a new zenith-looking narrow-band radiometer-based system (zen) for dust aerosol optical depth monitoring
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ID: 194194
2017
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Abstract
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 AOD500 nm
∼ 0.5 and up to 0.15 for AOD500 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 (R2) 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 R2 higher
than 0.97.
| Reference Key |
almansa2017atmospherica
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|---|---|
| Authors | ;A. F. Almansa;E. Cuevas;B. Torres;Á. Barreto;R. D. García;V. E. Cachorro;Á. M. de Frutos;C. López;R. Ramos |
| Journal | bioorganic & medicinal chemistry |
| Year | 2017 |
| DOI |
10.5194/amt-10-565-2017
|
| URL | |
| Keywords |
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