澜沧江梯级水库CO2和CH4排放通量研究
Study on CO2 and CH4 emission fluxes from Lancang River cascade reservoirs
陶雨晨 1傅开道 1张洁 1杨丽莎 1袁茜1
作者信息
- 1. 云南大学国际河流与生态安全研究院,昆明 650500;云南大学云南省国际河流与跨境生态安全重点实验室,昆明 650500
- 折叠
摘要
温室效应已成为重要的全球气候问题,而内陆水体是温室气体(CO2 和CH4)的重要排放源,更有研究发现筑坝蓄水可能引起河流水体CO2 和CH4 排放的增多.为积极响应国家"双碳"目标,使用水库温室气体净排放通量评估模型G-res Tool,利用流域基本信息及水库特征数据,对澜沧江干流已建成的10 座梯级水库温室气体(CO2 和CH4)进行模拟计算,10 座水库蓄水后温室气体(CO2 和CH4)年排放通量平均值为162.81 g CO2e/(m2∙a),远低于全球水库平均水平,均表现为温室气体的"源",从上游至下游整体呈增加趋势,且排放以CO2 为主,全年CO2 排放通量为CH4 的 36 倍.考虑了水库蓄水前的温室气体排放及其他非相关人类活动的影响后,得到澜沧江水库温室气体(CO2 和CH4)年净排放通量平均值为 225.70 g CO2e/(m2∙a),表明筑坝增加了库区水体温室气体排放,但和火力发电相比,仍属于相对清洁能源.
Abstract
The greenhouse effect has become an important global climate issue,and inland waters are an important source of emissions of the greenhouse gases(GHG)CO2 and CH4.It has been found that hydropower energy,once considered clean,may cause an increase in CO2 and CH4 emissions from river waters as a result of damming and impounding water.In order to actively respond to the national"Dual-Carbon"goal and clarify the impact of damming and impounding on GHG emissions from water bodies,the G-res Tool,a model for evaluating the net flux of GHG emissions from reservoirs,was used to simulate the CO2 and CH4 emission fluxes before and after impoundment of 10 completed terrace reservoirs on the main stream of the Lancang River.The average annual GHG(CO2 and CH4)emission flux of the 10 reservoirs after impoundment is 162.81 g CO2e/(m2∙a),which is much lower than the global average level of reservoirs,but all of them behave as"sources"of GHGs,with an overall upward trend from upstream to downstream.Emissions are dominated by CO2,with an annual CO2 emission fluxes 36 times that of CH4,which is dominated by diffuse and off-gas emissions.After considering the GHG emissions prior to reservoir impoundment and the impacts of unrelated anthropogenic sources,the average annual net flux of GHG(CO2 and CH4)emissions from the reservoir is 225.70 g CO2e/(m2∙a),suggesting that damming increases the release of GHGs from the reservoir waters.However,hydropower is still a relatively clean energy compared to thermal power generation.
关键词
澜沧江/梯级电站/水库温室气体/模型/净排放通量Key words
Lancang River/Terraced power station/Reservoir greenhouse gas/Model/Net emission flux引用本文复制引用
基金项目
国家自然科学基金(42061006)
国家自然科学基金(41571032)
云南大学专业学位研究生实践创新基金项目(ZC-22222960)
出版年
2024
国家科技期刊平台
NSTL
万方数据