Assessment of inter-annual and seasonal variability of the circulation over the shelf and slope off central ChileEntry ID: GLOBEC_038_CHL_002
Abstract: Assessment of inter-annual and seasonal variability of the circulation
over the shelf and slope off central Chile and the development of
simple models of free and wind-forced trapped waves
Hydrographic data together with current, sea level and wind
time-series from several places along the west coast of South America
were used to assess the temporal variability along this region. An
important ... set of current meter data used here were obtained during an
international study of the Humboldt Current system, as a contribution
to the Joint Global Flux Study Project (JGOFS). The extension of this
observational effort, supported in a second phase by the
FONDAP-Humboldt programme, have allowed the completion of an 8 year
record of moored current and temperature over the slope off Coquimbo,
near 30S. A sister mooring, located about 500km south from Coquimbo,
near 34 45'S, was maintained during October 1992 and July 1995 in
order to study the alongshore propogation of current fluctuations.
Time series of wind, sea-level and atmospheric pressure have been
analysed and current records used to address the time variability at
several scales over the slope off Chile. They encompass the moderate
1991-1992 and the strong 1997-1998 El Nino events and the 1995-96 and
1998 La Nina events.
Interannual fluctuations of alongshore currents off 30S and seal level
along the west coast of South America were analysed using a linear
model forced by observed equatorial signal and regional wind stress.
In addition, a wind-forced coastal trapped wave model was implemented
The circulation off Peninsula de Mejillones was analysed from
hydrographic profiles and current-meters moored during January and
This description is a member of a collection. The collection is described in
ATMOSPHERE > ATMOSPHERIC PRESSURE > PRESSURE ANOMALIES
ATMOSPHERE > ATMOSPHERIC PRESSURE > SEA LEVEL PRESSURE
ATMOSPHERE > ATMOSPHERIC PRESSURE > SURFACE PRESSURE
OCEANS > COASTAL PROCESSES > LONGSHORE CURRENTS
OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > CONTINENTAL MARGINS > CONTINENTAL RISES/SLOPES
OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > CONTINENTAL MARGINS > CONTINENTAL SHELVES
OCEANS > OCEAN CIRCULATION > BUOY POSITION
OCEANS > OCEAN CIRCULATION > OCEAN CURRENTS
OCEANS > OCEAN CIRCULATION > UPWELLING/DOWNWELLING
OCEANS > OCEAN CIRCULATION > WATER MASSES
OCEANS > OCEAN CIRCULATION > WIND-DRIVEN CIRCULATION
OCEANS > OCEAN CIRCULATION
OCEANS > OCEAN PRESSURE > SEA LEVEL PRESSURE
OCEANS > OCEAN WAVES > WAVE FREQUENCY
OCEANS > OCEAN WAVES > WAVE PERIOD
OCEANS > OCEAN WINDS > WIND STRESS
CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > TELECONNECTIONS > EL NINO SOUTHERN OSCILLATION (ENSO) > ENSO
BIOSPHERE > ECOSYSTEMS > MARINE HABITAT > PELAGIC HABITAT
Email: rescribano at uantof.cl
University of Antofagasta PO Box 170
Role: DIF AUTHOR
Phone: +44 (0)1752 633401
Fax: +44 (0)1752 633101
Email: globec at pml.ac.uk
GLOBEC International Project Office Plymouth Marine Laboratory Prospect Place
Postal Code: PL1 3DH
Published and In press
Rutllant J., H. Fuenzalida, R. Torres, & D. Figueroa,
1998. Interaccion oceano-atmosfera-tierra en la region de
Antofagasta (Chile, 23 degrees S) : Experimento DICLIMA (Land-air-sea
interaction at the Antofagasta region (Chile, 23 degrees S): The
DICLIMA experiment. Rev. Chil.Hist. Nat. 75:405-427.
Shaffer, G., S. Hormazabal, O. Pizarro & S. Salinas, 1999. Seasonal
and interannual variability of currents and temperature over the slope
off central Chile. J. Geophys. Res. 104, 29951-29961.
Pizarro, O., A. J. Clarke & S. Van Gorder. El Nino, sea level and
currents along the South American coast. J. Phys. Oceanogr.
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water into the rim of the Biobio submarine canyon as a response to
surface winds. Cont. Shelf Res.
Hormazabal, S., G. Shaffer, J. Letelier & O. Ulloa. Remote forcing
of SST in the coastal upwelling system off Chile. J. Geophys. Res.
Sobarzo, M. & D. Figueroa. The physical structure of a cold
filament in an upwelling zone (Peninsula de Mejillones, Chile,
23 degrees S). Deep Sea Res.
Figueroa, D., M. Sobarzo, S. Hormazabal, J. Rutllant. Modulation of
the physical coastal environment of an upwelling region produced by
remotely low frequency variability. Cont. Shelf Res.
Pizarro, O., 1999. Low frequency fluctuations in the Eastern
Boundary Current off South America: Remote and local forcing. Ph. D. Thesis, Goteborg University, Sweden, 1999.
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Creation and Review Dates
DIF Creation Date: 2001-08-06
Last DIF Revision Date: 2016-01-27