Retrieval of the aerosol optical thickness from UV global irradiance measurements

3rd Iberian Meeting on Aerosol Science and Technology

Costa, M.J.^1 ; Salgueiro, V.^2 ; Bortoli, D.^2 ; Obregón, M.A.^2 ; Antón, M.^2,3 ; Silva, A.M.^2

Institute de Ciências da Terra - Polo de Évora, Departamento de Física, Universidade de Évora, Évora, Portugal^1

Instituto de Ciências da Terra - Polo de Évora, Departamento de Física, Universidade de Évora, Évora, Portugal^2

Departamento de Física, Universidad de Extremadura, Badajoz, Spain^3

关键词: Aerosol information;    Aerosol optical thickness;    Global irradiance;    Mean absolute error;    Measurements of;    Radiative transfer calculations;    Root mean square errors;    Sun photometers;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/28/1/012007/pdf
DOI  :  10.1088/1755-1315/28/1/012007

来源: IOP

【 摘 要 】

The UV irradiance is measured at Évora since several years, where a CIMEL sunphotometer integrated in AERONET is also installed. In the present work, measurements of UVA (315 - 400 nm) irradiances taken with Kipp&Zonen radiometers, as well as satellite data of ozone total column values, are used in combination with radiative transfer calculations, to estimate the aerosol optical thickness (AOT) in the UV. The retrieved UV AOT in Évora is compared with AERONET AOT (at 340 and 380 nm) and a fairly good agreement is found with a root mean square error of 0.05 (normalized root mean square error of 8.3%) and a mean absolute error of 0.04 (mean percentage error of 2.9%). The methodology is then used to estimate the UV AOT in Sines, an industrialized site on the Atlantic western coast, where the UV irradiance is monitored since 2013 but no aerosol information is available.