A 100 year record of ion chemistry from Agassiz Ice Cap Northern Ellesmere Island NWT,Canada |
| |
| Institution: | 1. Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada, K1A 0E8;2. Nagaoka Institute of Snow and Ice Studies, National Research Institute of Earth Science, & Disaster Prevention, Nagaoka, Japan;1. Université de Lille: 1, place de Verdun, F-59 000 Lille, France;2. Faculté de Médecine, Université de Lille 2, EA 4483: 1, place de Verdun, F-59 000 Lille, France;3. Centre Hospitalier Régional et Universitaire de Lille: 2, avenue Oscar Lambret, 59037 Lille Cedex, France;4. Institut National de Recherche et de Sécurité: Rue du Morvan, CS 60027, F-54 519 Vandœuvre-lès-Nancy Cedex, France;5. Centre Universitaire de Mesure et d’Analyse, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille 2: 3, rue du Professeur Laguesse, BP 83, F-59 006 Lille Cedex, France;6. Ultra Trace Analyse Aquitaine: Technopole Hélioparc, 2 avenue Pierre Angot, F-64 053 Pau Cedex 9, France;1. Department of Geology and Rubenstein School of Environment and Natural Resources, University of Vermont, Burlington, VT 05405, USA;2. Department of Earth and Planetary Sciences, Northwestern University, Evanston IL 60208, USA;3. Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;4. Scottish Universities Environmental Research Centre (SUERC), East Kilbride G75 0QF, UK;1. Utah State University, Department of Geology, Logan, UT, USA;2. University of Minnesota-Morris, Division of Math and Science, Morris, MN, USA;3. Minnesota Department of Natural Resources, St. Paul Minnesota, USA;1. Department of Ophthalmology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;2. Duke Eye Center, Duke University, Durham, North Carolina;3. Department of Ophthalmology, Kaiser Permanente Woodland Hills Medical Center, Woodland Hills, California;4. Department of Ophthalmology, The Glaucoma Center, Bowie, Maryland;5. The Moreton Eye Group, Brisbane, Queensland, Australia;6. South Florida Eye Health, Hollywood, Florida;7. Moorefields Eye Hospital and Department of Epidemiology and Genetics, Institute of Ophthalmology, University College of London, London, United Kingdom;1. Linnaeus University, Department of Biology and Environmental Science, 39182, Kalmar, Sweden;2. University of Helsinki, Department of Chemistry, Laboratory of Radiochemistry, 00014 Helsinki, Finland;3. Terralogica AB, 44372, Gråbo, Sweden;4. Geological Survey of Finland, 02150 Espoo, Finland;1. Department of Geology and Rubenstein School of Environment and Natural Resources, University of Vermont, Burlington, VT 05405, United States;2. Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;3. Scottish Universities Environmental Research Centre (SUERC), East Kilbride G75 0QF, UK |
| |
| Abstract: | Two ice cores from the top of Agassiz Ice Cap, one from a snow scoured and the other from an unscoured zone, cover 80 and 100 yr of snow deposition respectively. The time scale for the cores is based on seasonal ion signals, a known stratigraphic horizon (1962), and a marked volcanic signature of high SO2-4, representing Katmai (1912). A marked increase in the SO2-4 and NO-3 ion which began in the middle of the 19th century is compared with the earlier increase in Greenland and attributed to a different combination of aerosol sources. A case is made for dry deposition of ions in winter, based on the continued presence of winter ion peaks at a site that δ18O indicates has almost no winter snow accumulation. This case is supported by the snowfall record at a nearby Automatic Weather Station, which shows there is very little winter snowfall at these sites, and by the fact that different accumulation rates and ion concentrations at each site effect almost the same ion fluxes. There is no evidence in either of the cores for a change in the levels of pollutant NO-3 and SO2-4 ion concentrations, due to improvement in emission technologies in the western nations, over the last two decades. The lack of change may indicate that Russia is the dominant source for aerosols at this site. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
