Concentration of suspended particulate matter (SPM) in the water column of the Gdańsk Basin (southern Baltic Sea) in summer 2023 and winter 2024
Description
Concentration of suspended particulate matter (SPM) was measured in the water column of three stations located in the Gdańsk Basin (southern Baltic Sea). Samples were collected in two seasons (July 2023 and January 2024) during a cruise aboard the RV Oceanograf (owned by the University of Gdańsk). Station depths were 52 m for MET2, 82 m for MET1-MP and MET1-REF.
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Water samples for SPM analysis were collected from several depths using the rosette of 8 L Niskin bottles (SBE32 12 Position Carousel System, Sea-Bird). The concentration of SPM was determined gravimetrically following the protocol: immediately after collection, a known volume of seawater was filtered onto 47 mm Whatman GFF glass fiber filters with a nominal pore size of 0.7 μm. The filters were pre-ashed at 450°C and pre-weighed on an analytical balance with an accuracy of 0.1 mg. Fluxes of SPM from the euphotic layer were measured with cylindrical sediment traps. Two cylindrical sediment traps with a length-to-width ratio of 5.57 were deployed for 12-24 hours at a depth of 20 m. Before deployment, each of the cylinders was filled with water from the sampling depth. No preservatives were used because of the short deployment time. Calculated fluxes were corrected for the ambient concentration of SPM. Settling particles were collected on pre-combusted and pre-weighed Whatman GF/F filters.
Institutions
- Uniwersytet GdanskiGdansk