Spatial and temporal variations of total mercury in Antarctic snow along
                        the transect from Zhongshan Station to Dome A

Li, Chuanjin; Kang, Shichang; Shi, Guitao; Huang, Jie; Ding, Minghu; Zhang, Qianggong; Zhang, Lulu; Guo, Junming; Xiao, Cunde; Hou, Shugui; Sun, Bо; Qin, Dahe; Ren, Jiawen

doi:10.3402/tellusb.v66.25152

Cited by 23 publications

(22 citation statements)

References 62 publications

(117 reference statements)

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“…3 in their study). From samples collected during a coast-toinland Antarctic transect (Zhongshan Station-Dome A), Li et al (2014) showed much reduced spatial gradients between sodium and bromine snow concentrations when compared to Simpson and co-workers (Fig. 2 in Li et al, 2014).…”

Section: Introduction: Br Enr As a Potential Indicator Of Past Sea Icmentioning

confidence: 81%

A 120 000-year record of sea ice in the North Atlantic?

et al. 2019

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Abstract. Although it has been demonstrated that the speed and magnitude of the recent Arctic sea ice decline is unprecedented for the past 1450 years, few records are available to provide a paleoclimate context for Arctic sea ice extent. Bromine enrichment in ice cores has been suggested to indicate the extent of newly formed sea ice areas. Despite the similarities among sea ice indicators and ice core bromine enrichment records, uncertainties still exist regarding the quantitative linkages between bromine reactive chemistry and the first-year sea ice surfaces. Here we present a 120 000-year record of bromine enrichment from the RECAP (REnland ice CAP) ice core, coastal east Greenland, and interpret it as a record of first-year sea ice. We compare it to existing sea ice records from marine cores and tentatively reconstruct past sea ice conditions in the North Atlantic as far north as the Fram Strait (50–85∘ N). Our interpretation implies that during the last deglaciation, the transition from multi-year to first-year sea ice started at ∼17.5 ka, synchronously with sea ice reductions observed in the eastern Nordic Seas and with the increase in North Atlantic ocean temperature. First-year sea ice reached its maximum at 12.4–11.8 ka during the Younger Dryas, after which open-water conditions started to dominate, consistent with sea ice records from the eastern Nordic Seas and the North Icelandic shelf. Our results show that over the last 120 000 years, multi-year sea ice extent was greatest during Marine Isotope Stage (MIS) 2 and possibly during MIS 4, with more extended first-year sea ice during MIS 3 and MIS 5. Sea ice extent during the Holocene (MIS 1) has been less than at any time in the last 120 000 years.

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Section: Introduction: Br Enr As a Potential Indicator Of Past Sea Icmentioning

confidence: 81%

A 120 000-year record of sea ice in the North Atlantic?

et al. 2019

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“…Second, the unique clear sky precipitation in interior Antarctica (Dome Argus and Dome Fuji) causes a needle crystal layer to develop on the surface. This layer has higher specific surface areas to better capture dust particulates, hence increasing arsenic concentrations at these sites (Li et al 2014). Arsenic concentrations at Dome Fuji are twice as high as those at Dome Argus, which could be related to the difference in dust deposition between the two sites.…”

Section: Regional Pattern Of Arsenic Concentrations In Antarcticamentioning

confidence: 97%

Arsenic record from a 3 m snow pit at Dome Argus, Antarctica

Hua

Hou

et al. 2016

Antarctic Science

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This study presents an arsenic concentration time series from 1964–2009 at Dome Argus, Antarctica. The data show a very large increase in arsenic concentration from the mid-1980s to the late-1990s (by a factor of~22) compared with the values before the mid-1980s. This increase is likely to be related to the increased copper smelting in South America. Arsenic concentration then decreased in the late-1990s, most probably as a result of environmental regulations in South America. The sudden increase in arsenic concentration observed at Dome Argus coincides with similar increases observed at Dome Fuji and in Antarctica Ice Core-6 (IC-6) at the same time, suggesting that arsenic pollution during the period from the mid-1980s to the late-1990s was a regional phenomenon in Antarctica. Investigations of arsenic concentrations at these three Antarctic locations show that, during this time, regional arsenic distribution followed dust transport pathways associated with general climate models with South America as a major source region for the half of Antarctica facing the Atlantic and Indian oceans.

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“…Over the past decade, field studies have investigated mercury in air and/or snow at a few inland Antarctic stations, i.e., Concordia Station (Dome C, 75 • S, 123 • E), Dome Argus (80 • S, 77 • E), Dome Fuji (77 • S, 40 • E), and the South Pole (90 • S), as well as along several transects on the plateau (Brooks et al, 2008;Dommergue et al, 2012;Han et al, 2014;Li et al, 2014;Angot et al, 2016b, c; Published by Copernicus Publications on behalf of the European Geosciences Union.…”

Section: Introductionmentioning

confidence: 99%

Understanding mercury oxidation and air–snow exchange on the East Antarctic Plateau: a modeling study

et al. 2018

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Abstract. Distinct diurnal and seasonal variations of mercury (Hg) have been observed in near-surface air at Concordia Station on the East Antarctic Plateau, but the processes controlling these characteristics are not well understood. Here, we use a box model to interpret the Hg0 (gaseous elemental mercury) measurements in thes year 2013. The model includes atmospheric Hg0 oxidation (by OH, O3, or bromine), surface snow HgII (oxidized mercury) reduction, and air–snow exchange, and is driven by meteorological fields from a regional climate model. The simulations suggest that a photochemically driven mercury diurnal cycle occurs at the air–snow interface in austral summer. The fast oxidation of Hg0 in summer may be provided by a two-step bromine-initiated scheme, which is favored by low temperature and high nitrogen oxides at Concordia. The summertime diurnal variations of Hg0 (peaking during daytime) may be confined within several tens of meters above the snow surface and affected by changing mixed layer depths. Snow re-emission of Hg0 is mainly driven by photoreduction of snow HgII in summer. Intermittent warming events and a hypothesized reduction of HgII occurring in snow in the dark may be important processes controlling the mercury variations in the non-summer period, although their relative importance is uncertain. The Br-initiated oxidation of Hg0 is expected to be slower at Summit Station in Greenland than at Concordia (due to their difference in temperature and levels of nitrogen oxides and ozone), which may contribute to the observed differences in the summertime diurnal variations of Hg0 between these two polar inland stations.

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Spatial and temporal variations of total mercury in Antarctic snow along the transect from Zhongshan Station to Dome A

Cited by 23 publications

References 62 publications

A 120 000-year record of sea ice in the North Atlantic?

A 120 000-year record of sea ice in the North Atlantic?

Arsenic record from a 3 m snow pit at Dome Argus, Antarctica

Understanding mercury oxidation and air–snow exchange on the East Antarctic Plateau: a modeling study

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