Long-term measurements of aerosol optical properties and radiative forcing (2011-2017) over Central Amazonia

Author(s):Show less -

Rafael da Silva Palácios ^[1] ; Paulo Artaxo ^[2] ; Glauber Guimarães Cirino ^[3] ; Valeria Nakale ^[4] ; Fernando Gonçalves de Morais ^[5] ; Lucas Douglas Rothmund ^[6] ; Marcelo Sacardi Biudes ^[7] ; Nadja Gomes Machado ^[8] ; Leone Francisco Amorim Curado ^[9] ; João Basso Marques ^[10] ; José de Souza Nogueira ^[11]

Affiliation:Show less -

^[1] Federal University of Pará - Brasil

^[2] University of São Paulo - Brasil

^[3] Federal University of Pará - Brasil

^[4] Federal University of Pará - Brasil

^[5] University of São Paulo - Brasil

^[6] University of Mato Grosso - Brasil

^[7] University of Mato Grosso - Brasil

^[8] Federal Institute of Mato Grosso - Brasil

^[9] University of Mato Grosso - Brasil

^[10] University of Mato Grosso - Brasil

^[11] University of Mato Grosso - Brasil

• Document type: Journal article
• Source: ATMOSFERA; v. 35, n. 1, p. 143-163, 2022-03-22.

Abstract

ABSTRACT The Amazon region is one of the most pristine continental areas whose concentrations of atmospheric trace gases and aerosol particles are very low, mainly in the wet season. This study provides observational results of aerosol optical and radiative characteristics in situ as well as atmospheric columnar at a pristine forest in Central Amazonia. Spectral variation of the aerosol properties (aerosol optical depth [AOD], single scattering albedo [SSA], and asymmetry parameter [AP]) was evaluated using the AErosol RObotic NETwork (AERONET) data. The SSA values under natural atmospheric column conditions (AERONET) were compared to the SSA values calculated with in situ measurements. The values of shortwave aerosol radiative forcing (SWARF) on top of the atmosphere (TOA) and the surface (SUR) were estimated using the SBDART model and were validated with the AERONET values with regression analysis. SWARF had a high correlation to TOA (0.97) and SUR (0.92), including dry and wet seasons. Monthly, seasonal and annual mean values of SWARFTOA and SWARFSUR were negative while SWARFATM values were positive. SWARFTOA was -9.18 ± 2.80 W m-2 and SWARFSUR was -20.77 ± 5.04 W m-2 in the dry season, inducing a heating rate (HR) of 0.37 ± 0.13 K.day-1. This study showed that, for a long series of measurements, the effects caused by aerosols on the radiative flux in the pristine forest of Central Amazonia were of the order of SWARFTOA of -3.66 ± 1.59 W m-2 and SWARFSUR of -11.86 ± 2.35 W m-2 during the wet season. (AU)

• FAPESP's process: 08/58100-2 - Aeroclima: direct and indirect effects of aerosols on climate in Amazonia and Pantanal
• Grantee: Paulo Eduardo Artaxo Netto
• Support Opportunities: Research Program on Global Climate Change - Thematic Grants
• FAPESP's process: 13/05014-0 - GoAmazon: interactions of the urban plume of Manaus with biogenic forest emissions in Amazonia
• Grantee: Paulo Eduardo Artaxo Netto
• Support Opportunities: Research Program on Global Climate Change - Thematic Grants