FN Archimer Export Format
PT J
TI Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. I: assessment and results of an optimum multiparameter analysis
BT 
AF ALVAREZ, M.
   BREA, S.
   MERCIER, Herle
   ALVAREZ-SALGADO, X. A.
AS 1:1;2:2;3:3;4:2;
FF 1:;2:;3:;4:;
C1 Inst Espanol Oceanog, Ctr A Coruna, La Coruna 15080, Spain.
   CSIC, IIM, Vigo 36208, Spain.
   IFREMER, LPO, F-29280 Brest, France.
C2 IEO, SPAIN
   CSIC, SPAIN
   CNRS, FRANCE
IF 3.025
TC 14
TU Centre national de la recherche scientifique
   Institut de recherche pour le développement
   Institut français de recherche pour l'exploitation de la mer
   Université de Bretagne Occidentale
UR https://archimer.ifremer.fr/doc/00171/28178/26414.pdf
LA English
DT Article
CR CITHER 2 LEG 1
   CITHER 2 LEG 2
   CITHER 3 LEG 1
   CITHER 3 LEG 2
BO Maurice Ewing
   L'Atalante
AB This is the first of two manuscripts dealing with the circulation, mixing, ventilation and organic matter mineralization of the South Atlantic Ocean (SAO). The present work quantifies the complex mixing of water masses in the SAO using a constrained, least-squares regression, Optimum MultiParameter (OMP) analysis. The OMP based on temperature, salinity, silicate and the conservative parameter NO, was applied on two World Ocean Circulation (WOCE) lines, A17 and A14, in the western and eastern SAO, respectively. The constrained OMP sensitivity to sources of error in the end-member characteristics, measured parameters, equation weights and oxygen to nitrogen mineralisation ratio (RN) was carefully assessed using perturbation tests. Perturbation of RN was the only test that changed significantly the mixing proportions although by less than 5%. The constrained OMP method allowed defining the realm and identifying the core-of-flow of each water mass to study its circulation, the evolution of its chemical composition and, eventually, to separate the contribution of physical and biogeochemical processes. Relevant specific outputs of this first manuscript are: (1) north of the South Equatorial Current, the silicate maximum is primarily composed of Antarctic Intermediate Water (AAIW) rather than Circumpolar Deep Water (CDW); (2) the two degree discontinuity (TDD) experiences a dramatic meridional change of water masses composition, being dominated by North Atlantic Deep Water (NADW) north of the Vema Channel and by CDW southwards; (3) the 50% proportion horizon of Weddell Sea Deep Water (WDSW), with a θ of -0.3°C at the entry of the SAO, defines the upper limit of the WSDW realm more properly than the classical isopycnals of 46.04 or 46.06 σ4, where the proportion of WSDW is around 75%.
PY 2014
PD APR
SO Progress In Oceanography
SN 0079-6611
PU Pergamon-elsevier Science Ltd
VL 123
UT 000336006100001
BP 1
EP 23
DI 10.1016/j.pocean.2013.12.007
ID 28178
ER

EF