Estimation of the along-shore flow in Peru-Chile Undercurrent
Entry ID: GLOBEC_047_CHL_011

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Summary
Abstract: Title: Estimation of the along-shore flow in the Peru-Chile
Undercurrent and its inter-annual seasonal and along-shore
variability.


The Humboldt Current system, bound by the steep continental slope
and narrow shelf of western South America, is one of the four major
Eastern Ocean Boundary Current systems of the world. Equator-ward
winds predominate during most of the year north of about 33S, driving
a large coastal upwelling system that extends from central Chile to
northern Peru. The large scale mean circulation and water properties
distribution is consistent, in general, with a Sverdrup balance, while
the physical coastal environment is dominated by the coastal
upwelling, the persistent subsurface pole-ward Peru-Chile Undercurrent
(PCU) and inter-annual variability related to El Nino-Southern
oscillation (ENSO) and intra-seasonal, remotely-forced coastal-trapped
waves.

During the last 3 years (1997-2000), current measurements from two
sites near 30S, started in 1991, continued with the support of the
FONDAP-Humboldt programme. The time-series will cover the period from
November 1991 to September 2000, including the 1991-92 and the strong
1997-98 El Nino, as well as the 1995-96 and the 1998-99 La Nina. One
recording current meter (RCM)is located in the deep ocean at about
150km off the coast in a water depth of ~4200m with 5 Aanderaa RCM's
located at 100m, 400m, 900m, 1900m and 3400m. The other mooring lays
over the slope at ~15km from the coast in a water depth of ~850m. The
latter line has 3 RCM's, at 220m, 450m and 750m. During 1998, a new
mooring (equipped with 3 Aanderaa RCM's located at 240m, 450m and 750m
depth and one upward looking ADCP situated at 120m) have been
maintained over the slope off northern Chile around 21S. In addition,
a hydrographic transect, extending about 170km offshore, near 30S, has
been occupied regularly twice a year since November 1991.

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
OCEANS >COASTAL PROCESSES >LONGSHORE CURRENTS    [Definition]
OCEANS >OCEAN ACOUSTICS >ACOUSTIC SCATTERING >ADCP    [Definition]
OCEANS >OCEAN CIRCULATION >OCEAN CURRENTS    [Definition]
OCEANS >OCEAN CIRCULATION >UPWELLING/DOWNWELLING    [Definition]
OCEANS >OCEAN CIRCULATION >WIND-DRIVEN CIRCULATION    [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
OCEANS


Platform
ERS-1 >European Remote Sensing Satellite-1    [Information]
ERS-2 >European Remote Sensing Satellite-2    [Information]


Instrument
CURRENT METERS    [Information]
ADCP >Acoustic Doppler Current Profiler    [Information]


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


Keywords
GLOBEC
Chile
FONDAP-Humboldt
Humboldt Current System
Eastern Ocean Boundary Current
variability
El Nino
upwelling
current measurements
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
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


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


Publications/References
Published and In press
Shaffer, G., S. E. Hormazabal, O. Pizarro, & S. Salinas,
1999. Seasonal and interannual variability of currents and
temperature off central Chile. J. Geoph.. 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. (In press).

In preparation

Pizarro, O., G. Shaffer & O. Ulloa. Interannual changes
in the Peru-Chile Undercurrent. To be submitted to J.
Geophys. Res.

Other publications

Pizarro, O., 1999. Low frequency fluctuations in the
Eastern Boundary Current off South America: Remote and
local forcing. Ph.D. Thesis, Gvteborg University, Sweden,
1999.

Creation and Review Dates
DIF Creation Date: 2001-10-15
Last DIF Revision Date: 2007-09-19

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