Dissolved iron concentration in the recent snow of the Lambert Glacial Basin, Antarctica

Liu, Ke; Hou, Shugui; Wu, Shuangye; Zhang, Wangbin; Zou, Xiang; Pang, Hongxi; Yu, Jie; Jiang, Xingxing; Wu, Yueyuan

doi:10.1016/j.atmosenv.2018.10.011

Cited by 11 publications

(5 citation statements)

References 52 publications

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“…In addition to Roosevelt Island, there are a few other sites in Antarctica where present day atmospheric iron fluxes have been estimated using similar iron leaching methods in Antarctic snow. Annual dFe and TDFe fluxes at Lambert Glacial Basin, East Antarctica, estimated from a snow pit spanning 2012–2017, are greater than ABN and remarkably similar to Roosevelt Island (dFe: 1.3 × 10 −6 g m −2 y −1 ; TDFe 140 × 10 −6 g m −2 y −1 ); the Lambert Glacial Basin site may also be influenced by local dust sources in East Antarctica (K. Liu et al., 2019). dFe and TDFe fluxes in surface snow along a transect from Zhongshan Station to Dome A in Princess Elizabeth Land, East Antarctica in austral summer 2017 were variable and ranged from 1.6 to 22 × 10 −6 and 2.3 to 110 × 10 −6 g m −2 y −1 respectively (Du et al., 2019).…”

Section: Resultsmentioning

confidence: 99%

“…The second deposition regime is wet deposition of atmospheric iron at land based stations using trace metal clean rain gauges with a hourly temporal resolution (Chance et al., 2015; Heimburger, Losno, & Triquet, 2013). The final is total deposition (wet and dry) in Antarctic snow and ice layers that archive atmospheric dFe over time (Du et al., 2019; Du et al., 2020; Edwards & Sedwick, 2001; K. Liu et al., 2021, 2019; Winton et al., 2014; Winton, Edwards, Delmonte, et al., 2016). The temporal resolution of Antarctic snow pit samples is sub‐annual to annual depending on the snow accumulation rate.…”

Section: Introductionmentioning

confidence: 99%

“…Across Antarctica, remotely sourced mineral dust is considered the background atmospheric dFe source (Du et al., 2019, 2020; Winton, Edwards, Delmonte, et al., 2016). In terms of coastal sites, local mineral dust is an important contributor of dFe in snow as observed at coastal East Antarctica (Gao et al., 2013; K. Liu et al., 2019) and Roosevelt Island (Winton, Edwards, Delmonte, et al., 2016) with McMurdo Sound being the dustiest location in Antarctica (Winton et al., 2014). Biomass burning is an additional dFe source to the Southern Ocean (Tang et al., 2021) and Antarctic coastal snow (Winton, Edwards, Delmonte, et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Conway et al. (2015) demonstrated that both acid leachable iron methods (Gaspari et al., 2006; Vallelonga et al., 2013), to constrain the dFe and total dissolvable iron (TDFe) content (unfiltered, weak acid leachable iron) (Du et al., 2019, 2020; Edwards et al., 2006; K. Liu et al., 2019; Winton, Edwards, Delmonte, et al., 2016), can underestimate the total iron fraction in snow and ice, that is, iron contained within the lattice of highly refractory aluminosilicate particles. However, most of the iron contained within Antarctic snow and ice is rendered soluble under mildly acidic conditions (Edwards & Sedwick, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Deposition of Atmospheric Soluble Iron by Intrusions of Marine Air Masses to East Antarctica

Winton

Moy

2022

JGR Atmospheres

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Bio‐essential iron can relieve nutrient limitation and stimulate marine productivity in the Southern Ocean. The fractional iron solubility of aerosol iron is an important variable determining iron availability for biological uptake. However, estimates of dissolved iron (dFe; iron < 0.2 μm) and the factors driving the variability of fractional iron solubility in pristine air masses are largely unquantified. To constrain inputs of fractional iron solubility to remote East Antarctic waters, dFe, total dissolvable iron (TDFe), trace elements and refractory black carbon were analyzed in a 9‐year‐old snow pit (2005–2014) from a new ice core site at Aurora Basin North (ABN) in Wilkes Land, East Antarctica. Extremely low annual dFe deposition fluxes were estimated (0.2 × 10−6 g m−2 y−1), while annual TDFe deposition fluxes (70 × 10−6 g m−2 y−1) were comparable to other Antarctic sites. TDFe is dominantly sourced from mineral dust. Unlike coastal Antarctic sites where the variability of fractional iron solubility in modern snow is explained by a mixture of dust and biomass burning sources, dFe deposition and fractional iron solubility at ABN (ranging between 0.1% and 6%) is enhanced in episodic high precipitation events from synoptic warm air masses. Enhanced fractional iron solubility reaching the high elevation site at ABN is suggested through the mechanism of cloud processing of background mineral dust that modifies the dust chemistry and increases iron dissolution during long‐range transport. This study highlights a complex interplay of sources and processes that drive fractional iron solubility in pristine air masses.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Deposition of Atmospheric Soluble Iron by Intrusions of Marine Air Masses to East Antarctica

Winton

Moy

2022

JGR Atmospheres

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“…Total labile Fe flux in summer, derived from snow samples at Roosevelt Island in Ross Sea, was 39 μg m −2 year −1 (Winton et al, 2016), ~12 times higher than the average dry flux of ∑ Fe L from this study (Table 3), likely deriving from local dust sources in Marie Byrd Land or Victoria Land (Bhattachan et al, 2015) and the contribution of wet deposition. Snow samples from Lambert Glacial Basin in East Antarctica gave an average total labile Fe flux of 140 μg m −2 year −1 (Liu et al, 2019). Ice core studies also revealed deposition of labile Fe at a few locations over Antarctica.…”

Section: Resultsmentioning

confidence: 99%

Particle‐Size Distributions and Solubility of Aerosol Iron Over the Antarctic Peninsula During Austral Summer

et al. 2020

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This study provides new data on the properties of aerosol iron (Fe) over the Antarctic Peninsula, one of the fastest warming regions on Earth in recent decades. Atmospheric deposition delivers Fe, a limiting micronutrient, to the Southern Ocean, and aerosol particle size influences the air‐to‐sea deposition rate and fractional solubility of aerosol Fe. Size‐segregated aerosols were collected at Palmer Station on the West Antarctic Peninsula during austral summer 2016–2017. Results show single‐mode size distribution of aerosol Fe, peaking at 4.4 μm diameter. The average concentration of total aerosol Fe was 1.3 (±0.40) ng m−3 (range 0.74–1.8 ng m−3). High concentrations of total aerosol Fe occurred in January, implying increased Fe source strength then. Total labile Fe varied between 0.019 and 0.095 ng m−3, and labile Fe (II) accounted for ~90% of the total labile Fe. The average fractional solubility for total Fe was 3.8% (±1.5%) (range 2.5–7.3%). Estimated dry deposition fluxes for the study period were 3.2 μg m−2 year−1 for total labile Fe and 83 μg m−2 year−1 for total Fe in aerosols. We speculate that local and regional dust sources in Antarctica contributed to the observed aerosol Fe in austral summer and that warming on the Antarctic Peninsula during the past half century may have increased the formation of dust sources in this region. The potential biogeochemical impact of atmospheric Fe input to the West Antarctic Peninsula shelf waters and adjacent pelagic surface waters of the Southern Ocean may need to be re‐evaluated.

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Sources and distribution of trace elements in surface snow from coastal Zhongshan Station to Dome A (East Antarctica)

Herath,

Ma,

Bargagli

et al. 2024

Atmospheric Environment

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Dissolved iron concentration in the recent snow of the Lambert Glacial Basin, Antarctica

Cited by 11 publications

References 52 publications

Enhanced Deposition of Atmospheric Soluble Iron by Intrusions of Marine Air Masses to East Antarctica

Enhanced Deposition of Atmospheric Soluble Iron by Intrusions of Marine Air Masses to East Antarctica

Particle‐Size Distributions and Solubility of Aerosol Iron Over the Antarctic Peninsula During Austral Summer

Sources and distribution of trace elements in surface snow from coastal Zhongshan Station to Dome A (East Antarctica)

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