MAX-DOAS retrievals of formaldehyde (HCHO) and nitrogen dioxide (NO2) vertical profiles over Central London

<p>Compressed zipped files of MAX-DOAS measurements at the Central London University College London monitoring site from 1 July to 30 September 2022. </p> <p>Includes three compressed files of daily MAX-DOAS observations of HCHO, NO2, and O4 in NetCDF format. Each compressed file is the collection of measurements for the three optimized azimuth angles. </p> <p>Data variables in each NetCDF file are:</p> <ul> <li>NO2 vertical profiles and error estimate in ppbv</li> <li>HCHO vertical profiles and error estimate in ppbv</li> <li>Aerosol extinction and error estimate at 360 nm in (1/km)</li> <li>Qualitative cloud flag</li> </ul> <p>Variables dimensions and units are specified in each file. </p> <p>Additional details of retrieval of trace gas profiles and cloud detection are in Ryan et al. (2022), submitted for review to Copernicus' Atmospheric Chemistry and Physics journal Measurement Report stream.</p> <p><br></p> <p>NetCDF file of hourly isoprene concentrations at the London Marylebone Road monitoring site from 1 July to 30 September 2022. The file includes isoprene concentrations in ug/m3 and ppbv directly measured and derived using the strong linear relationship bewteen hourly isoprene at Marylebone Road and the London Eltham site. </p> <p><br></p> <p>UCL MAX-DOAS photo credit: Robert G Ryan.</p> <p><br></p>