Density and stable oxygen isotope profiles of four snow pits from Berkner Island, Filchner-Ronne Ice Shelf, Antarctica ...

• Main Authors: Wagenbach, Dietmar, Graf, Wolfgang, Minikin, Andreas, Trefzer, Ulrich, Kipfstuhl, Sepp, Oerter, Hans, Blindow, Norbert
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1994
• Subjects: Firn auger; Snow pit; FRISP 1992; Sampling/drilling ice; Glaciology @ AWI AWI_Glac; Antarc*; Antarctica; Berkner Island; Filchner Ronne Ice Shelf; Filchner-Ronne Ice Shelf; Ice cap; ice core; Ice Shelf; Ronne Ice Shelf; Weddell Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.548752; https://doi.pangaea.de/10.1594/PANGAEA.548752

The ice cap on Berkner Island is grounded on bedrock within the Filchner-Ronne Ice Shelf and is, therefore, expected to be a well-suited place to retrieve long-term ice-core records reflecting the environmental situation of the Weddell Sea region. Shallow firn cores were drilled to 11 m at the two main summits of Berkner Island and analysed in high depth resolution for electrical d.c. conductivity (ECM), stable isotopes, chloride, sulphate, nitrate and methane-sulphonate (MSA). From the annual layering of dD and non-sea-salt (nss) sulphate, a mean annual snow accumulation of 26.6 cm water at the north dome and 17.4 cm water at the south dome are obtained. As a result of ineffective wind scouring indicated by a relatively low near-surface snow density, regular annual cycles are found for all species at least in the upper 4-5 m. Post depositional changes are responsible for a substantial decrease of the seasonal dD and nitrate amplitude as well as for considerable migration of the MSA signal operating below a ... : Supplement to: Wagenbach, Dietmar; Graf, Wolfgang; Minikin, Andreas; Trefzer, Ulrich; Kipfstuhl, Sepp; Oerter, Hans; Blindow, Norbert (1994): Reconnaissance of chemical and isotopic firn properties on top of Berkner Island, Antarctica. Annals of Glaciology, 20, 307-312 ...