“碳中和”目标背景下我国海洋碳汇与碳年龄的思考  

Evaluating the Carbon Sink in Chinese Marginal Seas in the Context of Carbon Neutrality Goals:Insight from Carbon Ages

作　　者：包锐 Bao Rui(Frontiers Science Center for Deep Ocean Multispheres and Earth System,the Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China;Laboratory for Marine Ecology and Environmental Science,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China)

机构地区：[1]中国海洋大学深海圈层与地球系统前沿科学中心海洋化学理论与工程技术教育重点实验室,山东青岛266100 [2]青岛海洋科学与技术试点国家实验室海洋生态与环境科学功能实验室,山东青岛266237

出　　处：《中国海洋大学学报（自然科学版）》2023年第4期1-7,共7页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(42076037,96058207)资助。

摘　　要：自然碳汇是实现国家“碳中和”目标的重要途径。海洋是自然碳汇的重要区域,在吸收、转化、埋藏CO_(2)等碳循环过程中起到了关键作用。虽然目前我国海洋碳汇格局具有一定的研究基础,但还需进一步清晰地理解“碳中和”目标背景下海洋碳汇的意义。本文初步梳理了中国边缘海天然放射性碳同位素碳-14的年龄相关数据,探讨了评估海洋碳汇的关键要素之一:碳的年龄。文章认为碳库年龄尺度与碳汇过程时间是评估海洋碳汇的关键要素。在“碳中和”目标背景下,海洋碳库周转时间尺度越长,对实现海洋有效碳汇越有利;而在CO_(2)转化为海洋含碳化合物后,最终埋藏于海底的碳汇过程时间越长,其从碳循环过程中再回到大气中的可能性越大,越不利于快速实现海洋碳汇。本文通过对海洋碳汇时间关键要素的初步分析,为深入理解“碳中和”目标背景下的海洋碳汇理论提供了指导意义,为开展人类干预下的海洋碳汇工程措施提供了一定的理论基础。Natural carbon sink is one of the most important means for achieving the carbon neutrality.Ocean is acritical zone to achieve the natural carbon sin in terms of its roles in the carbon cycles in the processes such as CO_(2) assimilation transformation,sequestration.The criteria of evaluating ocean carbon sink should be seriously reconsidered in the context of carbon neutrality goals,while there has been an advance in the spatial controlling mechanisms for carbon sink in the Chinese marginal seas so far.Here this study reviewed that available radiocarbon data from the Chinese marginal seas including the Bohai Sea,Yellow Sea,East China Sea,to understand the significance of carbon age in evaluating ocean carbon sink.The paper suggested that carbon residence time and cycle process aging with(in) the carbon pools are the key variable for evaluating ocean carbon sin.In the context of carbon neutrality goals,increasing carbon residence time in an ocean carbon pool would be benefitable for the ocean carbon sink;Meanwhile,if carbon is aging during the carbon cycles,it means that the it will cost a longer time for CO_(2) assimilation transformation,sequestration in the ocean,during which there are more chances for CO_(2) to degassing into the atmosphere.The processes are not positive for achieving a rapid carbon sink.Our study would shed new light on understanding the ocean carbon sink in the context of carbon neutrality goals through analyzing the ^(14)C data in the Chinese marginal seas,providing an efficient mean to find the human-induced but nature-based solutions for achieving the carbon neutrality.

关 键 词：碳中和 海洋碳汇 中国边缘海 有机碳 碳-14年龄 

分 类 号：P734.2[天文地球—海洋化学]