Spectral indexation of pixels of MODIS sea surface images for detecting inconstancy of phytopigment composition in water

• Autorzy: Karabashev Genrik S.

Identyfikatory

DOI

10.1016/j.oceano.2021.06.001

• Języki publikacji: EN

Abstrakty

EN

This paper presents the first results of a new way of using MODIS (Moderate Resolution Imaging Spectroradiometer) sensor data to visualize phytopigment inconstancy in the near-surface layer of water basins. Other sensors of this class alike, the MODIS spectral resolution is too low to reproduce the minimums of reflectance R_rs caused by phytopigments in water. However, MODIS is remarkable for the presence of a channel at 469 nm combined with channels at 412, 443, 488, 531, 547, and 555 nm. This makes it possible to distinguish the spectral limits of preferential light absorption by chlorophyll a (412-469 nm) and by accessory pigments (469-555 nm). These capabilities were realized thanks to spectral pixel indexation (SPI) of MODIS images of the sea surface. The SPI boils down to the fact that a user determines the presence of pigment minima in spectra of every image pixel, finds the sum of the wavelengths of these minima as a WRM code and assigns it to the image pixel as one of its attributes. WRM code = 100 is assigned to pixels free of the minima. Such indexation makes it possible to examine the inconstancy of phytopigments on the background of aquatic environment variability. Application of SPI approach to MODIS images of the Gulf of Mexico and the Baltic Sea made it possible to reveal new patterns of phytopigment dynamics during HABs events.

Słowa kluczowe

EN

MODIS; Moderate Resolution Imaging Spectroradiometer; Baltic Sea; Gulf of Mexico; spectral indexation; HABs; Phytopigments

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2021
• Tom: No. 63 (4)
• Strony: 482--496
• Opis fizyczny: Bibliogr. 29 poz., rys., tab., wykr.

Twórcy

autor

Karabashev Genrik S.

• Laboratory of ocean optics, Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia

Bibliografia

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