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dc.contributor.author
Martinez-Rey, J.
dc.contributor.author
Bopp, Laurent
dc.contributor.author
Gehlen, Marion
dc.contributor.author
Tagliabue, Alessandro
dc.contributor.author
Gruber, Nicolas
dc.date.accessioned
2018-10-04T16:03:55Z
dc.date.available
2017-06-11T18:42:03Z
dc.date.available
2018-09-21T14:08:23Z
dc.date.available
2018-10-04T16:03:55Z
dc.date.issued
2015
dc.identifier.other
10.5194/bg-12-4133-2015
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/103082
dc.identifier.doi
10.3929/ethz-b-000103082
dc.description.abstract
he ocean is a substantial source of nitrous oxide (N2O) to the atmosphere, but little is known about how this flux might change in the future. Here, we investigate the potential evolution of marine N2O emissions in the 21st century in response to anthropogenic climate change using the global ocean biogeochemical model NEMO-PISCES. Assuming nitrification as the dominant N2O formation pathway, we implemented two different parameterizations of N2O production which differ primarily under low-oxygen (O2) conditions. When forced with output from a climate model simulation run under the business-as-usual high-CO2 concentration scenario (RCP8.5), our simulations suggest a decrease of 4 to 12 % in N2O emissions from 2005 to 2100, i.e., a reduction from 4.03/3.71 to 3.54/3.56 TgN yr−1 depending on the parameterization. The emissions decrease strongly in the western basins of the Pacific and Atlantic oceans, while they tend to increase above the oxygen minimum zones (OMZs), i.e., in the eastern tropical Pacific and in the northern Indian Ocean. The reduction in N2O emissions is caused on the one hand by weakened nitrification as a consequence of reduced primary and export production, and on the other hand by stronger vertical stratification, which reduces the transport of N2O from the ocean interior to the ocean surface. The higher emissions over the OMZ are linked to an expansion of these zones under global warming, which leads to increased N2O production, associated primarily with denitrification. While there are many uncertainties in the relative contribution and changes in the N2O production pathways, the increasing storage seems unequivocal and determines largely the decrease in N2O emissions in the future. From the perspective of a global climate system, the averaged feedback strength associated with the projected decrease in oceanic N2O emissions amounts to around −0.009 W m−2 K−1, which is comparable to the potential increase from terrestrial N2O sources. However, the assessment for a potential balance between the terrestrial and marine feedbacks calls for an improved representation of N2O production terms in fully coupled next-generation Earth system models.
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
Projections of oceanic N2O emissions in the 21st century using the IPSL Earth system model
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2015-07-13
ethz.journal.title
Biogeosciences
ethz.journal.volume
12
en_US
ethz.journal.issue
13
en_US
ethz.pages.start
4133
en_US
ethz.pages.end
4148
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.identifier.nebis
006289717
ethz.publication.place
Göttingen
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
en_US
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.relation.isSupplementedBy
10.5194/bg-12-4133-2015-supplement
ethz.relation.isNewVersionOf
handle/20.500.11850/164468
ethz.relation.isNewVersionOf
10.3929/ethz-b-000293692
ethz.date.deposited
2017-06-11T18:42:59Z
ethz.source
ECIT
ethz.identifier.importid
imp5936535f5c82775860
ethz.ecitpid
pub:161273
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-12T17:22:56Z
ethz.rosetta.lastUpdated
2019-01-02T14:23:33Z
ethz.rosetta.versionExported
true
ethz.COinS
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