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Title: Use of the first and second chlorophyll absorption bands for marine biogeochemical patch recognition
Authors: Szekielda, Karl Heinz
Keywords: Remote sensing;Biogeochemical provinces;Chlorophyll;Current systems;Image processing;MODIS
Issue Date: Dec-2005
Publisher: CSIR
Abstract: Water-leaving spectral signatures were used in the spectral regions where chlorophyll has its first and second absorption bands in order to recognize biogeochemical provinces in the pelagic and coastal ocean. The analysis of spectra collected in eutrophic coastal waters identified a very narrow spectral bandwidth in which the highest correlation between chlorophyll and the first derivative is apparent. A ratio technique using the defined envelope showed that a good relationship exists between the ratio of the reflectance R667/R678 and surface chlorophyll concentrations. The global data set for MODIS 3 used in this study data has a 4.89-km pixel resolution that is mapped on a cylindrical equidistant map projection. The data presented are based on an interpretation of the ratios R443/R551 and R678/R667 that use the spectral region of the two absorption bands of chlorophyll, the fluorescence of chlorophyll at 678 nm und the hinge point at 551 nm. The two selected ratios indicate the response of provinces according to the depth location of absorbing pigments as well as the overall response to integrated concentrations of pigments in the euphotic zone. The results show that biogeochemical provinces can be identified by the ratio technique and upwelling regions, current systems and river discharge can be spectrally separated.
Page(s): 387-395
ISSN: 0379-5136
Appears in Collections: IJMS Vol.34(4) [December 2005]

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