气候变化领域集成服务门户(CCPortal): Major ions in Fimbul Ice Shelf, Antarctica

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.889018
	Major ions in Fimbul Ice Shelf, Antarctica
	Vega; Carmen Paulina; Isaksson; Elisabeth; Schlosser; Elisabeth; Divine; Dmitry; Martma; Tõnu; Mulvaney; Robert; Eichler; Anja; Schwikowski-Gigar; Margit
发布日期	2018-04-24
数据集类型	dataset
英文简介	Major ions were analysed in firn/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 36 500 km2. Three shallow firn cores (about 20 m deep) were retrieved in different ice-rises, Kupol Ciolkovskogo (KC), Kupol Moskovskij (KM), and Blåskimen Island (BI), while a 100 m 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 (50–400 m a.s.l.) and distance (3– 42 km) to the sea. Sea-salt species (mainly Na+ and Cl−) generally dominate the precipitation chemistry in the study region. We associate a significant six-fold increase in median sea-salt concentrations, observed in the S100 core after the 1950s, to an enhanced exposure of the 100 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.
空间范围	Median Latitude: -70.320000 * Median Longitude: 1.480000 * South-bound Latitude: -70.520000 * West-bound Longitude: -3.030000 * North-bound Latitude: -70.130000 * East-bound Longitude: 4.800000
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215245
推荐引用方式 GB/T 7714	Vega,Carmen Paulina,Isaksson,et al. Major ions in Fimbul Ice Shelf, Antarctica.2018-04-24.https://doi.org/10.1594/PANGAEA.889018.