S5P Mission Performance Centre
Carbon Monoxide [L2__CO____] Readme

document number
Issue
Date
product version
Status

S5P-MPC-SRON-PRF-CO

Prepared by

Jochen Landgraf, Tobias Borsdorff (SRON)
Bavo Langerock, Arno Keppens (BIRA-IASB)MPC Product leads
MPC Validation Coordinators

Reviewed by

J.-C. Lambert (BIRA-IASB)
D. Loyola (DLR)
D. Stein Zweers (KNMI)

MPC ESL-VAL Lead
MPC ESL-L2 Lead
MPC Technical Manager

Approved by

A. Dehn (ESA)
C. Zehner (ESA)ESA Data Quality Manager
ESA Mission Manager

2.5
2023-03-15
V02.05.00
Released

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MPC Contributors

Maarten Sneep (KNMI)
L. Saavedra de Miguel (Serco/ESA)

Mahesh Kumar Sha (BIRA-IASB)S5PVT Contributors 1 Michael Buchwitz (IUPB)
Helen Worden (UCAR)
Antje Inness (ECMWF)

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MPC ESL-L2 Processor Contributor
ESA S5p Mission Support
S5PVT, TCCON4S5P, AO 28603
S5PVT, MECOVAL-S5P, AO 28579
S5PVT, NCAR Project, AO 41074
CAMS project supporting S5PVT

signedAngelik Digitallyby Angelika Dehn
Date: 2023.03.16
a Dehn 15:09:44 +01'00'
Signatures

Angelika Dehn (ESA), Data Quality Manager

signedClaus Digitallyby Claus Zehner
Date: 2023.03.16
Zehner 16:19:52 +01'00'
Claus Zehner (ESA), Sentinel-5 Precursor Mission
Manager

1

The S5PVT AO project summaries can be found athttps://earth.esa.int/eogateway/news/announcement-of-opportunity-for-s5pvt

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Reason for change

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Issue

Revision

Date

2

0

05/07/2021

2

1

17/11/2021

2

2

20/07/2022

2

3

25/11/2022

2

4

23/02/2023

2

5

15/03/2023••

Table 2: Adapting to version 02.02.00 of the processor.
Section 3.2: Validation results shortened, pointing to the routine
Validation reports.
• Section 4.1 & section 0: some text moved from section 4.1(Known Data Quality Issues) to section 0 (Solved Data Quality
Issues).
• Section 6.1: added format changes related to version 02.02.00.
Table 2: Adapting to version 02.03.01 of the processor• Table 2: adapting to version 02.04.00 of the processor• Section 6.1: added format changes related to version 02.04.00
Table 2: addition of reprocessed data with version 02.04.00• Table 2: extend dates of reprocessed dataset availability withversion 02.04.00 (from 31 March to 25 July 2022)• Section 7: updates with information related to gaps on the
reprocessed dataset• Table 2: adapting to version 02.05.00 of the processor• Section 6.1: added minor format changes related to version
02.05.00

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SummaryThis is the Product Readme File (PRF) for the Copernicus Sentinel 5 Precursor Tropospheric Monitoring
Instrument (S5P/TROPOMI) Carbon Monoxide total column level 2 data product and is applicable for
the Offline (OFFL), Near Real Time (NRTI) and Reprocessed (RPRO) timeliness data product.
Product Identifier: L2__CO____
Example filename for the OFFL and NRTI product:
S5P_OFFL_L2__CO_____20210908T001010_20210908T015140_20226_02_020200_20210909T135900.nc
S5P_NRTI_L2__CO_____20210908T002709_20210908T003209_20226_02_020200_20210908T012952.nc
S5P_RPRO_L2__CO_____20180430T001950_20180430T020120_02818_03_020400_20220901T170054.nc

The file name convention is described in more detail in the Product User Manual (PUM) [RD03]. The
OFFL and RPRO product for version 2.x have the following Digital Object Identifier (DOI):
http://doi.org/10.5270/S5P-bj3nry0, for the NRTI product a corresponding identifier is not applicable.
This Readme file describes the current processing baseline, product and quality limitations, and productavailability status. More information on this data product is available from the Copernicus Sentinel
product webpage:https://sentinels.copernicus.eu/web/sentinel/technical-guides/sentinel-5p/products-algorithms,
and from the TROPOMI product webpage http://www.tropomi.eu/data-products.
The data file contains the carbonmonoxide_total_column, which gives the total atmosphericcolumn between the surface and the top of atmosphere. The respective random error originating fromthe spectral fit is given in the carbonmonoxide_total_column_precision. As a user guideline forthe data quality a qa_value is given with the data. To avoid misinterpretation of the data quality, it isrecommended at the current stage to only use those pixels with a qa_value above 0.5.
The NRTI data stream delivers the CO column data product within 3 hours after sensing, whereas the
OFFL data product is available a few days after acquisition. Because of the different timeliness, the
NRTI product is given in 5 min data granules whereas the OFFL data product per satellite orbit. Boththe OFFL and NRTI processing chains employ the same algorithm. Since processor version 01.03.02,
the same configuration settings are used for both data streams and so the data products are expected
to be of the same quality. For earlier versions, the NRTI and OFFL data product differ in the way thesolar irradiance measurements are used. The NRTI processing requires the L1B reflectance spectra as
input to the retrieval, whereas the OFFL processing is based on the Earthshine radiance measurements
and uses a spectral deconvolution of the solar irradiance spectra during the algorithm initialization toinfer a line-by-line solar spectrum as an input to the retrieval. More details on the two processing streams
are given in the product Algorithm Theoretical Basis Document (ATBD) [RD02].
Note: Starting from processor version 2.4.0, new improved Level 1b version 2.1 data products are used
as input [RD06].
Independent validation by MPC Cal/Val experts and the Sentinel-5 Precursor Validation Team (S5PVT)
concludes that OFFL CO total column data is compliant with the requirements as defined in the S5P
Calibration and Validation Plan [RD01], see Table 1.
Up to date validation results are available in the Routine Operations Consolidated Validation Reports(ROCVR) that are accessible through the MPC Validation Data Analysis Facility (VDAF) website at
http://mpc-vdaf.tropomi.eu. The ROCVR reports are issued quarterly, and reports released after
September 2021 include validation results based on processor version 2.x.x.
Parameter

Data productVerticalResolution

Bias

RandomTotal column

Carbon monoxide (CO)Total column

15%

10%

Table 1: Mission data requirements for the CO product, extracted from [RD01]

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Processing baseline description

Table 2 contains the history of the CO processor versions. Note that the processor version for CO is changing when there is a change to any of the products
belonging to the NL-L2 processor suite (NO2, CO, CH4, AI, ALH, O3 PR) even if the change is not affecting the CO product.

Processor
VersionIn operation from

In operation until

Relevant improvements

02.05.00

OFFL: orbit 28031, 2023-03-12
NRTI: orbit 28078, 2023-03-15

Current version

Minor format changes (see section 6.1)

02.04.00

RPRO: orbit 2818, 2018-04-30
OFFL: orbit 24655, 2022-07-17
NRTI: orbit 24697, 2022-07-20

Orbit 24779, 2022-07-25
Orbit 28030, 2023-03-12
Orbit 28074, 2023-03-15•

Total column averaging kernels in unitless representation•

Null-space filling used for the retrieval parameters•

The TM5 a priori profiles are included in the output

Note 1: It is recommended to use the RPRO products in the orbit range
24655 - 24779, period for which also OFFL products are available. This, inorder to avoid products with possible instabilities, because generated
during the first days of the operational switch to version 2.4.0
Note 2: Starting from this processor version, new improved Level 1bversion 2.1 data products are used as input [RD06]

02.03.01

02.02.00

OFFL: orbit 21188, 2021-11-14
NRTI: orbit 21223, 2021-11-17

OFFL: orbit 19258, 2021-07-01
NRTI: orbit 19308, 2021-07-05

Orbit 24654, 2022-07-17
Orbit 24697, 2022-07-20

Orbit 21187, 2021-11-14
Orbit 21222, 2021-11-17

No changes with respect to previous version•

Update CH4, CO and H2O cross sections in the CO and CH4
processors: the updated cross sections are based on DLR Scientific
Exploitation of Operational Missions – Improved AtmosphericSpectroscopy Databases (SEOM-IAS) spectroscopy(https://zenodo.org/record/1009126#.YJurduvRaL4)•

Added CO destriping algorithm for OFFL data

Note: Starting from this processor version, new improved Level 1b version
2.0 data products are used as input [RD06]
01.04.00

OFFL: orbit 16213, 2020-11-29
NRTI: orbit 16259, 2020-12-02

Orbit 19257, 2021-07-01
Orbit 19306, 2021-07-05

No changes with respect to previous version

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01.03.02
01.03.01
01.03.00
01.02.02
01.02.00
01.01.00
01.00.02

OFFL: orbit 8815, 201906-26
NRTI: orbit 8906, 2019-07-03
OFFL: orbit 7907, 2019-04-23
NRTI: orbit 8000, 2019-04-30
OFFL: orbit 7425, 2019-03-20
NRTI: orbit 7519, 2019-03-27
RPRO: orbit 2818, 2018-04-30
OFFL: orbit 5833, 2018-11-28
NRTI: orbit 5932, 2018-12-05
OFFL: orbit 5236, 2018-10-17
NRTI: orbit 5741, 2018-11-22
OFFL: orbit 3848, 2018-07-11
OFFL: orbit 3661, 2018-06-28

Orbit 16212, 2020-11-29
Orbit 16256, 2020-12-02
Orbit 8814, 2019-06-26
Orbit 8906, 2019-07-03
Orbit 7906, 2019-04-23
Orbit 7999, 2019-04-30
Orbit 3847, 2018-07-11
Orbit 7424, 2019-03-20
Orbit 7518, 2019-03-27
Orbit 5832, 2018-11-28
Orbit 5929, 2018-12-05
Orbit 5235, 2018-10-17
Orbit 3847, 2018-07-11

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OFFL and NRTI processing chains employ the same algorithm since thisversionNo changes with respect to previous version
Added new variables: eastward_wind and northward_wind
Sun glint was wrongly considered in the qa_value calculation in previous
versions
Adjusted qa_value in case of eclipse
Correction of a bug for qa_value and updated definition
Initial operational version

Table 2: History of CO processor versions. In orange, the data versions that are no longer available to the users on the Pre-operations hub.

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Product Quality

3.1

Recommendations for data usage

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Both for the OFFL and NRTI product, it is recommended to use TROPOMI CO data associated with aquality assurance value qa_value > 0.5. The qa_value is provided as part of the CO data productand the definition used in the current data release is summarized in Table 3.
Qa_value

Condition

Remark1.0

τaer < 0.5 and zcld < 500 m

clear-sky and clear-sky like observations

0.7

τaer ≥ 0.5 and zcld < 5000 m

mid-levels cloud

0.4(τaer ≥ 0.5 and zcld ≥ 5000 m) or

high clouds, experimental data set(τaer ≤ 0.5 and zcld ≥ 500 m)
0.0

irow 1 or SZA80o or defective productcorrupted or defective data

Table 3: qa_value parameter definition
Here, irow 1 filters out the two most westward pixels because of unresolved calibration issues. For low
sun with Solar Zenith Angles SZA80o the retrieval is most sensitive to radiometric and retrieval errors
due to the long light path through the atmosphere. We recommend using only data with a qa_value =1 in case the averaging kernel is not applied. Data with a qa_value = 0.7 are of similar quality provided
the averaging kernel is used to account for the vertical retrieval sensitivity in the presence of mid-levelclouds. Quality assurance values of qa_value = 0.4 represent experimental data to be used withcaution.
For further details, data users are encouraged to read the Product User Manual (PUM, [RD03]) and
Algorithm Theoretical Basis Document (ATBD, [RD02]) associated with this data product, both available
on https://sentinels.copernicus.eu/web/sentinel/technical-guides/sentinel-5p/products-algorithms.
The TROPOMI CO product provides total column averaging kernels for the individual retrievals fromeach ground pixel of the satellite provided in the variable column_averaging_kernel. The total
column-averaging kernel is unit less since version 02.04.00, and defined on vertical partial column
profiles which is a more common representation. In previous processor versions (<02.04.00) the variablecolumn_averaging_kernel had the unit meters and needed to be divided by 1000 m to transfer it
to its unit less representation. This is not needed anymore.
The TROPOMI CO retrieval is based on the profile scaling inversion and Borsdorff et al. (2014) [RD05]
showed that in this case the equation xref=a*xref holds which means that the total column averaging
kernel a cannot smooth the vertical CO reference profile x ref that is used for scaling within the inversion.
This simplifies the validation equation xret = a* xtrue + (a-1)* xref to xret = a* xtrue . Hence, this means vertical
CO profiles from e.g. model calculations or airborne measurement can be smoothed by the total column
averaging kernel a and compared to the CO total columns of TROPOMI without the need of thereference profile xref that is used within the TROPOMI CO retrieval. The total column-averaging kernelof TROPOMI is defined for vertical altitude layers, hence the values and shape of the kernel depends
on this vertical grid. We highly recommend for validation purposes not interpolating the averaging kernel
on different vertical grids but integrate the vertical CO profiles used for validation or inter-comparison on
the partial column layering used for the TROPOMI CO total column averaging kernel that consists ofequidistant 1000m thick layers and starts from the surface altitude provided for each ground pixel of
TROPOMI.

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Validation results

Independent validation by MPC Cal/Val experts and the Sentinel-5 Precursor Validation Team (S5PVT)
concludes that the version 1.x.x of the OFFL CO total column data is in good overall agreement with (i)reference measurements collected from the TCCON and NDACC global ground-based networks, and(ii) the corresponding satellite data products from MOPITT. In particular, a bias of <10% found in thedata comparisons is well within the mission requirements (Table 1) of ≤ 15%. The scatter of the dataaround this bias also complies with mission requirements of ≤10%. The comparison of S5p TROPOMI
and MOPITT CO total columns supports the findings of the data product validation with ground-based
measurements. The NRTI product was subject to an additional positive bias of 3-4 % but since processor
version 01.03.02, the same configuration settings are used for the NRTI and OFFL data processing
streams and therefore the data products are of the same quality.
The quality of the processor version 2.x.x is routinely assessed since the production started in July 2021,
and the results is that, as expected, the data are slightly biased low compared to version 1.
Up to date validation results are available in the Routine Operations Consolidated Validation Reports(ROCVR) that are accessible through the MPC Validation Data Analysis Facility (VDAF) website at
http://mpc-vdaf.tropomi.eu. The ROCVR reports are issued quarterly, and reports released after
September 2021 include validation results based on processor version 2.x.x.
We thank all the TCCON and NDACC PI’s for providing the data without which this validation study
would not have been possible.

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Data Quality Remarks

4.1

Known Data Quality Issues

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Currently, the following data quality issues are known, not covered by the quality flags, and should be
kept in mind when looking at the carbon monoxide product and also at preliminary validation results.
StripesSingle TROPOMI overpasses show stripes of erroneous CO values < 10% in the flight direction,
probably due to calibration issues of TROPOMI. Borsdorff et al. 2019 [RD04] suggested two methods
to correct the high-frequency variations of the CO measurements across flight direction per orbit. The
fixed masked destriping method (FFM) is based on median filtering of the detected features in flight
direction and the Fourier Filter Destriping (FFD) that corrects stripes in the frequency domain. The FFM
method has been implemented in the operational TROPOMI CO processor (V2.x.x). Additionally, to theuncorrected output, the user can now access the corrected TROPOMI CO columns and the destriping
mask
via
the
variablecarbonmonoxide_total_column_correctedandcarbonmonoxide_total_column_stripe. The FFD methods shows an even better destriping
performance compared to the FFM method and is considered for future updates of the operational
processing.

4.2

Solved Data Quality Issues

QA value (solved in version 01.02.02)
Sun glint is wrongly considered in the calculation of the qa_value. This is corrected since the activationof version 01.02.02 (December 2018, see Table 2).
Orbit numbering in NRTI and OFFL (solved in version 01.02.02)
Note that NRTI orbit numbers are set with respect to the downlink orbit while OFFL orbit numbers are
set with respect to the equator crossing time. This creates an inconsistency between the NRTI and
OFFL orbit numbers, which is removed with the activation of processor version 01.02.02 (December
2018, see Table 2).
Metadata/Attributes (solved in version 02.02.00)
The spatial resolution of the TROPOMI measurements is improved by bringing the along track groundpixel size from 7.0 to 5.5 Km starting on 6th August 2019. Note that, after this operations change, themetadata/Attributes fields related to the spatial resolution remained unchanged (hence not aligned tothe improved resolution). These fields have been updated with the activation of Level 2 processors
version 02.02.00.
Metadata values exchanged (solved)
The global attributes geospatial_lon_min and geospatial_lon_max values are exchanged;
therefore, the user is advised to switch the values for these fields, making note that thegeospatial_lat_min and geospatial_lat_max values are correct. This is an issue traceable toL1b data (version 01.00.00) and is corrected since the switch to version 02.00.00 of the Level 1B
processor switched on July 2021.
Geolocation co-added when they should not be (solved in version 02.03.01)
In version 02.02.00, the geolocation of pixels near the pole show a shift of up to 300 meters due to a coaddition activity performed by mistake. This has been corrected in version 02.03.01.

4.3

Data Features

This section describes some characteristics of the data that might seem anomalous, however they arephysically correct and not related to any problem.

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Pixel geolocation around North Pole (feature)
The solar irradiance is measured on a daily basis over the North Pole at a reference azimuth angle toremove seasonal effects on the measurements. To this end, a yaw manoeuvre is executed when the
instrument is still in radiance mode, causing possible distortion on the scanlines observed during thismanoeuvre (i.e. crossing scanlines, "bow-tie" ground pixel shape instead of rectangular). This occurs at
most during the last 26 seconds of radiance measurements every 15th orbit (once every 25 hours).
Though this may seem anomalous, it is physically correct, and not related to any problem on the data
geolocation.

4.4

Mission Operations Changes

A change in the Copernicus Sentinel 5P operations scenario increasing the spatial resolution from 7.0
km to 5.5 km along track for all measurements, became operational starting from 6 August 2019, orbit
9388.

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Algorithm Change Record

For a detailed description of the L2__CO____ algorithms, please refer to the ATBD [RD02].

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Data Format

The product is stored as NetCDF4 file. The NetCDF4 file contains both the data and the metadata forthe product.
For OFFL data the product is stored as a single file per satellite orbit, for NRTI data the product is stored
as multiple files per orbit.
Please note that consecutive data granules of the NRTI product show an overlap of about 12 scan lines.
Details of the data format are provided in the Product User Manual (PUM) [RD03].

6.1

Data format changes

6.1.1

Version 02.05.00

Attribute fields with text changes
In variable /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/wavelength_calibration_offset
attribute ‘long_name’ → text changed (from ‘Spectral offset’’ to ‘Spectral offset in the SWIR band,
add value to L1B to obtain best fit result’)
6.1.2

Version 02.04.00

New fields added/PRODUCT/SUPPORT_DATA/INPUT_DATA/carbonmonoxide_profile_apriori contains the TM5
profile a priori used for the profile scaling retrieval.
/METADATA/QA_STATISTICS/number_of_thermal_instability_warning_occurrences
In variable:/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/processing_quality_flags
Added element to attribute ‘flag_meanings’: [success, radiance_missing,irradiance_missing, input_spectrum_missing, …, thermal_instability_warning]
Added element to attribute ‘flag_masks’: [255, 255, 255, …, 1073741824]
Added element to attribute ‘flag_values’: [0, 1, 2, 3, 4, …, 1073741824]
Unit change of a field/PRODUCT/DETAILED_RESULTS/column_averaging_kernel attribute ‘unit’ changed from theunit (m) to its unit less representation (1).
6.1.3

Version 02.03.01

There are no format changes with respect to the previous version.
6.1.4

Version 02.02.00

New fields added/METADATA/QA_STATISTICS attribute number_of_missing_scanlines/METADATA/QA_STATISTICS attribute number_of_max_num_outlier_exceeded_error_occurrences/METADATA/GRANULE_DESCRIPTION attribute CollectionIdentifier/PRODUCT/carbonmonoxide_total_column_corrected
This variable contains the carbon monoxide total column with a destriping correction applied. The
destriping algorithm requires a full orbit, and is therefore not possible in NRTI processing. In a NRTI
granule this variable only contains fill values.
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/carbonmonoxide_total_column_stripe_offset
This variable is the stripe correction (offset) that is calculated in OFFLINE processing.

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Removed fields/METADATA/ISO_METADATA/gmd:identificationInfo/gmd:spatialResolution
Renamed fields/PRODUCT/qa_value attribute valid_min_→ /PRODUCT/qa_value attribute valid_min/PRODUCT/qa_value attribute valid_max_→ /PRODUCT/qa_value attribute valid_max/METADATA/QA_STATISTICS attribute number_of_aai_warning_occurrences→ /METADATA/QA_STATISTICS attribute number_of_AAI_warning_occurrences
6.1.5

Version 01.04.00

There are no format changes with respect to the previous version.
6.1.6

Version 01.03.00

New fields added/PRODUCT/SUPPORT_DATA/INPUT_DATA/eastward_wind/PRODUCT/SUPPORT_DATA/INPUT_DATA/northward_wind

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Product Availability

All S5P/TROPOMI data are available on the Copernicus Open Data Hub https://scihub.copernicus.eu.
Also, the full mission reprocessed products can be found on the mentioned Open Data Hub and can be
identified by the file class ‘RPRO’ in the filenames. The collection identifier is ‘03’, the same used for theoperational dataset that is available since mid-July 2022 (all with version 2.4.0).
The list of major mission data gaps due to acquisition faults or satellite/instrument disruption is available
at https://sentinel.esa.int/web/sentinel/missions/sentinel-5p/mission-status. For those periods the data
are permanently lost.
RPRO dataset gaps: additional gaps are present on the reprocessed dataset (see Table 4) due to theunavailability of Level 0 (L0) input data during the full mission reprocessing campaign.

Orbit

Gap start time

Gap stop time3546

20/06/2018 08:31:35

20/06/2018 08:51:37

9755
10782
19782
19785
20254

31/08/2019 23:46:24

01/09/2019 00:06:25

12/11/2019 08:39:57

12/11/2019 09:29:55

07/08/2021 18:09:52

07/08/2021 18:27:54

07/08/2021 22:34:02

07/08/2021 22:50:52

10/09/2021 00:01:42

10/09/2021 00:21:43

Table 4: Gaps on RPRO dataset due to the unavailability of L0 input
data during the full mission reprocessing campaign

Information on data handling tools is available from the web page http://www.tropomi.eu/tools.
For further questions regarding S5P/TROPOMI data products please contact
EOSupport@Copernicus.esa.int.
The access and use of any Copernicus Sentinel data available through the Copernicus Sentinel Data
Hub is governed by the Legal Notice on the use of Copernicus Sentinel Data and Service Informationand is given here:
https://sentinels.copernicus.eu/documents/247904/690755/Sentinel_Data_Legal_Notice.

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References[RD01]

Sentinel-5 Precursor Calibration and Validation Plan for the Operational Phase
source: ESA; ref: ESA-EOPG-CSCOP-PL-0073;
url: https://sentinels.copernicus.eu/documents/247904/2474724/Sentinel-5PCalibration-and-Validation-Plan.pdf[RD02]

Algorithm Theoretical Baseline Document for Sentinel-5 Precursor: Carbon Monoxide
Total Column Retrieval,source: SRON ref: SRON-S5P-LEV2-RP-002,
url: https://sentinels.copernicus.eu/documents/247904/2476257/Sentinel-5PTROPOMI-ATBD-Carbon-Monoxide-Total-Column-Retrieval[RD03]

Sentinel-5 precursor/TROPOMI Level 2 Product User Manual Carbon Monoxide
source: KNMI; ref: SRON-S5P-LEV2-MA-002;
url: https://sentinels.copernicus.eu/documents/247904/2474726/Sentinel-5P-Level-2Product-User-Manual-Carbon-Monoxide[RD04]

Borsdorff, T., aan de Brugh, J., Schneider, A., Lorente, A., Birk, M., Wagner, G., Kivi,
R., Hase, F., Feist, D. G., Sussmann, R., Rettinger, M., Wunch, D., Warneke, T., andLandgraf, J.: Improving the TROPOMI CO data product: update of the spectroscopic
database and destriping of single orbits, Atmos. Meas. Tech., 12, 5443–5455,
https://doi.org/10.5194/amt-12-5443-2019, 2019.

[RD05]

Borsdorff, T., Hasekamp, O. P., Wassmann, A., and Landgraf, J.: Insights into Tikhonov
regularization: application to trace gas column retrieval and the efficient calculation of
total column averaging kernels, Atmos. Meas. Tech., 7, 523–535,
https://doi.org/10.5194/amt-7-523-2014, 2014.

[RD06]

Algorithm theoretical basis document for the TROPOMI L01b data processor
source: KNMI; ref: S5P-KNMI-L01B-0009-SD;
url: https://sentinels.copernicus.eu/documents/247904/2476257/Sentinel-5PTROPOMI-Level-1B-ATBD

More information on this data product is available from the Sentinel product webpage:https://sentinels.copernicus.eu/web/sentinel/technical-guides/sentinel-5p/products-algorithms,
and from the corresponding TROPOMI product webpage http://www.tropomi.eu/data-products.

S5P MPC Product Readme Carbon Monoxide V02.05.00
issue 2.5, 2023-03-15 - Released

S5P-MPC-SRON-PRF-CO
Page 16 of 16

Abbreviations and acronyms
ATBD

Algorithm Theoretical Basis Document

BIRA-IASBRoyal Belgian Institute for Space Aeronomy

CAMS

Copernicus Atmosphere Monitoring Service

CO

Carbon Monoxide

DOI

Digital Object Identifier

ESA

European Space Agency

ESL

Expert Support Laboratory

ESRIN

European Space Research Institute

FFD

Fourier Filter Destriping

FFM

Fixed masked destriping Method

FTIR

Fourier Transform Infra-Red

IFS

ECMWF Integrated Forecasting System

KNMI

Royal Netherlands Meteorological Institute / Koninklijk Nederlands
Meteorologisch Instituut

MOPITT

Measurements of Pollution in the Troposphere

MPC

Mission Performance Centre

NDACC

Network for the Detection of Atmospheric Composition Change

NRTI

Near Real Time

OFFL

OfflinePRF

Product Readme File

PUM

Product User Manual

ROCVR

Routine Operations Consolidated Validation Report

RPRO

Reprocessing

S5P

Sentinel-5 Precursor

S5PVT

Sentinel-5 Precursor Validation TeamSEOMS-IAS

Scientific Exploitation of Operational Missions – Improved AtmosphericSpectroscopy Databases

SZA

Solar Zenith Angle

TCCON

Total Carbon Column Observing Network

TROPOMI

Tropospheric Monitoring Instrument

VDAF

Validation Data Analysis Facility