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This data set contains tree ring data from three sites located about 25 km of the meteorological station at Mongu, Zambia. Data from about 50 individual trees are reported. In addition, chronologies (or site mean curves) that better represent common influences (e.g., in this study, the climatic signal) were developed for each site based on the individual data (Trouet, 2004; Trouet et al., 2001). The series covers a maximum of 46 years, although most series do not extend longer than 30 years. The data were collected during the SAFARI 2000 Dry Season Field Campaign of August 2000.

Ten to 23 samples were taken at each site. Brachystegia bakeriana was sampled at site 1, and Brachystegia spiciformis at sites 2 and 3. The vegetation at all sites underwent primitive harvesting for subsistence earlier the same year, thus samples could be taken from freshly cut trees and no living trees were cut. At all sites, samples consisted of full stem discs. Where possible, samples were taken at breast height (1.3 m) or slightly lower. Growth ring widths were measured to the nearest 0.01 mm using LINTAB equipment and TSAP software (Rinn and Jäkel, 1997). Four radii per sample disc were measured. Cross-dating and response function analyses were performed by routine dendrochronological techniques.

There are two files for each site, one containing integer values representing tree ring widths (raw data), and the other containing standardized values (chronologies), for each year. The data are stored as ASCII table files in comma-separated-value (.csv) format, with column headers.

Data Citation:

Cite this data set as follows:

Trouet, V. 2005. SAFARI 2000 Tree Ring Data, Mongu, Zambia, Dry Season 2000. Data set. Available on-line [] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/788.


Rinn, F. and S. Jäkel. 1997. TSAP Reference Manual. Heidelberg, Germany, 187 pp.

Trouet, V. 2004. The El Niño Southern Oscillation effect on Zambezian miombo vegetation: proxies from tree ring series and satellite-derived data. Ph.D. Dissertation, Katholieke Universiteit Leuven, Belgium.

Trouet, V., K. Haneca, P. Coppin, and H. Beeckman. 2001. Tree ring analysis of Brachystegia spiciformis and Isoberlinia tomentosa: evaluation of the ENSO-signal in the miombo woodland of eastern Africa. IAWA Journal, 22(4): 385-399.

Data Format:

There are two files for each site, one containing integer values representing tree ring widths (raw data files), and the other containing standardized values (chronology files), for each year. The tree ring widths are measured in 10 micron increments and the standardized values, detrended by a moving average, are unitless.

The column headings are the names of individual disc samples. These names were assigned to each disc after their inclusion in the Xylarium at the Royal Museum for Central Africa in Tervuren, Belgium. Every individual sample (tree stem disc) has an official registration number and this is the column heading. The rows are the years of tree ring width or chronology.

The data are stored as ASCII table files in comma-separated-value (.csv) format, with column headers. The site locations and file names are listed below:

Site Name Latitude
(deg S)
(deg E)
Date Raw Data &
Summary Files
Site 1 15°26'45" 23°19'05" August 2000 mongu_tree_ring_site1_chron.csv
Site 2 15°11'45" 23°15'28" August 2000 mongu_tree_ring_site2_chron.csv
Site 3 15°11'40" 23°15'50" August 2000 mongu_tree_ring_site3_chron.csv

Additional information about the study sites, methodology, and statistical analysis is found in the companion file:

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