Abstract
A 1.29 m continuous vertical ice core from 300 m depth at Site 2, Greenland, was split lengthwise, and horizontally adjacent specimens were analyzed for 18O/16O ratios and microparticle concentration between 0.6 and 3 microns diameter. Both sets of data showed cyclic variation in vertical profile. Almost four complete cycles were present. Average wave lengths of the cycles were ⩾ 35.3 and 36.0 cm ice for 18O/16O and particle concentration respectively, probably close to the annual accumulation 700 years ago. Average volume concentration of microparticles in mid-winter precipitations, about 6 × 10−8, was six times greater than the average found over the rest of the year. Peak dust concentrations occurred 4 cm higher (later) than the isotope ratio minima. This phase lag amounts to about 6 weeks, if water accumulation rate is assumed constant over the year. Dust concentration data were also used to calculate an upper limit for atmospheric fallout for this time and place. Assuming a dust density of 3 g cm−3, a value of 2 × 10−6 g cm−2 yr−1 is obtained.
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