Influence of dissolved organic materials on turbid water optical properties and remote‐sensing reflectance

Witte, W. G.; Whitlock, C. H.; Harriss, Robert C.; Usry, J. W.; Poole, L. R.; Houghton, W. M.; Morris, W. D.; Gurganus, E. A.

doi:10.1029/jc087ic01p00441

Cited by 48 publications

(12 citation statements)

References 9 publications

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“…CDOM absorbance at these wavelengths is low, and its influence on reflectance should be negligible in this region compared to that of algae and detritus. Other researchers also reported good performance for equations predicting DOC or CDOM using wavelengths > 570 nm (Vertucci and Likens 1989, Arenz et al 1996, Witte et al 1982. We are unable to explain why the ratio R 670 /R 571 performed so well, and other researchers also were troubled by these results.…”

Section: Discussioncontrasting

confidence: 40%

Influence of Chlorophyll and Colored Dissolved Organic Matter (CDOM) on Lake Reflectance Spectra: Implications for Measuring Lake Properties by Remote Sensing

Menken

Brezonik

Bauer

2006

Lake and Reservoir Management

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Menken, K., P. Brezonik and M. Bauer. 2006. Influence of chlorophyll and colored dissolved organic matter (CDOM) on lake reflectance spectra: Implications for measuring lake properties by remote sensing. Lake and Reserv. Manage. 22(3):179-190.Light reflected from lake surfaces can convey much information about water quality, especially algal abundance, humic content, turbidity and suspended solids. Light reflectance from lakes is complicated, and detailed spectra are needed for analysis of controlling factors. We obtained detailed reflectance spectra from the water surfaces of 15 lakes in east-central Minnesota and found patterns related to chlorophyll a (chl a), turbidity and humic matter (colored dissolved organic matter, CDOM). Increasing chl a and turbidity generally resulted in higher reflectance across the visible and near-infrared spectrum. Increasing CDOM led to low reflectance, especially below ~500 nm. Spectra of lakes with high chl a were distinguishable from those of lakes low in chl a, and lakes with low or high CDOM had readily distinguishable spectra. Several optical characteristics of lake water can be estimated from reflectance intensities measured over narrow wavelength bands. The ratio of reflectance at 700 nm to that at 670 nm was the best predictor of chl a over a wide range of conditions, including high turbidity and CDOM. Several relationships involving reflectance at 412, 443, 488, and 551 nm, the wavelengths used to calculate oceanic chl a from MODIS satellite data, also yielded a high R 2 . The ratio of reflectance at 670 nm to 571 nm provided the best estimates of humic color despite the low absorbance of CDOM at these wavelengths. Relationships involving reflectance for all 15 lakes in the range 400-500 nm, where CDOM absorbs light, had low r 2 values; none was high enough for reliable estimates of lake color. For 10 lakes with low to medium chl a levels (≤10 mg m -3 ), regressions involving 412 and 443 nm yielded moderately good relationships. Airborne and satellite remote sensing thus might be used to identify lakes high in CDOM, and may provide reasonable estimates of humic color in lakes with low chl a levels.

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Section: Discussioncontrasting

confidence: 40%

Influence of Chlorophyll and Colored Dissolved Organic Matter (CDOM) on Lake Reflectance Spectra: Implications for Measuring Lake Properties by Remote Sensing

Menken

Brezonik

Bauer

2006

Lake and Reservoir Management

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“…It is expected that the effect of particle size should be greater for black rather than for brown sediments for reflectance relating to suspended sediment concentration. Novo et al (1989a) and Witte et al (1982) suggested that the mineralogy and colour of sediments affect the relationship between suspended sediment concentration and reflectance. The mineral composition and specific gravity of the black and brown sediments are given in Table 2 which indicates that the clay and nonclay minerals are dominant in black and brown sediments respectively.…”

Section: Resultsmentioning

confidence: 99%

The effect of properties of sediment type on the relationship between suspended sediment concentration and radiance

Choubey

1994

Hydrological Sciences Journal

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Hydrological Sciences -Journal-des Sciences Hydrologiques,39,5, October 1994 459The effect of properties of sediment type on the relationship between suspended sediment concentration and radiance V. K. CHOUBEY National Institute of Hydrology, Jal Vigyan Bhavan, Roorkee 247667, IndiaAbstract A laboratory experiment was designed to determine the spectral characteristics of different types of sediment suspended in water in the visible and near infrared wavelengths (0.45-0.9 /xm) using a fourchannel radiometer. Field collected sediments were resuspended in water to produce different concentration levels for the measurement of radiance. Spectral measurements of turbid water showed a distinctive difference in the behaviour of radiance with change in the inorganic suspended sediment concentration and type. It was noted that the correlation between the suspended sediment concentration and the radiance varied with the mineral composition of the sediment. The clay minerals of low specific gravity had larger values of radiance than those from high specific gravity nonclay minerals. Based on the results obtained, it appears that an algorithm to estimate suspended sediment concentration can be developed from radiance.Les effets des propriétés de différents types de sédiments sur la relation entre concentration et radiance Résumé Une expérience de laboratoire a été menée afin de déterminer les caractéristiques spectrales dans le visible et le proche infrarouge (0.45-0.9 fim) de différents types de sédiments en suspension dans l'eau grâce à l'utilisation d'un radiomètre à quatre canaux. Les sédiments recueillis sur le terrain ont été remis en suspension selon différentes concentrations dont la radiance a été mesurée. Les mesures réalisées sur les eaux turbides ont montré un comportement significativement différent de la radiance selon la nature et la concentration des matières en suspension inorganiques. Il a pu être noté que la corrélation entre la concentration des matières en suspension et la radiance dépendait de la composition minéralogique du sédiment. Les minéraux argileux de faible masse spécifique présentent une radiance plus importante que les minéraux non-argileux de forte masse spécifique. A partir des résultats obtenus, il apparaît qu'il est possible de définir un algorithme permettant d'estimer la concentration des matières en suspension à partir de la radiance.

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“…Phillips and Kirk (1984) verified this assumption experimentally and gave arguments for expecting such behavior. Witte et al (1982) found minimal wavelength dependence for backscattering coefficients in systems in which scattering was dominated by inorganic solids. For some species of algae absorption and scattering are complementary, i.e.…”

Section: Photosyntheticallymentioning

confidence: 99%

Modeling spectral diffuse attenuation, absorption, and scattering coefficients in a turbid estuary

Gallegos

Correll

Pierce

1990

Limnology & Oceanography

151

104

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Spectral diffuse attenuation coefficients were measured in the Rhode River and Chesapeake Bay, Maryland, on 28 occasions in 1988 and 1989. The model of Kirk was used to extract scattering and absorption coefficients from the measurements in waters considerably more turbid than those in which the model was previously applied. Estimated scattering coefftcients were linearly related to mineral suspended solids. Estimates of total absorption coefficients were decomposed as the sum of contributions by water, dissolved organic matter, phytoplankton chlorophyll, and particulate detritus, each having a characteristic spectral shape. The 1988 data were used to develop a model of scattering and absorption coefficients based on the specific curves regressed against water-quality parameters. Diffise attenuation coefficients in the 1989 data ranging from 1 to 10 m-l and photic depths ranging from < 1 to 4.5 m were predicted with a C.V. of about 25%.The problem of estimating concentrations of water-quality constituents from optical measurements was indeterminate due to the similarity in shape of the specific curves of dissolved substances and depigmented particulates. Chlorophyll concentration could be estimated because it was strongly related to water-corrected absorption in the 670-nm waveband, but several outliers occurred due to biological variability in specific absorption of pigments.

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Influence of dissolved organic materials on turbid water optical properties and remote‐sensing reflectance

Cited by 48 publications

References 9 publications

Influence of Chlorophyll and Colored Dissolved Organic Matter (CDOM) on Lake Reflectance Spectra: Implications for Measuring Lake Properties by Remote Sensing

Influence of Chlorophyll and Colored Dissolved Organic Matter (CDOM) on Lake Reflectance Spectra: Implications for Measuring Lake Properties by Remote Sensing

The effect of properties of sediment type on the relationship between suspended sediment concentration and radiance

Modeling spectral diffuse attenuation, absorption, and scattering coefficients in a turbid estuary

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