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Knowledge of the net longwave radiation (BOL) is important for determining the energy exchange that occur in surface-atmosphere system. Thus, this work evaluated the seasonal Variabilidade estacional do balanço de ondas longas em um ecossistema de Mata Atlântica no estado de Alagoas-Brasil Misael Ferreira dos Santos Carlos Alexandre Santos Querino Jeová Ramos da Silva Junior Rayonil Gomes Carneiro José Marcelo Lopes Júnior Marcos Antonio Lima Moura Caminhos de Geografia Uberlândia-MG v. 21, n. 75 Jun/2020 p. 201–213 Página 202 variability of BOL in an area of Atlantic Forest, through the analysis of the influence of different meteorological variables, discussing their possible causes. The research was performed in the Private Reserve of the Natural Patrimony (RPPN), county of Coruripe-AL. The measurements were made by a net radiometer (CNR1, Kipp and Zone) installed above the forest canopy in a 26 meter high micrometeorological tower during the periods from 03.11.2016 to 31.12.2016 (dry season) and 01.05.2017 to 30.06.2017 (rainy season). The BOL ranged from 101.63% from rainy to dry season (-11.6 W.m to -23.39 W.m) on cloudy days and 30.33% (-49.19 W.m to -64.11 W.m) on clear days. The average of atmospheric longwave radiation (Ra) in the rainy season was 430.96 W.m and 418.90 W.m in the dry season while terrestrial radiation (Rs) was 456.46 W.m (rainy) and 470.60 W.m (dry). Rs was always higher than Ra, and therefore the BOL was always negative in both seasons, with an average difference of 103.19% from one season to another.

VARIABILIDADE ESTACIONAL DO BALANÇO DE ONDAS LONGAS EM UM ECOSSISTEMA DE MATA ATLÂNTICA NO ESTADO DE ALAGOAS-BRASIL