FN Archimer Export Format
PT J
TI Carbon isotope offsets between benthic foraminifer species of the genus Cibicides (Cibicidoides) in the glacial sub-Antarctic Atlantic
BT 
AF GOTTSCHALK, Julia
   RIVEIROS, Natalia Vazquez
   WAELBROECK, Claire
   SKINNER, Luke C.
   MICHEL, Elisabeth
   DUPLESSY, Jean-Claude
   HODELL, David
   MACKENSEN, Andreas
AS 1:1,2,3;2:1,4;3:4;4:1;5:4;6:4;7:1;8:5;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 Univ Cambridge, Dept Earth Sci, Godwin Lab Palaeoclimate Res, Cambridge, England.
   Univ Bern, Inst Geol Sci, Bern, Switzerland.
   Univ Bern, Oeschger Ctr Climate Change Res, Bern, Switzerland.
   Univ Paris Saclay, CNRS CEA UVSQ, Lab Sci Climat & Environm, LSCE IPSL, Gif Sur Yvette, France.
   Alfred Wegener Inst Polar & Marine Res, Bremerhaven, Germany.
C2 UNIV CAMBRIDGE, ENGLAND
   UNIV BERN, SWITZERLAND
   UNIV BERN, SWITZERLAND
   UNIV PARIS SACLAY, FRANCE
   INST A WEGENER, GERMANY
IF 3.254
TC 35
UR https://archimer.ifremer.fr/doc/00421/53207/54927.pdf
   https://archimer.ifremer.fr/doc/00421/53207/54928.pdf
LA English
DT Article
CR VT 90 / SOUC
BO Marion Dufresne
AB Epibenthic foraminifer delta C-13 measurements are valuable for reconstructing past bottom water dissolved inorganic carbon d13C (delta C-13(DIC)), which are used to infer global ocean circulation patterns. Epibenthic delta C-13, however, may also reflect the influence of C-13-depleted phytodetritus, microhabitat changes, and/or variations in carbonate ion concentrations. Here we compare the delta C-13 of two benthic foraminifer species, Cibicides kullenbergi and Cibicides wuellerstorfi, and their morphotypes, in three sub-Antarctic Atlantic sediment cores over several glacial-interglacial transitions. These species are commonly assumed to be epibenthic, living above or directly below the sediment-water interface. While this might be consistent with the small delta C-13 offset that we observe between these species during late Pleistocene interglacial periods (Delta delta C-13=-0.19 +/- 0.31%, N=63), it is more difficult to reconcile with the significant delta C-13 offset that is found between these species during glacial periods (Delta delta C-13=-0.76 +/- 0.44%, N=44). We test possible scenarios by analyzing Uvigerina spp delta C-13 and benthic foraminifer abundances: (1) C. kullenbergi delta C-13 is biased to light values either due to microhabitat shifts or phytodetritus effects and (2) C. wuellerstorfi delta C-13 is biased to heavy values, relative to long-term average conditions, for instance by recording the sporadic occurrence of less depleted deepwater delta C-13(DIC). Neither of these scenarios can be ruled out unequivocally. However, our findings emphasize that supposedly epibenthic foraminifer delta C-13 in the sub-Antarctic Atlantic may reflect several factors rather than being solely a function of bottom water delta C-13(DIC). This could have a direct bearing on the interpretation of extremely light South Atlantic delta C-13 values at the Last Glacial Maximum. 
PY 2016
PD DEC
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 31
IS 12
UT 000393173000005
BP 1583
EP 1602
DI 10.1002/2016PA003029
ID 53207
ER

EF