The effect of marine aggregate parameterisations on global biogeochemical model performance.

Niemeyer, Daniela , Kriest, Iris and Oschlies, Andreas (2019) The effect of marine aggregate parameterisations on global biogeochemical model performance. Open Access Biogeosciences Discussions . pp. 1-29. DOI 10.5194/bg-2019-122.

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Abstract

Particle aggregation determines the particle flux length scale, possibly the marine oxygen concentration and thus affecting the volume of oxygen minimum zones (OMZs) that are of special relevance for ocean nutrient cycles and marine ecosystems, and that have been found to expand faster than can be explained by current state-of-the-art models. To investigate the impact of particle aggregation on global model performance, we carried out a sensitivity study with different parameterisations of marine aggregates and two different model resolutions. Model performance was investigated with respect to global nutrient and oxygen concentrations, as well as extent and location of OMZs. Results show that including an aggregation model improves the representation of OMZs. Moreover, we found that besides a fine spatial resolution of the model grid, the consideration of porous particles, an intermediate to high particle sinking speed and a moderate to high stickiness improve the model fit to both, global distributions of dissolved inorganic tracers and regional patterns of OMZs, compared to a model without aggregation. Our model results therefore suggest that improvements not only in the model physics, but also in the description of particle aggregation processes can play a substantial role in improving the representation of dissolved inorganic tracers and OMZs on a global scale. However, dissolved inorganic tracers are apparently not sufficient for a global model calibration, which could necessitate global model calibration against a global observational dataset of marine organic particles.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > SFB 754
Refereed: No
Open Access Journal?: Yes
DOI etc.: 10.5194/bg-2019-122
ISSN: 1810-6285
Related URLs:
Projects: SFB754
Date Deposited: 10 Apr 2019 07:22
Last Modified: 10 May 2019 09:00
URI: http://oceanrep.geomar.de/id/eprint/46324

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