ARCTIC *l'Pb Flux in an Arctic Coastal Region'
ABSTRACT. Seven marine coastal cores and one lake core were collected from a deltaic region in northern Alaska and analyzed for '"Pb. The "'Pb activity levels at the surface in all cores were less than the levels generally observed in coastal sediments of nonpolar regions. The at...
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| Format: | Text |
| Language: | English |
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1985
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.656.1414 http://arctic.synergiesprairies.ca/arctic/index.php/arctic/article/viewFile/2047/2024/ |
| Summary: | ABSTRACT. Seven marine coastal cores and one lake core were collected from a deltaic region in northern Alaska and analyzed for '"Pb. The "'Pb activity levels at the surface in all cores were less than the levels generally observed in coastal sediments of nonpolar regions. The attenuated flux of "'Pb to this region, as deduced from analyses of snow deposits, is probably responsible for these reduced activity levels. Yet the calculated flux of this nuclide to the sediments (about 1 and 4 dpm cm- ' y " in the marine and lake sediments respectively) is in excess of that accountable from the atmospheric flux (0.08 dpm cm- ' y"). Presumably processes such as advection of " q b contribute importantly to the sedimentary flux. Key words: lead, cores, arctic coastal plain, radionuclide flux, air masses, lake sediments. &SUMÉ. Sept carottes côtières marines et une carotte de lac furent recueillies d'une rtgion deltaîque dans le nord de l'Alaska et analysées quant à leur teneur en ""Pb. Les niveaux d'activitt de *'?b à la surface de toutes les carottes ttaient moins élevés que les niveaux ordinairement observés dans les sédiments côtiers des dgions non polaires. Le flux atténué de " q b cette rtgion tel que détermint par l'analyse de dépôts de neige explique probablement ces niveaux d'activitt dduite. Cependant, le flux calcul6 de ce nuclide aux stdiments (environ 1 et 4 dpm cm- * y- ' dans les sédiments marins et lacustres, respectivement) exctde la quantité attribuable au flux atmosphtrique (0.08 dpm cm- ' y-'). Les processus tel que l'advection du ""Pb contribuent probablement de façon importante au flux sédimentaire. Mots clbs: plomb, carottes, plaine côtière arctique, flux de radionuclides, masses d'air, sédiments lacustres Traduit pour le journal par Maurice Guibord. |
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