FN Archimer Export Format
PT J
TI Decadal biogeochemical changes in the subtropical Indian Ocean associated with Subantarctic Mode Water
BT 
AF ALVAREZ, M.
   TANHUA, T.
   BRIX, H.
   LO MONACO, C.
   METZL, N.
   MCDONAGH, E. L.
   BRYDEN, H. L.
AS 1:1;2:2;3:3;4:4;5:4;6:5;7:5;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Inst Espanol Ocean, E-15008 La Coruna, Spain.
   IFM GEOMAR, D-24105 Kiel, Germany.
   Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA.
   Univ Paris 06, LOCEAN IPSL, F-75252 Paris 05, France.
   Univ Southampton, NOCS, Southampton SO14 3ZH, Hants, England.
C2 INST ESPANOL OCEAN, SPAIN
   IFM GEOMAR, GERMANY
   UNIV CALIF LOS ANGELES, USA
   UNIV PARIS 06, FRANCE
   UNIV SOUTHAMPTON, UK
TC 13
UR https://archimer.ifremer.fr/doc/00253/36400/34942.pdf
LA English
DT Article
CR OISO 8
   OISO1
   OISO2
   OISO3-NIVMER98
   OISO4 (VT 46)
   OISO5 (VT 49)
   VT 51 / OISO 6
   VT 57 / OISO 9
BO Marion Dufresne
DE ;Indian Ocean;Subantarctic Mode Water;biogeochemistry
AB Within the Subantarctic Mode Water (SAMW) density level, we study temporal changes in salinity, nutrients, oxygen and TTD (Transit Time Distribution) ages in the western (W) and eastern (E) subtropical gyre of the Indian Ocean (IO) from 1987 to 2002. Additionally, changes in Total Alkalinity (TA) and Dissolved Inorganic Carbon (DIC) are evaluated between 1995 and 2002. The mechanisms behind the detected changes are discussed along with the results from a hindcast model run (Community Climate System Model). The increasing salinity and decreasing oxygen trends from 1960 to 1987 reversed from 1987 to 2002 along the gyre. In the W-IO a decreasing trend in TTD ages points to a faster delivery of SAMW, thus less biogenic matter remineralization, explaining the oxygen increase and noisier nutrients decrease. In the E-IO SAMW, no change in TTD ages was detected, therefore the trends in oxygen and inorganic nutrients relate to changes in the Antarctic Surface Water transported into the E-IO SAMW formation area. In the W-IO between 1995 and 2002, the DIC increase is equal or even less than the anthropogenic input as the reduction in remineralization contributes to mask the increasing trend. In the E-IO between 1995 and 2002, DIC decreases slightly despite the increase in the anthropogenic input. Differences in the preformed E-IO SAMW conditions would explain this behavior. Trends in the W and E IO SAMW are decoupled and related to different forcing mechanisms in the two main sites of SAMW formation in the IO, at 40 degrees S-70 degrees E and 45 degrees S-90 degrees E, respectively.
PY 2011
PD SEP
SO Journal Of Geophysical Research-oceans
SN 0148-0027
PU Amer Geophysical Union
VL 116
IS C9/C09016
UT 000295132800001
BP 1
EP 13
DI 10.1029/2010JC006475
ID 36400
ER

EF