Abstract

UGALDE, Kendall; J. ALFARO, Eric; G. HIDALGO, Hugo  and  MALDONADO, Tito. Caracterización climática de la lluvia del Pacífico Norte de Costa Rica usando análogos construidos. Tecnología en Marcha [online]. 2024, vol.37, n.4, pp.3-20. ISSN 0379-3982.  http://dx.doi.org/10.18845/tm.v37i4.6842.

The onset and demise of the rainy season (IELL and TELL, respectively in Spanish), also the duration of the dry and rainy seasons (DES and DELL, respectively in Spanish) are determined, with gridded precipitation data on Guanacaste for the period 1950-2020 constructed by coupling two data sets: 1) the dataset Climate Hazards group Infrared Precipitation with Stations (CHIRPS), and 2) the ERA5 reanalysis to which a downscaling method was applied to extend the data beyond the period covered by CHIRPS. Their IELL, TELL, DELL, and DES were characterized with statistics such as the median, standard deviation, interquartile range, and trends. In addition, were related to sources of climate variability such as El Niño Southern-Oscillation (ENSO), the sea surface temperature of the tropical north Atlantic (TNA) and the Caribbean Low-Level Jet (CLLJ). The dataset adequately represents the IELL, TELL, DELL, DES and the precipitations of the region, in addition to capturing the variability associated with the CLLJ and the coupling of the oceans (TNA-ENSO), but not that associated with the TNA and ENSO individually. Although it could not be determined if this is due to the ERA5 dataset or the downscaling method used, so it is recommended to verify if ERA5 captures such oceanic variability when performing the same analysis in a period of time from 1980-2020 where there is greater availability of observations such as meteorological gauge stations or CHIRPS that has already been validated.

Climate Variability, Downscaling, Guanacaste, Onset and demise of the rainy season, Rainy and dry season duration.

Keywords : Climate Variability; Downscaling; Guanacaste; Onset and demise of the rainy season; Rainy and dry season duration.

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