Changes in the Adriatic oceanographic properties induced by the Eastern Mediterranean Transient

Vilibić, Ivica; Matijević, Slavica; Šepić, Jadranka; Kušpilić, Grozdan

doi:10.5194/bg-9-2085-2012

Cited by 58 publications

(59 citation statements)

References 51 publications

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“…This may be a result of advection of colder intermediate waters from the Ionian Sea. Strong inflow of these waters was observed in the early 1990s, when high volumes of MAW waters were dragged from the western Mediterranean into the Ionian Sea and the Adriatic, as a consequence of large westward outflow of the EMT‐generated dense waters through the Strait of Sicily [ Vilibić et al ., ; Gačić et al ., ]. This is in concordance with temporal distribution of BMU2, which mostly occurred between 1991 and 1995 (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Mapping of decadal middle Adriatic oceanographic variability and its relation to the BiOS regime

et al. 2015

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We analyzed long‐term time series of temperature, salinity, and dissolved oxygen (DO) concentrations collected along the Palagruža Sill transect (middle Adriatic) between 1952 and 2010. The data have been mostly collected on seasonal basis, allowing for extraction of seasonal signal from the series. By applying Self‐Organizing Maps (SOM) method, a kind of unsupervised neural network method, the processes on a decadal time scale emerged as the most relevant for changes of oceanographic properties in the middle Adriatic area. Sensitivity studies revealed that oceanographic patterns obtained by SOM were not sensitive to shortening of time series, to removal of data from one station or to removal of DO from the analysis. Simultaneous SOM‐based mapping of sea surface heights in the northern Ionian Sea, with these heights serving as a proxy for the Adriatic‐Ionian Bimodal Oscillating System (BiOS), revealed asymmetry between anticyclonic and cyclonic BiOS patterns and correlated the decadal oscillations in the middle Adriatic with the reversals in the BiOS circulation regimes. These reversals are found to either rapidly change oceanographic properties in the middle Adriatic (e.g., during the Eastern Mediterranean Transient) or to change them with a time lag of 2–3 years. The mapped connections may be used for a short‐time (a few years) forecasting of the Adriatic oceanographic properties or for mapping future climate decadal oscillations as seen by ocean climate models.

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Section: Resultsmentioning

confidence: 99%

Mapping of decadal middle Adriatic oceanographic variability and its relation to the BiOS regime

et al. 2015

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“…If the dense water outflow is strong enough, it could rapidly convert the BiOS circulation regime into the anticyclonic and prevent the exchange of Adriatic waters with the rest of the Mediterranean in the following years. Furthermore, the changes in BiOS phases are strongly influencing the biogeochemistry of the Adriatic Sea [ Civitarese et al ., ; Vilibić et al ., ] and correct quantification of the extreme DWF is necessary for better reproduction and forecasting of different regimes of Adriatic‐Ionian thermohaline circulation cell.…”

Section: Discussionmentioning

confidence: 99%

Extreme cooling and dense water formation estimates in open and coastal regions of the Adriatic Sea during the winter of 2012

Janeković

Mihanović

Vilibić

et al. 2014

J. Geophys. Res. Oceans

107

111

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Generation of dense waters in the Adriatic Sea during an extreme cooling event in the winter of 2012, including its preconditioning and spreading phases, have been investigated using the one-way coupled ROMS and the ALADIN/HR modeling system. Both climatological and real river fluxes are used in the simulations. Aside from the ''convenient'' dense water formation areas located at the northernmost Adriatic shelf, we found that a similar amount of dense water, with slightly lower density, was formed in the eastern and deeper Adriatic coastal area, which was subjected to extreme heat losses (up to 2000 W/m 2 ) during peak cooling periods. This part of the Adriatic has been known for extreme cooling during wintertime bora outbreaks; nevertheless, no ocean model study has previously reproduced dense water formation in this area. The most likely reason for that was an overestimate of river discharges introduced to ocean models. From newly available data, we estimated that the contribution of eastern Adriatic rivers between the Neretva River and Rijeka Bay is more than six times lower than what has been previously documented. Transport of dense water toward the middle Adriatic had a peak value of about 0.6 Sv, while the speed of initial bottom density current surpassed 40-50 cm/s, which is several times faster than past events. Different pathways of the dense water toward the middle and south Adriatic depressions have also been documented. The contribution of the eastern coastal Adriatic area to the overall north Adriatic dense water formation has been quantified and discussed for average and low freshwater load conditions, indicating that this part of the Adriatic is a common place for dense water generation.

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“…Episodes of intermediate to deepwater formation in the Aegean Sea, known as the Eastern Mediterranean Transient (Roether et al, 1996), occurred from 1988 to 1995 and affected convection in the SAS through the Ionian Sea (Gačić et al, 2013;Roether et al, 1996). Strengthened decadal scale variability and anticyclonique BiOS circulation was observed during the Eastern Mediterranean Transient (Vilibić et al, 2012), which happened to be a period of stable positive NAO state. However, the driving mechanisms of the BiOS and notably the role of the atmosphere are still debated (Pinardi et al, 2015).…”

Section: Regional Settingmentioning

confidence: 99%

Deltaic and Coastal Sediments as Recorders of Mediterranean Regional Climate and Human Impact Over the Past Three Millennia

Jalali

Sicre

Klein

et al. 2018

Paleoceanog and Paleoclimatol

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Deltaic and shallow marine sediments represent unique natural archives to study the evolution of surface coastal ocean water properties as compared to environmental changes in adjacent continents. Sea surface temperatures (SSTs) and higher plant biomarker records were generated from the Rhone and Var River deltaic sediments (NW Mediterranean Sea), and three sites in the South Adriatic Sea (Central/Eastern Mediterranean Sea), spanning all or part of the past three millennia. Because of the high sediment accumulation rates at all core sites, we were able to produce time series at decadal time scale. SSTs in the Gulf of Lion and the convection area of the South Adriatic Sea indicate similar cold mean values (around 17 °C) and pronounced cold spells, reflecting strong wind‐driven surface water heat loss. However, they differ in the rate of postindustrial warming, which is steeper in the Gulf of Lion. The three Adriatic Sea SST records are notably different reflecting different hydrological influence from nearshore to open sea sites. The compositional features of higher plant n‐alkanes in the Rhone and Var delta sediments and inferred vegetation types show differences consistent with the latitudinal extension of the drainage basins of both river streams. In the Adriatic Sea, both coastal and open sea sediments indicate enhanced land‐derived material over the past 500 years, which is not seen in the NW Mediterranean record. We suggest that increased erosion as the result of changes in land use practices is the most likely cause for this trend.

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Changes in the Adriatic oceanographic properties induced by the Eastern Mediterranean Transient

Cited by 58 publications

References 51 publications

Mapping of decadal middle Adriatic oceanographic variability and its relation to the BiOS regime

Mapping of decadal middle Adriatic oceanographic variability and its relation to the BiOS regime

Extreme cooling and dense water formation estimates in open and coastal regions of the Adriatic Sea during the winter of 2012

Deltaic and Coastal Sediments as Recorders of Mediterranean Regional Climate and Human Impact Over the Past Three Millennia

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