Temperature trends at Camaguey, Cuba, after some volcanic eruptions

JUAN CARLOS ANTUÑA, ISMAEL POMARES, RENÉ ESTEVAN

Abstract

Temperature trends in the three years following the volcanic eruptions of Agung, El Chichón and Pinatubo are studied, employing monthly mean temperature data from four meteorological stations of the Meteorological Poligon of Camaguey (PMC). A descendent tendency was found for monthly mean temperature following those eruptions In general the trends in the three years following the eruptions are different, at a significative level of 99.5% from the trends of the entire data periods, revealing the cooling effects of those eruptions. Also in the Agung and El Chichón case the trends were significatively different at a 90% level, from the null trends. Different cooling effects between Pinatubo eruption and Agung and El Chichon eruptions are explained by the particularities of the movement of the stratospheric aerosols plume of the first, occasioned by the different epochs of the year in wich Pinatubo erupted respect to Agung and El Chichón. The evaluation of the temperature anomalies registered in the PMC in the year following the eruptions show a most intense cooling than in the Northern Hemisphere as a whole, reinforcing the hypothesis of the particular acentuate response of the PMC and probably for an island as Cuba to the shadowing of solar radiation by stratospheric aerosols, as result of its particular thermal insulation occasioned by the notable difference between the thermal capacities of the land and sea.

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