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- W2003595495 abstract "Concentration levels of the organic acids HCOO− and CH3SO3−, inorganic acids NO3− and excess SO42− and ammonium were measured in pre-1900 AD ice layers from seven geographically dispersed inland sites in Greenland. Average multiple-year background concentration levels are calculated for each ion at each site from laboratory measurements of continuous core samples representing from 4 to 10 years of snow accumulation (32 to 80 individual measurements) from various time intervals. The HCOO− concentration level increases from 6 ng/g in the most northern colder site to 36 ng/g in the most southern warmer site; CH3SO3− increases from 0.9 ng/g to 2.8 ng/g; NO3− decreases from 83 ng/g to 37 ng/g; excess SO42− decreases from 43 ng/g to 19 ng/g, all with variability. The distribution of the NH4+ ion shows a nearly constant level at about 6 ng/g for all sites except Dye-2 where it reaches 10 ng/g. The deposition patterns for HCOO− and NH4+ on the ice sheet suggest major contributions arrive from sources originating from the southwest of Greenland." @default.
- W2003595495 created "2016-06-24" @default.
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- W2003595495 date "1993-12-14" @default.
- W2003595495 modified "2023-10-14" @default.
- W2003595495 title "Background levels of formate and other ions in ice cores from inland Greenland" @default.
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- W2003595495 doi "https://doi.org/10.1029/93gl03043" @default.
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