The Evolution of Optical Water Mass Classification

Arnone, Robert; Wood, Michelle L.; Gould, Richard

doi:10.5670/oceanog.2004.42

Cited by 37 publications

(26 citation statements)

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“…In October 2005, the same trendline was less robust (r=0.6188) and non-linear. The optical characterization of coastal water masses is important for interpreting and optimizing ocean color algorithms (ARNONE et al, 2004;AURIN et al, 2010). Indeed, operational empirical ocean color algorithms were designed only for Case 1 waters and are not expected to work well outside this domain.…”

Section: Bio-optical Water Types and Chl Algorithmmentioning

confidence: 99%

“…A number of studies have applied multivariate approaches for the optical water mass classification, in order to contribute to the understanding of biological and chemical processes (e.g. ARNONE et al, 2004). Although a number of semi-analytical models is available (see discussion in , the simpler approach of optical water type classification can optimize ocean color algorithm performances (AURIN et al, 2010), expanding and facilitating the applicability of remote sensing data.…”

Section: Introductionmentioning

confidence: 99%

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Bio-Optical Properties of the Inner Continental Shelf off Santos Estuarine System, Southeastern Brazil, and their Implications for Ocean Color Algorithm Performance

et al. 2014

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Optical characterizations of coastal water masses are important tools for a better understanding of physical and biochemical processes and aid the optimization of ocean color algorithms. In this study we present three optical classes of water observed during October/2005 and March/2006 on the inner continental shelf adjacent to Santos Bay (Brazil), based on remote sensing reflectance. ANOVA indicated a crescent estuarine influence in classes 1 to 3. Class 3 presented the highest chlorophyll-a and nutrient concentration and highest light absorption coefficients. Colored dissolved organic matter (CDOM) dominated the light absorption in all classes and was strongly correlated to salinity in October/2005 due to the influence of the La Plata plume. The results indicated that CDOM dynamics in the Santos inner shelf are very complex. The performance of global chlorophyll algorithms was significantly smaller for October/2005 than for March/2006. As inconsistent changes in light absorption spectra by phytoplankton were detected between samplings, the results show that future bio-optical algorithms for this region must be optimized preferentially considering CDOM optical parameters.

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Section: Bio-optical Water Types and Chl Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bio-Optical Properties of the Inner Continental Shelf off Santos Estuarine System, Southeastern Brazil, and their Implications for Ocean Color Algorithm Performance

et al. 2014

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“…The absorption coefficient by colored detrital matter, adg, provides information about detrital matter, which is mainly driven by colored dissolved organic matter in offshore waters. These three coefficients can be used to classify surface water masses [20], water composition assessment [21][22][23][24][25], oceanic primary production [16,26] and, in consequence, timing of the seasonal biological cycle of fishes (i.e., [27,28]) and potential fishing zones (i.e., [29][30][31]). Further, the derived products of ocean color imagery are a valuable source of data for ecosystem modeling, which provide forecasts of the development of plankton blooms, being useful warnings of harmful algal blooms and eutrophication risk (i.e., [31,32]).…”

Section: Introductionmentioning

confidence: 99%

Seasonal and Inter-Annual Analysis of Chlorophyll-a and Inherent Optical Properties from Satellite Observations in the Inner and Mid-Shelves of the South of Buenos Aires Province (Argentina)

et al. 2015

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Abstract:The aim of this study is to describe and understand the seasonal and inter-annual physical and biological dynamics of the inner and mid shelves of the Southwestern Buenos Aires Province (Argentina). We used chlorophyll-a (chl-a) concentrations and inherent optical properties (IOPs), derived from ocean color products between 2002 and 2010, as a proxy for the physical and biological parameters of interest. This study focuses on the absorption by phytoplankton, aph(443), particulate backscattering, bbp(443), and absorption due to dissolved and particulate detrital matter, adg (443), and chl-a derived from a multiband quasi-analytical algorithm (QAA). A regionalization based on the coefficient of variation and the Census X-11 method were applied to define regions and to analyze the inter-annual and seasonal variability of the ocean color parameters, with regards to climate OPEN ACCESSRemote Sens. 2015, 7 11822 variability. The coastal zone presents the highest values of chl-a with two maxima in winter and autumn, while the mid-shelf shows a strong spring chl-a maximum. After 2009, all parameters under study shifted their seasonality and their magnitude changed over the entire area. In the coastal zone, mean values of aph(443) and bbp(443) increased, while in the mid-shelf, chl-a and aph(443) decreased. The observed inter-annual and seasonal behavior of the parameters is tightly related to climate variability of the study area.

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“…Water color has long been used to define water masses since the introduction of the Forel-Ule color scale in the late 1800s (Hutchinson 1975;Arnone et al 2004). Color No.…”

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confidence: 99%

Red and black tides: Quantitative analysis of water‐leaving radiance and perceived color for phytoplankton, colored dissolved organic matter, and suspended sediments

Dierssen

Kudela

Ryan

et al. 2006

Limnology & Oceanography

138

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Using field measurements and quantitative modeling, we demonstrate that red coloration of the sea surface is not associated with any particular group of phytoplankton and is strongly dependent on the physiology of the human visual system. Red or brown surface waters can be produced by high concentrations of most types of algae, colored dissolved organic matter, or suspended sediment. Even though light reflected by red tides commonly peaks in the yellow spectral region (570-580 nm), human color perception requires consideration of the entire spectrum of light relative to receptors within the human eye. The color shift from green to red is not due to any special optical properties of the algae but results from an overlap in spectral response of the eye's red and green cones (centered at 564 and 534 nm, respectively). The spectral peak in light reflected from dense algal blooms coincides with a critical hinge point in color vision (570-580 nm), where fine-scale shifts in the spectral shape of water-leaving radiance due to algal absorption and backscattering properties lead to pronounced variations in the observed color. Of the taxa considered, only Chlorophytes and Prochlorophytes lacked sufficient accessory pigments to produce a red tide. Chlorophyll fluorescence and enhanced near-infrared reflectance (the ''red edge'') contribute negligibly to the perceived color. Black water events are produced when water is highly absorbing but lacks backscattering constituents.

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The Evolution of Optical Water Mass Classification

Cited by 37 publications

References 1 publication

Bio-Optical Properties of the Inner Continental Shelf off Santos Estuarine System, Southeastern Brazil, and their Implications for Ocean Color Algorithm Performance

Bio-Optical Properties of the Inner Continental Shelf off Santos Estuarine System, Southeastern Brazil, and their Implications for Ocean Color Algorithm Performance

Seasonal and Inter-Annual Analysis of Chlorophyll-a and Inherent Optical Properties from Satellite Observations in the Inner and Mid-Shelves of the South of Buenos Aires Province (Argentina)

Red and black tides: Quantitative analysis of water‐leaving radiance and perceived color for phytoplankton, colored dissolved organic matter, and suspended sediments

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