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Oxygen isotope ratio (δ18O) and concentrations of Al, Na+, methanesulfonic acid (MSA), SO42−, and selenium (Se) in a continuous series of 70 snow samples from a 3.2-m snow pit at a site in northwestern Greenland were determined using ultraclean procedures.Well-defined depth profiles of δ18O, Al, and sea-salt-Na+ allowed the determination of chronology of the snow pit that spanned approximately 6years...
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