气候变化领域集成服务门户(CCPortal): Testing the climate intervention potential of ocean afforestation using the Great Atlantic Sargassum Belt

CCPortal

DOI	10.1038/s41467-021-22837-2
	Testing the climate intervention potential of ocean afforestation using the Great Atlantic Sargassum Belt
	Bach L.T.; Tamsitt V.; Gower J.; Hurd C.L.; Raven J.A.; Boyd P.W.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	Ensuring that global warming remains <2 °C requires rapid CO2 emissions reduction. Additionally, 100–900 gigatons CO2 must be removed from the atmosphere by 2100 using a portfolio of CO2 removal (CDR) methods. Ocean afforestation, CDR through basin-scale seaweed farming in the open ocean, is seen as a key component of the marine portfolio. Here, we analyse the CDR potential of recent re-occurring trans-basin belts of the floating seaweed Sargassum in the (sub)tropical North Atlantic as a natural analogue for ocean afforestation. We show that two biogeochemical feedbacks, nutrient reallocation and calcification by encrusting marine life, reduce the CDR efficacy of Sargassum by 20–100%. Atmospheric CO2 influx into the surface seawater, after CO2-fixation by Sargassum, takes 2.5–18 times longer than the CO2-deficient seawater remains in contact with the atmosphere, potentially hindering CDR verification. Furthermore, we estimate that increased ocean albedo, due to floating Sargassum, could influence climate radiative forcing more than Sargassum-CDR. Our analysis shows that multifaceted Earth-system feedbacks determine the efficacy of ocean afforestation. © 2021, The Author(s).
语种	英语
scopus关键词	dissolved organic matter; organic carbon; sea water; calcium; carbon dioxide; sea water; afforestation; biogeochemistry; carbon fixation; climate effect; emission control; global warming; ocean; open ocean; radiative forcing; seaweed; testing method; afforestation; albedo; Article; atmosphere; biogeochemistry; biomass; carbon dioxide fixation; carbon storage; climate change; epibiont; greenhouse effect; nutrient; phytoplankton; radiative forcing; Sargassum; sea; sea surface waters; Atlantic Ocean; chemistry; ecosystem; feedback system; isolation and purification; pH; prevention and control; Sargassum; temperature; time factor; tropic climate; Atlantic Ocean; Atlantic Ocean (North); Sargasso Sea; Sargassum; Atlantic Ocean; Atmosphere; Biomass; Calcium; Carbon Dioxide; Ecosystem; Feedback; Global Warming; Hydrogen-Ion Concentration; Sargassum; Seawater; Temperature; Time Factors; Tropical Climate
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250701
作者单位	Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; University of New South Wales, Sydney, Australia; Centre for Southern Hemisphere Oceans Research, CSIRO Oceans and Atmosphere, Hobart, TAS, Australia; Fisheries and Oceans Canada, North Saanich, BC, Canada; Division of Plant Sciences, University of Dundee at the James Hutton Institute, Invergowrie, Dundee, United Kingdom; Climate Change Cluster, University of Technology, Ultimo, Sydney, Australia; School of Biological Sciences, University of Western Australia, Crawley, WA, Australia
推荐引用方式 GB/T 7714	Bach L.T.,Tamsitt V.,Gower J.,et al. Testing the climate intervention potential of ocean afforestation using the Great Atlantic Sargassum Belt[J],2021,12(1).
APA	Bach L.T.,Tamsitt V.,Gower J.,Hurd C.L.,Raven J.A.,&Boyd P.W..(2021).Testing the climate intervention potential of ocean afforestation using the Great Atlantic Sargassum Belt.Nature Communications,12(1).
MLA	Bach L.T.,et al."Testing the climate intervention potential of ocean afforestation using the Great Atlantic Sargassum Belt".Nature Communications 12.1(2021).