Correlations between concentrations of acids andoxygen isotope ratios in polar surface snow

           Investigation of centimeter-scale snow surface chemistry has been carried out at two polar sites with different site characteristics–in Dronning Maud Land, Antarctica and on the Greenland ice sheet, respectively. Large variations in both impurity content and stable oxygen isotope ratios (...

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Published in:Tellus. Series B, Chemical and physical meteorology Chemical and physical meteorology, 2007, Vol.59b, p.326
Main Authors: Jonsell, Ulf, Hansson, Margareta E., Mörth, Carl-Magnus
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Language:English
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Geovetenskap
NATURAL SCIENCES
NATURVETENSKAP
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description            Investigation of centimeter-scale snow surface chemistry has been carried out at two polar sites with different site characteristics–in Dronning Maud Land, Antarctica and on the Greenland ice sheet, respectively. Large variations in both impurity content and stable oxygen isotope ratios (   δ 18O) were found on the submeter scale. δ 18 O and the concentration of nitrate correlated at both sites (r   = 0.81 and 0.82, respectively). At the Antarctic site, δ 18 O is also correlated to concentrations of methanesulphonate (r   = 0.84) and sulphate (r = 0.83) while no such correlation exists at the Greenland site. Instead, a strong anticorrelation (r   = –0.85) between sulphate and methanesulphonate is found among the samples from the Greenland site. The ions correlating with   δ 18 O at the two sites were probably deposited as acids. Our tentative explanation is that local redeposition of water vapour enriching the snow surface with the lighter isotopes is associated with simultaneous enhanced scavenging of the acids. The responsible process thereby significantly alters the chemical signals of the snow surface.
doi_str_mv 10.1111/j.1600-0889.2007.00272.x
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Large variations in both impurity content and stable oxygen isotope ratios (   δ 18O) were found on the submeter scale. δ 18 O and the concentration of nitrate correlated at both sites (r   = 0.81 and 0.82, respectively). At the Antarctic site, δ 18 O is also correlated to concentrations of methanesulphonate (r   = 0.84) and sulphate (r = 0.83) while no such correlation exists at the Greenland site. Instead, a strong anticorrelation (r   = –0.85) between sulphate and methanesulphonate is found among the samples from the Greenland site. The ions correlating with   δ 18 O at the two sites were probably deposited as acids. Our tentative explanation is that local redeposition of water vapour enriching the snow surface with the lighter isotopes is associated with simultaneous enhanced scavenging of the acids. 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Large variations in both impurity content and stable oxygen isotope ratios (   δ 18O) were found on the submeter scale. δ 18 O and the concentration of nitrate correlated at both sites (r   = 0.81 and 0.82, respectively). At the Antarctic site, δ 18 O is also correlated to concentrations of methanesulphonate (r   = 0.84) and sulphate (r = 0.83) while no such correlation exists at the Greenland site. Instead, a strong anticorrelation (r   = –0.85) between sulphate and methanesulphonate is found among the samples from the Greenland site. The ions correlating with   δ 18 O at the two sites were probably deposited as acids. Our tentative explanation is that local redeposition of water vapour enriching the snow surface with the lighter isotopes is associated with simultaneous enhanced scavenging of the acids. The responsible process thereby significantly alters the chemical signals of the snow surface.</abstract><doi>10.1111/j.1600-0889.2007.00272.x</doi></addata></record>
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NATURVETENSKAP
title Correlations between concentrations of acids andoxygen isotope ratios in polar surface snow
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