Quantile regression of satellite-derived CDOM for river plume dispersion in southern Hudson Bay

• Main Authors: Basu, Atreya, Mccullough, Greg, Bélanger, Simon, Doxaran, David, Sydor, Kevin, Barber, David
• Other Authors: Laboratoire d'océanographie de Villefranche (LOV), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2023
• Subjects: [SDE]Environmental Sciences; Hudson Bay; James Bay
• Online Access: https://hal.science/hal-04064194; https://doi.org/10.5194/egusphere-egu23-9170

International audience Physical and biogeochemical processes in coastal waters are shaped by salinity variation induced by river water mixing. As salinity is intrinsic to any aquatic ecosystem, any change will challenge the ecological framework. Thus, space-based monitoring of salinity in regions susceptible to salinity changes, such as estuaries and nearshore waters, is the need of the moment and supports Sustainable Development Goal 14 of the United Nations. Therefore, the salinity monitoring process addresses salinization/de-salinization issues of transitional waters. Current sea surface salinity products from satellites, such as Soil Moisture and Ocean Salinity (SMOS) and Soil Moisture Active Passive (SMAP), exclude shallow waters, creating a salinity data gap in the land-ocean continuum. Such a gap in salinity considerably prevents continuous and synoptic river plume monitoring using satellite observations. Light absorption properties were studied in the coastal waters of Hudson Bay and James Bay, the shallow inland seas of Canada, to overcome the problem. River water carries terrestrial signals into the estuarine and coastal seas through dissolved organic matter (DOM) and inorganic sediments. DOM and sediments in seawater interact with the visible spectrum of solar radiation that can be mapped using ocean color remote sensing. Colored dissolved organic matter (CDOM), the optically active portion of DOM, dominates the light absorption budget at 412 nm in the coastal waters of Hudson Bay and James Bay, followed by the suspended inorganic solids. Hudson Bay waters were clearer relative to James Bay, with a higher content of river-sourced CDOM. The concentration of these river-derived optical tracers decayed offshore. CDOM underwent conservative dilution with increasing salinity, while suspended sediments were non-conservative. Therefore, based on the conservative CDOM and salinity relationship, a quantile regression approach was developed to quantify the Nelson River water dispersion in Hudson Bay using ...