Performance of operational satellite bio-optical algorithms in different water types in southeastern Arabian Sea

• Autorzy: Minu P. , Lotliker A. A. , Shaju S. S. , Ashraf P. M. , Kumar T. S. , Meenakumari B.

Identyfikatory

DOI

10.1016/j.oceano.2016.05.005

• Języki publikacji: EN

Abstrakty

EN

The in situ remote sensing reflectance (R_rs) and optically active substances (OAS) measured using hyperspectral radiometer, were used for optical classification of coastal waters in the southeastern Arabian Sea. The spectral R_rs showed three distinct water types, that were associated with the variability in OAS such as chlorophyll-a (chl-a), chromophoric dissolved organic matter (CDOM) and volume scattering function at 650 nm (β₆₅₀). The water types were classified as Type-I, Type-II and Type-III respectively for the three R_rs spectra. The Type-I waters showed the peak R_rs in the blue band (470 nm), whereas in the case of Type-II and III waters the peak R_rs was at 560 and 570 nm respectively. The shifting of the peak R_rs at the longer wavelength was due to an increase in concentration of OAS. Further, we evaluated six bio-optical algorithms (OC3C, OC4O, OC4, OC4E, OC3M and OC4O2) used operationally to retrieve chl-a from Coastal Zone Colour Scanner (CZCS), Ocean Colour Temperature Scanner (OCTS), Sea-viewing Wide Field-of-view Sensor (SeaWiFS), MEdium Resolution Imaging Spectrometer (MERIS), Moderate Resolution Imaging Spectroradiometer (MODIS) and Ocean Colour Monitor (OCM2). For chl-a concentration greater than 1.0 mg m⁻³, algorithms based on the reference band ratios 488/510/520 nm to 547/550/555/560/565 nm have to be considered. The assessment of algorithms showed better performance of OC3M and OC4. All the algorithms exhibited better performance in Type-I waters. However, the performance was poor in Type-II and Type-III waters which could be attributed to the significant co-variance of chl-a with CDOM.

Słowa kluczowe

EN

remote sensing reflectance; algorithms; chlorophyll-a; CDOM; Arabian Sea; SATCORE

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2016
• Tom: No. 58 (4)
• Strony: 317--326
• Opis fizyczny: Bibliogr. 37 poz., tab., wykr., mapy

Twórcy

autor

Minu P.

• ICAR – Central Institute of Fisheries Technology, Kochi, India

autor

Lotliker A. A.

• Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, India

autor

Shaju S. S.

• ICAR – Central Institute of Fisheries Technology, Kochi, India

autor

Ashraf P. M.

• ICAR – Central Institute of Fisheries Technology, Kochi, India

autor

Kumar T. S.

• Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, India

autor

Meenakumari B.

• Indian Council for Agricultural Research, New Delhi, India

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.