Naslov
Surface active organic carbon as an indicator of change in the marine system

Autori
Simonović, Niki ; Marguš, Marija ; Dautović, Jelena ; Ciglenečki, Irena

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Skup
ECSA 59: Using the best scientific knowledge for the sustainable management of estuaries and coastal seas

Mjesto i datum
Donostia-San Sebastián, Španjolska, 05.09.2022. - 08.09.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
organic carbon ; surface active substances (SAS) ; dissolved organic carbon (DOC) ; Rogoznica Lake ; Northern Adriatic

Sažetak
Organic carbon (C) is a constituent of many processes in the sea and can be an important indicator of changes in the marine system. Due to climate alterations, extreme weather events (droughts, floods, tropical cyclones, heat waves, heavy rainfall, changes in temperature, salinity, circulation, mixing, strong winds, Saharan dust transport) are occurring with increasing frequency and intensity. Such events lead to unusual phenomena (mucilaginous algal blooms, red tides, invasive jellyfish blooms, occurrence of hypoxia/anoxia conditions) that contribute to the degradation of the marine environment and subsequently promote anomalous accumulation of organic matter (OM). An important subset of dissolved and particulate organic carbon (DOC, POC) in the marine environment is surface active substances (SAS). These classes of compounds are the most reactive fraction of OM and tend to adsorb at different phase boundaries and affect both abiotic and biotic processes. SAS in the sea are mainly produced autochthonously by biological activity (primary and secondary production, grazing), while part of SAS may also be introduced allochthonously (terrestrial and atmospheric input). DOC normalized surfactant activity (NSA) is comparable to the NSA of model substances, which could be representative of the composition/processes of SAS/OM in different natural samples/environments. In this study, the qualitative and quantitative changes in the properties of OM, revealed by the change in the NSA values, will be presented on a short- and long-term scale for two sites on the Adriatic coast: 1) stratified euxinic water column of a marine lake (Rogoznica Lake ; 43°32'N, 15°58'E) on the eastern Adriatic coast and 2) Northern Adriatic during unusual phenomena of gelatinous zooplankton and red tide blooms. Additionally, the contribution of transparent exopolymer particles (TEP) and fecal pellets to surface active organic C will be discussed. Both marine systems show similar long-term changes. This work is funded by the MARRES project, IP- 2018-01-1717.

Izvorni jezik
Engleski

Znanstvena područja
Interdisciplinarne prirodne znanosti

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