Citas bibligráficas
Caillahua, M., (2021). Patrones de circulación asociados a descensos bruscos de temperatura mínima del aire en la Sierra Sur y Centro del Perú [Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/5113
Caillahua, M., Patrones de circulación asociados a descensos bruscos de temperatura mínima del aire en la Sierra Sur y Centro del Perú []. PE: Universidad Nacional Agraria La Molina; 2021. https://hdl.handle.net/20.500.12996/5113
@misc{renati/248976,
title = "Patrones de circulación asociados a descensos bruscos de temperatura mínima del aire en la Sierra Sur y Centro del Perú",
author = "Caillahua Argüelles, Martín Daniel",
publisher = "Universidad Nacional Agraria La Molina",
year = "2021"
}
In this research, minimum temperature abrupt drops (MTAD) events in central and southern Perú Andes were classified by circulation patterns using ERA 5 Reanalysis (0.25°x0.25°) with the aim of proposing at least one atmospheric conceptual model to identify these events. To make this classification, synoptic circulations and weather parameters were associated to MTAD events identified between 2009 and 2018, and then were explained by cuasigeostrophic omega equation and cuasi-geostrophic height-tendency equation. Results show the presence of a convergence (negative divergence) zone in high-level troposphere above the Pacific, in front of northern and central Chile, producing subsidence on that area and, therefore, a lower humidity content in troposphere. Southern winds in mid-level troposphere advect this dry air region (mean relative humidity between 600-300hPa layer lesser than 20%) from the Pacific towards southern and central Perú. Convergence zones are related to coupled jet streams on its convergent side, their location and configuration, whereas southern winds are mainly related to a ridge – trough system. In this research, it was also found a similar mechanism, but in this case the dry air region came from continent (Bolivia) and it mainly affected with MTAD over south eastern Perú Andes. Finally, isotherms maps are shown for a specific event (25th March 2018 to 8th April 2018). These maps were elaborated from minimum temperature data of weather stations and thermohygrometers (Tambos), and it can be identified that lowest values are located in high altitudes of the regions Tacna, Puno, Moquegua, Arequipa and Cusco.
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