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dc.contributor.author
Keppler, Lydia
dc.contributor.author
Landschützer, Peter
dc.contributor.author
Lauvset, Siv K.
dc.contributor.author
Gruber, Nicolas
dc.date.accessioned
2023-06-07T11:57:49Z
dc.date.available
2023-06-05T03:26:58Z
dc.date.available
2023-06-07T11:57:49Z
dc.date.issued
2023-05
dc.identifier.issn
0886-6236
dc.identifier.issn
1944-9224
dc.identifier.other
10.1029/2022GB007677
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/615080
dc.identifier.doi
10.3929/ethz-b-000615080
dc.description.abstract
Several methods have been developed to quantify the oceanic accumulation of anthropogenic carbon dioxide (CO2) in response to rising atmospheric CO2. Yet, we still lack a corresponding estimate of the changes in the total oceanic dissolved inorganic carbon (DIC). In addition to the increase in anthropogenic CO2, changes in DIC also include alterations of natural CO2. Once integrated globally, changes in DIC reflect the net oceanic sink for atmospheric CO2, complementary to estimates of the air-sea CO2 exchange based on surface measurements. Here, we extend the MOBO-DIC machine learning approach by Keppler et al. (2020a, https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.nodc%3A0221526) to estimate global monthly fields of DIC at 1° resolution over the top 1,500 m from 2004 through 2019. We find that over these 16 years and extrapolated to cover the whole global ocean down to 4,000 m, the oceanic DIC pool increased close to linearly at an average rate of 3.2 ± 0.7 Pg C yr−1. This trend is statistically indistinguishable from current estimates of the oceanic uptake of anthropogenic CO2 over the same period. Thus, our study implies no detectable net loss or gain of natural CO2 by the ocean, albeit the large uncertainties could be masking it. Our reconstructions suggest substantial internal redistributions of natural oceanic CO2, with a shift from the midlatitudes to the tropics and from the surface to below ∼200 m. Such redistributions correspond with the Pacific Decadal Oscillation and the Atlantic Multidecadal Oscillation. The interannual variability of DIC is strongest in the tropical Western Pacific, consistent with the El Ni (Formula presented.) o Southern Oscillation.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Geophysical Union
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject
Global carbon cycle
en_US
dc.subject
Climate change
en_US
dc.subject
Ocean biogeochemistry
en_US
dc.subject
Machine learning
en_US
dc.subject
Observation-based
en_US
dc.subject
Ocean carbon cycle
en_US
dc.title
Recent Trends and Variability in the Oceanic Storage of Dissolved Inorganic Carbon
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.date.published
2023-04-13
ethz.journal.title
Global Biogeochemical Cycles
ethz.journal.volume
37
en_US
ethz.journal.issue
5
en_US
ethz.journal.abbreviated
Glob. biogeochem. cycles
ethz.pages.start
e2022GB007677
en_US
ethz.size
25 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Climate-Carbon Interactions in the Coming Century
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02721 - Inst. f. Biogeochemie u. Schadstoffdyn. / Inst. Biogeochem. and Pollutant Dynamics::03731 - Gruber, Nicolas / Gruber, Nicolas
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02721 - Inst. f. Biogeochemie u. Schadstoffdyn. / Inst. Biogeochem. and Pollutant Dynamics::03731 - Gruber, Nicolas / Gruber, Nicolas
ethz.grant.agreementno
821003
ethz.grant.fundername
EC
ethz.grant.funderDoi
10.13039/501100000780
ethz.grant.program
H2020
ethz.date.deposited
2023-06-05T03:27:01Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2023-06-07T11:57:50Z
ethz.rosetta.lastUpdated
2024-02-02T23:56:26Z
ethz.rosetta.versionExported
true
ethz.COinS
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