Quaternary of South America and Antarctic Peninsula 1983 by Jorge Rabassa

Author:Jorge Rabassa [Rabassa, Jorge]
Language: eng
Format: epub
ISBN: 9789061915133
Barnesnoble:
Publisher: Taylor & Francis
Published: 1983-01-01T00:00:00+00:00

LONG-TERM STREAMFLOW RECONSTRUCTION FOR THE ATUEL RIVER

Between 1972 and 1978 a large number of tree-ring site collections were made on both sides of the Andean Cordillera in Argentina and Chile, and ring-width chronologies were developed for 32 of these sites, as part of a chronology development project covering the temperate forests of the Southern Hemisphere, (La Marche et al., 1979).

Four chronologies were derived from sites on the western side of the Cordillera in Chile between 32 °40’ and 35°00’ south latitude. Since no trees useful for chronology developnent grow on the eastern slopes of the Cordillera at these latitudes, these site chronologies are the closest existing dendrochronological records to the Atuel River basin in Mendoza province, Argentina, for which a runoff reconstruction was to be made.

Streamflow reconstruction was carried out following the method of Stockton (1975). The tree-ring data grid employed in the analysis consisted of three of the abovementioned chronologies (the shortest was Omited), each with lags of from zero to three years. Runoff data used for calibration were the total annual flow of the river measured at El Sosneado gaging station from 1922 to 1972 (51 years), (Agua y Energía, 1981).

A least squares analysis of these data yielded the following reconstruction equation:

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