Particulate backscattering ratio at LEO 15 and its use to study particle composition and distribution

Boss, Emmanuel; Pegau, W. Scott; Lee, M.; Twardowski, Michael; Shybanov, E. B.; Коротаев, Г. К.; Baratange, F.

doi:10.1029/2002jc001514

Cited by 224 publications

(239 citation statements)

References 36 publications

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“…This type of spectral shape is determined by the particle composition and concentration. Especially small lithogenic particles can increase the scattering coefficients (Whitmire et al, 2007) and the backscattering ratio (Boss et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

Contribution to a bio-optical model for remote sensing of Lena River water

et al. 2013

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Abstract. Bio-optical measurements and sampling were carried out in the delta of the Lena River (northern Siberia, Russia) between 26 June and 4 July 2011. The aim of this study was to determine the inherent optical properties of the Lena water, i.e., absorption, attenuation, and scattering coefficients, during the period of maximum runoff. This aimed to contribute to the development of a biooptical model for use as the basis for optical remote sensing of coastal water of the Arctic. In this context the absorption by CDOM (colored dissolved organic matter) and particles, and the concentrations of total suspended matter, phytoplankton-pigments, and carbon were measured. CDOM was found to be the most dominant parameter affecting the optical properties of the river, with an absorption coefficient of 4.5-5 m −1 at 442 nm, which was almost four times higher than total particle absorption values at visible wavelength range. The wavelenght-dependence of absorption of the different water constituents was chracterized by determining the semi logarithmic spectral slope. Mean CDOM, and detritus slopes were 0.0149 nm −1 (standard deviation (stdev) = 0.0003, n = 18), and 0.0057 nm −1 (stdev = 0.0017, n = 19), respectively, values which are typical for water bodies with high concentrations of dissolved and particulate carbon. Mean chlorophyll a and total suspended matter were 1.8 mg m −3 (stdev = 0.734 n = 18) and 31.9 g m −3 (stdev = 19.94, n = 27), respectively. DOC (dissolved organic carbon) was in the range 8-10 g m −3 and the total particulate carbon (PC) in the range 0.25-1.5 g m −3 . The light penetration depth (Secchi disc depth) was in the range 30-90 cm and was highly correlated with the suspended matter concentration. The period of maximum river runoff in June was chosen to obtain bio-optical data when maximum water constituents are transported into the Laptev Sea. However, we are aware that more data from other seasons and other years need to be collected to establish a general bio-optical model of the Lena water and conclusively characterize the light climate with respect to primary production.

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Section: Discussionmentioning

confidence: 99%

Contribution to a bio-optical model for remote sensing of Lena River water

et al. 2013

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“…In contrast, open ocean water field measurements of the particulate backscattering coefficient, b bp (66w), are relatively scarce and restricted to few oceanic areas given that the proper in situ commercial instrumentation has been made available only for about a decade Reynolds et al, 2001;Boss et al, 2004;Huot et al, 2008). The first order variability of both c p (66w) and b bp (66w) can be used to assess the concentration of the particulate assemblage.…”

Section: The Bio-optical Environment Of the Particulate Matter At Thementioning

confidence: 99%

Characterization of the bio-optical anomaly and diurnal variability of particulate matter, as seen from scattering and backscattering coefficients, in ultra-oligotrophic eddies of the Mediterranean Sea

et al. 2011

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Abstract. The variability of inherent optical properties is investigated in the ultra-oligotrophic waters of the Mediterranean Sea sampled during the BOUM experiment performed during early summer 2008. Bio-optical relationships found for ultra-oligotrophic waters of the three anticyclonic gyres sampled significantly depart from the mean standard relationships provided for the global ocean, confirming the peculiar character of these Mediterranean waters. These optical anomalies are diversely related to the specific biological and environmental conditions occurring in the studied ecosystem. Specifically, the surface specific phytoplankton absorption coefficient exhibits values lower than those expected from the general relationships mainly in relation with a high contribution of relatively large sized phytoplankton. Conversely, the particulate backscattering coefficient, b bp , values are much higher than the mean standard values for a given chlorophyll-a concentration, TChl-a. This feature can presumably be related to the relevant influence of highly refractive submicrometer particles of Saharan origin in the surface layer of the water column. The present measurements Correspondence to: H. Loisel (hubert.loisel@univ-littoral.fr) also show that the Mediterranean Sea is greener than TChla alone indicates, as already stressed in previous studies. This color anomaly is partly explained by the estimated colored dissolved organic matter and submicrometer particles absorption coefficients, and to a greater extent by the high b bp /TChl-a values assuming that these particles backscatter light similarly in the green and blue parts of the visible spectrum. The diel variation of both the particulate matter attenuation and backscattering coefficients were also investigated specifically. Despite some differences in the timing and the magnitude of the daily oscillations found for these optical parameters, potential for the backscattering coefficient daily oscillation to be used, similarly to that for the attenuation coefficient, as a proxy for estimating carbon community production budget has been highlighted for the first time. This result is particularly relevant for present and future geostationary spatial ocean color missions.

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“…The generally narrow range of variation in S det and the lack of dependence on the variables considered discourage the use of this parameter for monitoring purposes. Scattering and backscattering coefficients and backscattering ratios may be more applicable (Twardowski et al, 2001;Boss et al, 2004).…”

Section: Time Variability Of Optical Parametersmentioning

confidence: 99%