Data Description

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Citation:
Wagenbach, D et al. (1994): Density and stable oxygen isotope profiles of four snow pits from Berkner Island, Filchner-Ronne Ice Shelf, Antarctica. doi:10.1594/PANGAEA.548752,
Supplement to: Wagenbach, Dietmar; Graf, Wolfgang; Minikin, Andreas; Trefzer, Ulrich; Kipfstuhl, Josef; Oerter, Hans; Blindow, Norbert (1994): Reconnaissance of chemical and isotopic firn properties on top of Berkner Island, Antarctica. Annals of Glaciology, 20, 307-312, hdl:10013/epic.15271.d001
Abstract:
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 depth of 3-4 m. The mean chemical and isotopic firn properties at the south dome correspond to the situation on the Filchner-Ronne Ice shelf at a comparable distance to the coast, whereas the north dome is found to be more influenced by maritime air masses. Persistent high sea-salt levels in winter snow at Berkner Island heavily obscure the determination of nss sulphate probably due to sulphate fractionation in the Antartic sea-salt aerosols. Estimated time-scales predict ages at 400 m depth to be ca. 2000 years for the north and ca. 3000 years for the south dome. Pleistocene ice is expected in the bottom 200 and 300 m, respectively.
Project(s):
Glaciology @ AWI (AWI_Glac) *
Coverage:
Median Latitude: -78.979000 * Median Longitude: -45.950000 * South-bound Latitude: -79.658000 * West-bound Longitude: -46.283000 * North-bound Latitude: -78.300000 * East-bound Longitude: -45.617000
Minimum Age: -0.039 ka BP * Maximum Age: -0.012 ka BP
Event(s):
BER01C90_01 (FBIN North-dome) * * Latitude: -78.300000 * Longitude: -46.283000 * Date/Time: 1990-01-06T00:00:00 * Elevation: 730.0 m * Recovery: 11.60 m * Location: Berkner Island (Reinwarthhöhe) * * Campaign: FRISP 1992 (Filchner-Ronne-Ice-Shelf-Project) * * Basis: Sampling/drilling ice * * Device: Firn auger * * Comment: sampling during ANT-VIII/5
BER01S90_01 (SSBerkN North-dome) * * Latitude: -78.300000 * Longitude: -46.283000 * Date/Time: 1990-01-06T00:00:00 * Elevation: 730.0 m * Recovery: 1.97 m * Location: Berkner Island (Reinwarthhöhe) * * Campaign: FRISP 1992 (Filchner-Ronne-Ice-Shelf-Project) * * Basis: Sampling/drilling ice * * Device: Snow pit * * Comment: sampling during ANT-VIII/5
BER02C90_02 (FBIS South-dome) * * Latitude: -79.658000 * Longitude: -45.617000 * Date/Time: 1990-01-06T00:00:00 * Elevation: 940.0 m * Recovery: 11.05 m * Location: Berkner Island (Thyssenhöhe) * * Campaign: FRISP 1992 (Filchner-Ronne-Ice-Shelf-Project) * * Basis: Sampling/drilling ice * * Device: Firn auger * * Comment: sampling during ANT-VIII/5
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