FN Archimer Export Format
PT J
TI Evolution of South Atlantic density and chemical stratification across the last deglaciation
BT 
AF ROBERTS, Jenny
   GOTTSCHALK, Julia
   SKINNER, Luke C.
   PECK, Victoria L.
   KENDER, Sev
   ELDERFIELD, Henry
   WAELBROECK, Claire
   RIVEIROS, Natalia Vazquez
   HODELL, David A.
AS 1:1,2;2:1;3:1;4:2;5:3,4;6:1;7:5;8:5;9:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;
C1 Univ Cambridge, Dept Earth Sci, Godwin Lab Paleoclimate Res, Cambridge CB2 3EQ, England.
   British Antarctic Survey, Cambridge CB3 0ET, England.
   Univ Nottingham, Sch Geog, Ctr Environm Geochem, Nottingham NG7 2RD, England.
   British Geol Survey, Nottingham NG12 5GG, England.
   Domaine CNRS, Lab Sci Climat & Environm, F-91198 Gif Sur Yvette, France.
C2 UNIV CAMBRIDGE, ENGLAND
   BRITISH ANTARCTIC SURVEY, ENGLAND
   UNIV NOTTINGHAM, ENGLAND
   BRITISH GEOL SURVEY, ENGLAND
   CNRS, FRANCE
IF 9.661
TC 51
UR https://archimer.ifremer.fr/doc/00421/53276/54569.pdf
   https://archimer.ifremer.fr/doc/00421/53276/54570.pdf
LA English
DT Article
CR MD 158 / LOGIPEV 2007
   VT 90 / SOUC
BO Marion Dufresne
DE ;South Atlantic;density gradient;ocean stratification;last deglaciation;atmospheric CO2
AB Explanations of the glacial-interglacial variations in atmospheric pCO(2) invoke a significant role for the deep ocean in the storage of CO2. Deep-ocean density stratification has been proposed as a mechanism to promote the storage of CO2 in the deep ocean during glacial times. A wealth of proxy data supports the presence of a "chemical divide" between intermediate and deep water in the glacial Atlantic Ocean, which indirectly points to an increase in deep-ocean density stratification. However, direct observational evidence of changes in the primary controls of ocean density stratification, i.e., temperature and salinity, remain scarce. Here, we use Mg/Ca-derived seawater temperature and salinity estimates determined from temperature-corrected delta O-18 measurements on the benthic foraminifer Uvigerina spp. from deep and intermediate water-depth marine sediment cores to reconstruct the changes in density of sub-Antarctic South Atlantic water masses over the last deglaciation (i.e., 22-2 ka before present). We find that a major breakdown in the physical density stratification significantly lags the breakdown of the deep-intermediate chemical divide, as indicated by the chemical tracers of benthic foraminifer delta C-13 and foraminifer/coral C-14. Our results indicate that chemical destratification likely resulted in the first rise in atmospheric pCO(2), whereas the density destratification of the deep South Atlantic lags the second rise in atmospheric pCO(2) during the late deglacial period. Our findings emphasize that the physical and chemical destratification of the ocean are not as tightly coupled as generally assumed. 
PY 2016
PD JAN
SO Proceedings Of The National Academy Of Sciences Of The United States Of America
SN 0027-8424
PU Natl Acad Sciences
VL 113
IS 3
UT 000368458800033
BP 514
EP 519
DI 10.1073/pnas.1511252113
ID 53276
ER

EF