Fate of Springtime Atmospheric Reactive Mercury: Concentrations and Deposition at Zeppelin, Svalbard
Fate of Springtime Atmospheric Reactive Mercury: Concentrations and Deposition at Zeppelin, Svalbard
复制标题
春季大气活性汞的命运:斯瓦尔巴齐柏林飞艇的浓度和沉积
DOI:
10.1021/acsearthspacechem.1c00299
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发表时间:
2021
影响因子:
3.4
通讯作者:
Huang, Jiaoyan
中科院分区:
文献类型:
--
作者:
Osterwalder, Stefan;Dunham-Cheatham, Sarrah M.;Ferreira Araujo, Beatriz;Magand, Olivier;Thomas, Jennie L.;Baladima, Foteini;Pfaffhuber, Katrine Aspmo;Berg, Torunn;Zhang, Lei;Huang, Jiaoyan
Mid-latitude atmospheric elemental mercury (Hg) emissions undergo extensive oxidation to reactive Hg (RM) compounds during Arctic polar sunrise, resulting in enhanced atmospheric deposition that impacts Arctic marine wildlife and humans. It has been difficult to estimate RM dry deposition, because RM concentrations, compounds, and their deposition velocities are ill-defined. Here, we investigate RM concentrations sampled with membrane-based methods and find these to exceed denuder-based RM detection by 5 times at the Zeppelin Observatory on Svalbard (March 26–July 24, 2019). Measured dry deposition of gaseous oxidized Hg was about half of the modeled RM deposition, demonstrating that particulate-bound Hg was an important component of dry deposition. Using thermal membrane desorption, RM chemistry was found to be dominated by Hg–Cl/Br (51%) and Hg–N (45%) compounds. Back-trajectory analysis indicated that Hg–Br/Cl compounds were predominantly advected from within the marine boundary layer (sea ice exposure), while Hg–N originated from the free troposphere. Weekly average RM compound-specific dry deposition velocities ranged from 0.12 to 0.49 cm s–1, with a net RM dry deposition of 1.9 μg m–2(1.5–2.5 μg m–2; 95% confidence interval) that exceeds the mean annual Hg wet deposition flux in Svalbard. Overall, we find that springtime atmospheric RM deposition has been underestimated in the Arctic marine environment.
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DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
F. Sprovieri;N. Pirrone;M. Landis;R. Stevens
通讯作者:
R. Stevens
影响因子:
5
作者:
Dunham-Cheatham, Sarrah M.;Lyman, Seth;Gustin, Mae Sexauer
通讯作者:
Gustin, Mae Sexauer
影响因子:
5.2
作者:
Soerensen, Anne L.;Jacob, Daniel J.;Sunderland, Elsie M.
通讯作者:
Sunderland, Elsie M.
影响因子:
4.9
作者:
Jiskra, Martin;Sonke, Jeroen E.;Obrist, Daniel
通讯作者:
Obrist, Daniel
影响因子:
11.4
作者:
F. Sprovieri;N. Pirrone;M. Landis;R. Stevens
通讯作者:
F. Sprovieri;N. Pirrone;M. Landis;R. Stevens