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SOFTWARE

MarkSim

Software to Generate Daily Weather Data for Latin America and Africa

^a Centro Internacional de Agricultura Tropical (CIAT), AA6713, Cali, Colombia
^b Int. Livestock Research Inst. (ILRI), P.O. Box 30709, Nairobi, Kenya

p.jones{at}cgiar.org

A software package to generate daily weather data for Latin America and Africa is described. The program is based on a stochastic weather generator that uses a third-order Markov process to model daily weather data. The model has been fitted to data from more than 9200 stations with long runs of daily data throughout the world. The climate normals for these stations were assembled into 664 groups using a clustering algorithm. For each of these groups, rainfall model parameters are predicted from monthly means of rainfall, air temperature, diurnal temperature range, and station elevation and latitude. The program identifies the cluster relevant to any required point using interpolated climate surfaces at a resolution of 10 min of arc (18 km²) and evaluates the model parameters for that point. The application currently contains surfaces for Latin America and Africa, and other regions will later be added. Use of the software is demonstrated by generating daily weather data files for running one of the DSSAT crop models.

Abbreviations: CD-ROM, compact disk–read-only memory • CGIAR, Consultative Group on International Agricultural Research • CIAT, Centro Internacional de Agricultura Tropical • CPU, central processing unit • DSSAT, decision support system for agrotechnology transfer • ICASA, International Consortium for Agricultural Systems Applications • ILRI, International Livestock Research Institute