Other
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.549e..16p&link_type=abstract
Proceedings of MERIS User Workshop (ESA SP-549). 10-13 November 2003, ESA-ESRIN, Frascati, Italy. Editor: H. Lacoste. Published
Other
Scientific paper
We present the preliminary results of the first stage of the project AO-594, which comprises the development and calibration of algorithms for photosynthetic pigment mapping in Spanish reservoirs. In the years 2001-2002, an extensive field campaign was made in 36 reservoirs and lakes in order to obtain a database of Rrs spectra (400-1000 nm), photosynthetic pigments concentration and phytoplankton composition. The sampled water bodies cover a wide range of environmental conditions, trophic levels and phytoplankton communities. As a first approach in algorithm development, we have explored the relationships between ratios of MERIS bands and pigment concentrations through simple linear regression analysis. The bands have been selected based on the spectral properties of each pigment and a peak analysis of the Rrs spectra. For chlorophyll a, we have found a very good linear relationship (R2 =0.919) using the ratio between bands 9 and 7. Similar results are found using band 8 instead of 7. In any case, the model derived for the whole range of concentrations (0-500 mg m3 ) fails for low values (<15 mg m-3 ). Possible solutions include the use of - non-linear models or the use of two different models depending on the ratio values. For cyanobacteria detection, the ratio between bands 9 and 6 (the later centred at 620 nm) shows a good correlation (R2 =0.723) with phycocyanin concentration measured fluorometrically, and better (R2 =0.945) with zeaxanthin measured using HPLC. The correlation of other indicator pigments with MERIS band ratios is less strong, but is still possible to develop algorithms accurate enough for bloom monitoring. We also discuss the problems found with the L2 MERIS reflectance imagery that we have tried to use for model calibration. We present the results of the study carried on six reservoirs in northeastern Spain. In a date coincident with a MERIS image (June 19th, 2003) we have collected pigment concentration and reflectance data measured from a boat and 10 m resolution imagery for the 15 MERIS bands acquired with an airborne CASI-2 sensor. This three-level data has allowed us to calculate a new set of reflectance MERIS bands from the L1B imagery and compare them with the L2 imagery. The comparison could be useful for modifying the current atmospheric correction algorithms applied for L2 data generation, which we have observed that frequently fail in inland waters.
de Hoyos C.
Domínguez-Gómez J. A.
Peña-Martínez R.
Ruiz-Verdú A.
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