http://www.cnr.it/ontology/cnr/individuo/prodotto/ID171162
Particle fluxes in the deep Eastern Mediterranean basins: the role of ocean vertical velocities (Articolo in rivista)
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- Particle fluxes in the deep Eastern Mediterranean basins: the role of ocean vertical velocities (Articolo in rivista) (literal)
- Anno
- 2009-01-01T00:00:00+01:00 (literal)
- Alternative label
Patara, L; Pinardi, N; Corselli, C; Malinverno, E, Tonani, M, Santoleri R; Masina S (2009)
Particle fluxes in the deep Eastern Mediterranean basins: the role of ocean vertical velocities
in Biogeosciences (Print)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Patara, L; Pinardi, N; Corselli, C; Malinverno, E, Tonani, M, Santoleri R; Masina S (literal)
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- ISI Web of Science (WOS) (literal)
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- 1Centro Euro-Mediterraneo per i Cambiamenti Climatici (CMCC), Viale Aldo Moro 44, 40127 Bologna, Italy
2Laboratorio SINCEM, Universit`a di Bologna, Via S. Alberto 163, 48100 Ravenna, Italy
3Dipartimento di Scienze Geologiche e Geotecnologie, Universit`a Milano-Bicocca, Piazza della Scienza 4, 20126 Milan, Italy
4Istituto Nazionale di Geofisica e Vulcanologia (INGV), Viale Aldo Moro 44, 40127 Bologna, Italy
5Istituto di Scienze dell'Atmosfera e del Clima - C.N.R., Via del Fosso del Cavaliere 100, 00133 Rome, Italy (literal)
- Titolo
- Particle fluxes in the deep Eastern Mediterranean basins: the role of ocean vertical velocities (literal)
- Abstract
- This paper analyzes the relationship between
deep sedimentary fluxes and ocean current vertical velocities
in an offshore area of the Ionian Sea, the deepest
basin of the Eastern Mediterranean Sea. Sediment trap data
are collected at 500m and 2800m depth in two successive
moorings covering the period September 1999-May 2001.
A tight coupling is observed between the upper and deep
traps and the estimated particle sinking rates are more than
200mday-1. The current vertical velocity field is computed
from a 1/16×1/16 Ocean General Circulation Model simulation
and from the wind stress curl. Current vertical velocities
are larger and more variable than Ekman vertical velocities,
yet the general patterns are alike. Current vertical
velocities are generally smaller than 1mday-1: we therefore
exclude a direct effect of downward velocities in determining
high sedimentation rates. However we find that upward
velocities in the subsurface layers of the water column are
positively correlated with deep particle fluxes. We thus hypothesize
that upwelling would produce an increase in upper
ocean nutrient levels - thus stimulating primary production
and grazing - a few weeks before an enhanced vertical
flux is found in the sediment traps. High particle sedimentation
rates may be attained by means of rapidly sinking fecal
pellets produced by gelatinous macro-zooplankton. Other
sedimentation mechanisms, such as dust deposition, are also
considered in explaining large pulses of deep particle fluxes. (literal)
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