The colour of the Mediterranean Sea: Global versus regional bio-optical algorithms evaluation and implication for satellite chlorophyll estimates (Articolo in rivista)

Type

• Articolo in rivista (Classe)
• Prodotto della ricerca (Classe)

Label

• The colour of the Mediterranean Sea: Global versus regional bio-optical algorithms evaluation and implication for satellite chlorophyll estimates (Articolo in rivista) (literal)

Anno

• 2007-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

• 10.1016/j.rse.2006.10.017 (literal)

Alternative label

• Volpe G. (a); Santoleri R. (a); Vellucci V. (b); Ribera d'Alcalà M. (b); Marullo S. (c); D'Ortenzio F. (d) (2007)
  The colour of the Mediterranean Sea: Global versus regional bio-optical algorithms evaluation and implication for satellite chlorophyll estimates
  in Remote sensing of environment
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Volpe G. (a); Santoleri R. (a); Vellucci V. (b); Ribera d'Alcalà M. (b); Marullo S. (c); D'Ortenzio F. (d) (literal)

Pagina inizio

• 625 (literal)

Pagina fine

• 638 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 107 (literal)

Rivista

• Remote sensing of environment (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

• 4 (literal)

Note

• Scopu (literal)
• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• (a) Istituto di Scienze dell'Atmosfera e del Clima (ISAC), Roma, Italy (b) Stazione Zoologica 'A. Dohrn' (SZN), Napoli, Italy (c) Ente per le Nuove tecnologie l'Energia e l'Ambiente (ENEA), Dipartimento Ambiente, CR Frascati, Frascati, Italy (d) Observatoire de Villefranche sur Mer, Villefranche, France (literal)

Titolo

• The colour of the Mediterranean Sea: Global versus regional bio-optical algorithms evaluation and implication for satellite chlorophyll estimates (literal)

Abstract

• In this paper, uncertainties in the retrieval of satellite surface chlorophyll concentrations in the Mediterranean Sea have been evaluated using both regional and global ocean colour algorithms. The rationale for this effort was to define the most suitable ocean colour algorithm for the reprocessing of the entire SeaWiFS archive over the Mediterranean region where standard algorithms were demonstrated to be inappropriate. Using a large dataset of coincident in situ chlorophyll and optical measurements, covering most of the trophic regimes of the basin, we validated two existing regional algorithms [Bricaud, A., E. Bosc, and D. Antoine, 2002. Algal biomass and sea surface temperature in the Mediterranean Basin - Intercomparison of data from various satellite sensors, and implications for primary production estimates. Remote Sensing of Environment, 81(2-3), 163-178.; D'Ortenzio, F., S. Marullo, M. Ragni, M. R. d'Alcala, and R. Santoleri, 2002. Validation of empirical SeaWiFS algorithms for chlorophyll-alpha retrieval in the Mediterranean Sea - A case study for oligotrophic seas. Remote Sensing of Environment, 82(1), 79-94.] and the global algorithm OC4v4 used for standard NASA SeaWiFS products. The results of our analysis confirmed that the OC4v4 performs worse than the two existing regional algorithms. Nonetheless, these two regional algorithms do show uncertainties dependent on chlorophyll values. Then, we introduced a better tuned algorithm, the MedOC4. Using an independent set of in situ chlorophyll data, we quantified the uncertainties in SeaWiFS chlorophyll estimates using the existing and new regional algorithms. The results confirmed that MedOC4 is the best algorithm matching the requirement of unbiased satellite chlorophyll estimates and improving the percentage of the satellite uncertainty, and that the NASA standard chlorophyll products are affected by an uncertainty of the order of 100%. Moreover, the analysis suggests that the poor quality of the SeaWiFS chlorophyll in the Mediterranean is not due to the atmospheric correction term but to peculiarities in the optical properties of the water column. Finally the observed discrepancy between the global and the regional bio-optical algorithms has been discussed analysing the differences between the two in situ datasets used for tuning the algorithms (SeaBASS versus ours). The main results are that methodological differences in the two datasets cannot play a major role and the inherent bio-optical properties of the basin can explain the observed discrepancy. In particular the oligotrophic water of the Mediterranean Sea is less blue (30%) and greener (15%) than the global ocean. (literal)

Prodotto di

• Osservazioni e monitoraggio del mare da dati satellitari (TA.P07.016.003) (Modulo)
• Institute of atmospheric sciences and climate (ISAC) (Istituto)
• dinamica marina e produttività biologica da misure satellitari (TA.P04.017.003) (Modulo)

Autore CNR

• GIANLUCA VOLPE (Persona)
• ROSALIA SANTOLERI (Unità di personale interno)

Insieme di parole chiave

• Parole chiave di "The colour of the Mediterranean Sea: Global versus regional bio-optical algorithms evaluation and implication for satellite chlorophyll estimates" (Insieme di parole chiave)

Incoming links:

Prodotto

• Institute of atmospheric sciences and climate (ISAC) (Istituto)
• dinamica marina e produttività biologica da misure satellitari (TA.P04.017.003) (Modulo)
• Osservazioni e monitoraggio del mare da dati satellitari (TA.P07.016.003) (Modulo)

Autore CNR di

• ROSALIA SANTOLERI (Unità di personale interno)
• GIANLUCA VOLPE (Persona)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Remote sensing of environment (Rivista)

Insieme di parole chiave di

• Parole chiave di "The colour of the Mediterranean Sea: Global versus regional bio-optical algorithms evaluation and implication for satellite chlorophyll estimates" (Insieme di parole chiave)