Ratios of Mg2+/Na+ in snowpack and an ice core at Austfonna ice cap, Svalbard, as an indicator of seasonal melting

元データ International Glaciological Society

概要

Snowpack and ice-core samples were collected from the dome of Austfonna ice cap, Svalbard, in the spring of both 1998 and 1999. The samples were analyzed for anions, cations, pH, liquid electrical conductivity and oxygen isotopes. Concentrations of chemical components in snowpack with a history of melting were much lower than those in unmelted snowpack. There was a clear difference between Mg2+/Na+ ratios previously in melted snowpack (0.03 ± 0.02) and in unmelted snowpack (0.11 ± 0.02). We propose that the Mg2+/Na+ ratio can be used as an indicator of whether or not firn or bubbly ice in the Austfonna ice core has experienced melt percolation. The Mg2+/Na+ ratio indicates that firn or bubbly ice prior to AD 1920 was much less affected by melt percolation than firn or bubbly ice formed after 1920.

著者

Watanabe Okitsugu National Institute of Polar Research, Research Organization of Information and Systems
Kawada Kunio Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
Kawamura Kenji Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
Iizuka Yoshinori Institute Of Low Temperature Science Pan-okhotsk Research Center Hokkaido University
Watanabe O National Institute Of Polar Research Research Organization Of Information And Systems
Kamiyama K National Institute Of Polar Research Research Organization Of Information And Systems
Kawamura K Center For Atmospheric And Oceanic Studies Tohoku University
Kawada K Toyama Univ. Toyama
Watanabe Okitsusgu National Institute of Polar Research
Kawada Kunio Department Earth Science Toyama University
Kamiyama Kokichi National Institute Of Polar Research Research Organization Of Information And Systems
Watanabe Okitsugu National Institute Of Polar Research Research Organization Of Information And Systems
Iizuka Y Department Of General Education Yuge National College Of Maritime Technology
Igarashi M National Institute Of Polar Research

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