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7 results for “CFC-11”
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 </h3> <h3>Sandip S. Dhomse </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> email: s.s.dhomse@leeds.ac.uk</p> <p> </p> <h3>Methodology: TOMCAT simulation is performed at T64L32 resolution for the 2000-2024 time period. Collocated CFC11 (CFCl3) 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 differences are calculated for each zonal bins (51 height levels, 10km to 60km). Separate XGBoost regression models are trained for the 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. For more details see attached presentation.</h3> <h3>Dataset also includes two files containing daily mean zonal mean CFC11 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 – height level data (10 to 60 km)</h3> <h3>zmcfc11_TCOM_plev_T2Dz_2000-2024_V1.1.nc – 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 “resample” can be used to get monthly means.</h3> <h3> </h3> <h3> </h3>
Dataset for "Atmospheric CFC-11 and CCl4: a Free Calibration Standard for PTR-MS"
<p>Dataset for the publication: Notø and Holzinger (2024), “Atmospheric CFC-11 and CCl4: a Free Calibration Standard for PTR-MS”, <br><a title="Atmospheric CFC-11 and CCl4: a Free Calibration Standard for PTR-MS" href="https://doi.org/10.1016/j.ijms.2024.117311">https://doi.org/10.1016/j.ijms.2024.117311</a></p> <p>The data consists of raw data files of measurements and the processing code to calculate pseudo reaction rate constants of CFC-11 and CCl4 with H3O+.</p>
Near-global CFC-11 retrieved from Atmospheric Infrared Sounder (AIRS) from 2003 to 2018
<p>CFC-11 surface mole fractions were retrieved from monthly clear-sky nadir-view Atmospheric Infrared Sounder (AIRS) observations on 30-deg by 10-deg over 55S-55N. </p> <p>Dataset is available at https://github.com/Huang-Group-UMICH/CFC-11-retrievals-from-AIRS.</p>
Data and code for "On the Effects of the Ocean on Atmospheric CFC-11 Lifetimes And Emissions" (Wang et al. 2021, PNAS)
<p>Data directory includes prescribed emission in MITgcm for CFC-11 and CFC-12, and MITgcm output under different forcing runs. Code directory includes all the code used to generate plots in the paper entitled "On the Effects of the Ocean on Atmospheric CFC-11 Lifetimes And Emissions" (Wang et al. 2021, PNAS). </p>
Constraining Emission Estimates of CFC-11 in Eastern China Based on Local Observations at Surface Stations and Mount Tai
<p>Data in the manuscript</p>
Data from: How atmospheric chemistry and transport drive surface variability of N2O and CFC-11
Open the record for dataset details and reuse information.
HIRDLS/Aura Level 3 Chlorofluorocarbon-11 (CFC-11) 1deg Lat Zonal Fourier Coefficients V007 (H3ZFCCFC11) at GES DISC
The "HIRDLS/Aura Level 3 Chlorofluorocarbon-11 (CFC-11) Zonal Fourier Coefficients" version 7 data product (H3ZFCCFC11) contains the entire mission (~3 years) of HIRDLS data expressed as zonal Fourier coefficients in 1 degree latitude bands from -64 to 80 degrees at 121 pressure levels. The coefficients are computed from the HIRDLS Level 2 profiles with a Kalman filter approach using both forward and backward passes in time. Expressed as the mean and up to 7 sine and cosine coefficients (4 waves for ascending and descending, 7 waves for combined), these coefficients may be used to compute values at any longitude. The data are provided on a pressure grid with 24 levels per decade, corresponding to about 1 km vertical resolution. The useful vertical range of the CFC-11 data is 316 to 17.8 hPa. The precision values are given by the root-mean square of the differences between the estimated fields and the input data.The data are stored in the version 5 Hierarchical Data Format for the Earth Observing System (HDF-EOS5), which is an extension of the HDF5 format. Each file contains a zonal object with data for the entire mission with separate data fields for ascending (daytime), descending (nighttime), and combined orbit node.
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