TROPOMI NO2 data version overview
Note: the vertical dashed line marks a change in the along-track ground pixel size; this change did not lead to a change in the version number.
The TROPOMI NO2 data processor occasionally undergoes version updates, shown above as vN.M.x (where the last digit is for minor bug fixes only). The collection number (left most numbers) is currently linked to the version of the level-1b (ir)radiance spectra.
The initial operational processing started in May 2018 and constitutes versions v1.M.x, followed by v2.2.0 after updates of the level-1b data.
To harmonise the NO2 data, there was an intermediate reprocessing on the PAL system with version v2.3.1, up to the operational processing of that version -- this PAL dataset replaces all previous versions.
After further updates of the level-1b data and the NO2 processor, the current version is v2.4.0 -- this version is used for a full mission reprocessing up to the operational switch to v2.4.0, which replaces all previous versions.
Version v2.5.0 implements a small bug fix in the OFFL code. The change only affects the
qa_valuefield in the datafiles over snow or ice covered regions; the update makes OFFL consistent with NRTI & RPRO v2.4.0 and the ATBD. A recipe to update OFFL v2.4.0 to v2.5.0 is given below.
collection version type start date
dataset DOI Obsolete versions: 01 v1.M.x OFFL
30 April 2018
01 July 2021
10.5270/S5P-s4ljg54 02 v2.2.0 OFFL 01 July 2021
14 Nov. 2021
10.5270/S5P-9bnp8q8 v2.3.1 OFFL 14 Nov. 2021
17 July 2022
10.5270/S5P-9bnp8q8 PAL v2.3.1 PAL_ 01 May 2018
14 Nov. 2021
N/A Versions to be used: 03 v2.4.0 RPRO 01 May 2018
25 July 2022
10.5270/S5P-9bnp8q8 OFFL 17 July 2022
12 March 2023
10.5270/S5P-9bnp8q8 The recommendation is to use the RPRO data up to the end
and only then switch to the OFFL data, so as to avoid spin-up
issues at the beginning of the OFFL data stream.
v2.5.0 OFFL 12 March 2023
Examples of names of NO2 orbits:S5P_RPRO_L2__NO2____20180901T013259_20180901T031627_04578_01_010202_20190220T132149.nc S5P_PAL__L2__NO2____20180901T013358_20180901T031528_04578_01_020301_20211108T224129.nc S5P_OFFL_L2__NO2____20210901T004236_20210901T022405_20127_02_020200_20210902T174110.nc S5P_RPRO_L2__NO2____20220725T170921_20220725T185050_24776_03_020400_20230203T050713.nc S5P_OFFL_L2__NO2____20220821T220529_20220821T234658_25162_03_020400_20220825T083000.nc type start_date end_date orbit CN vers. production_datewhere:
typeis the processing type:
OFFLfor official offline processing
RPROfor official reprocessing
PAL_for the PAL reprocessing
NRTIfor the near-real time processing -- not included here
end_datespecify the begin and end data & time of the orbit
orbitis the orbit number (5 digits)
CNis the collection number (2 digits)
vers.is the NO2 data version (6 digits)
production_dateis when the orbit file was made
Recipe to update OFFL v2.4.0 to v2.5.0Full quote from the Product ReadMe File regarding this update reads:The version 02.05.00 NO2 product implements a small bug fix in the OFFL code. The change only affects the qa_value field in the datafiles, and only over snow or ice covered regions. In the corrected OFFL version there are more pixels that receive a qa_value > 0.75, in case the scene pressure over snow/ice matches the surface pressure to within 4% (was 2% in previous versions). The OFFL 02.04.00 code, operational since 17 July 2022, did not receive this latest change. The update makes OFFL consistent with NRTI, RPRO v02.04.00 and the ATBD.The data user can adjust the qa_value of OFFL v2.4.0 by following this recipe:if ( 0.50 < qa_value_v240 < 0.75 ) then if ( 80 < snow_ice_flag < 104 ) then if ( 0.96 <= apparent_scene_pressure / surface_pressure <= 0.98 ) then qa_value_v250 = qa_value_v240 * 0.88 / 0.73where 0.88 (0.73) is the qa_value multiplication factor for cases where the ratio between the scene and surface pressure is >0.96 (<0.96) in the bug-fixed data version -- in the OFFL v2.4.0 the limit was incorrectly set at 0.98.
TROPOMI NO2 data version documentation
- See the NO2 data products page for the latest available version of:
- van Geffen, J.H.G.M., Eskes, H.J., Boersma, K.F., Maasakkers, J.D. and Veefkind, J.P., TROPOMI ATBD of the total and tropospheric NO2 data products, Report S5P-KNMI-L2-0005-RP, KNMI, De Bilt, The Netherlands.
- Eskes, H. J. and Eichmann K.-U., S5P MPC Product Readme Nitrogen Dioxide, Report S5P-MPC-KNMI-PRF-NO2, ESA.
- Van Geffen, J.H.G.M., Eskes, H.J., Compernolle, S., Pinardi, G., Verhoelst, T., Lambert, J.-C., Sneep, M., ter Linden, M., Ludewig, A., Boersma, K.F. and Veefkind, J.P.,
Sentinel-5P TROPOMI NO2 retrieval: impact of version v2.2 improvements and comparisons with OMI and ground-based data, Atmos. Meas. Tech. 15, 2037-2060, doi:10.5194/amt-15-2037-2022, 2022.
Download of TROPOMI NO2 data
- The official download point is ESA's Sentinal-5P Data Hub
- The PAL reprocessed data set can be found at ESA's S5P-PAL Data Portal
- The officially released data can also be found at NASA's GES DISC Data Collections portal; the PAL data is not included there
- The v2.4.0 (and following) OFFL and RPRO data can be found at TEMIS's Tropospheric NO2 columns from satellite page in a volume-reduced version as daily .tar files; the qa_value of v2.4.0 OFFL files have been updated as described with the above recipe.
last modified: 17 November 2023
Copyright © KNMI / TEMIS