globalchange  > 气候变化事实与影响
DOI: 10.1002/2015GB005140
Scopus ID: 2-s2.0-84945200946
On the Southern Ocean CO2 uptake and the role of the biological carbon pump in the 21st century
Author: Hauck J; , Völker C; , Wolf-Gladrow D; A; , Laufkötter C; , Vogt M; , Aumont O; , Bopp L; , Buitenhuis E; T; , Doney S; C; , Dunne J; , Gruber N; , Hashioka T; , John J; , Quéré C; L; , Lima I; D; , Nakano H; , Séférian R; , Totterdell I
Source Publication: Global Biogeochemical Cycles
ISSN: 8866236
Publishing Year: 2015
Volume: 29, Issue:9
pages begin: 1451
pages end: 1470
Language: 英语
Keyword: CMIP5 ; ecosystem model intercomparison ; export production ; ocean carbon sink ; polar carbon cycle ; Southern Annular Mode
Scopus Keyword: anthropogenic effect ; biogeochemical cycle ; biological pump ; carbon dioxide ; climate change ; ecosystem modeling ; general circulation model ; meridional circulation ; model test ; nutrient availability ; stratification ; twenty first century ; upper ocean ; warming ; wind direction ; Southern Ocean
English 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. ©2015. The Authors.
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Affiliation: Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany; Department of Environmental Sciences ETH Zurich, Zurich, Switzerland; Laboratoire de Physique des Océans, IRD, IUEM, Plouzané, France; IPSL/LSCE, UMR8212, CNRS-CEA-UVSQ, Gif sur Yvette, France; Tyndall Centre for Climate Change Research, University of East Anglia, Norwich, United Kingdom; Woods Hole Oceanographic Institution, Department of Marine Chemistry and Geochemistry, Woods Hole, MA, United States; Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan; Meteorological Research Institute, Tsukuba, Japan; CNRM-GAME, Toulouse, France; Met Office, Exeter, United Kingdom

Recommended Citation:
Hauck J,, Völker C,, Wolf-Gladrow D,et al. On the Southern Ocean CO2 uptake and the role of the biological carbon pump in the 21st century[J]. Global Biogeochemical Cycles,2015-01-01,29(9)
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