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基于遥感测算的每月CO2流量估计在三峡水库的吸水区

Shuang Zhang¹, Xin Long², Lang Liu³

¹Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China; College of Resources and Environment, Chongqing School, University of the Chinese Academy of Sciences (UCAS Chongqing), Chongqing, China.

Journal of environmental management

|October 16, 2025

概括

来自三峡水库吸水区的温室气体排放量很大,但被低估了. 遥感显示,这些地区对水力发电有很大贡献.

科学领域:

环境科学环境科学
遥感遥感遥感遥感
气候变化气候变化

背景情况:

储水库中的吸收区域被认为是温室气体 (GHG) 热点.
由于监测困难,从大型,动态的水库抽取区域量化温室气体排放具有挑战性.
三峡水库 (TGR) 吸水区对温室气体排放的贡献不明.

研究的目的:

开发一个遥感框架,用于估计TGR drawdown区域的二氧化碳流量.
量化TGR采用区对总储库温室气体排放的贡献.
确定吸收区二氧化碳排放的主要驱动因素及其与水库运营的关系.

主要方法:

开发了一个远程传感框架,集成了哨兵-1的SAR图像,DEM和水文数据.
为TGR抽取区域 (2015-2023) 生成高分辨率 (30m,每月) CO2流量估计.
以92.3%的准确度绘制了动态陆水界限.

主要成果:

在TGR吸收区 (21.7%的水库表面) 每年排放392.2±19.5千克二氧化碳,占水库总排放量的44.4%.
吸收期间暴露的陆地阶段是主要的排放源 (82.4%).
二氧化碳排放与水库水位 (r = -0.91) 具有强烈的反向相关性,表明人为控制.

结论:

减排区的排放是水力发电碳足迹的关键,低估的组成部分.
人为水库的运作,而不是自然的季节性,决定了排放水平.
适应式的水库管理策略有可能减轻这些显著的二氧化碳排放.

关键词:

的二氧化碳排放量.提款区是指提款区,是指提款区.管理水库的管理.三峡水库是三个峡谷的水库.

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