Effects Of Water Reflectance At 670 Nm On Coastal Zone Color Scanner (CZCS) Aerosol Radiance Estimates Off The Coast Of Central California

Mueller, James L.

doi:10.1117/12.943303

Cited by 5 publications

(7 citation statements)

References 13 publications

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“…1). Mueller (1984) reported a better agreement between CZCS and in situ 1 /K490 along track A (Fig. 1) in October 1982, using a CZCS sensitivity degradation model which was weighted heavily by data from October-November 1979-l 982 (Mueller 1985).…”

Section: Resultsmentioning

confidence: 99%

“…The Mueller (1985) model was used to reduce the CZCS calibration sensitivity over time. CZCS observations of open-water areas viewed immediately after viewing clouds may be contaminated by electronic overshoot and were eliminated from each scanline (Mueller 1988). K490 was calculated at each valid open-water pixel with the algorithm of Austin and Petzold ( 198 1).…”

Section: Data and Methods Of Analysismentioning

confidence: 99%

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Bio‐optical provinces of the Northeast Pacific Ocean: A provisional analysis.

Mueller

Lange

1989

Limnology & Oceanography

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A provisional analysis of satellite ocean color imagery and in situ profiles of spectral irradiance and Chl a fluorescence partitions the Northeast Pacific Ocean into four geographically and biooptically distinct provinces: the California Current system, the Alaskan gyre, the east central North Pacific central gyre, and the subarctic front. Within each province in a given 2-month period (JuneJuly 1985 and October-November 1982), a family of regression equations was found to accurately predict the vertical profiles of irradiance attenuation and normalized Chl a fluorescence from K490-the surface diffuse attenuation coefficient which can be estimated from remotely sensed ocean color. The irradiance attenuation profile (to the depth where irradiance is 0.1% of the surface value) is predicted directly from the reciprocal of K490. Prediction of the Chl a fluorescence profile is based on a log-linear photoadaptive profile of fluorescence over diffuse optical depth-a conceptual model which robustly fit the entire sample analyzed. Given K490, the profile is determined from four regression models predicting the depth in meters of the fluorescence maximum, the optical depth of the deep background fluorescence minimum, the surface intercept of the profile, and the slope of the profile between the surface and maximum.Remotely sensed ocean color can be used to determine phytoplankton pigment concentrations and optical diffuse attenuation coefficient K(490) (units given in list of symbols) in the near-surface layer of the ocean. A concern is that remotely sensed bio-optical properties represent only a shallow surface layer of the sea, while maxima in vertical profiles of Chl a concentrations (and Chl a fluorescence) are typically 2-3 times decpcr, and values at the maxima may greatly exceed those near the surface. Because of this profile shape, past work found pigment biomass at the surface to be poorly correlated with that integrated through the euphotic zone in oligotrophic waters of the Acknowledgments WC thank C. Trees, R. Zaneveld, and an anonymous reviewer for comments and suggestions which improved the manuscript. We also thank R. Smith and K. Baker for allowing us to use unpublished data from the Acania 1982 ODEX expedition, H.

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Section: Resultsmentioning

confidence: 99%

Section: Data and Methods Of Analysismentioning

confidence: 99%

Bio‐optical provinces of the Northeast Pacific Ocean: A provisional analysis.

Mueller

Lange

1989

Limnology & Oceanography

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“…If the usual CZCS atmospheric correction algorithm (1) is applied in these coastal waters, Lw(670) is treated erroneously as aerosol radiance and too large a correction is subtracted from measured radiance at 443, 520, and 550 nm. This over-correction and the use of iterative algorithms to compensate for the resulting error is reported elsewhere (8,9,10,11) and will not be addressed here. In waters where bottom reflectance can influence water leaving radiance at wavelengths between 400 and 600 nm, volume backscattering is low enough that Lw(67O) 0 and anomalously high water leaving radiances at 443, 520 and 550 provide a simple threshold criteria for identifying the presence of bottom reflected radiance.…”

Section: Czcs Data Processingmentioning

confidence: 95%

Bottom-reflectance discrimination using water-leaving radiance from coastal zone color scanner

Arnone¹,

Oriol

Trees

et al. 1990

SPIE Proceedings

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A method of discriminating radiance due to bright bottom reflectance from water volume reflectance has been developed for evaluating Coastal Zone Color Scanner products of chlorophyll concentrations and diffuse attenuation coefficients. A simple three-band thresholding algorithm is applied to CZCS water leaving radiance at 443, 520 and 550 nanometers. Thirty CZCS images were processed to characterize normalized water leaving radiances in three-channels.Statistics were obtained from reflectance signatures in areas of known bottom reflectance and areas of high volume scattering (significant sediment concentrations and low chlorophyll concentrations) . High bottom reflectance areas located in clear shallow waters (optically shallow) of Bahamian and Florida Keys were found to have higher water leaving radiance in all three channels than areas of exclusively high volume scattering (optically deep) , e . g . Mississippi Delta , Chesapeake Bay, and Sargasso Sea. Radiances exceeding thresholds in any of the three spectral channels are assumed to be corrupted by bottom reflectance and derived bio-optical products assumed invalid. Comparisons of bottom corrupted pixels are in close agreement with charted bathymetry and in-situ ship radiance data.

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“…Other authors, notably Clark (1981), Austin and Petzold (1981), Gordon and Morel (1983) and Mueller (1984) have derived the relationships between the upwelled radiance from the sea surface and both the near-surface chlorophyll and the near-surface values of £(>,). Thus a relationship exists between the near-surface values of K and of chlorophyll «Chl a> < 1.5 mg Chl a/m ) given by,…”

Section: The Integrated Gross Primary Productionmentioning

confidence: 98%