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Titolo:
RARE-EARTH ELEMENT COMPOSITION OF PRECIPITATION, PRECIPITATION PARTICLES, AND AEROSOLS
Autore:
SHOLKOVITZ ER; CHURCH TM; ARIMOTO R;
Indirizzi:
WOODS HOLE OCEANOG INST WOODS HOLE MA 02543 UNIV DELAWARE,COLL MARINE STUDIES NEWARK DE 19716 UNIV RHODE ISL,GRAD SCH OCEANOG,CTR ATMOSPHER CHEM STUDIES KINGSTON RI 02881
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
fascicolo: D11, volume: 98, anno: 1993,
pagine: 20587 - 20599
Fonte:
ISI
Lingua:
ENG
Soggetto:
NORTH-ATLANTIC OCEAN; ISOTOPIC COMPOSITION; TRACE-ELEMENTS; SAHARAN DUST; MARINE-SEDIMENTS; SARGASSO SEA; WATER COLUMN; SEAWATER; ND; NEODYMIUM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
74
Recensione:
Indirizzi per estratti:
Citazione:
E.R. Sholkovitz et al., "RARE-EARTH ELEMENT COMPOSITION OF PRECIPITATION, PRECIPITATION PARTICLES, AND AEROSOLS", JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 98(D11), 1993, pp. 20587-20599

Abstract

We report the rare earth element (REE) composition of aerosols and precipitation (dissolved and particle phases) from Bermuda, Lewes (Delaware), and Woods Hole (Massachusetts). There is large-scale fractionation of REEs between the continents, atmosphere, and the oceans. The REEcompositions of atmospheric samples are highly fractionated relative to (1) each other (e.g., aerosol/precipitation pairs), (2) the upper crust of the Earth, and (3) seawater. Precipitation samples exhibit markedly convex-up shale-normalized patterns, large negative Eu anomaliesand large and systematic depletions in the heavy REE (Lu > Yb > Er > Dy). Aerosols are strongly depleted in the heavy REE which dissolutions experiments show are attributable to the presence of HREE-enriched refractory minerals. We argue that in situ selective dissolution of mineral aerosol panicles is responsible for the unusual REE composition of precipitation. This has major implications for the interpretation ofthe biogeochemical cycles of REEs in the oceans, particularly the partitioning between solution and particle phases, residence times, and the composition of seawater.

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Documento generato il 30/11/20 alle ore 05:58:01