Light absorption and fluorescence properties of chromophoric dissolved organic matter (CDOM), in the St. Lawrence Estuary (Case 2 waters)

Nieke, Barbara; Reuter, R.; Heuermann, R.; Wang, H.; Babin, Marcel; Therriault, J.-C.

doi:10.1016/s0278-4343(96)00034-9

Cited by 132 publications

(60 citation statements)

References 30 publications

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“…The relationships between absorption coefficients and normalized fluorescence, putting together the data of all the samples analysed, are reported in Figure 4a. The slope of the a 355 vs F n(355) (0.184) is quite comparable with those reported in the literature (Hoge et al, 1993;Nieke et al, 1997) although on the average weakly lower. When the plot is limited only to the coastal samples, a different slope is found (Figure 4b).…”

Section: Fluorescence Propertiessupporting

confidence: 89%

DOC, absorption and fluorescence properties of estuarine and coastal waters of the Northern Tyrrhenian Sea

Seritti¹,

Russo²,

Nannicini³

et al. 1998

Chemical Speciation & Bioavailability

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Section: Fluorescence Propertiessupporting

confidence: 89%

DOC, absorption and fluorescence properties of estuarine and coastal waters of the Northern Tyrrhenian Sea

Seritti¹,

Russo²,

Nannicini³

et al. 1998

Chemical Speciation & Bioavailability

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“…NAP and CDOM dominate the diffuse light attenuation of SLE waters (Nieke et al, 1997). This is partially related to the inflow of CDOM-rich and NAP-rich waters coming from the St. Lawrence River and Saguenay Fjord (Tremblay and Gagné, 2007;Xie et al, 2012).…”

Section: Study Areamentioning

confidence: 99%

“…Babin et al (1993) investigated the horizontal variability of the specific absorption coefficient of phytoplankton (i.e., absorption coefficient normalized by concentration of chlorophyll + phaeopigments) in surface waters during the summer of 1989and 1990. Nieke et al (1997 reported high values (up to 3 m −1 ) of particulate beam attenuation coefficients (c SPM ) and inverse relationships between salinity, c SPM , and CDOM absorption coefficients (a CDOM ) based on measurements done during summer of 1990.…”

Section: Study Areamentioning

confidence: 99%

“…Despite this, only the interval 3-170 µm was analyzed due to stray-light effects and variability of particle shape and refractive index in the first bins (i.e., < 3.2 µm) (Agrawal et al, 2008;Andrews et al, 2010;Reynolds et al, 2010) and bias related to particle sinking in the last bins (i.e., 170-250 µm) . The Hampel filter algorithm was applied to the original measurements in order to eliminate outliers (Pearson, 2005). Lastly, each final PSD estimate was computed as the average of measurements made during 3 min at a 1 Hz sampling rate.…”

Section: Optical Measurementsmentioning

confidence: 99%

“…The Saint Lawrence Estuary (SLE) and the Saguenay Fjord (SF) constitute a large subarctic system characterized by relatively high concentrations of chromophoric dissolved organic matter (CDOM) (Nieke et al, 1997). The remote sensing of physical attributes of SPM (e.g., PSD) in these waters is crucial for studying regional climate effects on coastal erosion and occurrence of harmful algae blooms.…”

Section: Introductionmentioning

confidence: 99%

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Optical properties of size fractions of suspended particulate matter in littoral waters of Québec

Mohammadpour

Gagné

Larouche³

et al. 2017

Biogeosciences

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Abstract. Mass-specific absorption (a i * (λ)) and scattering (b i * (λ)) coefficients were derived for four size fractions (i = 0.2-0.4, 0.4-0.7, 0.7-10, and > 10 µm, λ = wavelength in nm) of suspended particulate matter (SPM) and with samples obtained from surface waters (i.e., 0-2 m depth) of the Saint Lawrence Estuary and Saguenay Fjord (SLE-SF) during June of 2013. For the visible-near-infrared spectral range (i.e., λ = 400-710 nm), mass-specific absorption coefficients of total SPM (i.e., particulates > 0.2 µm) (hereafter a SPM * ) had low values (e.g., < 0.01 m 2 g −1 at λ = 440 nm) in areas of the lower estuary dominated by particle assemblages with relatively large mean grain size and high particulate organic carbon and chlorophyll a per unit of mass of SPM. Conversely, largest a SPM * values (i.e., > 0.05 m 2 g −1 at λ = 440 nm) corresponded with locations of the upper estuary and SF where particulates were mineral-rich and/or their mean diameter was relatively small. The variability of two optical proxies (the spectral slope of particulate beam attenuation coefficient and the mass-specific particulate absorption coefficient, hereafter γ and Svis, respectively) with respect to changes in particle size distribution (PSD) and chemical composition was also examined. The slope of the PSD was correlated with b i * (550) (Spearman rank correlation coefficient ρ s up to 0.37) and a i * (440) estimates (ρ s up to 0.32) in a comparable way. Conversely, the contribution of particulate inorganic matter to total mass of SPM (F SPM PIM ) had a stronger correlation with a i * coefficients at a wavelength of 440 nm (ρ s up to 0.50). The magnitude of γ was positively related to F SPM i or the contribution of size fraction i to the total mass of SPM (ρ s up to 0.53 for i = 0.2-0.4 µm). Also, the relation between γ and F SPM PIM variability was secondary (ρ s = −0.34, P > 0.05). Lastly, the magnitude of Svis was inversely correlated with a SPM * (440) (ρ s = −0.55, P = 0.04) and F SPM PIM (ρ s = −0.62, P = 0.018) in sampling locations with a larger marine influence (i.e., lower estuary).

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Monitoring the spreading of the Amazon freshwater plume by MODIS, SMOS, Aquarius, and TOPAZ

Korosov¹,

Counillon²,

Johannessen³

2015

JGR Oceans

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A synergistic tool for studying the Amazon River plume dynamics based on a novel algorithm for deriving sea surface salinity (SSS) from MODIS reflectance data together with SSS data from the SMOS and Aquarius satellites and the TOPAZ data assimilation system is proposed. The new algorithm is based on a neural network to relate spectral remote sensing reflectance measured by MODIS with SSS measured by SMOS in the Amazon River plume. The algorithm is validated against independent in situ data and is found to be valid in the range of SSS from 29 to 35 psu, for the period of highest rates of Amazon River discharge with RMSE 5 0.79 psu and r 2 5 0.84. Monthly SSS fields were reconstructed from the MODIS data for late summers from 2002 to 2012 at a 10 km resolution and compared to surface currents and SSS derived from the TOPAZ reanalysis system. The two data sets reveal striking agreement, suggesting that the TOPAZ system could be used for a detailed study of the Amazon River plume dynamics. Both the position and speed of the North Brazilian Current as well as the spreading of the Amazon River plume are monitored. In particular, a recurrent mechanism was observed for the spreading of the rivers plumes, notably that the fresh water is usually advected toward the Caribbean Sea by the North Brazilian Current but get diverted into the tropical Atlantic when North Brazilian Current Rings are shed.

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Light absorption and fluorescence properties of chromophoric dissolved organic matter (CDOM), in the St. Lawrence Estuary (Case 2 waters)

Cited by 132 publications

References 30 publications

DOC, absorption and fluorescence properties of estuarine and coastal waters of the Northern Tyrrhenian Sea

DOC, absorption and fluorescence properties of estuarine and coastal waters of the Northern Tyrrhenian Sea

Optical properties of size fractions of suspended particulate matter in littoral waters of Québec

Monitoring the spreading of the Amazon freshwater plume by MODIS, SMOS, Aquarius, and TOPAZ

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