Variability and relationships between particle sizes, composition and optical properties of suspended particulate matter in the coastal waters of western Spitsbergen, assessed through measurements of size-fractionated seawater samples

• Autorzy: Woźniak Sławomir B. , Litwicka Dagmara , Stoń-Egiert Joanna

Identyfikatory

DOI

10.5697/EZNP4044

• Języki publikacji: EN

Abstrakty

EN

Measurements of inherent optical properties (IOPs) and characteristics of concentration and composition of suspended particles were made on original and size-fractionated surface water samples from Arctic fjords and coastal waters of western Spitsbergen in the Svalbard archipelago, in the summer months of 2021 and 2022. Optical measurements included the spectral scattering coefficient of particles, and spectral absorption coefficients of particles as well as depigmented (non-algal) particles and phytoplankton. Assemblages of suspended particles were characterised by measuring the mass concentrations of suspended particulate matter (SPM), particulate organic matter (POM), particulate inorganic matter (PIM), and phytoplankton pigments including chlorophyll a (Chla ). All measurements were performed on original (unfiltered) seawater and on size-fractionated samples obtained by filtration using a combination of nylon meshes and membrane filters. This allowed us to determine the contribution of the fractions of very small (VS), small (S) and combined medium and large particles (ML) to the total SPM and Chla, as well as to the total scattering and absorption coefficients. The obtained results: (i) indirectly indicate a clear variability in particle size distributions occurring in the studied marine environment (e.g., the contribution of ML size fraction to SPM (the ratio SPMML/SPM) varied between 0.10 and 0.52); (ii) indicate noticeable differences in composition between size fractions (e.g., the POM/SPM ratio was on average 0.21 for the S fraction, and 0.34 and 0.32 for the VS and ML fractions, respectively); (iii) in most cases indicate that the fraction S had the largest contribution to all analysed spectral optical coefficients, followed by the VS and ML fractions (the average contributions of the S fraction to scattering coefficient of particles and absorption coefficient of particles or depigmented (non-algal) particles were above 0.6 in the entire analysed spectral ranges); (iv) allowed for the identification of statistical relationships between selected characteristics describing changes in particle size and variability of particle IOPs (e.g., we observed statistical relations between SPMML/SPM and the spectral slope of scattering coefficient by particles, as well as SPM-specific coefficients of scattering by particles).

Słowa kluczowe

EN

inherent optical properties (spectral scattering coefficient of particles spectral absorption coefficients of particles depigmented (non-algal) particles and phytoplankton); composition of suspended particulate matter (mass concentrations of particulate organic matter particulate inorganic matter chlorophyll a; seawater samples fractionated by particle size; contributions of size fractions of suspended matter to particle concentration metrics and optical coefficients; relations between metrics of size composition and optical coefficients; arctic coastal waters

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2024
• Tom: No. 66 (4)
• Strony: Art. no. 66403
• Opis fizyczny: Bibliogr. 33 poz., rys., tab., wykr.

Twórcy

autor

Woźniak Sławomir B.

• Institute of Oceanology of the Polish Academy of Sciences, Sopot, Poland

autor

Litwicka Dagmara

• Institute of Oceanology of the Polish Academy of Sciences, Sopot, Poland

• https://orcid.org/0000-0002-6701-8067

autor

Stoń-Egiert Joanna

• Institute of Oceanology of the Polish Academy of Sciences, Sopot, Poland

• https://orcid.org/0000-0002-4274-8979

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