FN Archimer Export Format
PT J
TI Dynamics of the Carbonate System Across the Peruvian Oxygen Minimum Zone
BT 
AF Hernandez-Ayon, Jose M.
   Paulmier, Aurélien
   Garcon, Veronique
   Sudre, Joel
   Montes, Ivonne
   Chapa-Balcorta, Cecilia
   Durante, Giovanni
   Dewitte, Boris
   Maes, Christophe
   Bretagnon, Marine
AS 1:1;2:2;3:9;4:9;5:3;6:4;7:1;8:5,6,7,10;9:8,10;10:11;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Ensenada, Mexico
   LEGOS, CNRS/IRD/UPS/CNES UMR 5566, Université de Toulouse, Toulouse, France
   Instituto Geofísico del Peru, Lima, Peru
   Facultad de Ciencias Marinas, Universidad del Mar, Oaxaca, Mexico
   Centro de Estudios Avanzado en Zonas Áridas (CEAZA), Coquimbo, Chile
   Departamento de Biología, Facultad de Ciencias del Mar, Universidad Católica del Norte, Coquimbo, Chile
   Millennium Nucleus for Ecology and Sustainable Management of Oceanic Islands (ESMOI), Coquimbo, Chile
   LOPS (Univ. Brest/IRD/CNRS/IFREMER), Plouzané, France
   LEGOS, CNRS/IRD/UPS/CNES UMR 5566, Université de Toulouse, Toulouse, France
   LEGOS, CNRS/IRD/UPS/CNES UMR 5566, Université de Toulouse, Toulouse, France
   LEGOS, CNRS/IRD/UPS/CNES UMR 5566, Université de Toulouse, Toulouse, France
C2 UNIV AUTONOMA BAJA CALIFORNIA, MEXICO
   OBSERV MIDI PYRENEES, FRANCE
   INST GEOFISICO PERU, PERU
   UNIV DEL MAR, MEXICO
   CEAZA, CHILE
   UNIV CATOLIC NORTE, CHILE
   ESMOI, CHILE
   IRD, FRANCE
   CNRS, FRANCE
   IRD, FRANCE
   UNIV TOULOUSE, FRANCE
UM LOPS
IN WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-int-hors-europe
   copubli-sud
IF 5.247
TC 9
UR https://archimer.ifremer.fr/doc/00588/70004/67919.pdf
LA English
DT Article
CR AMOP
BO L'Atalante
DE ;OMZ;DIC;pH;omega aragonite;upwelling Peruvian system
AB The oxygen minimum zone (OMZ) of Peru is recognized as a source of CO2 to the atmosphere due to upwelling that brings water with high concentrations of dissolved inorganic carbon (DIC) to the surface. However, the influence of OMZ dynamics on the carbonate system remains poorly understood given a lack of direct observations. This study examines the influence of a coastal Eastern South Pacific OMZ on carbonate system dynamics based on a multidisciplinary cruise that took place in 2014. During the cruise, onboard DIC and pH measurements were used to estimate pCO2 and to calculate the calcium carbonate saturation state (Ω aragonite and calcite). South of Chimbote (9°S), water stratification decreased and both the oxycline and carbocline moved from 150 m depth to 20–50 m below the surface. The aragonite saturation depth was observed to be close to 50 m. However, values <1.2 were detected close to 20 m along with low pH (minimum of 7.5), high pCO2 (maximum 1,250 μatm), and high DIC concentrations (maximum 2,300 μmol kg−1). These chemical characteristics are shown to be associated with Equatorial Subsurface Water (ESSW). Large spatial variability in surface values was also found. Part of this variability can be attributed to the influence of mesoscale eddies, which can modify the distribution of biogeochemical variables, such as the aragonite saturation horizon, in response to shallower (cyclonic eddies) or deeper (anticyclonic eddies) thermoclines. The analysis of a 21-year (1993–2014) data set of mean sea surface level anomalies (SSHa) derived from altimetry data indicated that a large variance associated with interannual timescales was present near the coast. However, 2014 was characterized by weak Kelvin activity, and physical forcing was more associated with eddy activity. Mesoscale activity modulates the position of the upper boundary of ESSW, which is associated with high DIC and influences the carbocline and aragonite saturation depths. Weighing the relative importance of each individual signal results in a better understanding of the biogeochemical processes present in the area. 
PY 2019
PD OCT
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media SA
VL 6
IS 617
UT 000490444700001
DI 10.3389/fmars.2019.00617
ID 70004
ER

EF