Dataset
Sentinel 5P: Nitrogen Dioxide (NO2) Total Column level 2 data
Abstract
Sentinel 5 Precursor (S5P) was launched on the 13th of October 2017 carrying the TROPOspheric Monitoring Instrument (TROPOMI). These data products provide geolocated total, tropospheric, or stratospheric Nitrogen dioxide concentrations. The TROPOMI NO2 data products pose an improvement over previous NO2 data sets, particularly in their unprecedented spatial resolution (7×3.5 km2), but also in the separation of the stratospheric and tropospheric contributions of the retrieved slant columns, and in the calculation of the air-mass factors used to convert slant to total columns.
Nitrogen dioxide (NO2) and nitrogen oxide (NO) together are usually referred to as nitrogen oxides (NOx = NO + NO2). They are important trace gases in the Earth’s atmosphere, present in both the troposphere and the stratosphere. They enter the atmosphere as a result of anthropogenic activities (notably fossil fuel combustion and biomass burning) and natural processes (such as microbiological processes in soils, wildfires and lightning). During the daytime, i.e. in the presence of sunlight, a photochemical cycle involving ozone (O3) converts NO into NO2 (and vice versa) on a timescale of minutes, so that NO2 is a robust measure for concentrations of nitrogen oxides. Tropospheric and stratospheric concentrations of NO2 are monitored all over the world by a variety of instruments either ground-based, in-situ (balloon, aircraft), or satellite-based each with its own specific advantages.
Details
Previous Info: |
No news update for this record
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Previously used record identifiers: |
No related previous identifiers.
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Access rules: |
Access to these data is available to any registered CEDA user. Please Login or Register for an account to gain access.
Use of these data is covered by the following licence: https://sentinel.esa.int/documents/247904/690755/Sentinel_Data_Legal_Notice. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record. |
Data lineage: |
Data collected and prepared by European Space Agency (ESA). Downloaded from the Collaborative Hub for use by CEDA users. |
Data Quality: |
See dataset associated documentation.
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File Format: |
These data are in NetCDF format.
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Process overview
Instrument/Platform pairings
TROPOspheric Monitoring Instrument (TROPOMI) | Deployed on: Sentinel 5 Precursor |
Computation Element: 1
Title | Level 2 Nitrogen Dioxide (NO2) total column processing algorithm applied to Sentinel 5P TROPOspheric Monitoring Instrument (TROPOMI) raw data |
Abstract | This computation involves the Level 2 processing algorithm applied to raw TROPOspheric Monitoring Instrument (TROPOMI) data. The TROPOMI NO2 processing system is based on the DOMINO and QA4ECV processing systems, with improvements related to specific TROPOMI aspects and new scientific insights. The basis for the processing at KNMI is a retrieval-assimilation-modeling system that uses the 3-dimensional global TM5 chemistry transport model as an essential element. The retrieval consists of a three-step procedure, performed on each measured Level-1b spectrum: 1. the retrieval of a total NO2 slant column density (Ns) from the Level-1b radiance and irradiance spectra measured by TROPOMI using a DOAS (Differential Optical Absorption Spectroscopy) method, 2. the separation of the Ns into a stratospheric and a tropospheric part on the basis of information coming from a data assimilation system, and 3. the conversion of the tropospheric slant column density into a tropospheric vertical column density and of the stratospheric slant column density into a stratospheric vertical column density, by applying an appropriate AMF based on a look-up table of altitude-dependent AMFs and actual, daily information on the vertical distribution of NO2 from the TM5-MP model on a 1-degree by 1-degree grid. The altitude-dependent AMF depends on the satellite geometry, terrain height, cloud fraction and height and surface albedo. These steps are described in detail in the ATBD document. |
Input Description | None |
Output Description | None |
Software Reference | None |
Output Description | None |
No variables found.
Temporal Range
2018-06-27T23:00:00
Ongoing
Geographic Extent
90.0000° |
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-180.0000° |
180.0000° |
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-90.0000° |