Articles | Volume 15, issue 2
https://doi.org/10.5194/tc-15-1087-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-15-1087-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
01 Mar 2021
Research article |
| 01 Mar 2021
| 01 Mar 2021
Brief communication: Spatial and temporal variations in surface snow chemistry along a traverse from coastal East Antarctica to the ice sheet summit (Dome A)
Key Laboratory of Geographic Information Science (Ministry of
Education), School of Geographic Sciences and State Key Laboratory of Estuarine and
Coastal Research, East China Normal University, Shanghai 200241, China
Polar Research Institute of China, Shanghai 200062, China
Hongmei Ma
Polar Research Institute of China, Shanghai 200062, China
Zhengyi Hu
Polar Research Institute of China, Shanghai 200062, China
Zhenlou Chen
Key Laboratory of Geographic Information Science (Ministry of
Education), School of Geographic Sciences and State Key Laboratory of Estuarine and
Coastal Research, East China Normal University, Shanghai 200241, China
Chunlei An
Polar Research Institute of China, Shanghai 200062, China
Su Jiang
Polar Research Institute of China, Shanghai 200062, China
Yuansheng Li
Polar Research Institute of China, Shanghai 200062, China
Tianming Ma
Polar Research Institute of China, Shanghai 200062, China
Jinhai Yu
Polar Research Institute of China, Shanghai 200062, China
Danhe Wang
Key Laboratory of Geographic Information Science (Ministry of
Education), School of Geographic Sciences and State Key Laboratory of Estuarine and
Coastal Research, East China Normal University, Shanghai 200241, China
Siyu Lu
Polar Research Institute of China, Shanghai 200062, China
Bo Sun
Polar Research Institute of China, Shanghai 200062, China
Meredith G. Hastings
Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, Rhode Island 02912, USA
Institute at Brown for Environment and Society, Brown University,
Providence, Rhode Island 02912, USA
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X. Cui, J. Guo, L. Li, X. Tang, and B. Sun
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J. Guo, K. Wang, Z. Zeng, L. Li, J. Liu, X. Tang, X. Cui, Y. Wang, B. Sun, and J. Zhang
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Jiajue Chai, David J. Miller, Eric Scheuer, Jack Dibb, Vanessa Selimovic, Robert Yokelson, Kyle J. Zarzana, Steven S. Brown, Abigail R. Koss, Carsten Warneke, and Meredith Hastings
Atmos. Meas. Tech., 12, 6303–6317, https://doi.org/10.5194/amt-12-6303-2019, https://doi.org/10.5194/amt-12-6303-2019, 2019
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Liyun Zhao, John C. Moore, Bo Sun, Xueyuan Tang, and Xiaoran Guo
The Cryosphere, 12, 1651–1663, https://doi.org/10.5194/tc-12-1651-2018, https://doi.org/10.5194/tc-12-1651-2018, 2018
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We investigate the age–depth profile to be expected of the ongoing deep ice coring at Kunlun station, Dome A, using the depth-varying anisotropic fabric suggested by the recent polarimetric measurements in a three-dimensional, thermo-mechanically coupled full-Stokes model. The model results suggest that the age of the deep ice at Kunlun is 649–831 ka, and there are large regions where 1-million-year-old ice may be found 200 m above the bedrock within 5–6 km of the Kunlun station.
Guitao Shi, Meredith G. Hastings, Jinhai Yu, Tianming Ma, Zhengyi Hu, Chunlei An, Chuanjin Li, Hongmei Ma, Su Jiang, and Yuansheng Li
The Cryosphere, 12, 1177–1194, https://doi.org/10.5194/tc-12-1177-2018, https://doi.org/10.5194/tc-12-1177-2018, 2018
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The deposition and preservation of NO3− across East Antarctica was investigated. On the coast, dry deposition contributes 27–44 % of the NO3− fluxes, and the linear relationship between NO3− and snow accumulation rate suggests a homogeneity of atmospheric NO3− levels. In inland snow, a relatively weak correlation between NO3− and snow accumulation was found, indicating that NO3− is mainly dominated by post-depositional processes. The coexisting ions are generally less influential on snow NO3−.
Nathan J. Chellman, Meredith G. Hastings, and Joseph R. McConnell
The Cryosphere Discuss., https://doi.org/10.5194/tc-2016-163, https://doi.org/10.5194/tc-2016-163, 2016
Revised manuscript not accepted
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This manuscript analyzes the changing sources of nitrate deposition to Greenland since 1760 CE using a dataset consisting of sub-seasonally resolved nitrogen isotopes of nitrate and source tracers. Correlations amongst ion concentration, source tracers, and the δ15N–NO3− provide evidence of the impact of biomass burning and fossil fuel combustion emissions of nitrogen oxides and suggest that oil combustion is the likely driver of increased nitrate concentration in Greenland ice since 1940 CE.
G. Shi, A. M. Buffen, M. G. Hastings, C. Li, H. Ma, Y. Li, B. Sun, C. An, and S. Jiang
Atmos. Chem. Phys., 15, 9435–9453, https://doi.org/10.5194/acp-15-9435-2015, https://doi.org/10.5194/acp-15-9435-2015, 2015
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We evaluate isotopic composition of NO3- in different environments across East Antarctica. At high snow accumulation sites, isotopic ratios are suggestive of preservation of NO3- deposition. At low accumulation sites, isotopes are sensitive to both the loss of NO3- due to photolysis and secondary formation of NO3- within the snow. The imprint of post-depositional alteration is not uniform with depth, making it difficult to predict the isotopic composition at depth from near-surface data alone.
E. D. Sofen, B. Alexander, E. J. Steig, M. H. Thiemens, S. A. Kunasek, H. M. Amos, A. J. Schauer, M. G. Hastings, J. Bautista, T. L. Jackson, L. E. Vogel, J. R. McConnell, D. R. Pasteris, and E. S. Saltzman
Atmos. Chem. Phys., 14, 5749–5769, https://doi.org/10.5194/acp-14-5749-2014, https://doi.org/10.5194/acp-14-5749-2014, 2014
Related subject area
Discipline: Snow | Subject: Snow Chemistry
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The paper presents the first ice-core record of bromine (Br) in the Antarctic plateau. By the observation of the ice core and the application of atmospheric chemical models, we investigate the behaviour of bromine after its deposition into the snowpack, with interest in the effect of UV radiation change connected to the formation of the ozone hole, the role of volcanic deposition, and the possible use of Br to reconstruct past sea ice changes from ice core collect in the inner Antarctic plateau.
Zhuang Jiang, Joel Savarino, Becky Alexander, Joseph Erbland, Jean-Luc Jaffrezo, and Lei Geng
The Cryosphere, 16, 2709–2724, https://doi.org/10.5194/tc-16-2709-2022, https://doi.org/10.5194/tc-16-2709-2022, 2022
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A record of year-round atmospheric nitrate isotopic composition along with snow nitrate isotopic data from Summit, Greenland, revealed apparent enrichments in nitrogen isotopes in snow nitrate compared to atmospheric nitrate, in addition to a relatively smaller degree of changes in oxygen isotopes. The results suggest that at this site post-depositional processing takes effect, which should be taken into account when interpreting ice-core nitrate isotope records.
Yuying Chen, Keshao Liu, Yongqin Liu, Trista J. Vick-Majors, Feng Wang, and Mukan Ji
The Cryosphere, 16, 1265–1280, https://doi.org/10.5194/tc-16-1265-2022, https://doi.org/10.5194/tc-16-1265-2022, 2022
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We investigated the bacterial communities in surface and subsurface snow samples in a Tibetan Plateau glacier using 16S rRNA gene sequences. Our results revealed rapid temporal changes in nitrogen (including nitrate and ammonium) and bacterial communities in both surface and subsurface snow. These findings advance our understanding of bacterial community variations and bacterial interactions after snow deposition and provide a possible biological explanation for nitrogen dynamics in snow.
Zhuang Jiang, Becky Alexander, Joel Savarino, Joseph Erbland, and Lei Geng
The Cryosphere, 15, 4207–4220, https://doi.org/10.5194/tc-15-4207-2021, https://doi.org/10.5194/tc-15-4207-2021, 2021
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We used a snow photochemistry model (TRANSITS) to simulate the seasonal nitrate snow profile at Summit, Greenland. Comparisons between model outputs and observations suggest that at Summit post-depositional processing is active and probably dominates the snowpack δ15N seasonality. We also used the model to assess the degree of snow nitrate loss and the consequences in its isotopes at present and in the past, which helps for quantitative interpretations of ice-core nitrate records.
Tingfeng Dou, Zhiheng Du, Shutong Li, Yulan Zhang, Qi Zhang, Mingju Hao, Chuanjin Li, Biao Tian, Minghu Ding, and Cunde Xiao
The Cryosphere, 13, 3309–3316, https://doi.org/10.5194/tc-13-3309-2019, https://doi.org/10.5194/tc-13-3309-2019, 2019
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The meltwater scavenging coefficient (MSC) determines the BC enrichment in the surface layer of melting snow and therefore modulates the BC-snow-albedo feedbacks. This study presents a new method for MSC estimation over the sea-ice area in Arctic. Using this new method, we analyze the spatial variability of MSC in the western Arctic and demonstrate that the value in Canada Basin (23.6 % ± 2.1 %) ≈ that in Greenland (23.0 % ± 12.5 %) > that in Chukchi Sea (17.9 % ± 5.0 %) > that in Elson Lagoon (14.5 % ± 2.6 %).
Xin Wang, Hailun Wei, Jun Liu, Baiqing Xu, Mo Wang, Mingxia Ji, and Hongchun Jin
The Cryosphere, 13, 309–324, https://doi.org/10.5194/tc-13-309-2019, https://doi.org/10.5194/tc-13-309-2019, 2019
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A large survey on measuring optical and chemical properties of insoluble light-absorbing impurities (ILAPs) from seven glaciers was conducted on the Tibetan Plateau (TP) during 2013–2015. The results indicated that the mixing ratios of black carbon (BC), organic carbon (OC), and iron (Fe) all showed a tendency to decrease from north to south, and the industrial pollution (33.1 %), biomass and biofuel burning (29.4 %), and soil dust (37.5 %) were the major sources of the ILAPs on the TP.
Yannick Agnan, Thomas A. Douglas, Detlev Helmig, Jacques Hueber, and Daniel Obrist
The Cryosphere, 12, 1939–1956, https://doi.org/10.5194/tc-12-1939-2018, https://doi.org/10.5194/tc-12-1939-2018, 2018
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In this study, we investigated mercury dynamics in an interior arctic tundra at Toolik Field Station (200 km from the Arctic Ocean) during two full snow seasons. We continuously measured atmospheric, snow gas phase, and soil pores mercury concentrations. We observed consistent concentration declines from the atmosphere to snowpack to soils, indicating that soils are continuous sinks of mercury. We suggest that interior arctic snowpacks may be negligible sources of mercury.
Carmen Paulina Vega, Elisabeth Isaksson, Elisabeth Schlosser, Dmitry Divine, Tõnu Martma, Robert Mulvaney, Anja Eichler, and Margit Schwikowski-Gigar
The Cryosphere, 12, 1681–1697, https://doi.org/10.5194/tc-12-1681-2018, https://doi.org/10.5194/tc-12-1681-2018, 2018
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Ions were measured in firn and ice cores from Fimbul Ice Shelf, Antarctica, to evaluate sea-salt loads. A significant sixfold increase in sea salts was found in the S100 core after 1950s which suggests that it contains a more local sea-salt signal, dominated by processes during sea-ice formation in the neighbouring waters. In contrast, firn cores from three ice rises register the larger-scale signal of atmospheric flow conditions and transport of sea-salt aerosols produced over open water.
Cited articles
Bertler, N., Mayewski, P. A., Aristarain, A., Barrett, P., Becagli, S.,
Bernardo, R., Bo, S., Xiao, C., Curran, M., and Qin, D.: Snow chemistry
across Antarctica, Ann. Glaciol., 41, 167–179, 2005.
Bondietti, E. A. and Papastefanou, C.: Estimates of residence times of
sulfate aerosols in ambient air, Sci. Total Environ., 136, 25–31,
https://doi.org/10.1016/0048-9697(93)90294-G, 1993.
Ding, M., Xiao, C., Li, Y., Ren, J., Hou, S., Jin, B., and Sun, B.: Spatial
variability of surface mass balance along a traverse route from Zhongshan
station to Dome A, Antarctica, J. Glaciol., 57, 658–666, 2011.
Dixon, D. A., Mayewski, P. A., Korotkikh, E., Sneed, S. B., Handley, M. J., Introne, D. S., and Scambos, T. A.: Variations in snow and firn chemistry along US ITASE traverses and the effect of surface glazing, The Cryosphere, 7, 515–535, https://doi.org/10.5194/tc-7-515-2013, 2013.
Du, Z., Xiao, C., Ding, M., and Li, C.: Identification of multiple natural
and anthropogenic sources of dust in snow from Zhongshan Station to Dome A,
East Antarctica, J. Glaciol., 64, 855–865, https://doi.org/10.1017/jog.2018.72, 2018.
Du, Z., Xiao, C., Handley, M. J., Mayewski, P. A., Li, C., Liu, S., Ma, X.,
and Yang, J.: Fe variation characteristics and sources in snow samples along
a traverse from Zhongshan Station to Dome A, East Antarctica, Sci. Total
Environ., 675, 380–389, https://doi.org/10.1016/j.scitotenv.2019.04.139, 2019.
Finlayson-Pitts, B. J.: The tropospheric chemistry of sea salt: a
molecular-level view of the chemistry of NaCl and NaBr, Chem. Rev., 103,
4801–4822, 2003.
Gragnani, R., Smiraglia, C., Stenni, B., and Torcini, S.: Chemical and
isotopic profiles from snow pits and shallow firn cores on Campbell Glacier,
northern Victoria Land, Antarctica, Ann. Glaciol., 27, 679–684, 1998.
Hara, K., Osada, K., and Yamanouchi, T.: Tethered balloon-borne aerosol measurements: seasonal and vertical variations of aerosol constituents over Syowa Station, Antarctica, Atmos. Chem. Phys., 13, 9119–9139, https://doi.org/10.5194/acp-13-9119-2013, 2013.
Hara, K., Nakazawa, F., Fujita, S., Fukui, K., Enomoto, H., and Sugiyama, S.: Horizontal distributions of aerosol constituents and their mixing states in Antarctica during the JASE traverse, Atmos. Chem. Phys., 14, 10211–10230, https://doi.org/10.5194/acp-14-10211-2014, 2014.
Hou, S., Li, Y., Xiao, C., and Ren, J.: Recent accumulation rate at Dome A,
Antarctica, Chin. Sci. Bull., 52, 428–431, 2007.
Keene, W. C., Maring, H., Maben, J. R., Kieber, D. J., Pszenny, A. A., Dahl,
E. E., Izaguirre, M. A., Davis, A. J., Long, M. S., and Zhou, X.: Chemical and
physical characteristics of nascent aerosols produced by bursting bubbles at
a model air-sea interface, J. Geophys. Res., 112, D21202,
https://doi.org/10.1029/2007JD008464, 2007.
Khodzher, T. V., Golobokova, L. P., Osipov, E. Yu., Shibaev, Yu. A., Lipenkov, V. Ya., Osipova, O. P., and Petit, J. R.: Spatial–temporal dynamics of chemical composition of surface snow in East Antarctica along the Progress station–Vostok station transect, The Cryosphere, 8, 931–939, https://doi.org/10.5194/tc-8-931-2014, 2014.
Legrand, M.: Chemistry of Antarctic snow and ice, J. de Phys., 48, 77–86,
1987.
Legrand, M. and Delmas, R. J.: Spatial and temporal variations of snow
chemistry in Terre Adélie (East Antarctica), Ann. Glaciol., 7, 20–25,
1985.
Legrand, M., Yang, X., Preunkert, S., and Theys, N.: Year-round records of
sea salt, gaseous, and particulate inorganic bromine in the atmospheric
boundary layer at coastal (Dumont d'Urville) and central (Concordia) East
Antarctic sites, J. Geophys. Res., 121, 2015JD024066,
https://doi.org/10.1002/2015JD024066, 2016.
Legrand, M., Preunkert, S., Weller, R., Zipf, L., Elsässer, C., Merchel, S., Rugel, G., and Wagenbach, D.: Year-round record of bulk and size-segregated aerosol composition in central Antarctica (Concordia site) – Part 2: Biogenic sulfur (sulfate and methanesulfonate) aerosol, Atmos. Chem. Phys., 17, 14055–14073, https://doi.org/10.5194/acp-17-14055-2017, 2017a.
Legrand, M., Preunkert, S., Wolff, E., Weller, R., Jourdain, B., and Wagenbach, D.: Year-round records of bulk and size-segregated aerosol composition in central Antarctica (Concordia site) – Part 1: Fractionation of sea-salt particles, Atmos. Chem. Phys., 17, 14039–14054, https://doi.org/10.5194/acp-17-14039-2017, 2017b.
Li, C., Xiao, C., Shi, G., Ding, M., Qin, D., and Ren, J.: Spatial and
temporal variability of marine-origin matter along a transect from Zhongshan
Station to Dome A, Eastern Antarctica, J. Environ. Sci., 46, 190–202,
https://doi.org/10.1016/j.jes.2015.07.011, 2016.
Marion, G., Farren, R., and Komrowski, A.: Alternative pathways for seawater
freezing, Cold Reg. Sci. Technol., 29, 259–266, 1999.
Mayewski, P. A., Carleton, A. M., Birkel, S. D., Dixon, D., Kurbatov, A. V.,
Korotkikh, E., McConnell, J., Curran, M., Cole-Dai, J., Jiang, S., Plummer,
C., Vance, T., Maasch, K. A., Sneed, S. B., and Handley, M.: Ice core and
climate reanalysis analogs to predict Antarctic and Southern Hemisphere
climate changes, Quaternary Sci. Rev., 155, 50–66,
https://doi.org/10.1016/j.quascirev.2016.11.017, 2017.
Mulvaney, R. and Wolff, E.: Spatial variability of the major chemistry of
the Antarctic ice sheet, Ann. Glaciol., 20, 440–447, 1994.
Neubauer, J. and Heumann, K. G.: Nitrate trace determinations in snow and
firn core samples of ice shelves at the Weddell Sea, Antarctica, Atmos.
Environ., 22, 537–545, 1988.
Proposito, M., Becagli, S., Castellano, E., Flora, O., Genoni, L., Gragnani,
R., Stenni, B., Traversi, R., Udisti, R., and Frezzotti, M.: Chemical and
isotopic snow variability along the 1998 ITASE traverse from Terra Nova Bay
to Dome C, East Antarctica, Ann. Glaciol., 35, 187–194, 2002.
Qin, D., Zeller, E. J., and Dreschhoff, G. A.: The distribution of nitrate
content in the surface snow of the Antarctic Ice Sheet along the route of
the 1990 International Trans-Antarctica Expedition, J. Geophys. Res., 97,
6277–6284, 1992.
Rankin, A. M. and Wolff, E. W.: Ammonium and potassium in snow around an
emperor penguin colony, Antarct. Sci., 12, 154–159,
https://doi.org/10.1017/S0954102000000201, 2000.
Russell, A. and McGregor, G. R.: Southern hemisphere atmospheric
circulation: impacts on Antarctic climate and reconstructions from Antarctic
ice core data, Climatic Change, 99, 155–192, 2010.
Savarino, J., Kaiser, J., Morin, S., Sigman, D. M., and Thiemens, M. H.: Nitrogen and oxygen isotopic constraints on the origin of atmospheric nitrate in coastal Antarctica, Atmos. Chem. Phys., 7, 1925–1945, https://doi.org/10.5194/acp-7-1925-2007, 2007.
Severi, M., Becagli, S., Castellano, E., Morganti, A., Traversi, R., and
Udisti, R.: Thirty years of snow deposition at Talos Dome (Northern Victoria
Land, East Antarctica): Chemical profiles and climatic implications,
Microchem. J., 92, 15–20, https://doi.org/10.1016/j.microc.2008.08.004,
2009.
Shi, G.: Data set to: Surface snow chemistry data along a traverse from
coastal East Antarctica to the ice sheet summit, Dome A, Data-sharing
Platform of Polar Science, National Arctic and Antarctic Data Center,
https://doi.org/10.11856/SNS.D.2021.003.v0, 2021.
Shi, G., Li, Y., Jiang, S., An, C., Ma, H., Sun, B., and Wang, Y.:
Large-scale spatial variability of major ions in the atmospheric wet
deposition along the China Antarctica transect (31∘N–69∘S), Tellus B, 64, 17134, https://doi.org/10.3402/tellusb.v64i0.17134, 2012.
Shi, G., Buffen, A. M., Hastings, M. G., Li, C., Ma, H., Li, Y., Sun, B., An, C., and Jiang, S.: Investigation of post-depositional processing of nitrate in East Antarctic snow: isotopic constraints on photolytic loss, re-oxidation, and source inputs, Atmos. Chem. Phys., 15, 9435–9453, https://doi.org/10.5194/acp-15-9435-2015, 2015.
Shi, G., Buffen, A. M., Ma, H., Hu, Z., Sun, B., Li, C., Yu, J., Ma, T., An,
C., Jiang, S., Li, Y., and Hastings, M. G.: Distinguishing summertime
atmospheric production of nitrate across the East Antarctic Ice Sheet,
Geochim. Cosmochim. Ac., 231, 1–14, https://doi.org/10.1016/j.gca.2018.03.025, 2018.
Sigl, M., Fudge, T. J., Winstrup, M., Cole-Dai, J., Ferris, D., McConnell, J. R., Taylor, K. C., Welten, K. C., Woodruff, T. E., Adolphi, F., Bisiaux, M., Brook, E. J., Buizert, C., Caffee, M. W., Dunbar, N. W., Edwards, R., Geng, L., Iverson, N., Koffman, B., Layman, L., Maselli, O. J., McGwire, K., Muscheler, R., Nishiizumi, K., Pasteris, D. R., Rhodes, R. H., and Sowers, T. A.: The WAIS Divide deep ice core WD2014 chronology – Part 2: Annual-layer counting (0–31 ka BP), Clim. Past, 12, 769–786, https://doi.org/10.5194/cp-12-769-2016, 2016.
Suzuki, T., Iizuka, Y., Matsuoka, K., Furukawa, T., Kamiyama, K., and
Watanabe, O.: Distribution of sea salt components in snow cover along the
traverse route from the coast to Dome Fuji station 1000km inland at east
Dronning Maud Land, Antarctica, Tellus B,
54, 407–411, 2002.
Traversi, R., Becagli, S., Castellano, E., Largiuni, O., Migliori, A.,
Severi, M., Frezzotti, M., and Udisti, R.: Spatial and temporal distribution
of environmental markers from Coastal to Plateau areas in Antarctica by firn
core chemical analysis, Int. J. Environ. Anal. Chem., 84, 457–470,
https://doi.org/10.1080/03067310310001640393, 2004.
Udisti, R., Dayan, U., Becagli, S., Busetto, M., Frosini, D., Legrand, M.,
Lucarelli, F., Preunkert, S., Severi, M., and Traversi, R.: Sea spray
aerosol in central Antarctica. Present atmospheric behaviour and
implications for paleoclimatic reconstructions, Atmos. Environ., 52,
109–120, https://doi.org/10.1016/j.atmosenv.2011.10.018, 2012.
Virkkula, A., Teinilä, K., Hillamo, R., Kerminen, V.-M., Saarikoski, S., Aurela, M., Viidanoja, J., Paatero, J., Koponen, I. K., and Kulmala, M.: Chemical composition of boundary layer aerosol over the Atlantic Ocean and at an Antarctic site, Atmos. Chem. Phys., 6, 3407–3421, https://doi.org/10.5194/acp-6-3407-2006, 2006.
Wagenbach, D., Ducroz, F., Mulvaney, R., Keck, L., Minikin, A., Legrand, M.,
Hall, J. S., and Wolff, E. W.: Sea-salt aerosol in coastal Antarctic regions,
J. Geophys. Res., 103, 10961–10974, 1998.
Weller, R., Wagenbach, D., Legrand, M., Elsässer, C., Tian-kunze, X.,
and Königlanglo, G.: Continuous 25-yr aerosol records at coastal
Antarctica: inter-annual variability of ionic compounds and links to
climate indices, Tellus B, 63, 901–919,
https://doi.org/10.1111/j.1600-0889.2011.00542.x, 2011.
Wolff, E. W., Fischer, H., Fundel, F., Ruth, U., Twarloh, B., Littot, G. C.,
Mulvaney, R., Röthlisberger, R., de Angelis, M., Boutron, C. F., Hansson,
M., Jonsell, U., Hutterli, M. A., Lambert, F., Kaufmann, P., Stauffer, B.,
Stocker, T. F., Steffensen, J. P., Bigler, M., Siggaard-Andersen, M. L.,
Udisti, R., Becagli, S., Castellano, E., Severi, M., Wagenbach, D.,
Barbante, C., Gabrielli, P., and Gaspari, V.: Southern Ocean sea-ice extent,
productivity and iron flux over the past eight glacial cycles, Nature, 440,
491–496, https://doi.org/10.1038/nature04614, 2006.
Wolff, E. W., Barbante, S., Becagle, S., Bigler, M., Boutron, C. F.,
Castellano, E., de Angelis, M., and Federer, U.: Changes in environment over
the last 800,000 years from chemical analysis of the EPICA Dome C ice core,
Quaternary Sci. Rev., 29, 285–295, 2010.
Short summary
It is important to understand atmospheric chemistry over Antarctica under a changing climate. Thus snow collected on a traverse from the coast to Dome A was used to investigate variations in snow chemistry. The non-sea-salt fractions of K+, Mg2+, and Ca2+ are associated with terrestrial inputs, and nssCl− is from HCl. In general, proportions of non-sea-salt fractions of ions to the totals are higher in the interior areas than on the coast, and the proportions are higher in summer than in winter.
It is important to understand atmospheric chemistry over Antarctica under a changing climate....
