Naslov
Multi-model analysis of the Adriatic-Ionian thermohaline circulation using an ensemble of multi-decadal regional ocean simulations

Autori
Dunić, Natalija ; Vilibić, Ivica ; Šepić, Jadranka ; Sevault, Florence ; Somot, Samuel ; Waldman, Robin ; Arsouze, T. ; Pennel, R. ; Nabat, P. ; Jorda, Gabriel

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

Skup
IAPSO-IAMAS-IAGA Joint Assembly

Mjesto i datum
Cape Town, Južnoafrička Republika, 27.08.2017. - 01.09.2017

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Adriatic Sea ; Thermohaline processes ; Dense water formation ; Decadal variations ; Regional multi-model climate modelling

Sažetak
Dense water formation (DWF) is the major driver of the Adriatic thermohaline circulation (THC) and water mass exchanges with the Ionian Sea and Eastern Mediterranean. It is highly variable in both space (down to 1 km) and time (down to 1 hour), demanding mesoscale approach in both atmospheric and ocean modelling. Recent analysis based on long-term in-situ measurements revealed a possible change in the Adriatic THC, showing a significant reduction of the DWF processes. On top of that, the circulation and Adriatic thermohaline properties resemble substantial decadal variations, which are coherent with the sea level height fluctuations in the northern Ionian Sea. This phenomenon is called Adriatic-Ionian Bimodal Oscillating System (BiOS). An initial study has shown that a regional ocean hindcast model succeeded to reproduce only partially the patterns of the BiOS, so that an extension of the analysis to a variety of state-of-the-art hindcast models is required for proper assessment of the changes over a long term. To achieve that, we took seven different NEMOMED regional hindcast simulations covering ERA Interim period (1980-2012) and analyzed them focusing on their capacities to reproduce the Adriatic DWF and the BiOS. Verification of the models has been carried out on the in-situ long-term data collected over the Palagruža Sill transect, at Jabuka Pit and deep South Adriatic Pit, as well as on the AVISO+ satellite altimetry data. We performed multi-model analysis in order to investigate the effects of spatial (from 10 to nearly 2 km) and vertical (43 to 75 z-levels) resolution, atmosphere model resolution (50 and 12 km) and high-frequency coupling, as well as the effects of the aerosol representation. In addition, we investigated impact of freshwater forcing using different climatologies or river coupling on the interannual and decadal variations of the Adriatic-Ionian thermohaline properties.

Izvorni jezik
Engleski

Znanstvena područja
Geofizika

POVEZANOST RADA