A new zenith-looking narrow-band radiometer-based system (ZEN) for dust aerosol optical depth monitoring
A new zenith-looking narrow-band radiometer based system (ZEN), conceived for dust aerosol optical depth (AOD) monitoring, is presented in this paper. The ZEN system comprises a new radiometer (ZEN-R41) and a methodology for AOD retrieval (ZEN-LUT). ZEN-R41 has been designed to be stand alone and wi...
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ftdoajarticles:oai:doaj.org/article:b43108150b594437b3afdfe420c7148e 2023-05-15T13:06:57+02:00 A new zenith-looking narrow-band radiometer-based system (ZEN) for dust aerosol optical depth monitoring A. F. Almansa E. Cuevas B. Torres Á. Barreto R. D. García V. E. Cachorro Á. M. de Frutos C. López R. Ramos 2017-02-01T00:00:00Z https://doi.org/10.5194/amt-10-565-2017 https://doaj.org/article/b43108150b594437b3afdfe420c7148e EN eng Copernicus Publications http://www.atmos-meas-tech.net/10/565/2017/amt-10-565-2017.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 1867-1381 1867-8548 doi:10.5194/amt-10-565-2017 https://doaj.org/article/b43108150b594437b3afdfe420c7148e Atmospheric Measurement Techniques, Vol 10, Iss 2, Pp 565-579 (2017) Environmental engineering TA170-171 Earthwork. Foundations TA715-787 article 2017 ftdoajarticles https://doi.org/10.5194/amt-10-565-2017 2022-12-31T14:58:52Z A new zenith-looking narrow-band radiometer based system (ZEN), conceived for dust aerosol optical depth (AOD) monitoring, is presented in this paper. The ZEN system comprises a new radiometer (ZEN-R41) and a methodology for AOD retrieval (ZEN-LUT). ZEN-R41 has been designed to be stand alone and without moving parts, making it a low-cost and robust instrument with low maintenance, appropriate for deployment in remote and unpopulated desert areas. The ZEN-LUT method is based on the comparison of the measured zenith sky radiance (ZSR) with a look-up table (LUT) of computed ZSRs. The LUT is generated with the LibRadtran radiative transfer code. The sensitivity study proved that the ZEN-LUT method is appropriate for inferring AOD from ZSR measurements with an AOD standard uncertainty up to 0.06 for AOD 500 nm ∼ 0.5 and up to 0.15 for AOD 500 nm ∼ 1.0, considering instrumental errors of 5 %. The validation of the ZEN-LUT technique was performed using data from AErosol RObotic NETwork (AERONET) Cimel Electronique 318 photometers (CE318). A comparison between AOD obtained by applying the ZEN-LUT method on ZSRs (inferred from CE318 diffuse-sky measurements) and AOD provided by AERONET (derived from CE318 direct-sun measurements) was carried out at three sites characterized by a regular presence of desert mineral dust aerosols: Izaña and Santa Cruz in the Canary Islands and Tamanrasset in Algeria. The results show a coefficient of determination ( R 2 ) ranging from 0.99 to 0.97, and root mean square errors (RMSE) ranging from 0.010 at Izaña to 0.032 at Tamanrasset. The comparison of ZSR values from ZEN-R41 and the CE318 showed absolute relative mean bias (RMB) < 10 %. ZEN-R41 AOD values inferred from ZEN-LUT methodology were compared with AOD provided by AERONET, showing a fairly good agreement in all wavelengths, with mean absolute AOD differences < 0.030 and R 2 higher than 0.97. Article in Journal/Newspaper Aerosol Robotic Network Directory of Open Access Journals: DOAJ Articles Atmospheric Measurement Techniques 10 2 565 579 |
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Open Polar |
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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 A. F. Almansa E. Cuevas B. Torres Á. Barreto R. D. García V. E. Cachorro Á. M. de Frutos C. López R. Ramos A new zenith-looking narrow-band radiometer-based system (ZEN) for dust aerosol optical depth monitoring |
topic_facet |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
description |
A new zenith-looking narrow-band radiometer based system (ZEN), conceived for dust aerosol optical depth (AOD) monitoring, is presented in this paper. The ZEN system comprises a new radiometer (ZEN-R41) and a methodology for AOD retrieval (ZEN-LUT). ZEN-R41 has been designed to be stand alone and without moving parts, making it a low-cost and robust instrument with low maintenance, appropriate for deployment in remote and unpopulated desert areas. The ZEN-LUT method is based on the comparison of the measured zenith sky radiance (ZSR) with a look-up table (LUT) of computed ZSRs. The LUT is generated with the LibRadtran radiative transfer code. The sensitivity study proved that the ZEN-LUT method is appropriate for inferring AOD from ZSR measurements with an AOD standard uncertainty up to 0.06 for AOD 500 nm ∼ 0.5 and up to 0.15 for AOD 500 nm ∼ 1.0, considering instrumental errors of 5 %. The validation of the ZEN-LUT technique was performed using data from AErosol RObotic NETwork (AERONET) Cimel Electronique 318 photometers (CE318). A comparison between AOD obtained by applying the ZEN-LUT method on ZSRs (inferred from CE318 diffuse-sky measurements) and AOD provided by AERONET (derived from CE318 direct-sun measurements) was carried out at three sites characterized by a regular presence of desert mineral dust aerosols: Izaña and Santa Cruz in the Canary Islands and Tamanrasset in Algeria. The results show a coefficient of determination ( R 2 ) ranging from 0.99 to 0.97, and root mean square errors (RMSE) ranging from 0.010 at Izaña to 0.032 at Tamanrasset. The comparison of ZSR values from ZEN-R41 and the CE318 showed absolute relative mean bias (RMB) < 10 %. ZEN-R41 AOD values inferred from ZEN-LUT methodology were compared with AOD provided by AERONET, showing a fairly good agreement in all wavelengths, with mean absolute AOD differences < 0.030 and R 2 higher than 0.97. |
format |
Article in Journal/Newspaper |
author |
A. F. Almansa E. Cuevas B. Torres Á. Barreto R. D. García V. E. Cachorro Á. M. de Frutos C. López R. Ramos |
author_facet |
A. F. Almansa E. Cuevas B. Torres Á. Barreto R. D. García V. E. Cachorro Á. M. de Frutos C. López R. Ramos |
author_sort |
A. F. Almansa |
title |
A new zenith-looking narrow-band radiometer-based system (ZEN) for dust aerosol optical depth monitoring |
title_short |
A new zenith-looking narrow-band radiometer-based system (ZEN) for dust aerosol optical depth monitoring |
title_full |
A new zenith-looking narrow-band radiometer-based system (ZEN) for dust aerosol optical depth monitoring |
title_fullStr |
A new zenith-looking narrow-band radiometer-based system (ZEN) for dust aerosol optical depth monitoring |
title_full_unstemmed |
A new zenith-looking narrow-band radiometer-based system (ZEN) for dust aerosol optical depth monitoring |
title_sort |
new zenith-looking narrow-band radiometer-based system (zen) for dust aerosol optical depth monitoring |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/amt-10-565-2017 https://doaj.org/article/b43108150b594437b3afdfe420c7148e |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Atmospheric Measurement Techniques, Vol 10, Iss 2, Pp 565-579 (2017) |
op_relation |
http://www.atmos-meas-tech.net/10/565/2017/amt-10-565-2017.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 1867-1381 1867-8548 doi:10.5194/amt-10-565-2017 https://doaj.org/article/b43108150b594437b3afdfe420c7148e |
op_doi |
https://doi.org/10.5194/amt-10-565-2017 |
container_title |
Atmospheric Measurement Techniques |
container_volume |
10 |
container_issue |
2 |
container_start_page |
565 |
op_container_end_page |
579 |
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1766028059125743616 |