Chemistry record of icecore BER11C95_25

• Main Authors: Ruth, Urs, Wagenbach, Dietmar, Oerter, Hans
• Format: Dataset
• Language: English
• Published: PANGAEA 2004
• Subjects: Accumulation rate ice; water equivalent; Age; Ammonium; AWI_Glac; B25; BER11C95_25; Calcium; Calculated; CFA layer counting; CFA; Chloride; Conductivity; electrolytic; Continuous Flow Analysis; Depth; bottom/max; ice/snow; top/min; Deuterium excess; Fluoride; Glaciology @ AWI; ICEDRILL; Ice drill; Ion chromatography; Laser particle counter; KLOTZ; Mass spectrometer VG SIRA 10; Methane sulfonic acid; Nitrate; Particle concentration; Sulfate; non-sea-salt; δ18O; water; δ Deuterium; Annals of Glaciology; Antarc*; Antarctica; Berkner Island; ice core
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.400910; https://doi.org/10.1594/PANGAEA.400910

A 181 m deep ice core drilled in 1994/95 on the south dome of Berkner Island, Antarctica, was analyzed for stable isotopes, major ions and microparticle concentrations. Samples for ion chromatography were prepared by using a novel technique of filling decontaminated sample from a device for continuous ice-core melting directly into the sample vials. The core was dated through identification of volcanic horizons and interpolative layer counting. The core, together with a similar core from the north dome, reveals a 1000 year history of relatively stable climate. Temporal variations in the two cores deviate from each other owing to changing patterns of regional-scale circulation; the best correspondence between them is found for MSA-. delta18O, accumulation rate and a sea-salt proxy show only negligible correlation, which suggests a complex meteorological setting. Increasing annual accumulation is observed for the last 100 years. A period of increased sea-salt concentrations started around AD 1405, as has also been observed in other cores. Microparticle concentrations are on average 1220 particles (>=1.0 ?m diameter)/mL; they are enhanced from AD 1200 to 1350, possibly because of a higher atmospheric mineral dust load or because local volcanic activity was stronger than previously thought. Microparticles and NH4+show marked but multiple and very irregular sub-annual peaks; long-term stacking of 1 year data intervals yields seasonal maxima in austral spring or mid-summer, respectively. Post-depositional redistribution was observed for MSA, NO3- and F- at volcanic horizons.