Preformed and total phosphate in OGCMS: can right total concentrations be wrong? Implications on suboxia extension.

Duteil, Olaf , Koeve, Wolfgang and Oschlies, Andreas (2012) Preformed and total phosphate in OGCMS: can right total concentrations be wrong? Implications on suboxia extension. [Poster] In: Ocean Sciences Meeting 2012. , 20.-24.02.2012, Salt Lake City, USA .

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Abstract

A correct representation of suboxic regions in Ocean General Circulation Models can be achieved only if both ocean circulation and biology are realistic. This is usually evaluated against observed PO4 and O2 fields. PO4 in the interior of ocean is of two distinct origins. ‘Preformed PO4’ denotes phosphate unutilized by phytoplankton and subducting in regions where water masses form. ‘Remineralized PO4’ derives from the degradation of organic matter originating from the euphotic zone. Patterns of total, preformed and remineralised PO4 are controlled by ocean circulation, export production and remineralisation length scales. We perform an explicit analysis of the preformed and remineralised PO4 of seven biogeochemical ocean circulation models (OPA-PISCES, MPIOM-HAMOCC, CCSM3-BEC, MOM4-BLING, UVIC, CSIRO and MOM3) against observations (WOA). Deficiencies in the physics and high-latitude biogeochemistry are obvious from the analysis and compensated in some of the models most likely by tuning the biogeochemical model to fit PO4 fields. Inspection of total nutrients alone is hence not sufficient, since the same nutrient distribution may be achieved through very different combinations of ocean physics and biogeochemistry. Implications on suboxic regions extension are explicited.

Document Type: Conference or Workshop Item (Poster)
Keywords: Biogeochemistry
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
Date Deposited: 13 Mar 2012 06:48
Last Modified: 26 Mar 2012 09:48
URI: http://oceanrep.geomar.de/id/eprint/13975

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