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Titolo:
Seasonal biogeochemical fluxes of Th-234 and Po-210 in the upper Sargasso Sea: Influence from atmospheric iron deposition
Autore:
Kim, G; Church, TM;
Indirizzi:
Seoul Natl Univ, Sch Earth & Environm Sci, Seoul 151742, South Korea SeoulNatl Univ Seoul South Korea 151742 Sci, Seoul 151742, South Korea Univ Delaware, Coll Marine Studies, Newark, DE 19716 USA Univ Delaware Newark DE USA 19716 ll Marine Studies, Newark, DE 19716 USA
Titolo Testata:
GLOBAL BIOGEOCHEMICAL CYCLES
fascicolo: 3, volume: 15, anno: 2001,
pagine: 651 - 661
SICI:
0886-6236(200109)15:3<651:SBFOTA>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
NORTH-ATLANTIC OCEAN; PACIFIC-OCEAN; PHYTOPLANKTON BLOOMS; DIATOM GROWTH; PB-210; NITROGEN; DISEQUILIBRIA; BERMUDA; SEAWATER; ACCURATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Kim, G Seoul Natl Univ, Sch Earth & Environm Sci, BK21, Seoul 151742, South Korea Seoul Natl Univ BK21 Seoul South Korea 151742 151742, South Korea
Citazione:
G. Kim e T.M. Church, "Seasonal biogeochemical fluxes of Th-234 and Po-210 in the upper Sargasso Sea: Influence from atmospheric iron deposition", GLOBAL BIOG, 15(3), 2001, pp. 651-661

Abstract

The naturally occurring radionuclide tracers, Th-234-U-238 and Po-210-Pb-210 pairs, were measured bimonthly at the Bermuda Atlantic Time-Series Study(BATS) site in the Sargasso Sea from October 1996 to August 1997. Biological production and biogeochemical fluxes of thorium, polonium, and particulate organic carbon were highest in December 1996 and August 1997. Although the enhanced production and fluxes in December 1996 could be due to winter nitrate inputs from the subsurface ocean, those in August 1997 were not expected, on the basis of the nutrient mass balance and extreme stratification of the Sargasso Sea during this summer. The fixed-nutrient inputs from the atmosphere, eddy intrusion, or deepwater upwelling were unlikely sources ofsuch elevated summer productivity. Alternatively, the unusually high atmospheric "wet" deposition of Fe, which occurred during this summer period, appears to have fueled high nitrogen fixation and thus greater carbon and reactive-element export. Also as important, ocean production did not respond to significant "dry" deposition of Fe. This seems to be due to the reported lower solubility of Fe dust in seawater versus rainwater.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 19:57:10