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Comparison of UV irradiances from Aura/Ozone Monitoring Instrument (OMI) with Brewer measurements at El Arenosillo (Spain) – Part 2: Analysis of site aerosol influence

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Fig. 2. (a) Frequency histogram of alpha values and (b) plot of al- al-pha versus AOD at 440 nm during the analysed OMI period (2004–
Figure 3a shows the relationship between the relative dif- dif-ferences OMI-Brewer and the valid associated values of AOD at 340 nm for cloud-free conditions (white rhomboid points)
Fig. 4. AOD at 440 nm as function of AI index where different subsets of aerosols are indicated
Fig. 5. (a) Mean day values of SSA at 440 nm “(level 1.5)” as function of AOD at 440 nm for the El Arenosillo station for the 2004–2008 period and (b) as function of AI, where different  sub-sets of aerosols specified by alpha and AOD(440 nm) values are re
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