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Chemical Profile of the Ross Ice Shelf at Little America V, Antarctica

  • C. C. Langway (a1), M. Herron (a1) and J. H. Cragin (a1)
Abstract

Measurements of the concentrations of Na+ K+, Mg2+, and Ca2+ were made on 28 samples from the 255 m deep ice core from Little America V. All concentrations decrease sharply with depth from the firn–ice transition at 52 m to somewhere between 125 m and 150 m. From 150 m to 250 m the cationic concentrations are relatively constant. This is interpreted to indicate that the ice above 125 m fell as snow on the Ross Ice Shelf and that ice below 150 m originated inland on Marie Byrd Land.

On a fait des mesures de concentrations d’ions Na+, K+, Mg2+, et Ca2+ sur 28 échantillons prélevés dans la carotte d’un forage de 255 m dans la glace provenant de Little America V. Toutes les concentrations décroissent rapidement avec la profondeur depuis la transition névé-glace vers 52 m jusqu’a un point entre 125 et 150 m. De 150 à 250 m, les concentrations en cations sont relativement constantes. On interprète ce fait comme une indication que la glace au-dessus de 125 m est tombée sous forme de neige sur la calotte de Ross et que la glace en dessous de 150 m a son origine dans l’intérieur de la Terre Marie Byrd.

Zusammenfassung

An 28 Proben des 255 m langen Bohrkerns von Little America V wurden die Konzentrationen von Na+, K+, Mg2+ und Ca2+ gemessen. Alle Konzentrationen nehmen vom Firn-Eis-Übergang in 52 m Tiefe bis zu einer Tiefe zwischen 125 m–150 m schnell mit zunehmender Tiefe ab. Von 150 m–250 m sind die Konzentrationen der Kationen relativ konstant. Dies wird als Anzeichen dafür gedeutet, dass das Eis über 125 m als Schnee auf das Ross-Schelfeis fiel, während das Eis unter 150 m landeinwärts vom Marie Byrd Land herstammt.

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References
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Journal of Glaciology
  • ISSN: 0022-1430
  • EISSN: 1727-5652
  • URL: /core/journals/journal-of-glaciology
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