FN Archimer Export Format
PT J
TI Reduced ventilation and enhanced magnitude of the deep Pacific carbon pool during the last glacial period
BT 
AF SKINNER, L.
   MCCAVE, I. N.
   CARTER, L.
   FALLON, S.
   SCRIVNER, A. E.
   PRIMEAU, F.
AS 1:1;2:1;3:2;4:3;5:1;6:4;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ Cambridge, Dept Earth Sci, Godwin Lab Palaeoclimate Res, Cambridge CB2 3EQ, England.
   Natl Inst Water & Atmosphere, Wellington, New Zealand.
   Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia.
   Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA USA.
C2 UNIV CAMBRIDGE, UK
   NIWA, NEW ZEALAND
   UNIV AUSTRALIAN NATL, AUSTRALIA
   UNIV CALIF IRVINE, USA
IF 4.326
TC 83
UR https://archimer.ifremer.fr/doc/00352/46279/46041.pdf
LA English
DT Article
CR IMAGES 3-IPHIS-MD106
BO Marion Dufresne
DE ;radiocarbon;ocean ventilation;carbon cycling;palaeoceanography
AB It has been proposed that the ventilation of the deep Pacific carbon pool was not significantly reduced during the last glacial period, posing a problem for canonical theories of glacial-interglacial CO2 change. However, using radiocarbon dates of marine tephra deposited off New Zealand, we show that deep(>2000 m) and shallow sub-surface ocean-atmosphere C-14 age offsets (i.e. 'reservoir-' or 'ventilation' ages) in the southwest Pacific increased by similar to 1089 and 337 yrs respectively, reaching similar to 2689 and similar to 1037 yrs during the late glacial. A comparison with other radiocarbon data from the southern high-latitudes suggests that broadly similar changes were experienced right across the Southern Ocean. If, like today, the Southern Ocean was the main source of water to the glacial ocean interior, these observations would imply a significant change in the global radiocarbon inventory during the last glacial period, possibly equivalent to an increase in the average radiocarbon age >2 km of similar to 700 yrs. Simple mass balance arguments and numerical model sensitivity tests suggest that such a change in the ocean's mean radiocarbon age would have had a major impact on the marine carbon inventory and atmospheric CO2, possibly accounting for nearly half of the glacial-interglacial CO2 change. If confirmed, these findings would underline the special role of high latitude shallow sub-surface mixing and air-sea gas exchange in regulating atmospheric CO2 during the late Pleistocene.
PY 2015
PD FEB
SO Earth And Planetary Science Letters
SN 0012-821X
PU Elsevier Science Bv
VL 411
UT 000349197500006
BP 45
EP 52
DI 10.1016/j.epsl.2014.11.024
ID 46279
ER

EF