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Observation, Preconditioning and Recurrence of Exceptionally High Salinities in the Adriatic Sea

Mihanović, Hrvoje; Vilibić, Ivica; Šepić, Jadranka; Matić, Frano; Ljubešić, Zrinka; Mauri, Elena; Gerin, Riccardo; Notarstefano, Giulio; Poulain, Pierre-Marie (2021) Observation, Preconditioning and Recurrence of Exceptionally High Salinities in the Adriatic Sea. Frontiers in marine science, 8 . ISSN 2296-7745

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The paper aims to describe the preconditioning and observations of exceptionally high salinity values that were observed in summer and autumn of 2017 in the Adriatic. The observations encompassed CTD measurements carried out along the well-surveyed climatological transect in the Middle Adriatic (the Palagruža Sill, 1961–2020), Argo profiling floats and several glider missions, accompanied with satellite altimetry and operational ocean numerical model (Mediterranean Forecasting System) products. Typically, subsurface salinity maximum, with values lower than 39.0, is observed in the Southern Adriatic (usually between 200 and 400 m), related to ingressions of saltier and warmer waters originating in the eastern Mediterranean (Levantine Intermediate Water—LIW). However, seasonally strong inflow of warm and high salinity waters (S > 38.8) has been observed much closer to the surface since spring 2015. The main LIW core deepened at the same time (to 400–700 m). Such double-maxima vertical pattern was eventually disturbed by winter convection at the beginning of 2017, increasing salinities throughout the water column. A new episode of very strong inflow of high salinity waters from the Northern Ionian was observed in late winter and spring of 2017, this time restricted almost to the surface. As most of 2017 was characterized by extremely dry conditions, low riverine inputs and warmer than usual summer over the Adriatic and Northern Ionian, salinity values above the sharp and shallow (15–40 m) thermocline significantly increased. The maximum recorded salinity was 39.26, as measured by the Argo float in the Southern Adriatic. Surface salinity maximum events, but with much lower intensity, have been documented in the past. Both past events and the 2017 event were characterized by (i) concurrence with overall high salinity conditions and cyclonic or transitional phase of the Adriatic-Ionian Bimodal Oscillating System, (ii) very low river discharges preconditioning the events for a year or more, (iii) higher-than-average heat fluxes during most of the summer and early autumn periods, forming a stable warm layer above the thermocline, and (iv) higher-than-average E-P (evaporation minus precipitation) acting on this warm surface layer. Importantly, the 2017 event was also preceded by strong near-surface inflow of very saline waters from the Northern Ionian in early 2017.

Item Type: Article
Uncontrolled Keywords: surface salinity maximum; heat fluxes; river discharges; decadal salinity oscillations; Adriatic Sea
Subjects: NATURAL SCIENCES > Geophysics
NATURAL SCIENCES > Geophysics > Physical Oceanography
Divisions: Division for Marine and Enviromental Research
Project titleProject leaderProject codeProject type
Višegodišnje i dekadne oscilacije Jadranskog mora: opažanja, modeliranje i posljediceVilibić, IvicaIP-2016-06-1955HRZZ
Izranjanje i poniranje u području srednjeg JadranaOrlić, MirkoIP-2018-01-9849HRZZ
Školjkaši: Arhiva okolišnih promjena u obalnim morskim ekosustavimaPeharda Uljević, MelitaIP-2019-04-8542HRZZ
Utjecaj valova vezanih uz otok na primarnu produkcijuLjubešić, ZrinkaIP-2020-02-9524HRZZ
Razvoj tehnologije za procjenu autopurifikacijskih sposobnosti priobalnih vodaAndričević, RokoKK.
Depositing User: Ivica Vilibić
Date Deposited: 06 Dec 2021 14:38
DOI: 10.3389/fmars.2021.672210

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