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Surface measurements of direct and diffuse voltages at UV wavelengths weremade at the T1 site during the MILAGRO (Megacity Initiative: Local andGlobal Research Observations) field campaign in March 2006, using amultifilter rotating shadowband radiometer (UV-MFRSR). We used the MFRSRdata, together with measurements from a co-located CIMEL Sun photometer atthe site operating as part of the AERONET network, to deduce aerosol singlescattering albedo (ω) at 368 and 332 nm for four cloud-free days during thestudy. Our retrievals suggest that T1 aerosols with aerosol extinctionoptical depth τ368>0.1 that are influenced by Mexico City emissions,blowing dust, and biomass burning, are characterized by low ω368=0.73–0.85and ω332=0.70–0.86, with small or no spectral variation ofω between 368 and 332 nm. Our findings are consistent with other publishedestimates of ω for Mexico City aerosols, including those that suggest thatthe absorption attributable to these aerosols is enhanced at UV wavelengthsrelative to visible wavelengths. We also demonstrate, via sensitivity tests,the importance of accurate τ and surface albedo measurements in ω retrievalsat UV wavelengths

Retrieval of aerosol single scattering albedo at ultraviolet wavelengths at the T1 site during MILAGRO