Oscillating Adriatic temperature and salinity regimes mapped using the Self-Organizing Maps method

Matić, Frano; Kovač, Žarko; Vilibić, Ivica; Mihanović, Hrvoje; Morović, Mira; Grbec, Branka; Leder, Nenad; Džoić, Tomislav

doi:10.1016/j.csr.2016.11.006

Cited by 24 publications

(5 citation statements)

References 43 publications

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“…Positive ADT values indicate a cyclonic BiOS regime in the northern Ionian Sea 18 and the inflow of the ultraoligotrophic Eastern Mediterranean waters to the Adriatic, which are characterized by lower nutrient content as well as lower primary production and biological activity. These regime shifts occur on a decadal timescale and require up to a few years to make a full transition in the Adriatic 20 , 23 , 37 . Correlations with the bivalve chronology are negative through the year, but are strongest during late autumn and winter (October-February) when the inflow of saline waters to the Adriatic through the Otranto Strait is the largest 38 .…”

Section: Discussionmentioning

confidence: 99%

Using bivalve chronologies for quantifying environmental drivers in a semi-enclosed temperate sea

Peharda

Vilibić

Black³

et al. 2018

Sci Rep

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Annual growth increments formed in bivalve shells are increasingly used as proxies of environmental variability and change in marine ecosystems, especially at higher latitudes. Here, we document that well-replicated and exactly dated chronologies can also be developed to capture oceanographic processes in temperate and semi-enclosed seas, such as the Mediterranean. A chronology is constructed for Glycymeris pilosa from a shallow embayment of the northern Adriatic and extends from 1979 to 2016. The chronology significantly (p < 0.05) and positively correlates to winter sea surface temperatures, but negatively correlates to summer temperatures, which suggests that extreme winter lows and extreme summer highs may be limiting to growth. However, the strongest and most consistent relationships are negative correlations with an index of the Adriatic-Ionian Bimodal Oscillating System (BiOS) for which positive values indicate the inflow of the ultraoligotrophic Eastern Mediterranean waters to the Adriatic. In contrast, the substantial freshwater flows that discharge into the Adriatic do not correlate to the bivalve chronology, emphasizing the importance of remote oceanographic processes to growth at this highly coastal site. Overall, this study underscores the potential of bivalve chronologies to capture biologically relevant, local- to regional-scale patterns of ocean circulation in mid-latitude, temperate systems.

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Section: Discussionmentioning

confidence: 99%

Using bivalve chronologies for quantifying environmental drivers in a semi-enclosed temperate sea

Peharda

Vilibić

Black³

et al. 2018

Sci Rep

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“…For an assessment of the processes eventually contributing to the maxima, we analyzed heat fluxes and E-P over the Southern Adriatic-using the ERA Interim dataset (available from 1979), discharges of the major Adriatic river, Po River (available from 1961, Raicich, 1996;Vilibić et al, 2016), and the decadal oscillations driven by the BiOS regime (based on satellite altimetry data available since 1993). In general, from 1961 to 2016 several periods with high salinities along the Palagruža Sill transect were observed : 1968: -1971: , 1975: -1976: , 1978: -1982: , 1987: -1990: -2005Matić et al, 2017) and in the 2011-2016 period (Figure 7). These periods (at least after 1993, when altimetry data became available) were mostly related to cyclonic circulation regime in the Northern Ionian Sea (with 1-2 years phase shift).…”

Section: Past High Surface and Near-surface Salinity Events In The Adriaticmentioning

confidence: 93%

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

et al. 2021

Self Cite

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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.

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“…(2003). From then on, it has been widely applied, for example, to identify patterns of sea temperature, salinity, and current distribution (C. Chen et al., 2018; Iskandar, 2010; Liu et al., 2016; Matić et al., 2017; Y. Yin et al., 2014; Zeng et al., 2017), as well as ecological elements including phytoplankton diversity and harmful algal blooming events (Q. Chen et al., 2014; El Hourany et al., 2019; Hwang et al., 2019).…”

Section: Methodsmentioning

confidence: 99%

Cross‐Shelf Penetrating Fronts of Buoyant Coastal Currents Around the Headland

Zhou

2023

JGR Oceans

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Estuarine water mixed with oceanic water moves along the coast as a buoyant coastal current, which usually follows isobaths if the coast is largely straight. A bottom-trapped river plume is thus often formed in which the bottom front stands at a specific location (Chapman & Lentz, 1994;Lentz & Helfrich, 2002). Hence, most of the buoyant current moves in the along-shelf rather than in the cross-shelf direction. Ideally, inside the river mouth different-sourced water mixes and exchanges (

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Oscillating Adriatic temperature and salinity regimes mapped using the Self-Organizing Maps method

Cited by 24 publications

References 43 publications

Using bivalve chronologies for quantifying environmental drivers in a semi-enclosed temperate sea

Using bivalve chronologies for quantifying environmental drivers in a semi-enclosed temperate sea

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

Cross‐Shelf Penetrating Fronts of Buoyant Coastal Currents Around the Headland

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