Short time scale variations of Th-234/U-238 disequilibrium related to mesoscale variability on the continental slope of the Gulf of Lions (France) (Articolo in rivista)

Type

• Articolo in rivista (Classe)
• Prodotto della ricerca (Classe)

Label

• Short time scale variations of Th-234/U-238 disequilibrium related to mesoscale variability on the continental slope of the Gulf of Lions (France) (Articolo in rivista) (literal)

Anno

• 2007-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

• 10.1016/j.marchem.2007.03.007 (literal)

Alternative label

• Giuliani S. (a), Radakovitch O. (b), Frignani M. (a), Bellucci L.G. (a) (2007)
  Short time scale variations of Th-234/U-238 disequilibrium related to mesoscale variability on the continental slope of the Gulf of Lions (France)
  in Marine chemistry (Print)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Giuliani S. (a), Radakovitch O. (b), Frignani M. (a), Bellucci L.G. (a) (literal)

Pagina inizio

• 403 (literal)

Pagina fine

• 418 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni

• doi:10.1016/j.marchem.2007.03.007 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 106 (literal)

Rivista

• Marine chemistry (Rivista)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• (a) CNR, Istituto di Scienze Marine, Sede di Bologna, Via Gobetti 101, 40129 Bologna, Italy (b) CEREGE, Université Paul Cézanne Aix-Marseille III, Europole de l'arbois, F-13540 Aix-en-Provence, France (literal)

Titolo

• Short time scale variations of Th-234/U-238 disequilibrium related to mesoscale variability on the continental slope of the Gulf of Lions (France) (literal)

Abstract

• Th-234/U-238 disequilibrium was studied in the water column during three cruises (March–April 1997) carried out in the framework of the HFF experiment in the Gulf of Lions. The purposes were to investigate short temporal (15–20 days) and spatial (20–50 Km) variations in the water column and to determine export fluxes from the euphotic zone, in relation to environmental features of the study area. Sampling stations were identified in order to evaluate along and across slope transports. Activity-depth profiles show that both temporal and spatial variations occurred at the scale of the experiment. Th-234 deficiencies, with respect to U-238 and indicating removal from surface waters, can be observed at all stations, with higher values measured at the shelf break. Particulate thorium activities do not correlate directly with suspended matter concentration. Dissolved Th-234 values higher than U-238 activities were observed three times in surface waters. They are probably due to desorption processes favoured by vertical mixing and/or lateral transport by the Northern Current and the Rhone river. Fluxes and residence times were obtained using both steady-state (SS) and non-steady-state formalisms (NSS). Lateral transport was calculated to define intra-station influences. Results showed a complex spatial setting with generally higher export at the shelf break (due to enhanced vertical exchange and stronger continental influence), and agreed with the general circulation pattern, characterized by large anti-cyclonic meanders flowing from the Northern Current core area to coastal zones that produce an intense mesoscale activity. (literal)

Prodotto di

• Ricostruzioni paleoclimatiche da archivi marini alle medie ed alte latitudini (TA.P02.005.007) (Modulo)
• Marine science institute (ISMAR) (Istituto)

Autore CNR

• MAURO FRIGNANI (Unità di personale interno)
• LUCA GIORGIO BELLUCCI (Unità di personale interno)
• SILVIA GIULIANI (Persona)

Insieme di parole chiave

• Parole chiave di "Short time scale variations of Th-234/U-238 disequilibrium related to mesoscale variability on the continental slope of the Gulf of Lions (France)" (Insieme di parole chiave)

Incoming links:

Prodotto

• Marine science institute (ISMAR) (Istituto)
• Ricostruzioni paleoclimatiche da archivi marini alle medie ed alte latitudini (TA.P02.005.007) (Modulo)

Autore CNR di

• SILVIA GIULIANI (Persona)
• LUCA GIORGIO BELLUCCI (Unità di personale interno)
• MAURO FRIGNANI (Unità di personale interno)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Marine chemistry (Rivista)

Insieme di parole chiave di

• Parole chiave di "Short time scale variations of Th-234/U-238 disequilibrium related to mesoscale variability on the continental slope of the Gulf of Lions (France)" (Insieme di parole chiave)