Publication Date:
2024-03-05
Description:
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.
Keywords:
Accumulation rate ice, water equivalent; Age; AGE; Ammonium; AWI_Glac; B25; BER11C95_25; Calcium; Calculated; Calculated, CFA layer counting; CFA; Chloride; Conductivity, electrolytic; Continuous Flow Analysis; Depth, bottom/max; DEPTH, ice/snow; Depth, 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; Sulfate, non-sea-salt; δ18O, water; δ Deuterium
Type:
Dataset
Format:
text/tab-separated-values, 17133 data points
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