表碛覆盖型冰川参数提取方法研究进展
Progress on extraction methods of parameters for debris-covered glaciers
周卫永 1许民 2韩惠 3韩海东 4康世昌4
作者信息
- 1. 兰州交通大学 测绘与地理信息学院,甘肃 兰州 730070;中国科学院 西北生态环境资源研究院 冰冻圈科学国家重点实验室,甘肃 兰州 730000;地理国情监测技术应用国家地方联合工程研究中心,甘肃 兰州 730070;甘肃省地理国情监测工程实验室,甘肃 兰州 730070
- 2. 中国科学院 西北生态环境资源研究院 冰冻圈科学国家重点实验室,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国家冰川冻土沙漠科学数据中心,甘肃 兰州 730000
- 3. 兰州交通大学 测绘与地理信息学院,甘肃 兰州 730070;地理国情监测技术应用国家地方联合工程研究中心,甘肃 兰州 730070;甘肃省地理国情监测工程实验室,甘肃 兰州 730070
- 4. 中国科学院 西北生态环境资源研究院 冰冻圈科学国家重点实验室,甘肃 兰州 730000;中国科学院大学,北京 100049
- 折叠
摘要
表碛的存在影响了大气与冰川间的能量传输过程,一方面,促进了冰面湖(塘)、冰崖的发育;另一方面,改变了冰川的消融过程和水文模式.利用表碛各项属性和物理参数模型化气候-表碛-冰川间的相互作用和反馈过程能够正确认识表碛覆盖型冰川变化的过程和机理,有助于准确估算和预测冰川物质平衡,进而判断冰川未来演变趋势.本文系统总结和对比了识别表碛范围、提取冰川流速以及获取表碛物理参数的各种技术手段,介绍了表碛覆盖影响下冰川消融模型的原理和应用情况,同时还对这些方法或模型的局限性和发展趋势进行了讨论.表碛覆盖型冰川所处山区地形起伏大、地表变化复杂,为遥感方法识别表碛范围和提取冰川流速带来了诸多困难,如现有表碛识别方法仍无法克服固有干扰因素的影响,而流速提取方法需具备较强抗干扰能力,且配对影像时间基线需尽可能短.当前表碛覆盖型冰川相关研究中关键参数、数据存在大量空缺的状况有望在将来得到改善,冰川动力学过程和表碛动态变化的模型描述将更为精细,冰川物质平衡、径流量等指标的评估和预测也将更为真实准确.
Abstract
The presence of supraglacial debris profoundly influences the energy transfer processes between the at-mosphere and glaciers,fostering the development of supraglacial ponds and ice cliffs,and significantly altering the glacier ablation processes and hydrological patterns.Modeling the interactions and feedback processes among climate,supraglacial debris,and glaciers by various parameters of debris deepens our understanding of the process and mechanism of debris-covered glaciers change,aiding in the accurate estimation and prediction of glacier mass balance,and then assisting in assessing the future evolution trend of glacier morphology.This pa-per systematically summarizes and compares various techniques for identifying the extent of debris cover,ex-tracting glacier flow velocities,and obtaining physical parameters of supraglacial debris.Additionally,it intro-duces the principles and applications of glacier ablation models incorporating supraglacial debris cover effects.Furthermore,the limitations and future developments of these methods or models are discussed.Debris-covered glaciers situated in mountainous terrains with complex surface changes,posing several challenges for remote sensing methods to identify the extent of debris cover and extract glacier flow velocities:the existing supragla-cial debris identification methods are still unable to overcome the influence of inherent disturbing factors;The flow velocity extraction methods should have a strong anti-interference ability,and the time baseline for paired images need to be as short as possible.The present state of research on debris-covered glaciers reveals significant data gaps in key parameters and data.Nevertheless,it is expected that these deficiencies will be addressed in the future,resulting in more refined models describing glacier dynamics and the change processes of supraglacial de-bris.Consequently,assessments and predictions of glacier mass balance,runoff,and other indicators are antici-pated to become more realistic and accurate.
关键词
表碛覆盖型冰川/表碛参数提取/冰川流速提取/冰川物质平衡/能量平衡模型Key words
debris-covered glacier/parameter extraction of supraglacial debris/extract glacier flow velocity/glacier mass balance/energy-balance model引用本文复制引用
基金项目
国家自然科学基金(41971094)
国家自然科学基金(42371145)
中国科学院海外科教合作中心部署项目(046GJHZ2023069MI)
中国科学院青年创新促进会人才项目(2019414)
国家冰川冻土沙漠科学数据中心开放基金(E01Z790201)
出版年
2024
NETL
NSTL
万方数据