Aerosol optical depth retrievals in central Amazonia from a multi-filter rotating shadow-band radiometer calibrated on-site
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 use...
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ftdoajarticles:oai:doaj.org/article:907b7954e082429bada6f83788792f05 2023-05-15T13:06:16+02:00 Aerosol optical depth retrievals in central Amazonia from a multi-filter rotating shadow-band radiometer calibrated on-site N. E. Rosário T. Sauini T. Pauliquevis H. M. J. Barbosa M. A. Yamasoe B. Barja 2019-02-01T00:00:00Z https://doi.org/10.5194/amt-12-921-2019 https://doaj.org/article/907b7954e082429bada6f83788792f05 EN eng Copernicus Publications https://www.atmos-meas-tech.net/12/921/2019/amt-12-921-2019.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-12-921-2019 1867-1381 1867-8548 https://doaj.org/article/907b7954e082429bada6f83788792f05 Atmospheric Measurement Techniques, Vol 12, Pp 921-934 (2019) Environmental engineering TA170-171 Earthwork. Foundations TA715-787 article 2019 ftdoajarticles https://doi.org/10.5194/amt-12-921-2019 2022-12-31T02:09:31Z 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 (AOD λ ) 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 AOD λ 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 AOD λ was, in general, lower than estimated MFRSR AOD λ uncertainty, and close to the uncertainty of AERONET field Sun photometers ( ≈0.02 ). Article in Journal/Newspaper Aerosol Robotic Network Directory of Open Access Journals: DOAJ Articles Atmospheric Measurement Techniques 12 2 921 934 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
spellingShingle |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 N. E. Rosário T. Sauini T. Pauliquevis H. M. J. Barbosa M. A. Yamasoe B. Barja Aerosol optical depth retrievals in central Amazonia from a multi-filter rotating shadow-band radiometer calibrated on-site |
topic_facet |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
description |
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 (AOD λ ) 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 AOD λ 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 AOD λ was, in general, lower than estimated MFRSR AOD λ uncertainty, and close to the uncertainty of AERONET field Sun photometers ( ≈0.02 ). |
format |
Article in Journal/Newspaper |
author |
N. E. Rosário T. Sauini T. Pauliquevis H. M. J. Barbosa M. A. Yamasoe B. Barja |
author_facet |
N. E. Rosário T. Sauini T. Pauliquevis H. M. J. Barbosa M. A. Yamasoe B. Barja |
author_sort |
N. E. Rosário |
title |
Aerosol optical depth retrievals in central Amazonia from a multi-filter rotating shadow-band radiometer calibrated on-site |
title_short |
Aerosol optical depth retrievals in central Amazonia from a multi-filter rotating shadow-band radiometer calibrated on-site |
title_full |
Aerosol optical depth retrievals in central Amazonia from a multi-filter rotating shadow-band radiometer calibrated on-site |
title_fullStr |
Aerosol optical depth retrievals in central Amazonia from a multi-filter rotating shadow-band radiometer calibrated on-site |
title_full_unstemmed |
Aerosol optical depth retrievals in central Amazonia from a multi-filter rotating shadow-band radiometer calibrated on-site |
title_sort |
aerosol optical depth retrievals in central amazonia from a multi-filter rotating shadow-band radiometer calibrated on-site |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/amt-12-921-2019 https://doaj.org/article/907b7954e082429bada6f83788792f05 |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Atmospheric Measurement Techniques, Vol 12, Pp 921-934 (2019) |
op_relation |
https://www.atmos-meas-tech.net/12/921/2019/amt-12-921-2019.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-12-921-2019 1867-1381 1867-8548 https://doaj.org/article/907b7954e082429bada6f83788792f05 |
op_doi |
https://doi.org/10.5194/amt-12-921-2019 |
container_title |
Atmospheric Measurement Techniques |
container_volume |
12 |
container_issue |
2 |
container_start_page |
921 |
op_container_end_page |
934 |
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1765998844470886400 |