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Titolo:
Pore-water distribution and quantification of diffusive benthic fluxes of silicic acid, nitrate and phosphate in surface sediments of the deep Arabian Sea
Autore:
Grandel, S; Rickert, D; Schluter, M; Wallmann, K;
Indirizzi:
GEOMAR Res Ctr, Dept Environm Geol, D-24148 Kiel, Germany GEOMAR Res Ctr Kiel Germany D-24148 Environm Geol, D-24148 Kiel, Germany
Titolo Testata:
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
fascicolo: 14, volume: 47, anno: 2000,
pagine: 2707 - 2734
SICI:
0967-0645(2000)47:14<2707:PDAQOD>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
NORTHWESTERN INDIAN-OCEAN; PARTICULATE ORGANIC-CARBON; 1995 SOUTHWEST MONSOON; MARINE-SEDIMENTS; BIOGENIC SILICA; IN-SITU; ATLANTIC-OCEAN; PARTICLE-FLUX; MATTER; DIAGENESIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
80
Recensione:
Indirizzi per estratti:
Indirizzo: Grandel, S GEOMAR Res Ctr, Dept Environm Geol, Wischhofstr 1-3, D-24148 Kiel, Germany GEOMAR Res Ctr Wischhofstr 1-3 Kiel Germany D-24148 l, Germany
Citazione:
S. Grandel et al., "Pore-water distribution and quantification of diffusive benthic fluxes of silicic acid, nitrate and phosphate in surface sediments of the deep Arabian Sea", DEEP-SEA II, 47(14), 2000, pp. 2707-2734

Abstract

Benthic fluxes and pore-water compositions of silicic acid, nitrate and phosphate were investigated for surface sediments of the abyssal Arabian Sea during four cruises (1995-1998). Five sites located in the northern (NAST),western (WAST), central (CAST), eastern (EAST), and southern (SAST) Arabian Sea were revisited during intermonsoonal periods after the NE- and SW-Monsoon. Al these sites, benthic fluxes of remineralized nutrients From the sediment to the bottom water of 36-106, 102-350 and 4-16 mmol m(-2) yr(-1) were measured for nitrate, silicic acid and phosphate, respectively. The benthic fluxes and Fore-water compositions showed a distinct regional pattern. Highest fluxes were observed in the western and northern region of the Arabian Sea, whereas decreasing fluxes were derived towards the southeast. At WAST, the general temporal pattern of primary production, related to the NE-and SW-Monsoon, is reflected by benthic fluxes. In contrast, at sites NAST, SAST, CAST, and EAST a temporal pattern of fluxes in response to the monsoon is not obvious. Our results reveal a clear coupling between the generalregional pattern of production in surface waters and the response of the benthic environment, as indicated by the flux of remineralized nutrients, though a spatially differing degree of decoupling during transport and remineralization of particulate organic matter and biogenic opal was observed. This has to be taken into account regarding budget calculations and paleoceanographic topics. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 08:01:17