FN Archimer Export Format
PT J
TI Impact of oceanic circulation changes on atmospheric δ13CO2
BT 
AF MENVIEL, L.
   MOUCHET, A.
   MEISSNER, K. J.
   JOOS, F.
   ENGLAND, M. H.
AS 1:1,2;2:3,4;3:1,2;4:5,6;5:1,2;
FF 1:;2:;3:;4:;5:;
C1 Univ New S Wales, Climate Change Res Ctr, Sydney, NSW, Australia.
   ARC Ctr Excellence Climate Syst Sci, Sydney, NSW, Australia.
   IPSL CEA CNRS UVSQ, Lab Sci Climat & Environm, Gif Sur Yvette, France.
   Univ Liege, Dept Astrophys Geophys & Oceanog, Liege, Belgium.
   Univ Bern, Inst Phys, Climate & Environm Phys, Bern, Switzerland.
   Univ Bern, Oeschger Ctr Climate Change Res, Bern, Switzerland.
C2 UNIV NEW S WALES, AUSTRALIA
   ARC, AUSTRALIA
   CNRS, FRANCE
   UNIV LIEGE, BELGIUM
   UNIV BERN, SWITZERLAND
   UNIV BERN, SWITZERLAND
IF 4.495
TC 34
UR https://archimer.ifremer.fr/doc/00293/40406/38965.pdf
   https://archimer.ifremer.fr/doc/00293/40406/38966.tex
LA English
DT Article
CR OISO 8
   OISO1
   OISO2
   OISO3-NIVMER98
   OISO4 (VT 46)
   OISO5 (VT 49)
   VT 105 / OISO 17
   VT 108 / OISO-18
   VT 114 / OISO-19
   VT 117 / OISO-20
   VT 120 / OISO-21
   VT 127 / OISO-22
   VT 136 / OISO-23
   VT 142 / OISO-24
   VT 51 / OISO 6
   VT 57 / OISO 9
   VT 60 / CARAUS - OISO 10
   VT 62 / CARAUS - OISO 11
   VT 79 / OISO 12
   VT 80 / OISO 13
   VT 81 / OISO 14
   VT 85 / OISO 15
   VT 94 / OISO 16
BO Marion Dufresne
AB δ13CO2 measured in Antarctic ice cores provides constraints on oceanic and terrestrial carbon cycle processes linked with millennial-scale changes in atmospheric CO2. However, the interpretation of δ13CO2 is not straightforward. Using carbon isotope-enabled versions of the LOVECLIM and Bern3D models, we perform a set of sensitivity experiments in which the formation rates of North Atlantic Deep Water (NADW), North Pacific Deep Water (NPDW), Antarctic Bottom Water (AABW) and Antarctic Intermediate Water (AAIW) are varied. We study the impact of these circulation changes on atmospheric δ13CO2 as well as on the oceanic δ13C distribution. In general, we find that the formation rates of AABW, NADW, NPDW and AAIW are negatively correlated with changes in δ13CO2: namely strong oceanic ventilation decreases atmospheric δ13CO2. However, since large scale ocean circulation reorganizations also impact nutrient utilization and the Earth's climate, the relationship between atmospheric δ13CO2 levels and ocean ventilation rate is not unequivocal. In both models atmospheric δ13CO2 is very sensitive to changes in AABW formation rates: increased AABW formation enhances the transport of low δ13C waters to the surface and decreases atmospheric δ13CO2. By contrast, the impact of NADW changes on atmospheric δ13CO2 is less robust and might be model dependent. This results from complex interplay between global climate, carbon cycle, and the formation rate of NADW, a water body characterized by relatively high δ13C.
PY 2015
PD NOV
SO Global Biogeochemical Cycles
SN 0886-6236
PU Amer Geophysical Union
VL 29
IS 11
UT 000368907500006
BP 1944
EP 1961
DI 10.1002/2015GB005207
ID 40406
ER

EF