Simulation of water colors in a shallow acidified lake, Lake Onneto, Japan, using colorimetric analysis and bio-optical modeling

Oyama, Yoichi; Shibahara, Akihiko

doi:10.1007/s10201-009-0260-1

Cited by 13 publications

(10 citation statements)

References 24 publications

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“…Onda et al . [26] who investigated the cloudy emerald-green hue of Yugama Crater Lake on Mount Shirane, Japan, reported that the water color is due to an optical interaction involving Rayleigh and Mie scattering by colloidal sulfur particles, causing blue and cloudy white colors, respectively, and absorption by dissolved iron (II) ions cause a green color [9], [26].…”

Section: Resultsmentioning

confidence: 99%

Scattering of Light by Colloidal Aluminosilicate Particles Produces the Unusual Sky-Blue Color of Río Celeste (Tenorio Volcano Complex, Costa Rica)

et al. 2013

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Río Celeste (Sky-Blue River) in Tenorio National Park (Costa Rica), a river that derives from the confluence and mixing of two colorless streams—Río Buenavista (Buenavista River) and Quebrada Agria (Sour Creek)—is renowned in Costa Rica because it presents an atypical intense sky-blue color. Although various explanations have been proposed for this unusual hue of Río Celeste, no exhaustive tests have been undertaken; the reasons hence remain unclear. To understand this color phenomenon, we examined the physico-chemical properties of Río Celeste and of the two streams from which it is derived. Chemical analysis of those streams with ion-exchange chromatography (IC) and inductively coupled plasma atomic emission spectroscopy (ICP-OES) made us discard the hypothesis that the origin of the hue is due to colored chemical species. Our tests revealed that the origin of this coloration phenomenon is physical, due to suspended aluminosilicate particles (with diameters distributed around 566 nm according to a lognormal distribution) that produce Mie scattering. The color originates after mixing of two colorless streams because of the enlargement (by aggregation) of suspended aluminosilicate particles in the Río Buenavista stream due to a decrease of pH on mixing with the acidic Quebrada Agria. We postulate a chemical mechanism for this process, supported by experimental evidence of dynamic light scattering (DLS), zeta potential measurements, X-ray diffraction and scanning electron microscopy (SEM) with energy-dispersive spectra (EDS). Theoretical modeling of the Mie scattering yielded a strong coincidence between the observed color and the simulated one.

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Section: Resultsmentioning

confidence: 99%

Scattering of Light by Colloidal Aluminosilicate Particles Produces the Unusual Sky-Blue Color of Río Celeste (Tenorio Volcano Complex, Costa Rica)

et al. 2013

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“…Similarly, the b * axis describes the blue (negative values) to yellow (positive values) transition [ Schanda , 2007]. We adopted this color coordinate system because it had an advantage over other indices, such as the CIE xyY color space [see Duntley , 1963; Oyama and Shibahara , 2009; Tyler , 1964], in that it includes a component for lightness. This greatly differentiated the waterbodies of the present study.…”

Section: Methodsmentioning

confidence: 99%

“…For natural waterbodies, measurements of their above‐water apparent optical properties (AOP) can be converted into colorimetric coordinate values, which may provide a quantitative means to test the relationship between color and specific limnological variables. This approach offers a potentially useful tool for resource management (e.g., for assessments of aesthetic value and water quality); however, it has been applied to only a limited extent to date [ Duntley , 1963; Oyama and Shibahara , 2009; Tyler , 1964].…”

Section: Introductionmentioning

confidence: 99%

Optical diversity of thaw ponds in discontinuous permafrost: A model system for water color analysis

Watanabe¹,

Laurion²,

Chokmani³

et al. 2011

J. Geophys. Res.

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Permafrost thaw ponds result from the irregular melting and erosion of frozen soils, and they are active sites of greenhouse gas emissions to the atmosphere throughout the circumpolar North. In the discontinuous permafrost region of Nunavik, Canada, thaw ponds show pronounced differences in color even among nearby ponds, ranging from white to green, brown and black. To quantify this optical variation and to determine its underlying controlling mechanisms, we studied the apparent and inherent optical properties and limnological characteristics of the ponds. The pond colors were well separated on a color coordinate diagram, with axis values determined from above‐water spectral reflectance measurements. Our analyses of optical properties and their empirical relationships with optically active substances showed that the differences in color could entirely be attributed to variations in the concentration of two optically active substances: dissolved organic carbon, which was a major contributor to spectral absorption, and nonalgal suspended particulate matter, which contributed to spectral scattering as well as absorption. The latter component was dominated by small sized particles that had unusually high mass‐specific absorption and scattering properties. Analysis of high spatial resolution, multispectral satellite imagery of these ponds showed that these two optically important constituents could be estimated by multivariate modeling. The results indicate that remote sensing surveys will provide valuable synoptic observations of permafrost thaw ponds across the vast subarctic region, and may allow scaling up of local greenhouse gas flux measurements to regional and circumpolar scales.

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“…The blue water index and other color space values in our study were obtained from radiometric observations with high spectral resolution. Radiometric analysis has been used to quantify the apparent color of other natural waters (Bukata et al ; Bukata et al ; Oyama and Shibahara ; Watanabe et al ), and has multiple advantages over traditional visual matching of color samples. First, it avoids any observational error derived from ambient conditions and perceptional differences among observers (Davies‐Colley et al ).…”

Section: Discussionmentioning

confidence: 99%

“…The geometry of radiometric measurements for color evaluation of natural water bodies varies among studies (Bukata et al 1997(Bukata et al , 2001Davies-Colley et al 1997;Oyama and Shibahara 2009;Watanabe et al 2011), and these differences in methodology will need to be considered when making comparisons. A standardized method with the possibility of broader application is therefore to be preferred.…”

Section: Discussionmentioning

confidence: 99%

A quantitative blueness index for oligotrophic waters: Application to Lake Tahoe, California–Nevada

Watanabe

Vincent

Reuter

et al. 2015

Limnology & Ocean Methods

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The perceived blue color of a lake often contributes to its aesthetic appeal, and changes in blueness can be indicative of major shifts in water quality. We developed a quantitative blue water index (Bw) for natural waters, and used it to evaluate spatial and seasonal variations in ultraoligotrophic Lake Tahoe, where clarity and blueness are of ecological and economic value and a focus for lake management strategies. Spectral reflectance was measured using a profiling hyperspectral radiometer, and the values were converted to the axis values of a color space: the International Commission on Illumination L*a*b*, where L* is the lightness of color, a* ranges from green to magenta, and b* ranges from blue to yellow. The blue water index Bw, defined as negative b*, was similarly high at two offshore monitoring sites in Lake Tahoe, but much lower in a semienclosed bay and a small adjacent lake. Seasonal variations of Bw were determined using a hyperspectral radiometer attached to a buoy in the middle of Lake Tahoe. The Bw values were highest in summer, and there was a strong inverse correlation between Bw and phytoplankton concentrations as measured by in vivo chlorophyll a fluorescence. However, there was no significant correlation between Bw and Secchi depth. Blueness and visual clarity are complementary measures of the perceived optical state of natural waters, and for many lakes may provide a powerful combination of indicators for conveying water quality to the public.

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Simulation of water colors in a shallow acidified lake, Lake Onneto, Japan, using colorimetric analysis and bio-optical modeling

Cited by 13 publications

References 24 publications

Scattering of Light by Colloidal Aluminosilicate Particles Produces the Unusual Sky-Blue Color of Río Celeste (Tenorio Volcano Complex, Costa Rica)

Scattering of Light by Colloidal Aluminosilicate Particles Produces the Unusual Sky-Blue Color of Río Celeste (Tenorio Volcano Complex, Costa Rica)

Optical diversity of thaw ponds in discontinuous permafrost: A model system for water color analysis

A quantitative blueness index for oligotrophic waters: Application to Lake Tahoe, California–Nevada

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