Analysis of the Distribution of Suspended Particulate Matter, Bacteria, Chlorophyll a and PO4 in the Upper St. Lawrence Estuary, Using a Two-Dimensional Box Model

1990 ◽  
pp. 59-65
Author(s):  
Jean Painchaud ◽  
Denis Lefaivre ◽  
Gilles-H. Tremblay ◽  
Jean-Claude Therriault
Keyword(s):  
Particulate Matter ◽  
Chlorophyll A ◽  
Suspended Particulate Matter ◽  
Box Model ◽  
Two Dimensional ◽  
Lawrence Estuary ◽  
Suspended Particulate ◽  
St Lawrence Estuary

Geochemistry of suspended particulate matter in the Saguenay Fjord

1978 ◽  
Vol 15 (6) ◽  
pp. 1002-1011 ◽  
Author(s):  
Bjørn Sundby ◽  
Douglas H. Loring
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
Major Elements ◽  
Time And Space ◽  
Lawrence Estuary ◽  
Saguenay Fjord ◽  
Suspended Particulate ◽  
Bottom Waters ◽  
St Lawrence Estuary

Analysis of major elements in suspended particulate matter from the Saguenay Fjord in May and September 1974 shows that the content of Si, Al, Ca, Mg, and K remain relatively constant in time and space, reflecting the constancy of the silicate mineralogy of the particulate matter. Large variations in time and space occur, however, in the content of Fe and Mn. High levels of Fe occur in particulate matter from near-bottom waters of the fjord during both time periods. Variations in the Fe/Al ratios indicate that Fe is enriched in the non-silicate fraction of the particulate matter (oxides, hydroxides, etc.) in the near-bottom waters, but not elsewhere. In contrast, Mn is enriched relative to both Al and Fe in particulate matter from intermediate depths, and varies in time and space. This is attributed to the in situ uptake of Mn from seawater and (or) the input of particles, already containing high levels of Mn, from the St. Lawrence Estuary.

Recent distribution, inventories and temporal trends of suspended particulate matter in the St. Lawrence Estuary, Canada

2019 ◽  
Vol 29 ◽  
pp. 100664
Author(s):  
Michel Lebeuf ◽  
Domynick Maltais ◽  
Pierre Larouche ◽  
Diane Lavoie ◽  
Denis Lefaivre ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
Temporal Trends ◽  
Lawrence Estuary ◽  
Suspended Particulate ◽  
St Lawrence Estuary

The dynamics of suspended particulate matter (SPM) and chlorophyll- a from intratidal to annual time scales in a coastal turbidity maximum

2017 ◽  
Vol 127 ◽  
pp. 105-118 ◽  
Author(s):  
C.M. van der Hout ◽  
R. Witbaard ◽  
M.J.N. Bergman ◽  
G.C.A. Duineveld ◽  
M.J.C. Rozemeijer ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Chlorophyll A ◽  
Time Scales ◽  
Suspended Particulate Matter ◽  
Turbidity Maximum ◽  
Suspended Particulate ◽  
Annual Time

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

2017 ◽  
Vol 14 (23) ◽  
pp. 5297-5312 ◽  
Author(s):  
Gholamreza Mohammadpour ◽  
Jean-Pierre Gagné ◽  
Pierre Larouche ◽  
Martin A. Montes-Hugo
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
Total Mass ◽  
Lower Estuary ◽  
Lawrence Estuary ◽  
Specific Absorption ◽  
Size Fractions ◽  
Saguenay Fjord ◽  
Suspended Particulate ◽  
Fraction I

Abstract. Mass-specific absorption (ai∗(λ)) and scattering (bi∗(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 aSPM∗) had low values (e.g., < 0.01 m2 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 aSPM∗ values (i.e., > 0.05 m2 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 bi∗(550) (Spearman rank correlation coefficient ρs up to 0.37) and ai∗(440) estimates (ρs up to 0.32) in a comparable way. Conversely, the contribution of particulate inorganic matter to total mass of SPM (FSPMPIM) had a stronger correlation with ai∗ coefficients at a wavelength of 440 nm (ρs up to 0.50). The magnitude of γ was positively related to FSPMi or the contribution of size fraction i to the total mass of SPM (ρs up to 0.53 for i = 0.2–0.4 µm). Also, the relation between γ and FSPMPIM variability was secondary (ρs = −0.34, P > 0.05). Lastly, the magnitude of Svis was inversely correlated with aSPM∗(440) (ρs = −0.55, P = 0.04) and FSPMPIM (ρs = −0.62, P = 0.018) in sampling locations with a larger marine influence (i.e., lower estuary).

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