河流水气界面CO_(2)脱气时间尺度变化研究进展  

A review on the time scale of CO_(2) degassing across water-air interface in river

作　　者：叶昕霞 张陶 蒲俊兵 李建鸿[1] Ye Xinxia;Zhang Tao;Pu Junbing;Li Jianhong(:Key Laboratory of Karst Dynamics,MNR/Guangxi,Institute of Karst Geology,Chinese Academy of Geological Sciences,Guilin 541004,P.R.China;College of Geography and Tourism,Chongqing Normal University,Wetland Science Research Center of the Upper Reaches of the Yangtze River,Three Gorges Reservoir Area Earth Surface Ecological Processes of Chongqing Observation and Research Station,Chongqing 401331,P.R.China)

机构地区：[1]中国地质科学院岩溶地质研究所,自然资源部/广西壮族自治区岩溶动力学重点实验室,桂林541004 [2]重庆师范大学地理与旅游学院,长江上游湿地科学研究重庆市重点实验室,三峡库区地表生态过程重庆市野外科学观测研究站,重庆401331

出　　处：《湖泊科学》2023年第3期795-807,共13页Journal of Lake Sciences

基　　金：国家自然科学基金项目(41907172,41977166);重庆师范大学人才引进/博士启动基金项目(21XLB048)联合资助。

摘　　要：河流作为连接陆地和海洋碳库之间的通道,是全球内陆水体碳排放最主要的载体,在全球碳循环中发挥着至关重要的作用。全球河流水气界面二氧化碳(CO_(2))脱气显著的时间异质性特征研究有助于深入理解其碳循环过程与机制,也为准确评估碳通量以及完善碳循环模型提供了科学支撑。本文系统梳理了国内外的相关研究成果,总结了目前河流CO_(2)脱气通量在昼夜、季节以及多年尺度上的动态变化及其影响因素,指出其昼夜变化与季节变化存在一定的周期性,并对不同空间尺度上CO_(2)脱气通量的时间差异进行讨论。同时分析当前研究中的不足,认为缺乏河流二氧化碳分压(p CO_(2))与CO_(2)脱气系数(k)高分辨率且长期连续的直接测量,限制了河流CO_(2)脱气通量时间尺度变化的周期性及相互之间关系的厘定,使得气候变化与人类活动对河流CO_(2)脱气时间动态的影响仍然难以量化与预测。最后,根据目前存在的问题,展望了未来的研究重点,为全球河流水气界面碳循环过程与机制、模型研究提供新的思路与方向,以及可以更准确地评估和预测未来河流碳排放的变化趋势。Rivers,as a conduit linking the carbon pools between land and ocean,are considered to be the most important carriers of carbon emissions from inland water bodies and play a crucial role in the global carbon cycle.The study of the significant temporal heterogeneity of carbon dioxide(CO_(2))degassing across the global river water-gas interface not only contributes to a deeper understanding of its carbon cycle processes and mechanisms,but also provides scientific support for the accurate assessment of carbon fluxes and the refinement of carbon cycle models.Here,we reviewed systematically the relevant researches in China and abroad and summarized the current dynamics of CO_(2) degassing fluxes in rivers at diurnal,seasonal and multi-year scales and its influencing factors.Then,a certain periodicity of diurnal and seasonal variations was demonstrated.In addition,we discussed the temporal differences of CO_(2) degassing fluxes at different spatial scales.We believed that the lack of high resolution and long-term continuous direct measurements of river CO_(2) partial pressure and CO_(2) degassing coefficients limited the periodicity of river CO_(2) degassing and its relationship with each other,making it still difficult to quantify and predict the impact of climate change and human activities on the temporal dynamics of river CO_(2) degassing.Finally,we prospected the emphasis of future research according to the current problems,which provided new ideas and directions for the study of global river water-air interface carbon cycle processes,mechanisms and modelling,as well as more accurate assessment and prediction of future trends in river carbon emissions.

关 键 词：全球碳循环 水气界面 CO_(2)脱气 时间尺度 

分 类 号：X143[环境科学与工程—环境科学]