利用InSAR技术估计长江源冰川2000—2020年物质平衡

doi:10.11947/j.AGCS.2024.20230262

测绘学报 ›› 2024, Vol. 53 ›› Issue (5): 801-812.doi: 10.11947/j.AGCS.2024.20230262

• 青藏高原冰冻圈重大变化专栏 • 上一篇下一篇

利用InSAR技术估计长江源冰川2000—2020年物质平衡

李佳¹^,²^,³^,⁴(), 李志伟¹^,³(), 钟文杰¹^,³^,⁴, 顾云杨¹^,³^,⁴, 李龙⁵, 郭磊¹^,³, 冯娟娟¹^,³

^1.中南大学地球科学与信息物理学院，湖南　长沙　410083
^2.大地测量与地球动力学国家重点实验室，湖北　武汉　430077
^3.有色金属成矿预测与地质环境监测教育部重点实验室（中南大学），湖南　长沙　410083
^4.中南大学地灾感知认知预知研究室，湖南　长沙　410083
^5.青海省自然资源遥感中心，青海　西宁　810001

收稿日期:2023-06-28 修回日期:2024-01-05 发布日期:2024-06-19
通讯作者: 李志伟 E-mail:lijia20050710@csu.edu.cn;zwli@csu.edu.cn
作者简介:李佳（1986—），男，博士，副教授，研究方向为冰川遥感监测、地质灾害遥感监测、InSAR基础理论研究。E-mail：lijia20050710@csu.edu.cn
基金资助:
国家重点研发计划(2022YFB3903602);国家自然科学基金(42374053);湖南省自然科学基金(2023JJ30656);大地测量与地球动力学国家重点实验室开放基金(SKLGED2023-2-3)

Estimating glacier mass balance in the source region of the Yangtze River during 2000—2020 through InSAR

Jia LI¹^,²^,³^,⁴(), Zhiwei LI¹^,³(), Wenjie ZHONG¹^,³^,⁴, Yunyang GU¹^,³^,⁴, Long LI⁵, Lei GUO¹^,³, Juanjuan FENG¹^,³

^1.School of Geoscience and Info-physics, Central South University, Changsha 410083, China
^2.State Key Laboratory of Geodesy and Earth's Dynamics, Wuhan 430077, China
^3.Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha 410083, China
^4.Laboratory of Geo-hazards Perception, Cognition and Predication, Central South University, Changsha 410083, China
^5.Qinghai Remote Sensing Center for Natural Resources, Xining 810001, China

Received:2023-06-28 Revised:2024-01-05 Published:2024-06-19
Contact: Zhiwei LI E-mail:lijia20050710@csu.edu.cn;zwli@csu.edu.cn
About author:LI Jia (1986—), male, PhD, associate professor, majors in remote sensing of glaciers, remote sensing of geohazards, and InSAR basic theory. E-mail: lilia20050710@csu.edu.cn
Supported by:
The National Key Research and Development Program of China(2022YFB3903602);The National Natural Science Foundation of China(42374053);The Hunan Provincial Natural Science Foundation(2023JJ30656);The Open Fund of the State Key Laboratory of Geodesy and Earth's Dynamics(SKLGED2023-2-3)

摘要/Abstract

摘要：

本文以获取近20年长江源冰川物质平衡，揭示冰川物质平衡影响因素及冰川物质流失对河流径流量影响为目标开展研究。利用InSAR技术和双站TerraSAR-X/TanDEM-X影像生成两期覆盖长江源全域冰川的DEM，分别和SRTM DEM差分，去除高程差系统误差后获取长江源地区冰川2000—2012年和2000—2020年间的高分辨率冰川厚度变化，再结合冰川密度将厚度变化转为冰川物质平衡。估计结果与区域内冰川实地物质平衡监测结果仅相差0.03 m w.e.a^－1，表明精度较高。结果显示长江源地区冰川在2000—2012年间的物质平衡为（－0.30±0.02）m w.e.a^－1，在2000—2020年间为（－0.45±0.04）m w.e.a^－1，2012—2020年间冰川消融相比2000—2012年间明显加速。推测夏季气温升高和夏季降水减少是冰川加速消融的主要原因。另外，长江源地区冰川消融速度存在从东南向西北递减的趋势，分析认为这一现象与西部地区温度更低，升温更慢，冰川海拔更高，积累区面积比例更高，冰面坡度更陡有关。2000—2020年间，沱沱河流域冰川物质损失量仅占沱沱河径流量的4.4%，而沱沱河与当曲流域的冰川物质损失量之和仅占通天河径流量的2.5%，表明当前冰川物质损失对长江上游径流量的影响较小。

关键词: 长江源, 冰川物质平衡, TanDEM-X影像, 消融, 径流量

Abstract:

This paper aims to estimate glacier mass balance in the source region of the Yangtze River, to investigate the factors that affect glacier mass balance, and to reveal the impacts of glacier mass changes on the runoff of the rivers. In particular, the InSAR technique and bistatic TerraSAR-X/TanDEM-X images were utilized to generate two DEMs that cover most of glaciers in the source region of the Yangtze River. The new DEMs were then differenced with SRTM DEM to obtain glacier thickness changes during 2000—2012 and 2000—2020, and a glacier mass density was used to converted the glacier thickness changes into glacier mass balance. The discrepancy between the derived glacier mass balance and the field measured glacier mass balance is only 0.03 m w.e.a^－1, indicating a high precision of the results. The glacier mass balance in source region of the Yangtze River during 2000—2012 and 2000—2020 were (－0.30±0.02) m w.e.a^－1 and (－0.45±0.04) m w.e.a^－1, respectively. Glacier melting during 2012—2020 apparently intensified relative to that during 2000—2012. Rise of summer temperature and decease of summer precipitation were deemed as the main cause of glacier mass loss. Moreover, the glacier melting rate decreases from the southeastern part to the northwestern part of the study area. Lower summer temperature, smaller temperature rising speed, higher glacier altitude, higher glacier accumulation area ratio, steeper glacier surface of the west area may account for this phenomenon. During 2000—2020, the glacier mass loss in the basin of the Tuotuo River contributed 4.4% of the runoff of the Tuotuo River, and those in the basins of the Tuotuo River and the Dangqu River contributed 2.5% of the runoff of the Tongtian River, indicating that glacier mass loss had slight impact on the runoff the upper reaches of the Yangtze River.

Key words: source region of the Yangtze River, glacier mass balance, TanDEM-X images, melting, runoff

中图分类号:

P237

李佳, 李志伟, 钟文杰, 顾云杨, 李龙, 郭磊, 冯娟娟. 利用InSAR技术估计长江源冰川2000—2020年物质平衡[J]. 测绘学报, 2024, 53(5): 801-812.

Jia LI, Zhiwei LI, Wenjie ZHONG, Yunyang GU, Long LI, Lei GUO, Juanjuan FENG. Estimating glacier mass balance in the source region of the Yangtze River during 2000—2020 through InSAR[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(5): 801-812.

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利用InSAR技术估计长江源冰川2000—2020年物质平衡

Estimating glacier mass balance in the source region of the Yangtze River during 2000—2020 through InSAR

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