Asian dustfall in the St. Elias Mountains, Yukon, Canada
| Autor: | J.E. Vaive, Isabelle Girard, Aloys Bory, Christian Zdanowicz, Pierre E. Biscaye, Yuri Amelin, Jeanne B. Percival, Gwendy E.M. Hall |
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| Přispěvatelé: | Geological Survey of Canada [Ottawa] (GSC Central & Northern Canada), Geological Survey of Canada - Office (GSC), Natural Resources Canada (NRCan)-Natural Resources Canada (NRCan), Lamont-Doherty Earth Observatory (LDEO), Columbia University [New York], British Antarctic Survey (BAS), Natural Environment Research Council (NERC) |
| Rok vydání: | 2006 |
| Předmět: |
Geochemical fluxes
Mineral aerosols 010504 meteorology & atmospheric sciences Asian Dust Asian dust Storm Metal pollution 010502 geochemistry & geophysics Inner mongolia 01 natural sciences Ice core [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry 13. Climate action Geochemistry and Petrology Climatology Aeolian processes North Pacific Physical geography Far East Geology Snow chemistry 0105 earth and related environmental sciences Isotope analysis |
| Zdroj: | Geochimica et Cosmochimica Acta Geochimica et Cosmochimica Acta, Elsevier, 2006, 70 (14), pp.3493-3507. ⟨10.1016/j.gca.2006.05.005⟩ |
| ISSN: | 0016-7037 |
| Popis: | International audience; In April 2001, a major atmospheric dustfall event occurred in the St. Elias Mountains, Yukon Territory, Canada. Field samples were collected and analyzed for particle size, mineralogy, chemical composition and Sr, Nd and Pb isotopes. Dusts found above ∼3000 m had their source in the Gobi desert region of northern China and Inner Mongolia, and were transported to the Yukon following a series of major dust storms that took place in early April. Dusts found below 3000 m had local (Yukon) or mixed source(s). The Asian dusts had a modal volume diameter of ∼4 μm typical of far-traveled mineral aerosols. However larger (>10 μm) particles were also found at ∼5000 m, suggesting a very rapid trans-Pacific transport in the mid-troposphere. We estimate that the April 2001 event deposited from 5500 to 6335 tons of dust over an area of 21,000 km2 in the southwestern Yukon, most of which probably fell within a week. Our findings are consistent with instrumental observations and model simulations of the April 2001 event. While the dust cloud was reportedly mixed with volatile pollutants from Asia, we found no evidence of metal pollution associated with the dustfall in the Yukon. Our findings contribute to clarify the dynamics and the geochemical impact of Asian dust long-range transport events, and to better estimate eolian fluxes of dustborne elements (e.g., Fe) to the Ocean associated with such events. They may also assist in identifying past Asian dust events in ice cores drilled from the St. Elias Mountains icefields, to develop a long-term record of their frequency, magnitude and source(s). |
| Databáze: | OpenAIRE |
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