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Long Term Analysis of Optical and Radiative Properties of Aerosols in the Amazon Basin

Category: Optical/Radiative Properties and Remote Sensing

Volume: 20 | Issue: 1 | Pages: 139-154
DOI: 10.4209/aaqr.2019.04.0189
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To cite this article:
Palácios, R.d.S., Romera, K.S., Curado, L.F.A., Banga, N.M., Rothmund, L.D., Sallo, F.d.S., Morais, D., Santos, A.C.A., Moraes, T.J., Morais, F.G., Landulfo, E., Franco, M.A.d.M., Kuhnen, I.A., Marques, J.B., Nogueira, J.d.S., Júnior, L.C.G.d.V. and Rodrigues, T.R. (2020). Long Term Analysis of Optical and Radiative Properties of Aerosols in the Amazon Basin. Aerosol Air Qual. Res. 20: 139-154. doi: 10.4209/aaqr.2019.04.0189.

Rafael da Silva Palácios 1, Kelly Sousa Romera1, Leone Francisco Amorim Curado1, Nelson Mario Banga1, Lucas Douglas Rothmund1, Fernando da Silva Sallo3, Denes Morais4, Anna Carolinna Albino Santos4, Tonny Jader Moraes1, Fernando Gonçalves Morais5, Eduardo Landulfo5, Marco Aurélio de Menezes Franco6, Igor Antonio Kuhnen1, João Basso Marques1, José de Souza Nogueira1, Luiz Claudio Galvão do Valle Júnior2, Thiago Rangel Rodrigues2

  • 1 Federal University of Mato Grosso (UFMT), Cuiabá 78060-900, Brazil
  • 2 Federal University of Mato Grosso do Sul (UFMS), Campo grande 79070-900, Brazil
  • 3 University of Cuiaba (UNIC), Cuiabá 78065-900, Brazil
  • 4 University of Varzea Grande (UNIVAG), Cuiabá 78118-900, Brazil
  • 5 Instituto of Research Energy and Nuclear (IPEN), São Paulo 05508-000, Brazil
  • 6 University of São Paulo (USP), São Paulo 05508-090, Brazil

Highlights

  • In Amazon, AOD 500 nm has experienced a growing trend since the year 2013.
  • Maximum of AOD 500 nm occur during the dry season, due to biomass burning.
  • The use and soil occupation interfered on scattering and absorption processes.
  • OC fraction at dry cycle produce instantaneous effects up to –100 Wm–2 in FR-Surface.
  • Impact of biogenic particles on radiative flux denote 45% of effects aerosol.

Abstract

The Amazon region is an excellent laboratory for analysis of natural aerosols in the wet season; however, in the dry season the biomass burning emissions highly influence it, which considerably alters the physical and chemical properties of the atmosphere. We analyzed long-term time series (2000–2017) of optical and radiative properties of aerosols during dry and rain seasons from nine AERONET stations located in the Amazon Basin (Western Brazil). Aerosols have been classified into two groups: organic carbon (OC) and elemental carbon (EC), which allowed quantification of their effects on the radiative forcing for these sites. It was possible to conclude that the optical depth values of aerosols (AOD 500 nm), which remained in a downward inclination beginning in 2010 to 2012, returned to rise since 2013. The analysis showed that the fraction of biogenic particles varied from approximately 38% to 67% at the site of Manaus EMBRAPA. However, for ATTO this fraction remained practically constant throughout the year, around 68% as the fraction of OC-EC went from approximately 16 to 27%. In that way, the study found that in the central Amazon region, in the dry season, the OC fraction generates instantaneous effects of up to –100 W m–2 in the radiative surface forcing (FR-Surface), while in the Cerrado region (Cuiabá) the instantaneous values reached up to –350 W m–2. The impact of the primary biogenic particles on the radiative flux resulted in a mean, approximately –20 W m–2 FR-Surface, representing 45% of the total effect caused by aerosols in the Amazon.

Keywords

Aerosol optical depth Single scattering albedo Angstrom matrix


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