Measurement of the Vertical Distribution of Gaseous Elemental Mercury Concentration in Soil Pore Air of Subtropical and Temperate Forests

2021 ◽  
Vol 55 (3) ◽  
pp. 2132-2142
Author(s):  
Jun Zhou ◽  
Zhangwei Wang ◽  
Xiaoshan Zhang ◽  
Charles T. Driscoll
Keyword(s):  
Vertical Distribution ◽  
Mercury Concentration ◽  
Temperate Forests ◽  
Elemental Mercury ◽  
Gaseous Elemental Mercury ◽  
The Vertical Distribution

scholarly journals Multi-model study of mercury dispersion in the atmosphere: Vertical distribution of mercury species

2016 ◽  
Author(s):  
Johannes Bieser ◽  
Franz Slemr ◽  
Jesse Ambrose ◽  
Carl Brenninkmeijer ◽  
Steve Brooks ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Atmospheric Chemistry ◽  
Lower Troposphere ◽  
Elemental Mercury ◽  
Mercury Species ◽  
Substantial Impact ◽  
Model Studies ◽  
Model Study ◽  
The Impact ◽  
The Vertical Distribution

Abstract. Atmospheric chemistry and transport of mercury play a key role in the global mercury cycle. However, there are still considerable knowledge gaps concerning the fate of mercury in the atmosphere. This is the second part of a model inter-comparison study investigating the impact of atmospheric chemistry and emissions on mercury in the atmosphere. While the first study focused on ground based observations of mercury concentration and deposition, here we investigate the vertical distribution and speciation of mercury from the planetary boundary layer to the lower stratosphere. So far, there have been few model studies investigating the vertical distribution of mercury, mostly focusing on single aircraft campaigns. Here, we present a first comprehensive analysis based on various aircraft observations in Europe, North America, and on inter-continental flights. The investigated models proved to be able to reproduce the distribution of total and elemental mercury concentrations in the troposphere including inter-hemispheric trends. One key aspect of the study is the investigation of mercury oxidation in the troposphere. We found that different chemistry schemes were better at reproducing observed oxidized mercury (RM) patterns depending on altitude. High RM concentrations in the upper troposphere could be reproduced with oxidation by bromine while elevated concentrations in the lower troposphere were better reproduced by OH and ozone chemistry. However, the results were not always conclusive as the physical and chemical parametrizations in the chemistry transport models also proved to have a substantial impact on model results.

scholarly journals Vertical distribution of gaseous elemental mercury in Canada

2003 ◽  
Vol 108 (D9) ◽  
pp. n/a-n/a ◽  
Author(s):  
C. M. Banic ◽  
S. T. Beauchamp ◽  
R. J. Tordon ◽  
W. H. Schroeder ◽  
A. Steffen ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Elemental Mercury ◽  
Gaseous Elemental Mercury

Dynamics of gaseous elemental mercury during polar spring and winter

2020 ◽  
Author(s):  
Fidel Pankratov ◽  
Alexander Mahura ◽  
Valentin Popov ◽  
Vladimir Masloboev
Keyword(s):  
Surface Layer ◽  
Solar Activity ◽  
Solar Radiation ◽  
Solar Energy ◽  
Mercury Concentration ◽  
Elemental Mercury ◽  
Ice Cover ◽  
Photochemical Reactions ◽  
High Solar Activity ◽  
Gaseous Elemental Mercury

<p><strong>Dynamics of gaseous elemental mercury during polar spring and winter</strong></p><p>Since June 2001 the long-term monitoring of the gaseous elemental mercury (thereafter, mercury) in the surface layer of the atmospheric has been conducted near the Amderma settlement (69,72<sup>о</sup>N; 61,62<sup>o</sup>E; Yugor Peninsula, Russia).</p><p>During this monitoring, variations of the lowered mercury concentrations (<1.0 ng m<sup>-3</sup>) were observed for spring (March–May) period in 2005 and 2011. For spring 2005, the intensity of the solar radiation did not affect the number of low values of mercury concentrations. With an increase of solar activity during the day there was a reverse effect: i.e. from 9 until 15 h the number of lowered values of concentration decreased. For the evening hours, the highest number of lowered concentrations and atmospheric mercury depletion events, AMDEs (12 events) were observed. For 2005, upon reaching a daily high solar activity the processes of mercury depletion were not observed. It could be because lacking of a large number of marine aerosols in the atmospheric surface layer, although the processes of photochemical reactions did not stop. For spring 2011, during increased solar activity the number of AMDEs increased to 62 events. However, there was no ice cover observed in the coastal area, and consequently, large amounts of sea aerosol could be presented in the surface layer of the atmosphere.</p><p>For the winter (December-January) period, the maximum number (in total, 495) of lowered values of mercury concentration and AMDEs (32 events) were recorded in 2010–2011. Such situation was previously observed only in winter of 2006–2007 (13 events). As there is no direct sunlight in mentioned period, the removal of mercury from the atmosphere may be caused by combination of physical and chemical processes that are not related to photochemistry. Starting mid-January, although duration of the day increases, but solar energy is not enough to activate photochemical reactions and predominant type of solar radiation is diffuse rather than direct one. However, AMDEs were still reported at that time (18 events were registered in January 2011).</p><p>After mid-March, the angle of sun’s declination increases and the incoming solar energy is sufficient to activate photochemistry. However, during March–May there was no linear relationship identified for AMDEs. The maximum number (300) of lowered values of mercury concentration and AMDEs (21 events, with duration up to 66 hours) were registered in April. Such AMDEs are connected with presence of elevated concentrations of aerosols in the absence of ice cover in the marine coastal zone. Not excluded a possibility of contribution of anthropogenic aerosols (from burning of fossil fuels) in the process of mercury deposition from the atmosphere on the underlying surface.</p>

scholarly journals Measurement of Gaseous Elemental Mercury Concentration by Passive Sampler

2017 ◽  
Vol 46 (4) ◽  
pp. 208-214
Author(s):  
Toshihiko MATSUI ◽  
Nobuaki HARAI ◽  
Katsumi SAITOH ◽  
Koyomi NAKAZAWA ◽  
Osamu NAGAFUCHI
Keyword(s):  
Mercury Concentration ◽  
Elemental Mercury ◽  
Passive Sampler ◽  
Gaseous Elemental Mercury

scholarly journals Gaseous elemental mercury concentration in atmosphere at urban and remote sites in China

2007 ◽  
Vol 19 (2) ◽  
pp. 176-180 ◽  
Author(s):  
Zhang-wei WANG ◽  
Zuo-shuai CHEN ◽  
Ning DUAN ◽  
Xiao-shan ZHANG
Keyword(s):  
Mercury Concentration ◽  
Elemental Mercury ◽  
Gaseous Elemental Mercury ◽  
Remote Sites

Oxidation Removal of Elemental Mercury from Flue Gas by K2S2O8

2012 ◽  
Vol 209-211 ◽  
pp. 1549-1552
Author(s):  
Sheng Yu Liu ◽  
Ping Liu ◽  
Li Chao Nengzi ◽  
Wei Qiu ◽  
Cheng Wei Lu
Keyword(s):  
Mercury Concentration ◽  
Flue Gas ◽  
Removal Rate ◽  
Elemental Mercury ◽  
Chemical Form ◽  
Water Soluble ◽  
Mercury Removal ◽  
Reaction Velocity ◽  
Gaseous Elemental Mercury ◽  
Wet Scrubber

The important step for increasing gaseous elemental mercury (Hg0) removal in wet scrubber systems is altering the chemical form of the Hg0to a water-soluble oxidized species. This work focuses on the removal of elemental mercury from simulated flue gas by aqueous K2S2O8in a bubble reactor. In the system of K2S2O8oxidize Hg0, the reaction velocity of K2S2O8and Hg0is soon. Reached a higher removal rate after 10min. Increase the concentration of K2S2O8can remarkably improve the removal rate of Hg0to 85% With the rise of import mercury concentration has increased mercury removal rate to 89.5%.

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