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

Forskningsöversiktsartikel
Författare C. P. Vega
Mats P. Björkman
V. A. Pohjola
E. Isaksson
R. Pettersson
T. Martma
A. Marca
J. Kaiser
Publicerad i Polar Research
Volym 34
Sidor Article nr. 23246
ISSN 0800-0395
Publiceringsår 2015
Publicerad vid Institutionen för geovetenskaper
Sidor Article nr. 23246
Språk en
Länkar dx.doi.org/10.3402/polar.v34.23246
Ämnesord Nitrate, isotopes, ice cores, Svalbard, pollutants, ATMOSPHERIC NITRATE, N-15/N-14 RATIOS, DENITRIFIER METHOD, GREENLAND, LOMONOSOVFONNA, CORES, ACCUMULATION, TRENDS, RECORD, SUMMIT, Ecology, Geosciences, Multidisciplinary, Oceanography, -JRC/PBL
Ämneskategorier Geologi, Oceanografi

Sammanfattning

Increasing reactive nitrogen (N-r) deposition in the Arctic may adversely impact N-limited ecosystems. To investigate atmospheric transport of N-r 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 (delta N-15 and delta O-18) of nitrate (NO3-) across the archipelago. The delta N-15(NO3-) and delta O-18(NO3-) averaged -4 parts per thousand and 67 parts per thousand in seasonal snow (2010-11) and -9 parts per thousand and 74 parts per thousand 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 delta N-15(NO3-) and delta O-18(NO3-) 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 delta N-15(NO3-) due to in-transport N isotope fractionation. In contrast, faster air mass transport from the north-west Atlantic or northern Europe results in snowfall with higher delta N-15(NO3-) because in-transport fractionation of N is then time-limited.

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