First results from stable-istope measurements on ice cores from Dronning Maud Land

• Main Authors: Oerter, Hans, Graf, Wolfgang, Meyer, Hanno, Wilhelms, Frank
• Format: Other/Unknown Material
• Language: English
• Published: PANGAEA 2004
• Subjects: B31; DML07C98_31; DML25S02_03; Dronning Maud Land; Antarctica; EDML; EDRILL; EPICA; EPICA_DML3; EPICA_DML7; EPICA-Campaigns; EPICA drill; EPICA Dronning Maud Land; DML28C01_00; European Project for Ice Coring in Antarctica; ICEDRILL; Ice drill; Kohnen Station; Neumayer Station (WMO89002); Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; SNOWPIT; Snow pit; SPP1158; SS0203; Annals of Glaciology; Antarc*; Antarctic; DML; ice core; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.728145; https://doi.org/10.1594/PANGAEA.728145

The European Project for Ice Coring in Antarctica (EPICA) focuses on the drilling of two deep ice cores, the first at Dome C and the second at Kohnen station (75°00' S, 0°04' E) in Dronning Maud Land (DML). This paper deals with stable-isotope records from ice cores drilled in DML. In the first season, the deep EPICA DML core reached a depth of 450 m, recovering ice approximately 7000 years old. Generally, the d18O record indicates a stable Holocene climate and shows low variability. However, during the last 4000 years (based on a preliminary time-scale) the d18O values decrease continuously by about 0.6%, and the deuterium excess values increase by about 0.5%. The correlation between d18O and the deuterium excess d is investigated for a 50m long core section and the near-surface snow. High-pass filtered profiles are positively correlated, whereas the correlation between low-pass filtered profiles is negative. A post-depositional effect due to diffusion processes can be seen in a sub-annually resolved profile from snow-pit samples. Changes in the seasonality of the evolution of the snow cover and the consequences for stable-isotope content are demonstrated with data from ice core B31.