Fluxes of Gaseous Elemental Mercury at a Mediterranean Coastal Grassland

Polyzou, Christiana; Loupa, Glykeria; Trepekli, Katerina; Rapsomanikis, S.

doi:10.20944/preprints201908.0157.v1

Cited by 3 publications

(1 citation statement)

References 36 publications

(44 reference statements)

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“…The meteorological data, such as temperature, humidity, wind velocity, wind direction, and barometric pressure, were measured at 1 Hz in the same site, as described in the previous studies [27,32]. The additional meteorological data were provided by the Hellenic National Meteorological Service (HNMS).…”

Section: Sampling Instrumentationmentioning

confidence: 99%

Concentrations of Gaseous Elemental Mercury in the Atmosphere of a Mediterranean Coastal Site in Greece

Polyzou¹,

Loupa²,

Rapsomanikis³

2021

aeer

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Gaseous elemental mercury (GEM) was monitored in the atmosphere of a coastal site situated in the Northern Aegean Sea of Greece from August 2014 to January 2015. The selected sampling site is seldom impacted by human activities. Thus, it was possible to study the processes involved in natural terrestrial, aquatic, and atmospheric environments. The diurnal and monthly variations in the concentration of GEM as well as the factors influencing these variations were determined. The GEM concentrations were found to be in the range from 0.63 to 4.44 ng m–3 during data acquisition. The mean GEM concentration was about 1.04 ±0.30 ng m–3. Higher concentrations and variability were observed during the summer than in fall and winter. In addition, increased GEM concentrations were measured during midday. The diurnal and monthly variations in GEMwere possibly affected by solar radiation, temperature, vegetation, and boundary layer height. Various peaks were observed for air masses of terrestrial origin, possibly due to the small extent of biomass burning as well as rainfall. The background concentrations of GEM in the studied coastal site were around 1.50 ng m–3. The sampling site is a complex environment as this coastal region has seasonal surface water in the mainland and extended areas of grassland and vegetated surfaces. All individual parameters of this area play significant roles in determining GEM concentrations.

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Section: Sampling Instrumentationmentioning

confidence: 99%

Concentrations of Gaseous Elemental Mercury in the Atmosphere of a Mediterranean Coastal Site in Greece

Polyzou¹,

Loupa²,

Rapsomanikis³

2021

aeer

Self Cite

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Air Concentrations of Gaseous Elemental Mercury and Vegetation–Air Fluxes within Saltmarshes of the Tagus Estuary, Portugal

et al. 2021

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In situ air concentrations of gaseous elemental mercury (Hg(0)) and vegetation–atmosphere fluxes were quantified in both high (Cala Norte, CN) and low-to-moderate (Alcochete, ALC) Hg-contaminated saltmarsh areas of the Tagus estuary colonized by plant species Halimione portulacoides (Hp) and Sarcocornia fruticosa (Sf). Atmospheric Hg(0) ranged between 1.08–18.15 ng m−3 in CN and 1.18–3.53 ng m−3 in ALC. In CN, most of the high Hg(0) levels occurred during nighttime, while the opposite was observed at ALC, suggesting that photoreduction was not driving the air Hg(0) concentrations at the contaminated site. Vegetation–air Hg(0) fluxes were low in ALC and ranged from −0.76 to 1.52 ng m−2 (leaf area) h−1 for Hp and from −0.40 to 1.28 ng m−2 (leaf area) h−1 for Sf. In CN, higher Hg fluxes were observed for both plants, ranging from −9.90 to 15.45 ng m−2 (leaf area) h−1 for Hp and from −8.93 to 12.58 ng m−2 (leaf area) h−1 for Sf. Mercury flux results at CN were considered less reliable due to large and fast variations in the ambient air concentrations of Hg(0), which may have been influenced by emissions from the nearby chlor-alkali plant, or historical contamination. Improved experimental setup, the influence of high local Hg concentrations and the seasonal activity of the plants must be considered when assessing vegetation–air Hg(0) fluxes in Hg-contaminated areas.

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Characteristics of Mercury Fluxes between Soil and Air in the Farming-Pastoral Ecotone of Songnen Grassland

Sun

Zhang

et al. 2023

Sustainability

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In order to understand the characteristics and influencing factors of surface release fluxes in the typical agro-pastoral mosaic region of the Songnen grasslands of northern China, this study selected two sample plots to, respectively, represent the L. chinensis covered grassland (L), and the Z. mays covered fields (Z) in the Waizi area of Changling County, with western Jilin Province as the study area. This study investigated the atmospheric mercury (Total Gaseous Mercury (TGM)) concentrations, surface soil mercury concentrations, the gaseous elemental mercury exchange fluxes, and related environmental factors. The results showed that the TGM concentrations in two sample plots in the study area were basically the same during the summer and autumn months, but were higher in summer than in autumn, and there was a clear diurnal pattern. The average mercury concentrations in the surface soil were also higher in summer than in autumn. Furthermore, the surface soil has a clear mercury release process, and the mercury release were higher in the sheep grass field than the maize field during the same season. The mercury release fluxes in each site within the ecotone were related to the solar radiation and soil temperature values, and the effects of them on the soil mercury release were independent from one another.

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Fluxes of Gaseous Elemental Mercury at a Mediterranean Coastal Grassland

Cited by 3 publications

References 36 publications

Concentrations of Gaseous Elemental Mercury in the Atmosphere of a Mediterranean Coastal Site in Greece

Concentrations of Gaseous Elemental Mercury in the Atmosphere of a Mediterranean Coastal Site in Greece

Air Concentrations of Gaseous Elemental Mercury and Vegetation–Air Fluxes within Saltmarshes of the Tagus Estuary, Portugal

Characteristics of Mercury Fluxes between Soil and Air in the Farming-Pastoral Ecotone of Songnen Grassland

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