Effects of different conditions on particle dynamics and properties in West-Estonian coastal areas

• Autorzy: Uusõue Mirjam , Ligi Martin , Kutser Tiit , Bourrin François , Uudeberg Kristi , Kangro Kersti , Paavel Birgot

Identyfikatory

DOI

10.1016/j.oceano.2022.06.006

• Języki publikacji: EN

Abstrakty

EN

Satellite sensors are used to monitor water on a large scale. One of the key variables defining the water-leaving signal is suspended particulate matter (SPM) and thus it is important to understand its properties to improve remote sensing algorithms. However, only a few studies investigating the variability of SPM properties (concentration, nature and size) under different seasonal, weather and geographical conditions have been carried out in the Baltic Sea. We focused on relatively shallow areas (maximum depth of 10 m) where there is strong sediment transport by rivers and resuspension of the particles by wave action and advection by currents. Eleven field campaigns were conducted using a set of instruments measuring inherent optical properties, auxiliary data, and, in Pärnu Bay, also particle size distributions. The results showed that the SPM concentrations, particulate absorption, mass-specific particulate scattering, and backscattering varied temporally and spatially from 5.5–19.6 g m−3, 0–5.62 m−1, 0.08–1.45 m2 g−1, and 0.0009–0.25 m2 g−1, respectively. The spectral backscattering ratio, which in general is considered to be constant in bio-optical remote sensing algorithms, was actually wavelength-dependent and varied between 0.005 and 0.09 depending on the origin of the particles (organic or mineral matter), particle size distribution, weather conditions, and location. In situ particle size measurements in coastal waters of Pärnu Bay also showed that resuspended fine clay particles agglomerated into flocs of >30 µm in the brackish waters of the Baltic Sea having random shapes and different sizes.

Słowa kluczowe

EN

suspended particulate matter; inherent optical properties; backscattering ratio; particle size distribution; aggregation

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2022
• Tom: No. 64 (4)
• Strony: 694--716
• Opis fizyczny: Bibliogr., 86 poz., fot., map., rys., tab, wykr.

Twórcy

autor

Uusõue Mirjam

• Tartu Observatory, University of Tartu, Tartumaa, Estonia

autor

Ligi Martin

• Tartu Observatory, University of Tartu, Tartumaa, Estonia

• https://orcid.org/0000-0003-2442-5719

autor

Kutser Tiit

• Estonian Marine Institute, University of Tartu, Tallinn, Estonia

• https://orcid.org/0000-0001-9679-1422

autor

Bourrin François

• CEFREM, UMR 5110 CNRS, UPVD, Perpignan Cedex, France

• https://orcid.org/0000-0003-0266-6992

autor

Uudeberg Kristi

• Tartu Observatory, University of Tartu, Tartumaa, Estonia

autor

Kangro Kersti

• Tartu Observatory, University of Tartu, Tartumaa, Estonia

• https://orcid.org/0000-0001-6143-9330

autor

Paavel Birgot

• Estonian Marine Institute, University of Tartu, Tallinn, Estonia

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Uwagi

PL

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).