Merged series of normalized water leaving radiances obtained from multiple satellite missions for the Mediterranean Sea

Details Merged series of normalized water leaving radiances obtained from multiple satellite missions for the Mediterranean Sea Merged series of normalized water leaving radiances obtained from multiple satellite missions for the Mediterranean Sea

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009adspr..43..423m&link_type=abstract

Advances in Space Research, Volume 43, Issue 3, p. 423-437.

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Merging time series of ocean color-derived products provided by independent satellite missions supports related biogeochemical and environmental applications by combining temporally overlapping data sets and by increasing data coverage. The creation of a merged series of normalized water leaving radiances L, the primary ocean color product, is presented for the Mediterranean Sea using the SeaWiFS and MODIS data records. The merging relies on an optically-based technique that combines the available L signal in a spectrally consistent way. Validation statistics indicate uncertainties associated with the merged L decreasing from 23% at 412 nm to 12% in the 500- to 555-nm spectral range. The inter-comparison of the sensor-specific products, conducted at the scale of the basin for daily-to-monthly time scales, indicates an overall consistency. The level of differences varies with the wavelength considered and shows a marked seasonal cycle, with differences that tend to be higher in winter. The merged series is remarkably consistent with the sensor-specific data, with average absolute percent differences lower than 10% for all wavelengths below 555 nm. The benefit of merging in terms of sampling frequency over the basin is also illustrated. A merged series of L data based on the two considered missions provides valid data over 36% of the basin area on a daily basis.

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