气候变化领域集成服务门户(CCPortal): Variability of sea salts in ice and firn cores from Fimbul Ice Shelf, Dronning Maud Land, Antarctica

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DOI	10.5194/tc-12-1681-2018
	Variability of sea salts in ice and firn cores from Fimbul Ice Shelf, Dronning Maud Land, Antarctica
	Vega C.P.; Isaksson E.; Schlosser E.; Divine D.; Martma T.; Mulvaney R.; Eichler A.; Schwikowski-Gigar M.
发表日期	2018
ISSN	19940416
卷号	12 期号:5
英文摘要	Major ions were analysed in firn and ice cores located at Fimbul Ice Shelf (FIS), Dronning Maud Land - DML, Antarctica. FIS is the largest ice shelf in the Haakon VII Sea, with an extent of approximately 36500km2. Three shallow firn cores (about 20m deep) were retrieved in different ice rises, Kupol Ciolkovskogo (KC), Kupol Moskovskij (KM), and Bläskimen Island (BI), while a 100m long core (S100) was drilled near the FIS edge. These sites are distributed over the entire FIS area so that they provide a variety of elevation (50-400ma.s.l.) and distance (3-42km) to the sea. Sea-salt species (mainly Na+ and Cl-) generally dominate the precipitation chemistry in the study region. We associate a significant sixfold increase in median sea-salt concentrations, observed in the S100 core after the 1950s, to an enhanced exposure of the S100 site to primary sea-salt aerosol due to a shorter distance from the S100 site to the ice front, and to enhanced sea-salt aerosol production from blowing salty snow over sea ice, most likely related to the calving of Trolltunga occurred during the 1960s. This increase in sea-salt concentrations is synchronous with a shift in non-sea-salt sulfate (nssSO42-) toward negative values, suggesting a possible contribution of fractionated aerosol to the sea-salt load in the S100 core most likely originating from salty snow found on sea ice. In contrast, there is no evidence of a significant contribution of fractionated sea salt to the ice-rises sites, where the signal would be most likely masked by the large inputs of biogenic sulfate estimated for these sites. In summary, these results suggest that the S100 core contains a sea-salt record dominated by the proximity of the site to the ocean, and processes of sea ice formation in the neighbouring waters. In contrast, the ice-rises firn cores register a larger-scale signal of atmospheric flow conditions and a less efficient transport of sea-salt aerosols to these sites. These findings are a contribution to the understanding of the mechanisms behind sea-salt aerosol production, transport and deposition at coastal Antarctic sites, and the improvement of the current Antarctic sea ice reconstructions based on sea-salt chemical proxies obtained from ice cores. © Author(s) 2018.
学科领域	aerosol; elevation; firn; ice shelf; precipitation (chemistry); precipitation (climatology); sea ice; sea salt; snow; sulfate; Antarctica; East Antarctica; Fimbul Ice Shelf; Queen Maud Land
语种	英语
scopus关键词	aerosol; elevation; firn; ice shelf; precipitation (chemistry); precipitation (climatology); sea ice; sea salt; snow; sulfate; Antarctica; East Antarctica; Fimbul Ice Shelf; Queen Maud Land
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119149
作者单位	Norwegian Polar Institute, Tromsø, N-9296, Norway; Department of Earth Sciences, Uppsala University, Villavägen 16, Uppsala, SE-75236, Sweden; Institute of Atmospheric and Cryospheric Sciences, University of Innsbruck, Innsbruck, Austria; Austrian Polar Research Institute, Vienna, Austria; Department of Geology, Tallinn University of Technology, Tallinn, Estonia; British Antarctic Survey, Madingley Road, Cambridge, Cambridgeshire, CB3 0ET, United Kingdom; Paul Scherrer Institute, Villigen PSI, 5232, Switzerland; School of Physics, University of Costa Rica, San Pedro de Montes de Oca, San Jose, 11501-2060, Costa Rica; Centre for Geophysical Research, University of Costa Rica, San Pedro de Montes de Oca, San Jose, 11501-2060, Costa Rica
推荐引用方式 GB/T 7714	Vega C.P.,Isaksson E.,Schlosser E.,et al. Variability of sea salts in ice and firn cores from Fimbul Ice Shelf, Dronning Maud Land, Antarctica[J],2018,12(5).
APA	Vega C.P..,Isaksson E..,Schlosser E..,Divine D..,Martma T..,...&Schwikowski-Gigar M..(2018).Variability of sea salts in ice and firn cores from Fimbul Ice Shelf, Dronning Maud Land, Antarctica.Cryosphere,12(5).
MLA	Vega C.P.,et al."Variability of sea salts in ice and firn cores from Fimbul Ice Shelf, Dronning Maud Land, Antarctica".Cryosphere 12.5(2018).