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Reduced-order Optimal Interpolation for Biomass Assimilation : Volume 3, Issue 3 (19/06/2006)

By Crispi, G.

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Book Id: WPLBN0004020970
Format Type: PDF Article :
File Size: Pages 37
Reproduction Date: 2015

Title: Reduced-order Optimal Interpolation for Biomass Assimilation : Volume 3, Issue 3 (19/06/2006)  
Author: Crispi, G.
Volume: Vol. 3, Issue 3
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Crispi, G., Viezzoli, D., & Pacciaroni, M. (2006). Reduced-order Optimal Interpolation for Biomass Assimilation : Volume 3, Issue 3 (19/06/2006). Retrieved from

Description: Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Italy. The analysis of the evolution of the chemical and biological characteristics of the Mediterranean marine ecosystem requires an integrated approach. Consistently, an ecosystem description, embedded in the MFSTEP one eighth degree three-dimensional general circulation model, is tested and used following a twin experiment approach. The ecosystem model is based on the NPZD trophic chain: inorganic nitrogen, N, phytoplankton, P, zooplankton, Z and detritus, D. Assimilation of synthetic biomass data is performed by means of the reduced-order optimal interpolation system SOFA.

The synthetic sea-truth data are daily averages obtained from a sixty-nine days reference run (RR). The twin experiments consist in performing two runs: a free run (FR) with wrong summer-depleted phytoplankton initial conditions and an assimilated run (AR), in which, starting from the same FR wrong phytoplankton concentrations, weekly averaged surface biomasses extracted from the RR results are assimilated.

The comparison of the FR results with the AR ones shows a good convergence, on a basin Mediterranean scale, confirming improvements of the forecasting in each of the four ecological compartments.

Regional trophic regimes are analysed and interpreted in the western and eastern Mediterranean subbasins, for explaining the deteriorating behaviour of the total nitrogen.

Reduced-order optimal interpolation for biomass assimilation


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