Ryan et al., 2024: Data for One Tree Island Aerosol Measurement Paper

This dataset was used in the preparation of Ryan et al, 2024, a paper summarising aerosol extinction and optical depth made at One Tree Island in the Great Barrier Reef, during February and March 2023. The fieldwork was carried out under the auspices of the Reef Restoration and Adaptation Program's Cooling and Shading Subprogram.

The data in this archive comes from:

• a mini-MPL LiDAR (MPL). The data in 'oti_mpl_nrb_NotCloudFilt_19Feb-31Mar_combinedpolar' is a netCDF file with normalised relative backscatter (NRB) profiles collected using the MPL. The MPL observes aerosol backscatter using a 532 nm laser. Aerosol extinction profiles were calculated from the NRB profiles using the methodology outlined in Ryan et al, 2024, but also following the methodologies outlined in Welton et al, 2001 (https://doi.org/10.1117/12.417040), Welton et al., 2000 (https://doi.org/10.1034/j.1600-0889.2000.00025.x) and Campbell et al., 2002 (https://doi.org/10.1175/1520-0426(2002)019<0431:FTESCA>2.0.CO;2).
• a Multi-axis Differential Optical Absorption Spectrometer (MAX-DOAS). The data in 'OTI_QD_AllBinSpec' are the differential slant column densities (dSCDs) obtained using the 'QDOAS' fitting algorithm (https://uv-vis.aeronomie.be/software/QDOAS/) and the settings outlined in Ryan et al, 2024. The profile retrieval algorithm 'RAPSODI' (see details in Tirpitz et al., 2022, https://doi.org/10.5194/amt-15-2077-2022) was used to convert the dSCDs to vertical aerosol extinction profiles. The dSCDs in this file are for a range of trace gases absorbing in the wavelength range 338-370nm. The relevant species for aerosol retrieval is O4, following the methodology in Wagner et al., 2004 (https://doi.org/10.1029/2004JD004904).
• a weather station; the file 'oti_weatherstation_data' includes text files with key meteorological variables such as temperature, relative humidity, wind speed and direction, all measured at 10 m altitude above One Tree Island.