Dissolved gaseous mercury (DGM) in the Mediterranean Sea: Spatial and temporal trends

Kotnik, Jože; Horvat, Milena; Begu, Ermira; Shlyapnikov, Yaroslav; Sprovieri, Francesca; Pirrone, Nicola

doi:10.1016/j.marchem.2017.03.002

Cited by 22 publications

(10 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…DGM in the bottom seawater correlated negatively with DO (r = −0.366, P < 0.01) (Table 3), and the correlation of the bottom seawater was stronger than for the middle and surface waters. DGM concentrations decreased with increasing DO, which is consistent with the results of Bratkič (2016) and Kotnik (2017). DO decreases gradually with increasing depth, while the bottom DO decreases due to the respiration of heterotrophic microorganisms and due to oxygen consumption by organic matter decomposition (Zang et al, 2009).…”

Section: Influence Of Dgm Concentration In the Bottom Seawatersupporting

confidence: 84%

“…DGM in the Yellow Sea and Bohai Sea was lower than that in the South China Sea ((53.7 ± 18.8) pg/L, Ci et al, 2016), while it was higher than the concentrations in the Yellow Sea-Northwest Pacific ((39.6 ± 22.9) pg/L, Liu et al, 2017), and in the Baltic Sea (17.4 pg/L, Wängberg et al, 2001). In spring, DGM in the Yellow and Bohai Seas accounted for less than 2.2% of THg, far lower than for the Yellow Sea-Northwest Pacific surface seawater (8.06%, Liu et al, 2017) and for the Mediterranean Sea (20%, Kotnik et al, 2017) and for other open seas. This ratio was close to that of the nearshore waters of the Yellow Sea (3.6%, Ci et al, 2011a;1.3%, Ci et al, 2011b).…”

Section: Dgm In Surface Seawatermentioning

confidence: 96%

See 1 more Smart Citation

Spatial Differences and Influencing Factors of Dissolved Gaseous Mercury in the Yellow Sea and Bohai Sea in Spring

et al. 2021

View full text Add to dashboard Cite

, different forms of mercury (Hg) in the Yellow Sea and Bohai Sea were measured to study the influencing factors on the distribution and transformation of Hg in spring using a shared cruise. The mean concentration of dissolved gaseous mercury (DGM) in the surface water of the Yellow and Bohai Seas was (44.3 ± 43.9) pg/L, which was close to that in mid-latitude oceans and deep seas. The ratio of DGM to THg (total mercury) was lower than in the oceans and in the Yellow and Bohai Seas in summer or fall. DGM concentrations in surface water were highest in the central part of the South Yellow Sea and were higher than those in the Bohai Sea, and their spatial distributions were consistent with RHg (reactive mercury). DGM and RHg correlated positively with water temperature in surface seawater (r = 0.506, P < 0.01; r = 0.278, P < 0.05). The concentrations of both DGM and RHg in surface water were controlled by solar radiation and water temperature. Foggy weather did not benefit the production of DGM and RHg. DGM in the bottom seawater was mainly affected by Dissolved Oxygen and water temperature (r = −0.366, P < 0.01; r = 0.331, P < 0.01), produced mainly by anaerobic reactions of the bottom seawater and sediment microorganisms. The bottom DGM concentrations in the Yellow and Bohai Seas were the highest, and DGM produced in bottom seawater and sediment plays a more important role than the surface water in spring. The concentrations of DGM and RHg in the surface and bottom water in the South Yellow Sea were all higher than those in the middle layer. Vertical variations in the North Yellow Sea and the Bohai Sea were small. The production and distribution of DGM and RHg were influenced by differences of latitude and by the Yellow Sea warm current in spring.

show abstract

Section: Influence Of Dgm Concentration In the Bottom Seawatersupporting

confidence: 84%

Section: Dgm In Surface Seawatermentioning

confidence: 96%

Spatial Differences and Influencing Factors of Dissolved Gaseous Mercury in the Yellow Sea and Bohai Sea in Spring

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The physical and environmental characteristics of the Mediterranean Sea have been well described elsewhere (Kotnik et al 2017; Kotnik et al 2014). Briefly, the Mediterranean is a semi-enclosed water body separated from the Atlantic Ocean by the Strait of Gibraltar.…”

Section: Methodsmentioning

confidence: 99%

“…Sample containers were rinsed three times with sample water prior to filling (Horvat et al 1993). Immediately after filling, samples were acidified by HCl (suprapur concentrated HCl; 0.5 mL of HCl per 500 mL of sample) (Kotnik et al 2007; Guevara and Horvat 2013). Adsorption of Hg and its species during storage was checked by spiking at different concentration levels and was insignificant (Guevara and Horvat 2013).…”

Section: Methodsmentioning

confidence: 99%

“…The Mediterranean Sea basin contains extensive geotectonic activity, which jointly with the large deposits of cinnabar in Spain, Italy, and Slovenia and active volcanoes located through the entire region may constitute natural sources of Hg to the basin in addition to anthropogenic sources (mines, chlor-alkali facilities, coal combustion) concentrated along the northern shore (Pirrone et al 2013; Sprovieri et al 2010b; Wängberg et al 2008). Previous oceanographic campaigns performed in the Mediterranean Sea highlight the combination of factors described above, but many have focused on the physical, (photo)chemical, and biological processes governing Hg inputs and cycling particularly regarding abiotic concentrations in the water column (Horvat et al 2003; Kotnik et al 2017; Kotnik et al 2007) or air:sea exchange and atmospheric concentrations (Andersson et al 2007; Fantozzi et al 2013; Sprovieri et al 2010a; Sprovieri et al 2003). Increasing measurements of bioaccumulation particularly in lower trophic levels continues to be a goal (Cinnirella et al 2013).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Spatial and taxonomic variation of mercury concentration in low trophic level fauna from the Mediterranean Sea

et al. 2018

Self Cite

View full text Add to dashboard Cite

Studies of mercury (Hg) in the Mediterranean Sea have focused on pollution sources, air-sea mercury exchange, abiotic mercury cycling, and seafood. Much less is known about methylmercury (MeHg) concentrations in the lower food web. Zooplankton and small fish were sampled from the neuston layer at both coastal and open sea stations in the Mediterranean Sea during three cruise campaigns undertaken in the fall of 2011 and the summers of 2012 and 2013. Zooplankton and small fish were sorted by morphospecies, and the most abundant taxa (e.g. euphausiids, isopods, hyperiid amphipods) analyzed for methylmercury (MeHg) concentration. Unfiltered water samples were taken during the 2011 and 2012 cruises and analyzed for MeHg concentration. Multiple taxa suggested elevated MeHg concentrations in the Tyrrhenian and Balearic Seas in comparison with more eastern and western stations in the Mediterranean Sea. Spatial variation in zooplankton MeHg concentration is positively correlated with single time point whole water MeHg concentration for euphausiids and mysids and negatively correlated with maximum chlorophyll a concentration for euphausiids, mysids, and “smelt” fish. Taxonomic variation in MeHg concentration appears driven by taxonomic grouping and feeding mode. Euphausiids, due to their abundance, relative larger size, importance as a food source for other fauna, and observed relationship with surface water MeHg are a good candidate biotic group to evaluate for use in monitoring the bioavailability of MeHg for trophic transfer in the Mediterranean and potentially globally.

show abstract

A Biogeochemical Approach to Contamination of the Ligurian Sea

Cossa¹,

Fowler²,

Migon³

et al. 2020

The Mediterranean Sea in the Era of Global Change 2

View full text Add to dashboard Cite

Dissolved gaseous mercury (DGM) in the Mediterranean Sea: Spatial and temporal trends

Cited by 22 publications

References 48 publications

Spatial Differences and Influencing Factors of Dissolved Gaseous Mercury in the Yellow Sea and Bohai Sea in Spring

Spatial Differences and Influencing Factors of Dissolved Gaseous Mercury in the Yellow Sea and Bohai Sea in Spring

Spatial and taxonomic variation of mercury concentration in low trophic level fauna from the Mediterranean Sea

A Biogeochemical Approach to Contamination of the Ligurian Sea

Contact Info

Product

Resources

About