Nitrate stable isotopes and major ions in snow and ice samples from four Svalbard sites

Polar research

Alina Marca¹  Jan Kaiser²  Veijo A. Pohjola³  Rickard Pettersson³  Carmen P. Vega³  Mats P. Björkman⁴  Tõnu Martma⁵  Elisabeth Isaksson⁶ 

[1] Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK;Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UKCorrespondence;Department of Earth Sciences, Uppsala University, Villavägen 16, SE-76236 Uppsala, Sweden;Department of Earth SciencesUniversity of Gothenburg, P.O. Box 460, SE-40530 Göteborg, Sweden;Institute of GeologyTallinn University of Technology, Ehitajate tee 5, EE-19086 Tallinn, Estonia;Norwegian Polar InstituteFram Centre, P.O. Box 6606 Langnes, NO-9296 Tromsø, Norway

关键词: Nitrate;    isotopes;    ice cores;    Svalbard;    pollutants.;   

DOI  :  10.3402/polar.v34.23246

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Increasing reactive nitrogen (Nr) deposition in the Arctic may adversely impact N-limited ecosystems. To investigate atmospheric transport of Nr to Svalbard, Norwegian Arctic, snow and firn samples were collected from glaciers and analysed to define spatial and temporal variations (1–10 years) in major ion concentrations and the stable isotope composition (δ 15N and δ 18O) of nitrate ( ) across the archipelago. The and averaged −4‰ and 67‰ in seasonal snow (2010–11) and −9‰ and 74‰ in firn accumulated over the decade 2001–2011. East–west zonal gradients were observed across the archipelago for some major ions (non-sea salt sulphate and magnesium) and also for and in snow, which suggests a different origin for air masses arriving in different sectors of Svalbard. We propose that snowfall associated with long-distance air mass transport over the Arctic Ocean inherits relatively low due to in-transport N isotope fractionation. In contrast, faster air mass transport from the north-west Atlantic or northern Eu...

【 授权许可】

CC BY-NC