The Association between climate indexes and tropical cyclones in decadal rainfall in San Ramón, Costa Rica
Fecha
2023-12
Tipo
artículo original
Autores
Quesada Quesada, Marvin Elí
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Resumen
Se investiga la variabilidad decadal de la precipitación sobre San Ramón, Costa Rica (SR-CR) y su relación con los ı́ndices ONI y CLLJ, el AMO y la frecuencia de ciclones tropicales. Se aplican prue-bas de correlación entre los distintos ı́ndices con las ocho décadas de precipitación en San Ramón, La precipitación decadal muestra que las más secas fueron 1960-69 y 1980-89, y las más húmedas 1970-79 y 1990-99. Cada veinte años se produce un cambio climático de húmedo a seco o de seco a húme-do. Durante los eventos de El Niño (ONI) el Pacı́fico aumenta la temperatura de la superficie del mar (TSM) y disminuye las precipitaciones en SR-CR y durante La Niña, la TSM disminuye y tiende a llover más en SR-CR. Los valores bajos del CLLJ tienden a aumentar la incidencia de precipitaciones en la zona. La actividad ciclónica tiene una influencia apreciable en las precipitaciones en SR-CR, las dos primeras décadas hubo uno y dos ciclones. Sin embargo, el resto de las décadas mostraron más ciclones por década, como es el caso de 2010-19 con 8 ciclones. La relación entre el ı́ndice AMO y la precipitación en San Ramón tiene un desfase de 3 meses.
The decadal variability of precipitation over San Ramón, Costa Rica (SR-CR) and its relationship with the ONI, CLLJ, AMO indexes, and the frequency of tropical cyclones is investigated. Correlation tests are applied between the different indices with eight decades of precipitation in San Ramon. De-cadal precipitation shows that the driest were 1960-69 and 1980-89, and the wettest were 1970-79 and 1990-99. Every twenty years there is a climate change from wet to dry or dry to wet. During El Niño (ONI) events, the Pacific increases sea surface temperature (SST) and precipitation decreases in SR-CR and during La Niña, SST decreases and tends to rain more in SR-CR. Low values of the CLLJ tend to increase the incidence of precipitation in the area. Cyclonic activity has an appreciable influence on rainfall in SR-CR, the first two decades there were one and two cyclones. However, the rest of the decades showed more cyclones per decade, as is the case with 2010-19 with 8 cyclones. The relation-ship between the AMO index and precipitation in San Ramon has a 3-month lag.
The decadal variability of precipitation over San Ramón, Costa Rica (SR-CR) and its relationship with the ONI, CLLJ, AMO indexes, and the frequency of tropical cyclones is investigated. Correlation tests are applied between the different indices with eight decades of precipitation in San Ramon. De-cadal precipitation shows that the driest were 1960-69 and 1980-89, and the wettest were 1970-79 and 1990-99. Every twenty years there is a climate change from wet to dry or dry to wet. During El Niño (ONI) events, the Pacific increases sea surface temperature (SST) and precipitation decreases in SR-CR and during La Niña, SST decreases and tends to rain more in SR-CR. Low values of the CLLJ tend to increase the incidence of precipitation in the area. Cyclonic activity has an appreciable influence on rainfall in SR-CR, the first two decades there were one and two cyclones. However, the rest of the decades showed more cyclones per decade, as is the case with 2010-19 with 8 cyclones. The relation-ship between the AMO index and precipitation in San Ramon has a 3-month lag.
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variación multidecadal, ONI, CLLJ, AMO, ciclones tropicales, SAN RAMÓN (SAN RAMÓN, ALAJUELA, COSTA RICA), LLUVIA, PRECIPITACIÓN