Climatological Effects of Aerosols on the Energy Balance in a Transition Region of the Legal Amazon
DOI:
https://doi.org/10.26848/rbgf.v18.6.p4513-4530Keywords:
Aerosols, Optical Depth, Energy Balance, Bowen Ratio Method, Global RadiationAbstract
This study conducted a comparative analysis of energy balances under different atmospheric conditions, specifically differentiating between clear-sky conditions, defined as AOD ≤ 0.15, and aerosol-laden conditions, defined as AOD > 0.15. The Bowen Ratio Method was employed to estimate the energy balance, utilizing in situ meteorological data, including air temperature (T), relative humidity (RH), soil heat flux (G), and net radiation (Rn). A fourth-order polynomial regression was then applied to the hourly values of these variables to facilitate estimations under clear-sky conditions. Additionally, the clearness index (kt) was calculated for both clear-sky and aerosol conditions. The hourly analysis revealed that AOD values exceeding 0.15 are associated with modifications in the energy balance. A trend of decreased net radiation (Rn) was observed, indicating a negative impact on the energy available for the components of the radiation balance. Concerning the fluxes derived from the Bowen Ratio Method, an inverse relationship between latent heat flux (LE) and sensible heat flux (H) was detected. Under aerosol conditions, LE exhibited higher values, whereas H and soil heat flux (G) demonstrated lower values, suggesting a redistribution of available energy compared to clear-sky atmospheric conditions.
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Copyright (c) 1969 Leilane Duarte, Rafael Palácios, Leone Francisco Amorim Curado

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