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      Influence of Atmospheric Aerosols on Evapotranspiration over a Semiarid Region in Northeast Brazil Translated title: Influência de Aerossóis Atmosféricos na Evapotranspiração de uma Região Semiárida no Nordeste do Brasil

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          Abstract

          Abstract The knowledge of atmospheric aerosol characteristics at regional and local scales, their temporal changes and interrelations with meteorological variables are of great importance because can modify the global radiative energy balance. This study was carried out to evaluate the influence of aerosols on evapotranspiration over a semiarid region in Northeast Brazil. Aerosol optical depth, global solar radiation, air temperature, air relative humidity, and wind speed were measured in the Research National Center of Semiarid, located at Petrolina, Pernambuco State, Brazil, along two consecutive years. A multivariate model was calibrated and validated for estimating the global solar radiation (Rglobal) based on the aerosol optical depths (AOD) and extraterrestrial solar radiation (R0). Estimates of the reference evapotranspiration (ET0) were obtained by using the FAO standard Penman-Monteith method. Results confirmed that larger aerosol optical depth tends to decrease both Rglobal and ET0. Otherwise, ticker aerosol optical depth tends to absorb less radiation, increasing the ET0. For the semiarid region in Northeast Brazil, most of ET0 deviations were smaller than ±4%. However, higher deviations were also observed, contributing jointly to around 30%, which may result in relevant consequences on the irrigation management, water balance, agroclimatic zoning, among other activities based on the ET0 estimates.

          Translated abstract

          Resumo O conhecimento das características de aerossóis atmosféricos nas escalas local e regional, suas modificações temporais e inter-relações com as variáveis meteorológicas são de grande importância, pois podem modificar o balanço de energia radiativa global. Esse estudo foi realizado para avaliar a influência de aerossóis na evapotranspiração de uma região semiárida no Nordeste do Brasil. Profundidade ótica de aerossol, radiação solar global, temperatura, umidade e velocidade do ar foram medidas na Embrapa Semiárido, localizada em Petrolina, PE, durante dois anos consecutivos. Um modelo multivariado foi calibrado e validado para estimar a radiação solar global (Rglobal) com base em profundidades óticas de aerossóis (AOD) e radiação solar extraterrestre (R0). Estimativas da evapotranspiração de referência (ET0) foram obtidas pelo método de Penman-Monteith FAO. Os resultados confirmaram que maiores profundidades óticas de aerossóis tendem a diminuir a Rglobal e ET0. Ao contrário, menores profundidades óticas de aerossóis tendem a absorver menos radiação, aumentando a ET0. Para a região semiárida no Nordeste, a maioria dos desvios de ET0 foi menor que ±4%. Entretanto, maiores desvios foram também observados, contribuindo em torno de 30%, o que pode resultar em consequências relevantes no manejo de irrigação, balanço hídrico, zoneamento agroclimático, dentre outras atividades baseadas em estimativas de ET0.

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          Most cited references 20

          • Record: found
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          AERONET—A Federated Instrument Network and Data Archive for Aerosol Characterization

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            An emerging ground-based aerosol climatology: Aerosol optical depth from AERONET

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              • Record: found
              • Abstract: not found
              • Article: not found

              Advantages of diffuse radiation for terrestrial ecosystem productivity

                Bookmark

                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                rbmet
                Revista Brasileira de Meteorologia
                Rev. bras. meteorol.
                Sociedade Brasileira de Meteorologia (São Paulo, SP, Brazil )
                0102-7786
                1982-4351
                December 2018
                : 33
                : 4
                : 677-683
                Affiliations
                Sete Lagoas MG orgnameUniversidade Federal de São João del-Reia orgdiv1Departamento de Ciências Agrárias Brasil
                Article
                S0102-77862018000400677
                10.1590/0102-7786334009

                This work is licensed under a Creative Commons Attribution 4.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 29, Pages: 7
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