FN Archimer Export Format
PT J
TI From monsoon to marine productivity in the Arabian Sea: insights from glacial and interglacial climates
BT 
AF LE MEZO, Priscilla
   BEAUFORT, Luc
   BOPP, Laurent
   BRACONNOT, Pascale
   KAGEYAMA, Masa
AS 1:1;2:2;3:1;4:1;5:1;
FF 1:;2:;3:;4:;5:;
C1 Ctr CEA Saclay, CEA CNRS UVSQ, UMR 8112, LSCE IPSL, F-91191 Gif Sur Yvette, France.
   Aix Marseille Univ, IRD, CNRS, CEREGE,UMR 7330, Av Louis Philibert,BP80, Aix En Provence, France.
C2 CEA, FRANCE
   UNIV AIX MARSEILLE, FRANCE
IN DOAJ
IF 3.174
TC 17
UR https://archimer.ifremer.fr/doc/00420/53146/55345.pdf
   https://archimer.ifremer.fr/doc/00420/53146/55346.pdf
LA English
DT Article
CR MD 143 / CHAMAK
BO Marion Dufresne
AB The current-climate Indian monsoon is known to boost biological productivity in the Arabian Sea. This paradigm has been extensively used to reconstruct past monsoon variability from palaeo-proxies indicative of changes in surface productivity. Here, we test this paradigm by simulating changes in marine primary productivity for eight contrasted climates from the last glacial-interglacial cycle. We show that there is no straightforward correlation between bo-real summer productivity of the Arabian Sea and summer monsoon strength across the different simulated climates. Locally, productivity is fuelled by nutrient supply driven by Ekman dynamics. Upward transport of nutrients is modulated by a combination of alongshore wind stress intensity, which drives coastal upwelling, and by a positive wind stress curl to the west of the jet axis resulting in upward Ekman pumping. To the east of the jet axis there is however a strong downward Ekman pumping due to a negative wind stress curl. Consequently, changes in coastal along-shore stress and/ or curl depend on both the jet intensity and position. The jet position is constrained by the Indian summer monsoon pattern, which in turn is influenced by the astronomical parameters and the ice sheet cover. The astronomical parameters are indeed shown to impact wind stress intensity in the Arabian Sea through large-scale changes in the meridional gradient of upper-tropospheric temperature. However, both the astronomical parameters and the ice sheets affect the pattern of wind stress curl through the position of the sea level depression barycentre over the monsoon region (20-150 degrees W, 30 degrees S-60 degrees N). The combined changes in monsoon intensity and pattern lead to some higher glacial productivity during the summer season, in agreement with some palaeo-productivity reconstructions. 
PY 2017
PD JUN
SO Climate Of The Past
SN 1814-9324
PU Copernicus Gesellschaft Mbh
VL 13
IS 7
UT 000404783800001
BP 759
EP 778
DI 10.5194/cp-13-759-2017
ID 53146
ER

EF