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Modelling the upper-ocean glacial-interglacial changes of organic and dissolved inorganic carbon

AuthorsPelegrí, Josep Lluís CSIC ORCID ; Olivella, Roger CSIC ORCID; García-Olivares, Antonio CSIC ORCID ; de la Fuente, P.
Issue Date15-Oct-2010
CitationEOF 2010 I Encuentro de la Oceanografía Física Española. Libro de resúmenes: 155 (2010)
AbstractWe present an idealized two‐box model of the ocean that simulates the glacialinterglacial transitions in carbon supply and carbon transformation in the upper ocean. The amount of dissolved carbon in the upper ocean is expressed as organic plus inorganic carbon, each fraction depending on the supply of inorganic carbon from the deep ocean, removal of total carbon to the deep ocean, and on the rate of respiration less primary production. The model results in a system of two coupled partial differential equations for the rates of change of organic carbon and inorganic carbon in the upper ocean, its solution depending on two parameters: the rate of recirculation between the upper and deep oceans (the intensity of the thermohaline conveyor belt) and the level of inorganic carbon concentration to be attained during each glacial or interglacial stage (specified after the time‐series of atmospheric CO2, by assuming it mirrors the upper‐ocean concentration of dissolved inorganic carbon). We present the solution of the model for the last four glacial‐interglacial cycles (about 450 thousand years). The simulated series of inorganic carbon fits rather well the atmospheric CO2 (with correlations over 0.8), showing that the fast increase during a glacial‐interglacial transition is largely the result of a much swifter recirculation that brings less diluted deep inorganic carbon. The model also shows that early in the glacial interglacial transition respiration is maximum, followed by a maximum in net primary production once the system approaches steady state during the interglacial maximum. During the interglacialglacial transition the organic carbon progressively builds up in the upper ocean until it reaches maximum values by the end of the glacial period
DescriptionI Encuentro de la Oceanografía Física Española (EOF), 13-15 de octubre 2010, Barcelona
Publisher version (URL)http://www.locea.org/index.php/noticias/eventos/51-libro-de-resumenes
Appears in Collections:(ICM) Comunicaciones congresos
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