Aerosol optical depth comparison between GAW-PFR and AERONET-Cimel radiometers from long-term (2005–2015) 1 min synchronous measurements
A comprehensive comparison of more than 70 000 synchronous 1 min aerosol optical depth (AOD) data from three Global Atmosphere Watch precision-filter radiometers (GAW-PFR), traceable to the World AOD reference, and 15 Aerosol Robotic Network Cimel radiometers (AERONET-Cimel), calibrated individually...
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ftdoajarticles:oai:doaj.org/article:b0b0b75b499f4ba7b8289780190e701c 2023-05-15T13:07:11+02:00 Aerosol optical depth comparison between GAW-PFR and AERONET-Cimel radiometers from long-term (2005–2015) 1 min synchronous measurements E. Cuevas P. M. Romero-Campos N. Kouremeti S. Kazadzis P. Räisänen R. D. García A. Barreto C. Guirado-Fuentes R. Ramos C. Toledano F. Almansa J. Gröbner 2019-08-01T00:00:00Z https://doi.org/10.5194/amt-12-4309-2019 https://doaj.org/article/b0b0b75b499f4ba7b8289780190e701c EN eng Copernicus Publications https://www.atmos-meas-tech.net/12/4309/2019/amt-12-4309-2019.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-12-4309-2019 1867-1381 1867-8548 https://doaj.org/article/b0b0b75b499f4ba7b8289780190e701c Atmospheric Measurement Techniques, Vol 12, Pp 4309-4337 (2019) Environmental engineering TA170-171 Earthwork. Foundations TA715-787 article 2019 ftdoajarticles https://doi.org/10.5194/amt-12-4309-2019 2022-12-31T06:01:22Z A comprehensive comparison of more than 70 000 synchronous 1 min aerosol optical depth (AOD) data from three Global Atmosphere Watch precision-filter radiometers (GAW-PFR), traceable to the World AOD reference, and 15 Aerosol Robotic Network Cimel radiometers (AERONET-Cimel), calibrated individually with the Langley plot technique, was performed for four common or “near” wavelengths, 380, 440, 500 and 870 nm, in the period 2005–2015. The goal of this study is to assess whether, despite the marked technical differences between both networks (AERONET, GAW-PFR) and the number of instruments used, their long-term AOD data are comparable and consistent. The percentage of data meeting the World Meteorological Organization (WMO) traceability requirements (95 % of the AOD differences of an instrument compared to the WMO standards lie within specific limits) is >92 % at 380 nm, >95 % at 440 nm and 500 nm, and 98 % at 870 nm, with the results being quite similar for both AERONET version 2 (V2) and version 3 (V3). For the data outside these limits, the contribution of calibration and differences in the calculation of the optical depth contribution due to Rayleigh scattering and O 3 and NO 2 absorption have a negligible impact. For AOD >0.1 , a small but non-negligible percentage ( ∼1.9 %) of the AOD data outside the WMO limits at 380 nm can be partly assigned to the impact of dust aerosol forward scattering on the AOD calculation due to the different field of view of the instruments. Due to this effect the GAW-PFR provides AOD values, which are ∼3 % lower at 380 nm and ∼ 2 % lower at 500 nm compared with AERONET-Cimel. The comparison of the Ångström exponent (AE) shows that under non-pristine conditions (AOD >0.03 and AE <1 ) the AE differences remain <0.1 . This long-term comparison shows an excellent traceability of AERONET-Cimel AOD with the World AOD reference at 440, 500 and 870 nm channels and a fairly good agreement at 380 nm, although AOD should be improved in the UV range. Article in Journal/Newspaper Aerosol Robotic Network Directory of Open Access Journals: DOAJ Articles Atmospheric Measurement Techniques 12 8 4309 4337 |
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 E. Cuevas P. M. Romero-Campos N. Kouremeti S. Kazadzis P. Räisänen R. D. García A. Barreto C. Guirado-Fuentes R. Ramos C. Toledano F. Almansa J. Gröbner Aerosol optical depth comparison between GAW-PFR and AERONET-Cimel radiometers from long-term (2005–2015) 1 min synchronous measurements |
topic_facet |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
description |
A comprehensive comparison of more than 70 000 synchronous 1 min aerosol optical depth (AOD) data from three Global Atmosphere Watch precision-filter radiometers (GAW-PFR), traceable to the World AOD reference, and 15 Aerosol Robotic Network Cimel radiometers (AERONET-Cimel), calibrated individually with the Langley plot technique, was performed for four common or “near” wavelengths, 380, 440, 500 and 870 nm, in the period 2005–2015. The goal of this study is to assess whether, despite the marked technical differences between both networks (AERONET, GAW-PFR) and the number of instruments used, their long-term AOD data are comparable and consistent. The percentage of data meeting the World Meteorological Organization (WMO) traceability requirements (95 % of the AOD differences of an instrument compared to the WMO standards lie within specific limits) is >92 % at 380 nm, >95 % at 440 nm and 500 nm, and 98 % at 870 nm, with the results being quite similar for both AERONET version 2 (V2) and version 3 (V3). For the data outside these limits, the contribution of calibration and differences in the calculation of the optical depth contribution due to Rayleigh scattering and O 3 and NO 2 absorption have a negligible impact. For AOD >0.1 , a small but non-negligible percentage ( ∼1.9 %) of the AOD data outside the WMO limits at 380 nm can be partly assigned to the impact of dust aerosol forward scattering on the AOD calculation due to the different field of view of the instruments. Due to this effect the GAW-PFR provides AOD values, which are ∼3 % lower at 380 nm and ∼ 2 % lower at 500 nm compared with AERONET-Cimel. The comparison of the Ångström exponent (AE) shows that under non-pristine conditions (AOD >0.03 and AE <1 ) the AE differences remain <0.1 . This long-term comparison shows an excellent traceability of AERONET-Cimel AOD with the World AOD reference at 440, 500 and 870 nm channels and a fairly good agreement at 380 nm, although AOD should be improved in the UV range. |
format |
Article in Journal/Newspaper |
author |
E. Cuevas P. M. Romero-Campos N. Kouremeti S. Kazadzis P. Räisänen R. D. García A. Barreto C. Guirado-Fuentes R. Ramos C. Toledano F. Almansa J. Gröbner |
author_facet |
E. Cuevas P. M. Romero-Campos N. Kouremeti S. Kazadzis P. Räisänen R. D. García A. Barreto C. Guirado-Fuentes R. Ramos C. Toledano F. Almansa J. Gröbner |
author_sort |
E. Cuevas |
title |
Aerosol optical depth comparison between GAW-PFR and AERONET-Cimel radiometers from long-term (2005–2015) 1 min synchronous measurements |
title_short |
Aerosol optical depth comparison between GAW-PFR and AERONET-Cimel radiometers from long-term (2005–2015) 1 min synchronous measurements |
title_full |
Aerosol optical depth comparison between GAW-PFR and AERONET-Cimel radiometers from long-term (2005–2015) 1 min synchronous measurements |
title_fullStr |
Aerosol optical depth comparison between GAW-PFR and AERONET-Cimel radiometers from long-term (2005–2015) 1 min synchronous measurements |
title_full_unstemmed |
Aerosol optical depth comparison between GAW-PFR and AERONET-Cimel radiometers from long-term (2005–2015) 1 min synchronous measurements |
title_sort |
aerosol optical depth comparison between gaw-pfr and aeronet-cimel radiometers from long-term (2005–2015) 1 min synchronous measurements |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/amt-12-4309-2019 https://doaj.org/article/b0b0b75b499f4ba7b8289780190e701c |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Atmospheric Measurement Techniques, Vol 12, Pp 4309-4337 (2019) |
op_relation |
https://www.atmos-meas-tech.net/12/4309/2019/amt-12-4309-2019.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-12-4309-2019 1867-1381 1867-8548 https://doaj.org/article/b0b0b75b499f4ba7b8289780190e701c |
op_doi |
https://doi.org/10.5194/amt-12-4309-2019 |
container_title |
Atmospheric Measurement Techniques |
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12 |
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8 |
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4309 |
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4337 |
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1766038803814809600 |