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Biogeo-optical modeling of SPM in the St. Lawrence Estuary
Ist Teil von
Canadian journal of remote sensing, 2012-04, Vol.38 (2), p.197-209
Ort / Verlag
Taylor & Francis
Erscheinungsjahr
2012
Link zum Volltext
Quelle
Taylor & Francis
Beschreibungen/Notizen
Optical and chemical measurements were obtained in the St. Lawrence Estuary during spring of 2000 and 2001 to develop three biogeo-optical models for estimating concentration of suspended particulates (SPM) in optically complex waters where light absorption in the visible range is dominated by coloured dissolved organic matter (CDOM). SPM was computed from remote sensing reflectance (R
rs
) calculated at 670 and 550 nm (SPM = 50.35 [R
rs
(670)/ R
rs
(555)]
2.03
) and corrected using a linear function related to the absorption coefficient of CDOM measured at a wavelength of 412 nm (a
CDOM
(412)). The resulting CDOM-unbiased estimates of SPM had an uncertainty of ± 40%, a major improvement with respect to uncorrected measurements (relative error up to 85%) or theoretical calculations assuming a constant SPM and a variable a
CDOM
(412) (up to 400%). Spatial patterns of unbiased SPM derived from SeaWiFS (Sea-viewing Wide Field-of-view Sensor) during spring 1998 were consistent with general trends previously described based on shipboard data. Satellite observations also highlighted the important association between hydrographic features and horizontal distribution of suspended solids in surface waters of the Estuary.