摘要
甲烷(CH_(4))和氧化亚氮(N_(2)O)是备受关注的温室气体.近年来,城市河流已经成为不可忽视的CH_(4)和N_(2)O排放源,亟需予以关注.探究城市河流CH_(4)和N_(2)O产生及排放的时空特征、机制和影响因素对城市碳减排具有重要意义.通过梳理近20年国内外文献关于城市河流CH_(4)和N_(2)O溶存浓度与排放通量实测数据,总结了当前城市河流CH_(4)和N_(2)O排放的时空特征;估算得到2018年北京市城市河流的CH_(4)和N_(2)O排放量(以CO_(2)-eq计)分别为234.63 Gg和59.53 Gg,估算得到2018年上海市城市河流的CH_(4)和N_(2)O排放量(以CO_(2)-eq计)分别为159.86 Gg和260.24 Gg,表明城市河流是不容忽视的CH_(4)和N_(2)O排放源;整理了城市河流中CH_(4)和N_(2)O的产生/消耗过程与输入/输出过程;从河流内部理化性质、河流外部水文及植被条件、城市化进程的角度,分析了城市河流CH_(4)和N_(2)O产生与排放过程的主要影响因素;最后提出了城市河流CH_(4)和N_(2)O排放核算与减排的未来研究重点,为今后城市河流的温室气体减排提供理论支持.
Methane(CH_(4))and nitrous oxide(N_(2)O)are concerning greenhouse gases.Urban rivers have been important emission sources of CH_(4)and N_(2)O in recent years.It is meaningful for city greenhouse gas reduction to provide a systematic analysis of spatiotemporal characteristics,mechanisms,and influencing factors of the production and emission of CH_(4)and N_(2)O from urban rivers.This study combed measured data of urban river CH_(4)and N_(2)O dissolution concentrations and emission fluxes from related literature published in the past 20 years and also concluded the spatiotemporal characteristics of urban river CH_(4)and N_(2)O emissions.This study estimated that CH_(4)and N_(2)O emissions(expressed by CO_(2)-eq)from urban rivers in Beijing were 234.63 and 59.53 Gg CO_(2)-eq in 2018,whereas CH_(4)and N_(2)O emissions(expressed by CO_(2)-eq)from urban rivers in Shanghai were 159.86 and 260.24 Gg CO_(2)-eq in 2018,respectively.These results demonstrated that urban rivers have become important CH_(4)and N_(2)O emission sources.This study summarized the production/consumption processes and import/export pathways of CH_(4)and N_(2)O in urban rivers.What is more,this study discussed the main influencing factors of urban river CH_(4)and N_(2)O production and emissions from the perspectives of river environmental conditions and urbanization effects.At last,the present work prospected the future research trends of urban river CH_(4)and N_(2)O emissions and provides urban rivers with scientific support for greenhouse gas reduction.
作者
李轩
苑心
门聪
杨静怡
左剑恶
LI Xuan;YUAN Xin;MEN Cong;YANG Jing-yi;ZUO Jian-e(State Key Joint Laboratory of Environmental Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China;Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants,School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2024年第8期4932-4945,共14页
Environmental Science
基金
国家重点研发计划项目(2022YFC3203202)
深圳市科技创新委员会稳定支持项目(WDZC20200819163549002)。
