On the Southern Ocean CO2 uptake and the role of the biological carbon pump in the 21st century

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Author(s) Hauck, Judith, Völker, Christoph, Wolf-Gladrow, Dieter A., Laufkötter, Charlotte, Vogt, Matthias, Aumont, Olivier, Bopp, Laurent, Buitenhuis, Erik T., Doney, Scott C., Dunne, John, Gruber, Nicolas, Hashioka, Taketo, John, Jasmin, Le Quéré, Corinne, Lima, Ivan D., Nakano, H., Séférian, Roland, Totterdell, Ian
Publication Type Journal Items, Publication Status: Published
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Title On the Southern Ocean CO2 uptake and the role of the biological carbon pump in the 21st century
Author(s) Hauck, Judith
Völker, Christoph
Wolf-Gladrow, Dieter A.
Laufkötter, Charlotte
Vogt, Matthias
Aumont, Olivier
Bopp, Laurent
Buitenhuis, Erik T.
Doney, Scott C.
Dunne, John
Gruber, Nicolas
Hashioka, Taketo
John, Jasmin
Le Quéré, Corinne
Lima, Ivan D.
Nakano, H.
Séférian, Roland
Totterdell, Ian
Journal or Series Title Global Biogeochemical Cycles
Volume Number 29
Issue Number 9
Start Page 1451
End Page 1470
ISSN 0886-6236
Publisher American Geophysical Union
Publication Place Washington, DC
Publication Date 2015-09
Abstract We use a suite of eight ocean biogeochemical/ecological general circulation models from the Marine Ecosystem Model Intercomparison Project and Coupled Model Intercomparison Project Phase 5 archives to explore the relative roles of changes in winds (positive trend of Southern Annular Mode, SAM) and in warming- and freshening-driven trends of upper ocean stratification in altering export production and CO₂ uptake in the Southern Ocean at the end of the 21st century. The investigated models simulate a broad range of responses to climate change, with no agreement on a dominance of either the SAM or the warming signal south of 44°S. In the southernmost zone, i.e., south of 58°S, they concur on an increase of biological export production, while between 44 and 58°S the models lack consensus on the sign of change in export. Yet in both regions, the models show an enhanced CO₂ uptake during spring and summer. This is due to a larger CO2(aq) drawdown by the same amount of summer export production at a higher Revelle factor at the end of the 21st century. This strongly increases the importance of the biological carbon pump in the entire Southern Ocean. In the temperate zone, between 30 and 44°S, all models show a predominance of the warming signal and a nutrient-driven reduction of export production. As a consequence, the share of the regions south of 44°S to the total uptake of the Southern Ocean south of 30°S is projected to increase at the end of the 21st century from 47 to 66% with a commensurable decrease to the north. Despite this major reorganization of the meridional distribution of the major regions of uptake, the total uptake increases largely in line with the rising atmospheric CO₂. Simulations with the MITgcm-REcoM2 model show that this is mostly driven by the strong increase of atmospheric CO₂, with the climate-driven changes of natural CO₂ exchange offsetting that trend only to a limited degree (∼10%) and with negligible impact of climate effects on anthropogenic CO₂ uptake when integrated over a full annual cycle south of 30°S.
DOI 10.1002/2015GB005140
Additional Notes Published online by Wiley
Published online 23 September 2015
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 000041178
Source Database ID SCOPUS-84945200946
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  author = "Hauck, Judith and V{\"{o}}lker, Christoph and Wolf-Gladrow, Dieter A. and Laufk{\"{o}}tter, Charlotte and Vogt, Matthias and Aumont, Olivier and Bopp, Laurent and Buitenhuis, Erik T. and Doney, Scott C. and Dunne, John and Gruber, Nicolas and Hashioka, Taketo and John, Jasmin and Le Qu{\'{e}}r{\'{e}}, Corinne and Lima, Ivan D. and Nakano, H. and S{\'{e}}f{\'{e}}rian, Roland and Totterdell, Ian",
  title = "{O}n the {S}outhern {O}cean {C}{O}2 uptake and the role of the biological carbon pump in the 21st century",
  journal = "Global Biogeochemical Cycles",
  year = 2015,
  volume = "29",
  number = "9",
  pages = "1451--1470",
  month = sep,

E-Citations record created: Mon, 09 Nov 2015, 12:18:28 CET