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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-88
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 May 2018

Research article | 30 May 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Aerosol Optical Depth retrievals in Central Amazonia from a Multi-Filter Rotating Shadow-band Radiometer on-site calibrated

Nilton E. Rosário1, Thamara Sauini1, Theotonio Pauliquevis1, Henrique M. J. Barbosa2, Marcia A. Yamasoe3, and Boris Barja4 Nilton E. Rosário et al.
  • 1Universidade Federal de São Paulo – Rua São Nicolau 210 – Diadema – SP – CEP 09913-030 – Brazil
  • 2Instituto de Física da Universidade de São Paulo – Rua do Matão 1371 – São Paulo – SP – CEP 05508 – 090 – Brazil
  • 3Instituto de Astronomia, Geofísica e Ciências Atmosféricas – Universidade de São Paulo – Rua do Matão 1226 – São Paulo – 8 SP – CEP 05508-090 – Brazil
  • 4Universidade de Magallanes – Manuel Bulnes 01855, Punta Arenas, Region de Magallanes y de la Antártica Chilena, Chile

Abstract. Extraterrestrial spectral response calibration of a Multi-Filter Rotating Shadow band Radiometer (MFRSR) under Amazonian Forest atmosphere pristine conditions using the Langley plot method was performed and evaluated. The MFRSR is installed in central Amazonia as part of a long-term monitoring site, which was used in the context of the GoAmazon2014/5 Experiment. It has been operating continuously since 2011 without regular extraterrestrial calibration, preventing its application to accurate monitoring of aerosol particles. Once calibrated, the MFRSR measurements were applied to retrieve aerosols particles columnar optical properties, specifically Aerosol Optical Depth (AODλ) and Ångström Exponent (AE), which were evaluated against retrievals from a collocated CIMEL sunphotometer belonging to the AErosol RObotic NETwork (AERONET). Results obtained revealed that Amazonian pristine conditions are able to provide MFRSR extraterrestrial spectral response with relative uncertainty lower than 1.0% at visible channels. The worst estimate (air mass=1) for absolute uncertainty in AODλ retrieval varied from ~0.02 to ~0.03, depending on the assumption regarding uncertainty for MFRSR direct-normal irradiance measured at the surface. Obtained Root Mean Square Errors (RMSE~0.025) from the evaluation of MFRSR retrievals against AERONET AODλ were, in general, lower than estimate MFRSR AODλ uncertainties, and close to AERONET field sunphotometers (~0.02).

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