气候变化领域集成服务门户(CCPortal): The eMLR(C*) Method to Determine Decadal Changes in the Global Ocean Storage of Anthropogenic CO2

CCPortal

DOI	10.1002/2017GB005819
	*The eMLR(C) Method to Determine Decadal Changes in the Global Ocean Storage of Anthropogenic CO2**
	Clement D.; Gruber N.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	654
结束页码	679
卷号	32 期号:4
英文摘要	The determination of the decadal change in anthropogenic CO2 in the global ocean from repeat hydrographic surveys represents a formidable challenge, which we address here by introducing a seamless new method. This method builds on the extended multiple linear regression (eMLR) approach to identify the anthropogenic CO2 signal, but in order to improve the robustness of this method, we fit C∗ rather than dissolved inorganic carbon and use a probabilistic method for the selection of the predictors. In order to account for the multiyear nature of the surveys, we adjust all C∗ observations of a particular observing period to a common reference year by assuming a transient steady state. We finally use the eMLR models together with global gridded climatological distributions of the predictors to map the estimated change in anthropogenic CO2 to the global ocean. Testing this method with synthetic data generated from a hindcast simulation with an ocean model reveals that the method is able to reconstruct the change in anthropogenic CO2 with only a small global bias (<5%). Within ocean basins, the errors can be larger, mostly driven by changes in ocean circulation. Overall, we conclude from the model that the method has an accuracy of retrieving the column integrated change in anthropogenic CO2 of about ±10% at the scale of whole ocean basins. We expect that this uncertainty needs to be doubled to about ±20% when the change in anthropogenic CO2 is reconstructed from observations. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	anthropogenic CO2; decadal change; eMLR method; ocean carbon sink
语种	英语
scopus关键词	anthropogenic effect; carbon dioxide; carbon sink; decadal variation; dissolved inorganic carbon; global ocean; numerical method; ocean basin; oceanic circulation
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129839
作者单位	Environmental Physics Group, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Zürich, Switzerland
推荐引用方式 GB/T 7714	Clement D.,Gruber N.. The eMLR(C*) Method to Determine Decadal Changes in the Global Ocean Storage of Anthropogenic CO2[J],2018,32(4).
APA	Clement D.,&Gruber N..(2018).The eMLR(C*) Method to Determine Decadal Changes in the Global Ocean Storage of Anthropogenic CO2.Global Biogeochemical Cycles,32(4).
MLA	Clement D.,et al."The eMLR(C*) Method to Determine Decadal Changes in the Global Ocean Storage of Anthropogenic CO2".Global Biogeochemical Cycles 32.4(2018).