Naslov
Marine bio-chemical variabilities and secondary organic aerosols over the Middle Adriatic area: Insight into organosulfur prevalence

Autori
Cvitešić, Ana ; Kroflič, .A. ; Ljubešić, Zrinka ; Šala, M. ; Grgić, I. ; Ciglenečki, Irena ; Frka. Sanja

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
European Aerosol Conference 2017 : Abstracts / - , 2017

Skup
European Aerosol Conference 2017

Mjesto i datum
Zürich, Švicarska, 27.08.2017. - 01.09.2017

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
marine aerosols ; secondary organic matter ; organosulfur compounds ; sea surface microlayer

Sažetak
As the oceans cover approximately 70% of the Earth's surface, marine aerosols are the most important natural aerosol system at the global level. Considerable influence of marine aerosols on the global radiative budget has been proven through their enhanced ability to act as cloud condensation nuclei (CCN) on which cloud droplets are formed. Marine organic aerosols, primarily emitted into the atmosphere via bubble bursting as well as formed through secondary processes, including oxidation of volatile organic compounds such as dimethyl sulfide (DMS), have been also shown to affect the chemistry of the marine environment (O’Dowd et al., 2015). Besides, marine-derived sulfate is thought to be the key precursor to marine organosulfur compounds (OS) serving as markers of multiphase chemical processes leading to SOA formation over the marine areas. However, mechanisms responsible for the SOA formation in the marine atmosphere are still not completely clarified (Surratt et al., 2008). Nevertheless, the sea surface microlayer (SML) being the very uppermost layer of the ocean at the air-sea interface, has a particular role in hindering a range of global dynamic exchange processes between the ocean and the atmosphere and serving as a medium for accumulation and transportation of marine organic matter (OM) up into the atmosphere (e.g. Engel and Galgani, 2016). Up to now, a relation between the chemical composition, physical-chemical properties and mechanisms responsible for SOA formation in the marine atmosphere are not completely understood, resulting in a significant uncertainty of marine SOA impact on the Earth´s climate. In this work, an interdisciplinary approach to determine a detail chemical composition of fine marine aerosols, with a special emphasis on OS constituents, during 1-year period at the Middle Adriatic Sea coastal area has been applied. A complex chemical approach, comprising ion chromatography, high temperature catalytic oxidation, inductively coupled plasma optical emission spectrometry, high pressure liquid chromatography-tandem mass spectrometry and electrochemistry, enabled the determination of parameters such as water soluble anions and cations, total and water soluble organic carbon, organosulfur and surfactant content. In order to provide a better insight into the possible sources of SOA over the marine atmosphere, the obtained results have been correlated and supported by the hydrological and biochemical data obtained for the marine SML and the underlaying water (~ 0.5 m depth) samples collected in parallel with fine aerosols. The results point out that during investigated period the formation of SOA components could be driven by the seasonality of marine biological productivity in the marine photic zone but also affected by the photochemical processing and local biomass burning events at the coastal Middle Adriatic area.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA