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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

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

Bamber, J.L., S. Ekholm, W.B. Krabill. 2000. A new, high-resolution digital elevation model of Greenland fully validated with airborne laser altimeter data. Journal of Geophysical Research. In press. Bamber, J.L., R.L. Layberry, S.P. Gogenini. 2000. A new ice thickness and bedrock dataset for the Greenland ice sheet: part I. Journal of Geophysical Research. In press. Bamber, J.L., Ekholm, S., and Krabill, W. B. 1998. The accuracy of satellite radar altimeter data over the Greenland ice sheet determined from airborne laser data, Geophysical Research Letters. 25(16): 3177-3180. Bamber, J.L. and R.A. Bindschadler. 1997. An improved elevation dataset for climate and ice-sheet modelling: validation with satellite imagery. Annals of Glaciology 25:438-444. Bamber, J.L. and P. Huybrechts. 1996. Geometric boundary conditions for modelling the velocity field of the Antarctic ice sheet. Annals of Glaciology 23:364-373. Bamber, J. and C. Bentley. 1994. A comp
arison of satellite-altimetry and ice thickness measurements of the Ross Ice Shelf, Antarctica. Annals of Glaciology 20:357-364. Bamber, J. 1994. A digital elevation model of the Antarctic ice sheet derived from ERS-1 altimeter data and comparison with terrestrial measurements. Annals of Glaciology 20:48-54. Bamber, J. 1994. Ice sheet altimeter processing scheme. International Journal of Remote Sensing 15:925-938. Bogorodskiy, V.V., C.R. Bentley, P.E. Gudmandsen. 1985. Radioglaciology. Dordrecht: D. Reidel Publishing Company. Brenner, A.C., R.A. Bindschadler, R.H. Thomas, H.J. Zwally. 1983. Slope-induced errors in radar altimetry over continental ice sheets. Journal of Geophysical Research 88:1617-1623. Davis C.H., H.J. Zwally. 1993. Geographic and seasonal variations in the surface properties of the ice sheets by satellite radar altimetry. Journal of Glaciology 39:687-697. Gogineni, S., D. Tammana, D. Braaten, C. Leuschen, T. Atkins, J. Legarsky, P. Kanagaratnam,
J. Stiles, C. Allen, and K. Jezek. 2000. Coherent radar ice thicknes
s measurements over the Greenland Ice Sheet. Journal of Geophysical Research. In press. Hodge, S.M., D.L. Wright, J.A. Bradley, R. W. Jacobel, N. Skou, and B. Vaughn. 1990. Determination of the surface and bed topography in central Greenland. Journal of Glaciology 36(122):17-30. Weng, W.L. 1995. Untitled. Arctic 48(2):206. Zwally, H.J., R.A. Bindschadler, A.C. Brenner, T.V. Martin, R.H. Thomas. 1983. Surface elevation contours of Greenland and Antarctic ice sheets. Journal of Geophysical Research 88(C3):1589-1596.

Creation and Review Dates

DIF Creation Date: 2001-02-22

Last DIF Revision Date: 2011-07-28

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