FN Archimer Export Format
PT J
TI Localized subduction of anthropogenic carbon dioxide in the Southern Hemisphere oceans
BT 
AF SALLEE, Jean-Baptiste
   MATEAR, Richard J.
   RINTOUL, Stephen R.
   LENTON, Andrew
AS 1:1;2:2;3:2,3;4:2;
FF 1:;2:;3:;4:;
C1 British Antarctic Survey, Cambridge CB3 0ET, England.
   CMAR CSIRO, Hobart, Tas 7000, Australia.
   Antarctic Climate & Ecosyst Cooperat Res Ctr, Sandy Bay, Tas 7005, Australia.
C2 BRITISH ANTARCTIC SURVEY, UK
   CSIRO, AUSTRALIA
   ACE CRC, AUSTRALIA
IF 12.37
TC 152
UR https://archimer.ifremer.fr/doc/00140/25129/82433.pdf
LA English
DT Article
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BO L'Astrolabe
AB The oceans slow the rate of climate change by absorbing about 25% of anthropogenic carbon dioxide emissions annually. The Southern Ocean makes a substantial contribution to this oceanic carbon sink: more than 40% of the anthropogenic carbon dioxide in the ocean has entered south of 40° S. The rate-limiting step in the oceanic sequestration of anthropogenic carbon dioxide is the transfer of carbon across the base of the surface mixed layer into the ocean interior, a process known as subduction. However, the physical mechanisms responsible for the subduction of anthropogenic carbon dioxide are poorly understood. Here we use observationally based estimates of subduction and anthropogenic carbon concentrations in the Southern Ocean to determine the mechanisms responsible for carbon sequestration. We estimate that net subduction amounts to 0.42 ± 0.2 Pg C  yr−1 between 35° S and the marginal sea-ice zone. We show that subduction occurs in specific locations as a result of the interplay of wind-driven Ekman transport, eddy fluxes and variations in mixed-layer depth. The zonal distribution of the estimated subduction is consistent with the distribution of anthropogenic carbon dioxide in the ocean interior. We conclude that oceanic carbon sequestration depends on physical properties, such as mixed-layer depth, ocean currents, wind and eddies, which are potentially sensitive to climate variability and change.
PY 2012
PD AUG
SO Nature Geoscience
SN 1752-0894
PU Nature Publishing Group
VL 5
IS 8
UT 000307099000018
BP 579
EP 584
DI 10.1038/NGEO1523
ID 25129
ER

EF