Assessment of inter-annual and seasonal variability of the circulation over the shelf and slope off central Chile
Entry ID: GLOBEC_038_CHL_002

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Summary
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
and run.

The circulation off Peninsula de Mejillones was analysed from
hydrographic profiles and current-meters moored during January and
July 1997.

Parent DIF
This data set description is a member of a collection. The collection is described in
GLOBEC_023_CHL_001


Geographic Coverage
 N: -15.72 S: -56.79  E: -64.9  W: -77.16

Location Keywords
OCEAN > PACIFIC OCEAN > SOUTH PACIFIC OCEAN > Humboldt Current System
CONTINENT > SOUTH AMERICA > CHILE


Science Keywords
ATMOSPHERE >ATMOSPHERIC PRESSURE >PRESSURE ANOMALIES    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >SEA LEVEL PRESSURE    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >SURFACE PRESSURE    [Definition]
OCEANS >COASTAL PROCESSES >LONGSHORE CURRENTS    [Definition]
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >CONTINENTAL MARGINS >CONTINENTAL RISES/SLOPES    [Definition]
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >CONTINENTAL MARGINS >CONTINENTAL SHELVES    [Definition]
OCEANS >OCEAN CIRCULATION >BUOY POSITION    [Definition]
OCEANS >OCEAN CIRCULATION >OCEAN CURRENTS    [Definition]
OCEANS >OCEAN CIRCULATION >UPWELLING/DOWNWELLING    [Definition]
OCEANS >OCEAN CIRCULATION >WATER MASSES    [Definition]
OCEANS >OCEAN CIRCULATION >WIND-DRIVEN CIRCULATION    [Definition]
OCEANS >OCEAN CIRCULATION    [Definition]
OCEANS >OCEAN PRESSURE >SEA LEVEL PRESSURE    [Definition]
OCEANS >OCEAN WAVES >WAVE FREQUENCY    [Definition]
OCEANS >OCEAN WAVES >WAVE PERIOD    [Definition]
OCEANS >OCEAN WINDS >WIND STRESS    [Definition]
CLIMATE INDICATORS >ATMOSPHERIC/OCEAN INDICATORS >TELECONNECTIONS >EL NINO SOUTHERN OSCILLATION (ENSO) >ENSO    [Definition]
BIOSPHERE >AQUATIC ECOSYSTEMS >PELAGIC HABITAT    [Definition]


ISO Topic Category
BIOTA
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
ELEVATION
OCEANS


Project
GLOBEC >Global Ocean Ecosystem Dynamics, IGBP    [Information]
IGBP >International Geosphere-Biosphere Programme    [Information]


Keywords
CHILE
CIRCULATION
COASTAL-TRAPPED WAVES
CURRENT METER MOORING
EL NINO
FONDAP-HUMBOLDT
GLOBEC
HUMBOLDT CURRENT SYSTEM
LA NINA
LONGSHORE CURRENTS
SEA LEVEL
TIME SERIES
WIND STRESS


Data Center
Estacion de Biologia Marina-Dichato, Universidad de Concepcion, Chile    [Information]
Data Center URL: http://www.udec.cl/carreras/bmarina.html

Data Center Personnel
Name: PROF. VICTOR A GALLARDO
Phone: +56 41 683247
Fax: +56 41 683902
Email: vgallar at udec.cl
Contact Address:
Fondap-Humboldt Program Office
Estacion de Biologia Marina-Dichato (EBMD)
Universidad de Concepcion
City: Concepcion
Country: Chile


Personnel
RUBEN ESCRIBANO
Role: INVESTIGATOR
Email: rescribano at uantof.cl
Contact Address:
University of Antofagasta
PO Box 170
City: Antofagasta
Country: Chile


GLOBEC IPO
Role: DIF AUTHOR
Phone: +44 (0)1752 633401
Fax: +44 (0)1752 633101
Email: globec at pml.ac.uk
Contact Address:
GLOBEC International Project Office
Plymouth Marine Laboratory
Prospect Place
City: Plymouth
Postal Code: PL1 3DH
Country: UK


Publications/References
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.

Sobarzo, M., D. Figueroa & L. Djurfeldt. Upwelling of subsurface
water into the rim of the Biobio submarine canyon as a response to
surface winds. Cont. Shelf Res.

Submitted

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.

In preparation

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.

Thesis

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.

Creation and Review Dates
DIF Creation Date: 2001-08-06
Last DIF Revision Date: 2005-04-19

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