S5P Mission Performance Centre
UV Aerosol Index [L2__AER_AI] Readme

document number
issue
date
product version
status

S5P-MPC-KNMI-PRF-AER_AI

Prepared by

D. Stein Zweers (KNMI),
T. Wagner (MPIC)

MPC Product Lead
MPC Validation Coordinator

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

M. Sneep (KNMI),
M. de Graaf (KNMI),
L. Saavedra de Miguel (Serco/ESA)MPC ESL-L2 Product Contributor
MPC ESL-L2 Product Contributor
ESA S5p Mission Support

S5PVT1
Contributors

O. Torres (NASA-GSFC)
C. Ahn (NASA-GSFC)

S5PVT, NASA Project, AO 28329
S5PVT, NASA Project, AO 28329

signedAngelik Digitallyby Angelika Dehn
Date: 2023.03.16
a Dehn 15:04:21 +01'00'
Signatures

Angelika Dehn (ESA), Data Quality Manager

signedClaus Digitallyby Claus Zehner
Date: 2023.03.16
Zehner 16:16:51 +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

Issue

Revision

1

6

Date
02/12/2020

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: addition of version 01.04.00• Table 2: Adapting to V02.02.00 of the processor• Section 3.2: Validation results shortened, pointing to the routine
Validation reports• Section 4.1 & section 4.2: some text moved from section 4.1(Known Data Quality Issues) to section 4.2 (Solved Data Quality
Issues)• Section 6.1: added format changes related to version 02.02.00• Table 2: addition of version 02.03.01• Section 4.2: added two solved issues with version 02.03.01• Section 6.1: added format changes with version 02.03.01• Table 2: addition of version 02.04.00• Section 6.1: added format changes with 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: addition of version 2.5.0• Section 6.1: added format changes related to version 2.5.0

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SummaryThis is the Product Readme file (PRF) for the Copernicus Sentinel 5 Precursor Tropospheric Monitoring
Instrument (S5P/TROPOMI) UV Aerosol Index Level 2 product and is applicable for the Near Real-Time(NRTI), Offline (OFFL) and Reprocessed (RPRO) timeliness data products.
Product Identifier: L2__AER_AI
Example filename:
S5P_NRTI_L2__AER_AI_20210908T002709_20210908T003209_20226_02_020200_20210908T012955.nc
S5P_OFFL_L2__AER_AI_20210908T001010_20210908T015140_20226_02_020200_20210909T135904.nc
S5P_RPRO_L2__AER_AI_20180430T001950_20180430T020120_02818_03_020400_20221026T115627.nc

The version 2.x data product (OFFL and RPRO) have the following Digital Object Identifier (DOI):
http://doi.org/10.5270/S5P-3dgz66p
The Readme file describes the current processing baseline, product and quality limitations, and productavailability status. 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 TROPOMI product webpage http://www.tropomi.eu/data-products.
The data file contains the aerosol_index_340_380 and aerosol_index_354_388 which gives
the UVAI calculated for two different wavelength pairs. Since version 2.4.0 of the processor, a newwavelength pair using 335 and 367 nm to perform an aerosol index calculation has been added to theprocessor (aerosol_index_335_367). This is in preparation for the Sentinel 5 mission which will
include the same analysis. As a user guideline for the data quality a qa_value is given. In order toavoid the effects of sun glint it is recommended to only use those pixels with a qa_value above 0.8.
Note: Starting from processor version 2.4.0, new improved Level 1b version 2.1 data products are used
as input [RD04].
Independent validation by MPC Cal/Val experts and the Sentinel-5 Precursor Validation Team (S5PVT)
concludes that the NRTI and OFFL UVAI are in good overall agreement with similar satellite data
products from OMI and OMPS. A bias of just under 1 UVAI index point was found as compared to OMI
and OMPS that is within the ESA mission requirements (see Table 1). However, starting in 2019 due tothe wavelength dependent degradation in the diffuser affecting Band 3, the bias observed with version
1.4.0 was slightly larger than 1 UVAI index point unit as compared to OMI and OMPS (See Section 4).
With version 2.2.0, the L1b was updated and the UVAI offsets were applied so that the UVAI is now
within data product requirements. The standard deviation of the TROPOMI UVAI is similar as for the
OMPS LER product. Thus, it is concluded that the TROPOMI product is within the limit for the randomrequirement of 0.1 UVAI units.
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.
The data product requirements are listed in the S5P Calibration and Validation Plan [RD01].

Parameter

Data productVerticalResolution

Bias

RandomAerosol

Aerosol type

Total column~1 AAI<0.1 AAI

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

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Processing baseline description

Table 2 contains the history of the UVAI processor versions. Version changes reflect updates in the data processor software only. Note that the processor
version for UVAI is changing when there is a change to any of the products belonging to the NL-L2 processor suite (NO2, CO, CH4, UVAI, ALH, O3 PR) even
if the change is not affecting the UVAI product.
Processor
VersionIn operation starting from

In operation until

Relevant Improvements

02.05.00

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

Current version

Minor format changes (see section 6.1)
A new wavelength pair using 335 and 367 nm to perform an aerosol index
calculation has been added to the processor (see section 6.1). This is inpreparation for the Sentinel 5 mission which will include the same analysis.

02.04.00

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

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

02.03.01

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

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

02.02.00

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

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

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, in order to avoid
products with possible instabilities, because generated during the first days of theoperational switch to version 2.4.0
Note 2: Starting from processor version 2.4.0, new improved Level 1b version 2.1
data products are used as input [RD04].
Minor format changes: text changed in attribute description for two fields (seesection 6.1)
AAI offset correction added, for both pairs separately. The biggest change for AAI
comes from the impact of the updated V2.0 L1b (switched into operations at thesame time), as it includes a degradation correction in the irradiance.
Note: Starting from processor version 2.2.0, new improved Level 1b version 2.0
data products are used as input [RD04].

01.04.00

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

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

No changes with respect to previous version

01.03.02

NRTI: orbit 8906, 2019-07-03
OFFL: orbit 8815, 2019-06-26

Orbit 16256, 2020-12-02
Orbit 16212, 2020-11-29

No changes with respect to previous version

01.03.01

NRTI: orbit 8000, 2019-04-30
OFFL: orbit 7907, 2019-04-23

Orbit 8906, 2019-07-03
Orbit 8814, 2019-06-26

No changes with respect to previous version

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01.03.00

NRTI: orbit 7519, 2019-03-27
OFFL: orbit 7425, 2019-03-20

Orbit 7999, 2019-04-30
Orbit 7906, 2019-04-23

Added new variables: eastward_wind and northward_wind (see section 6.1)

01.02.02

NRTI: orbit 5932, 2018-12-05
OFFL: orbit 5833, 2018-11-28

Orbit 7518, 2019-03-27
Orbit 7424, 2019-03-20

No changes with respect to previous version

01.02.00

NRTI: orbit 5336, 2018-10-24
OFFL: orbit 5236, 2018-10-17

Orbit 5929, 2018-12-05
Orbit 5832, 2018-11-28

Adjusted qa_value in case of eclipse

01.01.00

NRTI: orbit 3947, 2018-07-18
OFFL: orbit 3848, 2018-07-11

Orbit 5333, 2018-10-24
Orbit 5235, 2018-10-17

No changes with respect to previous version

01.00.02

NRTI: orbit 3745, 2018-07-04
OFFL: orbit 3661, 2018-06-28

Orbit 3946, 2018-07-18
Orbit 3847, 2018-07-11

Initial operational version

Table 2: History of UVAI processor versions

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Product Quality

3.1

Recommendations for data usage

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In order to avoid misinterpretation of the data quality and to avoid the effects of sun glint, it isrecommended to only use those TROPOMI pixels associated with a qa_value above 0.8.
The variable(s) aerosol_index_340_380_precision can be used to diagnose the quality of the
UVAI (where, this variable is available for all three wavelength pairs in the format
aerosol_index_3xx_3xx_precision).
For further details, data users are encouraged to read the Product User Manual (PUM) and Algorithm
Theoretical Basis Document (ATBD) associated with this data product, available on
https://sentinels.copernicus.eu/web/sentinel/technical-guides/sentinel-5p/products-algorithms.

3.2

Validation results

The S5P UV Aerosol Absorbing Index data is in good overall agreement with similar satellite data
products from EOS-Aura OMI and Suomi-NPP OMPS. Although compliant with the mission requirementof 1 UVAI unit in 2018, the bias observed with version 1.4.0 was larger than 1 UVAI unit as comparedto OMI and OMPS until version 2.2.0 when the L1b processor was updated and the UVAI offsets wereapplied. The UVAI is now within data product requirements.
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.

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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 UV Aerosol Index products and also at preliminary validation results.
Bias as compared to other satellite datasets
The aerosol index is highly sensitive to the calibration of absolute irradiance and radiance and any small
deviations in the Level 1B input data. As a result of observed wavelength-dependent degradation in boththe irradiance and the radiance (degradation stronger at shorter wavelengths), there was an apparent
increase of the reflectance at the shortest wavelength and therefore the aerosol index was exhibiting alarge, increasing negative bias. With the V2.0 L1b update this negative bias has been removed, but apositive offset was introduced. As a result, offsets have been applied to the pairs so that the global meanis closer to other aerosol index measurements from other satellite missions including OMI and OMPS.
The offset factors applied to the aerosol index will continue to be optimized as the L1b data is further
updated to include correction for degradation in the radiance.
Since the degradation is wavelength dependent, the various UVAI pairs react differently, where theshorter wavelength exhibits a larger effect. As such, offset values unique to each pair have been applied.
With the application of the fully updated L1b and the reprocessed dataset, these offset values will be reevaluated and updated as needed
Large negative and positive values for clouds
Large negative and positive values related to clouds can be seen at higher latitudes. These appear to
be related to cloud 3D effects and cloud shadows. Investigation is ongoing.

4.2

Solved Data Quality Issues

NRTI data gaps northern hemisphere (solved in version 01.01.00)
The NRTI data stream shows data gaps over Kazakhstan, southern part of Russia and Canada due toa miss-configuration of the processing facility. This issue is solved with the activation of processor
version 01.01.00 mid-July 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 (see Table 2).
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 on July 2021.
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 on July 2021.
Precision calculation (solved in version 02.03.01)
The calculation of the precision of the aerosol index parameters – a propagation of the random noise in
the input radiance and irradiance – contained an error in the use of parentheses. The result of this was

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a severe overestimation of the error. Note that the offsets mentioned in the known data quality issues
are not covered by this precision estimate, this is only a propagation of the noise error in the L1b.
Geolocation co-added when they should not be (solved in 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.
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__AER_AI algorithm, 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/aerosol_index_354_388 attribute ‘comment’ → text changed (from ‘Aerosol
index from 388 and 354 nm’ to ‘Aerosol index from 354 and 388 nm’)
In variable /PRODUCT/aerosol_index_354_388 attribute ‘long_name’ → text changed (from‘Aerosol index from 388 and 354 nm’ to ‘Aerosol index from 354 and 388 nm’)
In variable /PRODUCT/aerosol_index_340_380 attribute ‘comment’ → text changed (from ‘Aerosol
index from 380 and 340 nm’ to ‘Aerosol index from 340 and 380 nm’)
In variable /PRODUCT/aerosol_index_340_380 attribute ‘long_name’ → text changed (from‘Aerosol index from 380 and 340 nm’ to ‘Aerosol index from 340 and 380 nm’)
In variable /PRODUCT/aerosol_index_335_367 attribute ‘comment’ → text changed (from ‘Aerosol
index from 335 and 367 nm’ to ‘Aerosol index from 335 and 367 nm’)
In variable /PRODUCT/aerosol_index_335_367 attribute ‘long_name’ → text changed (from‘Aerosol index from 335 and 367 nm’ to ‘Aerosol index from 335 and 367 nm’)
In variable /PRODUCT/aerosol_index_354_388_precision attribute ‘comment’ → text changed(from ‘Precision of aerosol index from 388 and 354 nm’ to ‘Precision of aerosol index from 354 and 388 nm’)
In variable /PRODUCT/aerosol_index_354_388_precision attribute ‘long_name’ → text changed(from ‘Precision of aerosol index from 388 and 354 nm’ to ‘Precision of aerosol index from 354 and 388 nm’)
In variable /PRODUCT/aerosol_index_340_380_precision attribute ‘comment’ → text changed(from ‘Precision of aerosol index from 380 and 340 nm’ to ‘Precision of aerosol index from 340 and 380 nm’)
In variable /PRODUCT/aerosol_index_340_380_precision attribute ‘long_name’ → text changed(from ‘Precision of aerosol index from 380 and 340 nm’ to ‘Precision of aerosol index from 340 and 380 nm’)
In variable /PRODUCT/aerosol_index_335_367_precision attribute ‘comment’ → text changed(from ‘Precision of aerosol index from 335 and 367 nm’ to ‘Precision of aerosol index from 335 and 367 nm’)
In variable /PRODUCT/aerosol_index_335_367_precision attribute ‘long_name’ → text changed(from ‘Precision of aerosol index from 335 and 367 nm’ to ‘Precision of aerosol index from 335 and 367 nm’)
In variable /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/wavelength_calibration_offset
attribute ‘long_name’ → text changed (from ‘wavelength offset’ to ‘radiance wavelength offset’)In variable /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/wavelength_calibration_offset_precisionattribute ‘long_name’ → text changed (from ‘wavelength offset precision’ to ‘radiance wavelength offset precision’In variable /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/wavelength_calibration_stretch
attribute ‘long_name’ → text changed (from ‘wavelength stretch’ to ‘radiance wavelength stretch’)In variable /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/wavelength_calibration_stretch_precisionattribute ‘long_name’ → text changed (from ‘wavelength stretch precision’ to ‘radiance wavelength stretch precision’)S5P MPC Product Readme UV Aerosol Index V02.05.00
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In variable /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/wavelength_calibration_chi_square
attribute ‘long_name’ → text changed (from ‘wavelength calibration chi square’ to ‘radiance wavelength
calibration chi square’)In variable /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/wavelength_calibration_irradiance_chi_square
attribute ‘long_name’ → text changed (from ‘wavelength calibration irradiance chi squared’ to ‘irradiancewavelength calibration chi squared’)
6.1.2

Version 02.04.00

New fields added/PRODUCT/aerosol_index_335_367/PRODUCT/aerosol_index_335_367_precision/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/scene_albedo_367/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/scene_albedo_367_precision/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/reflectance_measured_335/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/reflectance_measured_335_precision/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/reflectance_measured_367/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/reflectance_measured_367_precision/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/reflectance_calculated_335/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/reflectance_calculated_335_precision/METADATA/QA_STATISTICS/aerosol_index_335_367_histogram_axis (dimension)/METADATA/QA_STATISTICS/aerosol_index_335_367_pdf_axis (dimension)/METADATA/QA_STATISTICS/aerosol_index_335_367_histogram_axis/METADATA/QA_STATISTICS/aerosol_index_335_367_pdf_axis/METADATA/QA_STATISTICS/aerosol_index_335_367_histogram_bounds/METADATA/QA_STATISTICS/aerosol_index_335_367_pdf_bounds/METADATA/QA_STATISTICS/aerosol_index_335_367_histogram/METADATA/QA_STATISTICS/aerosol_index_335_367_pdf/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]
6.1.3

Version 02.03.01

Attribute fields with text changes/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/wavelength_calibration_irradiance_offset
attribute ‘long_name’ → text changed (from ‘wavelength offset’ to ‘irradiance wavelength offset’)/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/wavelength_calibration_irradiance_offset
attribute ‘ancillary_variables’ → text changed (from ‘wavelength_calibration_offset_precision’ to‘wavelength_calibration_irradiance_offset_precision’)
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

Removed fields/METADATA/ISO_METADATA/gmd:identificationInfo/gmd:spatialResolution

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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 Access Hub and canbe identified by the file class ‘RPRO’ in the filenames. The collection identifier is ‘03’, the same used forthe operational 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 3) due to theunavailability of Level 0 (L0) input data during the full mission reprocessing campaign.

Orbit

Gap start time

Gap stop time

3546
9755

20/06/2018 08:31:35

20/06/2018 08:51:37

31/08/2019 23:46:24

01/09/2019 00:06:25

10782
19782
19785
20254

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 3: 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/toolsForfurtherquestionsregarding
EOSupport@Copernicus.esa.int.

S5P/TROPOMI

data

products

pleasecontact

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]

Sentinel-5 precursor/TROPOMI Level 2 Algorithm Theoretical Basis Document UV
Aerosol Index
source: KNMI; ref: S5P-KNMI-L2-0008-RP;
url: https://sentinels.copernicus.eu/documents/247904/2476257/Sentinel-5PTROPOMI-ATBD-UV-Aerosol-Index[RD03]

Sentinel-5 precursor/TROPOMI Level 2 Product User Manual UV Aerosol Index
source: KNMI; ref: S5P-KNMI-L2-0026-MA;
url: https://sentinels.copernicus.eu/documents/247904/2474726/Sentinel-5P-Level-2Product-User-Manual-Aerosol-Index-product[RD04]

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.

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Abbreviations and acronyms(A)AI(Absorbing) Aerosol Index

ATBD

Algorithm Theoretical Basis Document

BIRA-IASBRoyal Belgian Institute for Space Aeronomy

DLR

German Aerospace Center / Deutsches Zentrum für Luft- und Raumfahrt

DOI

Digital Object Identifier

ESA

European Space Agency

ESL

Expert Support Laboratory

KNMI

Royal Netherlands Meteorological Institute / Koninlijk Nederlands
Meteorologisch Instituut

LER

Lambertian-Equivalent Reflectivity

MPC

Mission Performance Centre

MPIC

Max Planck Institut für Chemie

NASA

National Aeronautics and Space Administration

NRTI

Near Real TIme (timeliness of products)

OFFL

Offline (timeliness of products)

OMI

Ozone Monitoring Instrument

OMPS

Ozone Mapper and Profiling Suite

PRF

Product Readme File

PUM

Product User Manual

QWG

Quality Working GroupROCVR

Routine Operations Consolidated Validation Reports

S5P

Sentinel-5 Precursor

S5PVT

Sentinel-5 Precursor Validation TeamTROPOMI

Tropospheric Monitoring Instrument

UVAI

UV Aerosol Index

VDAF

Validation Data Analysis Facility