22 December 2006 Assessment of apparent and inherent optical properties in the northeastern Arabian Sea using in situ hyperspectral remote sensing
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Abstract
In-situ measurements of the bio-optical properties of the seawater are important to develop algorithms for seawater constituent estimation using satellite remote sensing. A data collection campaign was conducted for bio-optical characterization of the open and coastal waters of the Arabian Sea during April 15-29, 2006. Bio-optical measurements were made using the Satlantic hyper-spectral underwater radiometer (Hyperpro-II) for 13 sampling stations include oligotrophic, Trichodesmium bloom dominated and coastal waters in 400-800 nm spectral range. For open oceans stations 1% light was available at 50 to 70 meter depth, whereas, for coastal waters it varied from 18 to 35 meter. The deep chlorophyll maxima (DCM) was observed at 30 to 42 meter depth during the bloom conditions with surface chlorophyll-a concentration ranging between 0.1 to 0.85 mg m-3 whereas, for open ocean and non-bloom conditions the DCM depth varied from 35 to 60 m with surface chlorophyll ranging between 0.05 to 0.12 mgm-3. Particulate back scattering coefficient at 700-nm vary from 0.0011 to 0.0031 for bloom waters and 0.00046 to 0.0012 for open ocean waters. The normalized water leaving radiance computed from these spectra in the spectral bands of IRS-P4, OCM bands were examined. The global ocean chlorophyll-2 (OC2), and 4 (OC4) algorithms performed reasonably well for open ocean waters, however both the algorithms overestimated chlorophyll concentration for bloom dominated waters.
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P. V. Nagamani, Mini Raman, Prakash Chauhan, R. M. Dwivedi, "Assessment of apparent and inherent optical properties in the northeastern Arabian Sea using in situ hyperspectral remote sensing", Proc. SPIE 6405, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications, 64051W (22 December 2006); doi: 10.1117/12.693573; https://doi.org/10.1117/12.693573
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