Spatial variation of isotopic compositions of snowpack nitrate related to post-depositional processes in eastern Dronning Maud Land, East Antarctica

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  • Noro Kazushi
    Graduate School of Engineering, Osaka Prefecture University
  • Hattori Shohei
    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
  • Uemura Ryu
    Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus
  • Fukui Kotaro
    Tateyama Caldera Sabo Museum
  • Hirabayashi Motohiro
    National Institute of Polar Research
  • Kawamura Kenji
    National Institute of Polar Research
  • Motoyama Hideaki
    National Institute of Polar Research
  • Takenaka Norimichi
    Graduate School of Engineering, Osaka Prefecture University
  • Yoshida Naohiro
    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology Earth-Life Science Institute (ELSI), Tokyo Institute of Technology

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<p>To evaluate post-depositional loss from the snow surface and subsequent redistribution of nitrate, we determined the spatial variation of nitrate concentrations, as well as δ15N and Δ17O values of nitrate in surface snow, sampled along a latitudinal transect in eastern Dronning Maud Land, East Antarctica. The NO3– concentrations of surface snow ranged from 40.0 to 130.8 μg L–1, showing no obvious trends with latitude, while the δ15N(NO3–) in surface snow increased from coastal sites to inland sites, ranging from –19.4 to 165.5‰. The relationship between the isotopic values (δ15N and Δ17O) of nitrate and snow accumulation rate are consistent with other traverses studied in East Antarctica (e.g., from Dumont d’Urville station to Vostok, and from East Antarctic coast to Dome Argus), implying that post-depositional loss and redistribution occur similarly throughout East Antarctica.</p>

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