Article (Scientific journals)
Off Shelf Fluxes of Labile Materials by an Upwelling Filament in the NW Iberian Upwelling System
Alvarez-Salgado, Xosé Antón; Doval, M. D.; Borges, Alberto et al.
2001In Progress in Oceanography, 50 (2-4), p. 321-337
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Abstract :
[en] Daily changes in the concentrations of carbon and nitrogen species were monitored during the course of a Lagrangian drifter experiment in a recurrent upwelling filament south of Cape Finisterre (NW Iberian Upwelling System). A drifting buoy released at the southern edge of the upwelling centre generated by the Cape moved 60km southwestwards from 3 to 7 August 1998. Organic matter in the 50m deep study water mass (average 77±2 μM C) consisted of: 57μM C of dissolved organic matter (DOM) with a C/N molar ratio of 19±2; 6μM C of DOM with a C/N ratio of 9±2, and 14μM C of 50% DOM and 50% suspended organic matter (POMsusp) with a C/N ratio of 6.0±0.4. Net conversion of consumed inorganic salts into accumulated TOM=POMsusp+DOM was 40% for nitrogen and 30% for carbon. Since the parcel of water crossed the shelf-edge, these conversion efficiencies are equivalent to net horizontal export-ratio of 0.4 and 0.3 respectively. A second drifter was deployed in the offshore-end of the filament, and was displaced 20km west between 14 and 17 August 1998. Nitrate was exhausted in the surface water and no significant changes were observed in the variables measured during the course of the second experiment. Low C/N ratios (6.5±0.4) and rapid POMsusp/DOM inter-conversion in the 20 μM C excess observed in the study volume points to the persistence of the labile materials formed on the shelf during transport to the ocean. Our data demonstrate a) the key role of upwelling filaments in off-shelf export of organic materials and b) the major contribution of DOM to this horizontal export, a previously unaccounted amount.
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Alvarez-Salgado, Xosé Antón;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Doval, M. D.
Borges, Alberto  
Joint, I.
Frankignoulle, Michel
Woodward, E. M. S.
Figueiras, F. G.
Language :
English
Title :
Off Shelf Fluxes of Labile Materials by an Upwelling Filament in the NW Iberian Upwelling System
Publication date :
2001
Journal title :
Progress in Oceanography
ISSN :
0079-6611
Publisher :
Pergamon Press - An Imprint of Elsevier Science, Oxford, United Kingdom
Volume :
50
Issue :
2-4
Pages :
321-337
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 17 December 2008

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