Towards operational 3D-Var assimilation of chlorophyll Biogeochemical-Argo float data into a biogeochemical model of the Mediterranean Sea
| Autor: | Laura Mariotti, Vincent Taillandier, Gianpiero Cossarini, Alexandre Mignot, Anna Teruzzi, Laura Feudale, Fabrizio D'Ortenzio, Stefano Salon |
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| Přispěvatelé: | Istituto Nazionale di Geofisica e di Oceanografia Sperimentale (OGS), Laboratoire d'océanographie de Villefranche (LOV), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Istituto di Scienze Marine [La Spezia] (CNR-ISMAR-SP), Istituto di Science Marine (ISMAR ), Consiglio Nazionale delle Ricerche (CNR)-Consiglio Nazionale delle Ricerche (CNR) |
| Rok vydání: | 2019 |
| Předmět: |
Chlorophyll
Mediterranean climate Atmospheric Science Biogeochemical cycle Biogeochemical model 010504 meteorology & atmospheric sciences Oceanography Atmospheric sciences 01 natural sciences chemistry.chemical_compound Mediterranean sea Data assimilation [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Phytoplankton Mediterranean Sea Computer Science (miscellaneous) Marine ecosystem 14. Life underwater [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Argo 0105 earth and related environmental sciences Biogeochemical-Argo float 010505 oceanography Geotechnical Engineering and Engineering Geology chemistry Environmental science |
| Zdroj: | Ocean Modelling Ocean Modelling, Elsevier, 2019, 133, pp.112-128. ⟨10.1016/j.ocemod.2018.11.005⟩ |
| ISSN: | 1463-5003 |
| DOI: | 10.1016/j.ocemod.2018.11.005 |
| Popis: | International audience; The emerging availability of Biogeochemical-Argo (BGC-Argo) float data creates new opportunities to combine models and observations in investigations of the interior structures and dynamics of marine ecosystems. An existing variational data assimilation scheme (3DVarBio) has been upgraded and coupled with the Copernicus Marine Environment Monitoring Service biogeochemical model of the Mediterranean Sea to assimilate BGC-Argo chlorophyll profile observations. Our results show that the assimilation of BGC-Argo float data is feasible. Moreover, the proposed data assimilation framework provides significant corrections to the chlorophyll concentrations and is able to consistently readjust the shapes of chlorophyll profiles during surface blooms occurring in winter vertically mixed conditions, and in the case of the summer deep chlorophyll maxima. Sensitivity analysis and diagnostic metrics have been applied to evaluate the impact of assimilation and the relevance of different factors of the 3DVarBio method. A key factor is the observation error that has been tuned on a monthly basis to incorporate the representation error. Different frequencies of the assimilation cycle have been tested: daily or 3-day assimilation fosters the highest skill performances despite the reduced impacts and the increase of computational burden. Considering the present size of the BGC-Argo Mediterranean network (about 15 floats) and the estimated non-homogeneous correlation radius length scale (15.2 km on average), the chlorophyll assimilation can constrain the phytoplankton dynamics along the whole water column over an area up to 10% of the Mediterranean Sea. |
| Databáze: | OpenAIRE |
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