FN Archimer Export Format
PT J
TI Marine productivity response to Heinrich events: a model-data comparison
BT 
AF MARIOTTI, V.
   BOPP, L.
   TAGLIABUE, A.
   KAGEYAMA, M.
   SWINGEDOUW, D.
AS 1:1;2:1;3:1,2,3;4:1;5:1;
FF 1:;2:;3:;4:;5:;
C1 Ctr Etud Saclay, CNRS, UVSQ, Lab Sci Climat & Environm,IPSL,CEA,UMR8212, F-91191 Gif Sur Yvette, France.
   Univ Cape Town, Dept Oceanog, ZA-7701 Cape Town, South Africa.
   CSIR, So Ocean Climate & Carbon Observ, ZA-7599 Stellenbosch, South Africa.
C2 UNIV VERSAILLES, FRANCE
   UNIV CAPE TOWN, SOUTH AFRICA
   CSIR (SOUTH AFRICA), SOUTH AFRICA
IN DOAJ
IF 3.56
TC 22
UR https://archimer.ifremer.fr/doc/00266/37695/35833.pdf
   https://archimer.ifremer.fr/doc/00266/37695/35834.pdf
LA English
DT Article
CR IMAGES 1-MD101
   IMAGES 3-IPHIS-MD106
   MD 122 / WEPAMA
   MD 126 / MONA
   MD 140 / PRIVILEGE
BO Marion Dufresne
AB Marine sediments records suggest large changes in marine productivity during glacial periods, with abrupt variations especially during the Heinrich events. Here, we study the response of marine biogeochemistry to such an event by using a biogeochemical model of the global ocean (PISCES) coupled to an ocean-atmosphere general circulation model (IPSL-CM4). We conduct a 400-yr-long transient simulation under glacial climate conditions with a freshwater forcing of 0.1 Sv applied to the North Atlantic to mimic a Heinrich event, alongside a glacial control simulation. To evaluate our numerical results, we have compiled the available marine productivity records covering Heinrich events. We find that simulated primary productivity and organic carbon export decrease globally (by 16% for both) during a Heinrich event, albeit with large regional variations. In our experiments, the North Atlantic displays a significant decrease, whereas the Southern Ocean shows an increase, in agreement with paleo-productivity reconstructions. In the Equatorial Pacific, the model simulates an increase in organic matter export production but decreased biogenic silica export. This antagonistic behaviour results from changes in relative uptake of carbon and silicic acid by diatoms. Reasonable agreement between model and data for the large-scale response to Heinrich events gives confidence in models used to predict future centennial changes in marine production. In addition, our model allows us to investigate the mechanisms behind the observed changes in the response to Heinrich events.
PY 2012
SO Climate Of The Past
SN 1814-9324
PU Copernicus Gesellschaft Mbh
VL 8
IS 5
UT 000310470600015
BP 1581
EP 1598
DI 10.5194/cp-8-1581-2012
ID 37695
ER

EF