Assessment of the spectral downward irradiance at the surface of the Mediterranean Sea using the radiative Ocean-Atmosphere Spectral Irradiance Model (OASIM)

Type Article
Date 2021-05
Language English
Author(s) Lazzari PaoloORCID1, Salon Stefano1, Terzić ElenaORCID1, Gregg Watson W.2, D'Ortenzio Fabrizio3, Vellucci VincenzoORCID4, Organelli EmanueleORCID3, 5, Antoine David3, 6
Affiliation(s) 1 : National Institute of Oceanography and Applied Geophysics – OGS, Trieste, Italy
2 : Global Modeling and Assimilation Office, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, United States
3 : Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, LOV, 06230, Villefranche-sur-Mer, France
4 : Sorbonne Université, CNRS, Institut de la Mer de Villefranche, IMEV, 06230, Villefranche-sur-Mer, France
5 : Istituto di Scienze Marine (ISMAR), Consiglio Nazionale delle Ricerche (CNR), Via Fosso del Cavaliere 100, 00133 Rome, Italy
6 : Remote Sensing and Satellite Research Group, School of Earth and Planetary Sciences, Curtin University, Perth, WA 6845, Australia
Source Ocean Science (1812-0784) (Copernicus GmbH), 2021-05 , Vol. 17 , N. 3 , P. 675-697
DOI 10.5194/os-17-675-2021
WOS© Times Cited 5
Note Biogeochemistry in the BGC-Argo era: from process studies to ecosystem forecasts (BG/OS inter-journal SI) Editor(s): Paolo Lazzari, Giorgio Dall'Olmo, Alexandre Mignot, and Piers Chapman Special issue jointly organized between Biogeosciences and Ocean Science

A multiplatform assessment of the Ocean–Atmosphere Spectral Irradiance Model (OASIM) radiative model focussed on the Mediterranean Sea for the period 2004–2017 is presented. The BOUée pour l'acquiSition d'une Série Optique à Long termE (BOUSSOLE) mooring and biogeochemical Argo (BGC-Argo) float optical sensor observations are combined with model outputs to analyse the spatial and temporal variabilities in the downward planar irradiance at the ocean–atmosphere interface. The correlations between the data and model are always higher than 0.6. With the exception of downward photosynthetic active radiation and the 670 nm channel, correlation values are always higher than 0.8 and, when removing the inter-daily variability, they are higher than 0.9. At the scale of the BOUSSOLE sampling (15 min temporal resolution), the root mean square difference oscillates at approximately 30 %–40 % of the averaged model output and is reduced to approximately 10 % when the variability between days is filtered out. Both BOUSSOLE and BGC-Argo indicate that bias is up to 20 % for the irradiance at 380 and 412 nm and for wavelengths above 670 nm, whereas it decreases to less than 5 % at the other wavelengths. Analysis of atmospheric input data indicates that the model skill is strongly affected by cloud dynamics. High skills are observed during summer when the cloud cover is low.

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Lazzari Paolo, Salon Stefano, Terzić Elena, Gregg Watson W., D'Ortenzio Fabrizio, Vellucci Vincenzo, Organelli Emanuele, Antoine David (2021). Assessment of the spectral downward irradiance at the surface of the Mediterranean Sea using the radiative Ocean-Atmosphere Spectral Irradiance Model (OASIM). Ocean Science, 17(3), 675-697. Publisher's official version : , Open Access version :