Revisiting "Nutrient Trapping" in global coupled biogeochemical Ocean Circulation Models

Dietze, Heiner and Löptien, Ulrike (2012) Revisiting "Nutrient Trapping" in global coupled biogeochemical Ocean Circulation Models [Poster] In: AGU Fall Meeting 2012, 03.-07.12.2012, San Francisco, USA.

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Abstract

The eastern equatorial Pacific puts our understanding of the interactions between atmosphere, ocean, and pelagic biogeochemical cycling, as expressed in numerical models, to the test. Major, well-known and notorious, problems are a spurious double-split ITCZ and a deficient representation of the "cold-tongue".
Maybe less prominent is the problem of subsurface nutrients being biased at depth, dubbed "nutrient trapping" by Najjar (1992) already. Based on an exhaustive (in total 71) combination of ocean-circulation model configurations with differing biogeochemical formulations we show (1) "nutrient trapping" is a persistent problem ever since the first global coupled ocean-carbon models (featuring a realistic ocean topography and a rough representation of biotic effects on carbon cycles) were developed. (2) "Nutrient trapping" retards projections of the marine nitrogen and associated carbon cycle. (3) At least part of the "nutrient trapping" endemic to coupled biogeochemical ocean circulation models is related to a spuriously damped equatorial Intermediate Current System -- even in our eddy-permitting simulation.

Document Type: Conference or Workshop Item (Poster)
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
Date Deposited: 11 Dec 2012 13:52
Last Modified: 11 Dec 2012 13:52
URI: http://eprints.uni-kiel.de/id/eprint/19662

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