Dynamics of the carbonate system across the Peruvian Oxygen Minimum Zone

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dc.contributor.authorHernandez-Ayon, Jose M.
dc.contributor.authorPaulmier, Aurélien
dc.contributor.authorGarcon, Veronique
dc.contributor.authorSudre, Joel
dc.contributor.authorMontes Torres, Ivonne
dc.contributor.authorChapa-Balcorta, Cecilia
dc.contributor.authorDurante, Giovanni
dc.contributor.authorDewitte, Boris
dc.contributor.authorMaes, Cristophe
dc.contributor.authorBretagnon, Marine
dc.date.accessioned2020-02-27T16:44:46Z
dc.date.available2020-02-27T16:44:46Z
dc.date.issued2019-10-16
dc.description.abstractThe 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 (9ºS), water stratification decreased and both the oxycline and carbocline moved from 150m depth to 20–50m below the surface. The aragonite saturation depth was observed to be close to 50m. However, values <1.2 were detected close to 20m along with low pH (minimum of 7.5), high pCO2 (maximum 1,250μatm), 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.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationHernandez-Ayon, J. M., Paulmier, A., Garcon, V., Sudre, J., Montes, I., Chapa-Balcorta, C., ... Bretagnon, M. (2019). Dynamics of the carbonate system across the Peruvian Oxygen Minimum Zone.==$Frontiers in Marine Science, 6,$==617. https://doi.org/10.3389/fmars.2019.00617es_ES
dc.identifier.doihttps://doi.org/10.3389/fmars.2019.00617es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalFrontiers in Marine Sciencees_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/4767
dc.language.isoenges_ES
dc.publisherFrontiers Mediaes_ES
dc.relation.ispartofurn:issn:2296-7745
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttps://creativecommons.org/licences/by/4.0/es_ES
dc.subjectOMZes_ES
dc.subjectDICes_ES
dc.subjectpHes_ES
dc.subjectOmega aragonitees_ES
dc.subjectUpwelling peruvian systemes_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.00es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.09es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.11es_ES
dc.titleDynamics of the carbonate system across the Peruvian Oxygen Minimum Zonees_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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