Characteristics of modern atmospheric dust deposition in snow on the Penny Ice Cap, Baffin Island, Arctic Canada
1998 (English)In: Tellus, Series B: Chemical and Physical Meteorology, Vol. 50, no 5, 506-520 p.Article in journal (Refereed) PublishedText
We evaluated the concentration, size and distribution of insoluble dust microparticles in snow-pits on the Penny Ice Cap (PIC), Ba n Island, to define ( 1) the characteristics of modern atmospheric dust deposition at the site, (2 ) the relative contributions of proximal and distal dust sources, and ( 3) the e ects of summer melting on depositional signals in snow. The mean concentration ( 143 mg kg−1), flux (4.8 mg cm2 yr−1) and diameter (2.3 mm) of dust deposited on the PIC are similar to those observed in remote Arctic sites such as central Greenland, implying that dust is primarily supplied through long-range transport from far-removed source regions (at least 100–1000 km distant). There is evidence for two seasonal maxima of dust deposition, one in late winter-early spring and one in late summer-early fall, although seasonal signals can not always be resolved in the snowpack due to some post-depositional particle migration with summer melt. However, ice layers appear to limit the mobility of particles, thereby preserving valuable paleoclimatic information in the PIC ice core dust record at a multi-annual to decadaltemporal resolution.
Place, publisher, year, edition, pages
1998. Vol. 50, no 5, 506-520 p.
Atmospheric dust, ice cores, Arctic, aerosols, Canada
Other Earth and Related Environmental Sciences
Research subject Earth Science with specialization in Physical Geography
IdentifiersURN: urn:nbn:se:uu:diva-300890ScopusID: 2-s2.0-0032413788OAI: oai:DiVA.org:uu-300890DiVA: diva2:952783
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