Aerosol optical depth retrievals in central Amazonia from a multi-filter rotating shadow-band radiometer calibrated on-site
| dc.contributor.author | Rosário, Nilton E. | |
| dc.contributor.author | Sauini, Thamara | |
| dc.contributor.author | Pauliquevis, Theotonio | |
| dc.contributor.author | Barbosa, H. M. J. | |
| dc.contributor.author | Yamasoe, Marcia A. | |
| dc.contributor.author | Barja, Boris | |
| dc.date.accessioned | 2024-06-28T18:10:21Z | |
| dc.date.available | 2024-06-28T18:10:21Z | |
| dc.date.issued | 2019-02-11 | |
| dc.description.abstract | Extraterrestrial spectral response calibration of a multi-filter rotating shadow band radiometer (MFRSR) under pristine Amazonian Forest atmosphere conditions was performed using the Langley plot method. 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 aerosol particle columnar optical properties, specifically aerosol optical depth (AODλ) and Ångström exponent (AE), which were evaluated against retrievals from a collocated Cimel Sun photometer belonging to the AErosol RObotic NETwork (AERONET). Results obtained revealed that pristine Amazonian conditions are able to provide MFRSR extraterrestrial spectral response with relative uncertainty lower than 1.0 % in 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. The obtained root mean square error (RMSE ≈0.025) from the evaluation of MFRSR retrievals against AERONET AODλ was, in general, lower than estimated MFRSR AODλ uncertainty, and close to the uncertainty of AERONET field Sun photometers (≈0.02). | |
| dc.description.sponsorship | The authors would like to thank EMBRAPA, INPA, and the LBA Central office for logistical support. Special thanks to Marcelo Rossi, Victor Souza, and Jocivaldo Souza at EMBRAPA, and to Ruth Araujo, Roberta Souza, Bruno Takeshi, and Glauber Cirino from LBA. Henrique Barbosa acknowledges the financial support from FAPESP Research Program on Global Climate Change under research grants 2008/58100-1, 2012/16100-1, 2013/50510-5, 2013/05014-0, and 2017/17047-0. Theotonio Pauliquevis acknowledges the financial support from CNPq research grant 458017/2013-2. Boris Barja acknowledges the financial support of CAPES project A016-2013 on the programme Science without Frontiers and the SAVERNET project. | |
| dc.description.uri | https://amt.copernicus.org/articles/12/921/2019/ | |
| dc.format.extent | 14 pages | |
| dc.genre | journal articles | |
| dc.identifier | doi:10.13016/m2nc6q-sjjl | |
| dc.identifier.citation | Rosário, Nilton E., Thamara Sauini, Theotonio Pauliquevis, Henrique M. J. Barbosa, Marcia A. Yamasoe, and Boris Barja. “Aerosol Optical Depth Retrievals in Central Amazonia from a Multi-Filter Rotating Shadow-Band Radiometer Calibrated on-Site.” Atmospheric Measurement Techniques 12, no. 2 (February 11, 2019): 921–34. https://doi.org/10.5194/amt-12-921-2019. | |
| dc.identifier.uri | https://doi.org/10.5194/amt-12-921-2019 | |
| dc.identifier.uri | http://hdl.handle.net/11603/34809 | |
| dc.language.iso | en_US | |
| dc.publisher | EGU | |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Physics Department | |
| dc.rights | CC BY 4.0 DEED Attribution 4.0 International | |
| dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
| dc.title | Aerosol optical depth retrievals in central Amazonia from a multi-filter rotating shadow-band radiometer calibrated on-site | |
| dc.type | Text | |
| dcterms.creator | https://orcid.org/0000-0002-4027-1855 |