3D cloud metrics for OCO-2 observations

The dataset contain contains supplementary data and the 3D cloud metrics described and analyzed in "Analysis of 3D Cloud Effects in OCO-2 XCO2 Retrievals”, Massie, S. T., Cronk, H., Merrelli, A., Schmidt, K. S., Chen, H., and Baker, D., Atmospheric Measurement Techniques, 14, 1475–1499, 2021.

https://doi.org/10.5194/amt-14-1475-2021

The supplementary data files include the average OCO-2 - TCCON XCO2 differences from several key figures in the manuscript (6, 7, 12). The OCO-2 data was extracted from Version 10 XCO2 retrievals from a subset of the data record used for testing and development by the OCO-2 algorithm team.

figure6_ocean_distkm.dat
figure6_land_distkm.dat
These text files contain the average OCO-2 - TCCON XCO2 differences for several variations of the OCO2 XCO2 (raw and bias corrected, quality filter 0 or 1) as a function of the cloud distance metric. The first file includes only OCO-2 ocean glint data, and corresponds to Figure 6 from the manuscript. The second file contains the equivalent data for OCO-2 land (not plotted in the manuscript).

figure7_ocean_csnoiseratio.dat
figure7_land_csnoiseratio.dat
These text files contains the average OCO-2 - TCCON XCO2 differences for several variations of the OCO-2 XCO2 (raw and bias corrected, quality filter 0 or 1) as a function of the color slice noise ratio. The first file includes only OCO-2 ocean glint data, and corresponds to Figure 7 from the manuscript. The second file contains the equivalent data for OCO-2 land (not plotted in the manuscript).

figure12_ocean.dat
figure12_land.dat
These text files contain the average OCO-2 - TCCON XCO2 differences for several variations of the OCO-2 XCO2, same as above, but as a function of both the cloud distance metric and the color slice noise ratio. The x-variable is the cloud distance metric, and the y-variable is the colorslice noise ratio.
The first file includes only OCO-2 glint data, and corresponds to Figure 12 from the manuscript. The second file contains the equivalent data for OCO-2 land (not plotted in the manuscript).

3D cloud metric data:
3d_cloud_metrics_oco2_v9_2014.zip
3d_cloud_metrics_oco2_v9_2015.zip
3d_cloud_metrics_oco2_v9_2016.zip
3d_cloud_metrics_oco2_v9_2017.zip
3d_cloud_metrics_oco2_v9_2018.zip
3d_cloud_metrics_oco2_v9_2019.zip

These files are created with observation arrays that match those contained within the version 9 OCO-2 Lite XCO2 product available at NASA Earthdata:

OCO-2 Science Team/Michael Gunson, Annmarie Eldering (2018), OCO-2 Level 2 bias-corrected XCO2 and other select fields from the full-physics retrieval aggregated as daily files, Retrospective processing V9r, Greenbelt, MD, USA, Goddard Earth Sciences Data and Information Services Center (GES DISC), 10.5067/W8QGIYNKS3JC

Each file is a daily aggregrate, with matched observation lists to the parent version 9 Lite XCO2 files. Each file contains a copy of the sounding_id from the original Lite product files. These files are grouped into yearly zip files to facilitate easier file transfer. Each daily file is in netCDF4 format with appropriate metadata to describe the fields and their units. The filenames are derived from the parent version 9 Lite XCO2 file with "3Dmetrics" added as a suffix. For example, the first file from 2014 is named "oco2_LtCO2_140906_B9003r_180927215925s_3Dmetrics.nc4" which is derived from the Version 9 Lite product file "oco2_LtCO2_140906_B9003r_180927215925s.nc4".