Model-derived estimates of new production: New results point towards lower values.

Oschlies, Andreas (2001) Model-derived estimates of new production: New results point towards lower values. Deep Sea Research Part II: Topical Studies in Oceanography, 48 (10). pp. 2173-2197. DOI 10.1016/S0967-0645(00)00184-3.

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Abstract

Model-derived estimates of marine new production are found to display systematic covariations with the underlying model architecture. Almost regardless of the formulation of biogeochemical processes, model-derived estimates of new production have more than doubled from about Full-size image (<1 K) to values around Full-size image (<1 K) when turning from early box models to more recent investigations using coarse-resolution general circulation models. Because none of these models resolves eddies, which have been shown to enhance biological production, a further increase in simulated new production with increasing model resolution might be expected. This study presents results from an eddy-permitting coupled biological–physical model that suggest a basin-scale new production of less than Full-size image (<1 K) for the North Atlantic, i.e. substantially less than values typical for coarse-resolution models. Sensitivity experiments reveal that the amount of diapycnal mixing, described either explicitly or implicitly in the numerical discretization schemes, has a considerable effect on the simulated input of nutrients into the euphotic zone. Implications for coarse-resolution models used until now are that unrealistically high levels of explicit and implicit diapycnal diffusion may have been responsible for unrealistically high estimates of new production.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/S0967-0645(00)00184-3
ISSN: 0967-0645
Projects: JGOFS
Date Deposited: 18 Feb 2008 17:25
Last Modified: 30 Sep 2016 10:37
URI: http://oceanrep.geomar.de/id/eprint/1480

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