Relationship between sub-surface diffused reflectance and inherent optical properties in coastal waters

Mishra, Anoop Kumar; Rao, D. P.

doi:10.1080/01431160110039226

Cited by 4 publications

(4 citation statements)

References 21 publications

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“…These IOPs play an important role in determining the underwater light climate, phytoplankton primary production, and remote sensing reflectance (Kirk, 1994), and are therefore key parameters in bio-optical algorithms for water quality assessment using remote sensing, radiative transfer models in a water column, and bio-optical models for estimation of primary production (Strö mbeck & Pierson, 2001;Mishra & Rao, 2002;Tilstone et al, 2005). The total absorption spectrum is used for estimating the contributions of the different components (non-phytoplankton particles and phytoplankton, CDOM and pure water) to the total absorption.…”

Section: Introductionmentioning

confidence: 99%

A study of absorption characteristics of chromophoric dissolved organic matter and particles in Lake Taihu, China

et al. 2007

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Absorptions by non-phytoplankton particles and phytoplankton, and chromophoric dissolved organic matter (CDOM) were measured at 50 sites in large, shallow, Lake Taihu in winter and summer 2006 to study their seasonal and spatial variations, and their relative contributions to total absorption. The CDOM absorption was significantly higher in winter than in summer, due to degradation and release of fixed carbon in phytoplankton and submerged aquatic vegetation (SAV). The hyperbolic model was used to model the spectral absorption of CDOM, and the mean spectral slope of 6.38 nm -1 was obtained. At most sites, the spectral absorption of non-phytoplankton particles was similar to that of the total particles, demonstrating that the absorption of the total particles is dominated by the absorption of non-phytoplankton particles. In summer, phytoplankton absorption increased markedly, due to frequent algal blooms especially in Meiliang Bay. In winter, the significant increase in non-phytoplankton particle absorption resulted from the increase of inorganic particulate matter caused by sediment resuspension. Strong linear relationships were found between a d (440) and total suspended matter (TSM), organic suspended matter (OSM), and inorganic suspended matter (ISM). Strong linear relationships were also found between a ph (440), a ph (675) and chlorophyll a (Chl-a) concentration. The total relative contributions of non-phytoplankton particles over the range of photosynthetically active radiation (PAR) (400-700 nm) were 48.4 and 79.9% in summer and winter respectively. Non-phytoplankton particle absorption dominated the total absorption, especially in winter, in Lake Taihu, due to frequent sediment resuspension in the large shallow lake as a result of strong windy conditions. The results indicate that strong

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Section: Introductionmentioning

confidence: 99%

A study of absorption characteristics of chromophoric dissolved organic matter and particles in Lake Taihu, China

et al. 2007

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“…The above relationship has been investigated for the coastal waters off Paradip, Bay of Bengal (Mishra and Rao, 2002). The relationship is found to be…”

Section: Development Of Ssc Retrieval Algorithmmentioning

confidence: 88%

“…Higher values of all the nutrients during ebb tide suggest that the freshwater influx can be vital source of nutrients for the estuary (Das et al, 1997). Attempts have been carried out to interpret the inherent optical properties in the coastal waters off Paradip (Mishra and Rao, 2002). Analysis of diffused reflectance with the ratio of backscattering to the absorption coefficient shows a linear relationship.…”

Section: The Study Areamentioning

confidence: 99%

Retrieval of suspended sediment concentration in the estuarine waters using IRS-1C WiFS data

Mishra

2004

International Journal of Applied Earth Observation and Geoinfor

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“…This is a preliminary investigation to infer the spectral responses of the water column observed during the cruise on board "Sagar Sampada" between 15-29 April, 2006 in the northeast Arabian Sea, along the Indian west coast. Earlier, survey and study have been carried out using LICOR and Satlantic underwater radiometers in the Indian waters (Sarangi et al, 2002;Pradhan et al, 2005;Mishra and Rao, 2002;Chauhan et al, 2002a, 2002band Menon et al, 2005. The current hyperspectral underwater radiometer procured from Hobilabs Inc., USA was operated for the fi rst time in the Arabian Sea and signifi cant observations have been refl ected.…”

Section: Introductionmentioning

confidence: 99%

Hyperspectral radiometric observation of the northeast Arabians Sea during April 2006

Sarangi

Singh

Dwidevi

et al. 2008

J Indian Soc Remote Sens

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Parameters were retrieved from the hyperspectral radiometer like upwelling and downwelling radiance (Lu and Ed) upwelling and downwelling attenuation (K-Lu and K-Ed) for 9 stations in the northeast Arabian Sea between 16-26 April 2006. Data was analyzed for 5 offshore and 4 coastal stations of the cruise SS-244, on board FORV "Sagar Sampada" between latitude 9-22 o N and longitude 68-74 o E. The peak for all parameters was observed to be different respectively for depths 1, 5, 10, 20, 30, 40, 50 meters in coastal and offshore stations. Each peak in the respective wavelength is due to a particular composition; phytoplankton pigments have spectral peaks at 443, 490, 555, 670 nm, suspended matter, sediments have peaks at 630 and 670 nm. Detailed analysis with High Performance Liquid Chromatography (HPLC) data and comparison with the water composition of our hyperspectral radiometer results show that the marine cyanophyte, Trichodesmium bloom produces high pigment concentrations of chlorophyll-a, zeaxanthin, β-carotene and pheophytin and their absorptions are interpreted at wavelengths 443, 490, 515 and 536 nanometers, respectively. A dip around 515 nm was seen in the Ed and Lu profi les in our study.

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Relationship between sub-surface diffused reflectance and inherent optical properties in coastal waters

Cited by 4 publications

References 21 publications

A study of absorption characteristics of chromophoric dissolved organic matter and particles in Lake Taihu, China

A study of absorption characteristics of chromophoric dissolved organic matter and particles in Lake Taihu, China

Retrieval of suspended sediment concentration in the estuarine waters using IRS-1C WiFS data

Hyperspectral radiometric observation of the northeast Arabians Sea during April 2006

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