Browsing by Autor "Alfredo Ronald Veizaga Medina"

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Datos meteorológicos comparativos en las cuencas de río Mauri y Coroico, en relacióna datos satelitales
(Selva Andina Research Society, 2025) Alfredo Ronald Veizaga Medina
In some stations in Bolivia, there are no meteorological data or they are incomplete, to carry out various studies including the water balance in basins such as the Mauri and Coroico, an alternative is the data from satellites that are available and were reanalyzed, before using them, comparisons and analysis must be made based on the stations in situ, to use them directly or make some adjustment. Internationally, there are several studies on the comparison of meteorological data measured at stations with satellite data. Previous studies in Bolivia indicated that data from the Climate Forecast System Re-analysis, which uses the Water and Soil Assessment Tool model from satellites, is acceptable for mean and minimum temperature, and in the Katari Basin they used satellite precipitation data to adjust for gaps at some stations. In this research, meteorological data (maximum and minimum temperature and precipitation) were obtained from the National Meteorological and Hydrological Service of Peru and Bolivia, for the stations of Chuapalca and Calacoto, located in the Mauri river basin, and Caranavi in the Coroico river basin. The data were statistically compared, using the Nash Sutcliffe coefficient of adequacy, percentage bias (PBIAS), and r = CoC (Pearson's correlation coefficient), with mete-orological data obtained from NASA (National Aeronautics and Space Administration of the United States of America). The result shows that NASA data are reliable mainly for maximum and minimum temperatures with acceptable correlation coefficients above 0.4. However, for precipitation, they overestimate or underestimate the data measured by SENAMHI, most likely because satellite-estimated precipitation is affected by several factors such as atmospheric humidity, topography, mountains, and the El Niño and La Niña phenomena. It was concluded that for the Mauri basin in the Altiplano, the re-analyzed satellite data could be used directly, however, precipitation adjustments should be made before using them. On the other hand, for the Coroico river basin at the Caranavi station, adjustments should be made using techniques such as regression or others before using the re-analyzed satellite temperatures and precipitation.