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TCOM-CFC11 : TOMCAT CTM and Occultation Mesurement based daily zonal mean CFC-11 stratospheric profiles constructed using machine leaning (2000-2023)

<h3>TOMCAT CTM and Occultation measurement-based Stratospheric CFC11 (TCOM-CFC11) profile data data set&nbsp;&nbsp;</h3> <h3>Sandip S. Dhomse&nbsp;</h3> <p>School of Earth and Envio, University of Leeds, Leeds, UK</p> <p>National Centre for Earth Observations, University of Leeds, Leeds, UK</p> <p>&nbsp;email: s.s.dhomse@leeds.ac.uk</p> <p>&nbsp;</p> <h3>Methodology:&nbsp; TOMCAT simulation is performed at T64L32 resolution for the 2000-2024 time period. Collocated CFC11 (CFCl3)&nbsp; profiles are divided in five latitude bins: SH polar (90S-50S), SH mid-lat (70S-20S), tropics (40S-40N), NH mid-lat (20N-70N) and NH polar (50N-90N). Initially, model-measurement&nbsp; differences are calculated for each zonal bins (51 height levels, 10km to 60km). Separate XGBoost regression models are trained for the&nbsp; differences between TOMCAT and measurements at each level for a given latitude bin. XGBoost model is then used to estimate error corrections for all the TOMCAT grids. Estimated corrections for a given model grid that are added to the original TOMCAT simulated daily (at 1.30 local time) CFC-11 profiles. Height resolved data are then interpolated on 28-pressure levels (300 - 0.1hPa). For overlapping latitude bins, we use averages and then calculate daily zonal mean values.&nbsp; For more details see attached presentation.</h3> <h3>Dataset also includes two files containing daily mean zonal mean CFC11&nbsp; profiles on height (10-60 km) and pressure (300-0.1 hPa) levels (8766 days/64 latitudes):</h3> <h3>zmcfc11_TCOM_hlev_T2Dz_2000-2024_V1.1.nc &ndash; height level data (10 to 60 km)</h3> <h3>zmcfc11_TCOM_plev_T2Dz_2000-2024_V1.1.nc &ndash; pressure level data (300 to 0.1 hPa)</h3> <h3>Daily 3D profiles on height and pressure levels would be made available on request. Xarrays &ldquo;resample&rdquo; can be used to get monthly means.</h3> <h3>&nbsp;</h3> <h3>&nbsp;</h3>