Naslov
Two millennia relative sea-level change and climate change in the northern Adriatic based on algal rims

Autori
Faivre, Sanja ; Bakran-Petricioli, Tatjana ; Barešić, Jadranka ; Horvatinčić, Nada

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

Izvornik
GEOSUB, International congress 2015, Underwater geology, Proceeedings / Furlani, Stefano ; Antonioli, Fabrizio ; Anzidei, Marko et al. - Trst, 2015, 40-40

Skup
GEOSUB, International congress 2015, Underwater geology

Mjesto i datum
Trst, Italija, 13.10.2015. - 14.10.2015

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
sea-level change ; climate change ; Adriatic

Sažetak
The bimillennium sea-level curves along the Eastern Adriatic coast are based on a number of markers. Those are primarily archaeological coastal remains as well as geomorphological and sedimentological markers. The studies of sea-level variations are today pluridisciplinarily approached so different markers are used and, if possible, combined. However, most of the methods used till now do not provide enough precision. As the studying period is short the error bars are still too large. In order to provide more precision and better accuracy of sea-level curves the latest research along the eastern Adriatic has been centred on algal rims as sea-level markers. Fossil bio-constructions formed by alga Lithophyllum byssoides (Lamarck) Foslie have proven to be precise sea-level indicators (±10 cm) in microtidal environments. Under favourable conditions L. byssoides build up reef like bioconstructions just above the biological mean sea-level which can be 14C dated. Algal rims from different locations in the Northern Adriatic have been analysed. The obtained 14C ages of 31 algal carbonate samples have been further corrected for the marine radiocarbon reservoir effect and then related to phases of relative sea-level changes and climate changes during the last two millennia. The coralline algae growth and cell calcification depend on temperature and light variability so they could also register environmental signals. The δ18O values of algae from temperate environments could be used as a paleotemperature proxy, because they deposit carbonate in isotopic equilibrium with ambient seawater. Consequently, a strong temperature dependence of algal δ18O ratios in comparison with sea surface and air temperatures was demonstrated. Our results reveal the close relationship between biological, geomorphological and archaeological sea-level markers and environmental conditions on the studied area in the past and the clear need of such multidisciplinary approach in the study of the relative sea level changes.

Izvorni jezik
Engleski

Znanstvena područja
Biologija, Geografija

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