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), 2173-2197. (doi:10.1016/S0967-0645(00)00184-3).
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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 0.15 molNm−2 yr−1 to values around 0.4 molNm−2 yr−1 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 0.3 molNm−2 yr−1 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.
|Subjects:||G Geography. Anthropology. Recreation > GC Oceanography|
|Divisions:||University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
|Date Deposited:||02 Dec 2004|
|Last Modified:||01 Jun 2011 08:22|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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