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Titolo:
Mercury in dated Greenland marine sediments
Autore:
Asmund, G; Nielsen, SP;
Indirizzi:
Natl Environm Res Inst, Dept Arctic Environm, Copenhagen, Denmark Natl Environm Res Inst Copenhagen Denmark Environm, Copenhagen, Denmark Riso Natl Lab, Nucl Safety Res & Facil Dept, Roskilde, Denmark Riso Natl Lab Roskilde Denmark fety Res & Facil Dept, Roskilde, Denmark
Titolo Testata:
SCIENCE OF THE TOTAL ENVIRONMENT
fascicolo: 1-3, volume: 245, anno: 2000,
pagine: 61 - 72
SICI:
0048-9697(20000117)245:1-3<61:MIDGMS>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
SELENIUM; LAKES;
Keywords:
sediments; Arctic; mercury; diagenesis; manganese; lead-210;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Asmund, G Natl Environm Res Inst, Dept Arctic Environm, Tagensvej 135, Copenhagen, Denmark Natl Environm Res Inst Tagensvej 135 Copenhagen Denmark enmark
Citazione:
G. Asmund e S.P. Nielsen, "Mercury in dated Greenland marine sediments", SCI TOTAL E, 245(1-3), 2000, pp. 61-72

Abstract

Twenty marine sediment cores from Greenland were analysed for mercury, anddated by the lead-210 method. In general the cores exhibit a mercury profile with higher mercury concentrations in the upper centimetres of the core. The cores were studied by linear regression of In Hg vs, age of the sediment for the youngest 100 years. As a rule the mercury decreased with depth in the sediment with various degrees of significance. The increase of the mercury flux during the last 100 years is roughly a doubling. The increase may be of anthropogenic origin as it is restricted to the last 100 years. In four cores the concentration of manganese was found also to increase in thetop layers indicating diagenesis. In the other cases the higher concentrations were not accompanied by higher manganese concentrations. The mercury flux to the sediment surface was generally proportional to the Pb-210 flux indicating that the mercury mainly originates from atmospheric washout. But the large variability indicates that other processes also influence the mercury flux to Arctic marine sediments. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 10:00:39