing/thawing index during 1901—2018 in the Three-River Source Region |
| |
| CHEN Fangfang,LUO Dongliang,LIU Lei,JIN Huijun,LI Chao.Variations of air freezing/thawing index during 1901—2018 in the Three-River Source Region[J].Journal of Glaciology and Geocryology,2021,43(2):417-426. |
| |
| Authors: | CHEN Fangfang LUO Dongliang LIU Lei JIN Huijun LI Chao |
| |
| Institution: | 1.State Key Laboratory of Frozen Soil Engineering，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China;2.University of Chinese Academy of Sciences，Beijing 100049，China;3.School of Civil Engineering，Northeast Forestry University，Harbin 150040，China;4.Faculty of Geomatics，Lanzhou Jiaotong University，Lanzhou 730070，China |
| |
| Abstract: | The Three-River Source Region （TRST） includes the source regions of the Yangtze River， the Lantsang River， and the Yellow River. It has become an important ecological security barrier for China due to special location， abundant natural resources， and important ecological functions. Permafrost is essential to the alpine ecosystem in the TRST as it influences carbon sequestration， water conservation and the stability of ecological environment in cold regions. The changes of permafrost represented by the spatial and temporal variations of freezing/thawing index was considered an important influence on the alpine ecological environment. However， the long-term variation of freezing and thawing indices in the TRSR has not been fully studied over the past due to the sparse and uneven distribution of meteorological stations and observation sites. In this study， based on the monthly average temperature reanalysis data from the University of East Anglia Climatic Research Unit （CRU TS 4.03）， the temporal variation and spatial distribution characteristics of freezing and thawing indices during 1901—2018 in the TRSR were calculated and analyzed using the linear tendency and moving average method， as well as the combination of the spatial analysis in GIS. Preliminary results show that the freezing index generally decreased with a tendency of -1.1 ℃·d·a-1 during 1901—2018. The change of the freezing index could be divided into three stages： decreased at a rate of -3.4 ℃·d·a-1 from 1901 to the 1943， increased at a rate of 8.8 ℃·d·a-1 from the 1943 to the 1966， and decreased again at a rate of -4.3 ℃·d·a-1 from the 1966 to 2018. On the contrary， the variation of the thawing index fluctuated but showed an overall increasing trend of 0.34 ℃·d·a-1， and the slope was 3.3 ℃·d·a-1 from 1901 to the 1943， -3.1 ℃·d·a-1 from the 1943 to the 1981， and 2.9 ℃·d·a-1 from the 1981 to 2018. From the perspective of spatial distribution， the freezing index exhibited a decreasing trend from west to east in the TRSR （from 3 400 to 600 ℃·d）， which is consistent with the decrease of continuality of permafrost and elevation. The thawing index increased from 0 to 1 800 ℃·d from west to east. The freezing index was largest and the thawing index was smallest in the Source Region of the Yangtze River， while the freezing index of the Source Region of the Yellow River was smallest and the thawing index was largest. This study may facilitate studies relevant to the effects of degradation of frozen soil on alpine ecological environment in the TRSR. |
| |
| Keywords: | Three-River Source Region permafrost air freezing/thawing index spatial and temporal variations CRU TS 4 03 datasets |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《冰川冻土》浏览原始摘要信息 |
| 点击此处可从《冰川冻土》下载免费的PDF全文 |
