DOI: 10.1002/2017GB005819
Scopus记录号: 2-s2.0-85045912276
论文题名: The eMLR(C*) Method to Determine Decadal Changes in the Global Ocean Storage of Anthropogenic CO2
作者: Clement D ; , Gruber N
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2018
语种: 英语
英文关键词: Anthropogenic CO2
; Decadal change
; EMLR method
; Ocean carbon sink
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77684
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Environmental Physics Group, Institute of Biogeochemistry and Pollutant Dynamics ETH Zurich Zürich Switzerland
Recommended Citation:
Clement D,, Gruber N. The eMLR(C*) Method to Determine Decadal Changes in the Global Ocean Storage of Anthropogenic CO2[J]. Global Biogeochemical Cycles,2018-01-01