海洋负排放的生态工程方案

Eco-engineering approaches for ocean negative carbon emission

在未来30~40年内实现“碳中和”目标已成世界范围内共识,但亟需全人类共同努力以应对日益严重的气候变化威胁.实现这一宏伟目标的基本途径,一是减少人为向大气排放的二氧化碳,二是增加碳汇或负排放,即从大气中去除二氧化碳.本文提出海洋负排放的生态工程方案,旨在呼吁加强利用海洋环境中的碳汇潜力,同时倡议建立一个多国共同参与的国际大科学计划,以促进海洋负排放相关技术途径与实施方案的研发,综合考虑驱动不同形式碳汇(无机/有机、生物/非生物、颗粒态/溶解态)的生态与生物地球化学过程和机制.本文重点关注旨在揭示生物泵(BP)、微型生物碳泵(MCP)、微生物诱导碳酸盐沉积(MICP)之间相互作用的变革性机制研究,特别是提高富营养化河口、低氧和缺氧水域、珊瑚礁生态系统以及水产养殖区的碳汇潜能.海洋负排放生态工程对实现碳汇并减轻环境压力具有重要意义.

The goal of achieving carbon neutrality in the next 30-40 years is approaching worldwide consensus and requires coordinated efforts to combat the increasing threat of climate change.Two main sets of actions have been proposed to address this grand goal.One is to reduce anthropogenic CO2emissions to the atmosphere,and the other is to increase carbon sinks or negative emissions,i.e.,removing CO2from the atmosphere.Here we advocate eco-engineering approaches for ocean negative carbon emission(ONCE),aiming to enhance carbon sinks in the marine environment.An international program is being established to promote coordinated efforts in developing ONCE-relevant strategies and methodologies,taking into consideration ecological/biogeochemical processes and mechanisms related to different forms of carbon(inorganic/organic,biotic/abiotic,particulate/dissolved) for sequestration.We focus on marine ecosystem-based approaches and pay special attention to mechanisms that require transformative research,including those elucidating interactions between the biological pump(BP),the microbial carbon pump(MCP),and microbially induced carbonate precipitation(MICP).Eutrophic estuaries,hypoxic and anoxic waters,coral reef ecosystems,as well as aquaculture areas are particularly considered in the context of efforts to increase their capacity as carbon sinks.ONCE approaches are thus expected to be beneficial for both carbon sequestration and alleviation of environmental stresses.