气候变化领域集成服务门户(CCPortal): Coccolithophore Growth and Calcification in an Acidified Ocean: Insights From Community Earth System Model Simulations

CCPortal

DOI	10.1029/2018MS001483
	Coccolithophore Growth and Calcification in an Acidified Ocean: Insights From Community Earth System Model Simulations
	Krumhardt K.M.; Lovenduski N.S.; Long M.C.; Levy M.; Lindsay K.; Moore J.K.; Nissen C.
发表日期	2019
ISSN	19422466
起始页码	1418
结束页码	1437
卷号	11 期号:5
英文摘要	Anthropogenic CO2 emissions are inundating the upper ocean, acidifying the water, and altering the habitat for marine phytoplankton. These changes are thought to be particularly influential for calcifying phytoplankton, namely, coccolithophores. Coccolithophores are widespread and account for a substantial portion of open ocean calcification; changes in their abundance, distribution, or level of calcification could have far-reaching ecological and biogeochemical impacts. Here, we isolate the effects of increasing CO2 on coccolithophores using an explicit coccolithophore phytoplankton functional type parameterization in the Community Earth System Model. Coccolithophore growth and calcification are sensitive to changing aqueous CO2. While holding circulation constant, we demonstrate that increasing CO2 concentrations cause coccolithophores in most areas to decrease calcium carbonate production relative to growth. However, several oceanic regions show large increases in calcification, such the North Atlantic, Western Pacific, and parts of the Southern Ocean, due to an alleviation of carbon limitation for coccolithophore growth. Global annual calcification is 6% higher under present-day CO2 levels relative to preindustrial CO2 (1.5 compared to 1.4 Pg C/year). However, under 900 μatm CO2, global annual calcification is 11% lower than under preindustrial CO2 levels (1.2 Pg C/year). Large portions of the ocean show greatly decreased coccolithophore calcification relative to growth, resulting in significant regional carbon export and air-sea CO2 exchange feedbacks. Our study implies that coccolithophores become more abundant but less calcified as CO2 increases with a tipping point in global calcification (changing from increasing to decreasing calcification relative to preindustrial) at approximately ∼600 μatm CO2. ©2019. The Author.
英文关键词	climate change; coccolithophores; marine calcification; ocean acidification; phytoplankton
语种	英语
scopus关键词	Acidification; Biomineralization; Calcium carbonate; Carbon; Carbon dioxide; Climate change; Marine biology; Oceanography; Phytoplankton; Carbon limitation; CO2 concentration; Coccolithophores; Earth system model; Functional types; Marine phytoplankton; Ocean acidifications; Oceanic regions; Bone; anthropogenic source; calcification; calcium carbonate; carbon dioxide; carbon emission; climate change; coccolith; ocean acidification; parameterization; phytoplankton; Atlantic Ocean; Atlantic Ocean (North); Southern Ocean; Haptophyceae
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156910
作者单位	Environmental Studies Program and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States; Climate and Global Dynamics, National Center for Atmospheric Research, Boulder, CO, United States; Department of Atmospheric and Oceanic Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States; Department of Earth System Science, University of California, Irvine, CA, United States; Institute for Biogeochemistry and Pollutant Dynamics, ETH Zürich, Zürich, Switzerland
推荐引用方式 GB/T 7714	Krumhardt K.M.,Lovenduski N.S.,Long M.C.,et al. Coccolithophore Growth and Calcification in an Acidified Ocean: Insights From Community Earth System Model Simulations[J],2019,11(5).
APA	Krumhardt K.M..,Lovenduski N.S..,Long M.C..,Levy M..,Lindsay K..,...&Nissen C..(2019).Coccolithophore Growth and Calcification in an Acidified Ocean: Insights From Community Earth System Model Simulations.Journal of Advances in Modeling Earth Systems,11(5).
MLA	Krumhardt K.M.,et al."Coccolithophore Growth and Calcification in an Acidified Ocean: Insights From Community Earth System Model Simulations".Journal of Advances in Modeling Earth Systems 11.5(2019).