Dataset
Sentinel 5P: Nitrogen Dioxide (NO2) Total Column level 2 data
Latest Data Update: 2023-06-13
Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2021-05-21
Download Stats: last 12 months
Dataset Size: 545.37K Files | 20TB
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.
Citable as: Copernicus; European Space Agency (2021): Sentinel 5P: Nitrogen Dioxide (NO2) Total Column level 2 data. Centre for Environmental Data Analysis, date of citation. https://catalogue.ceda.ac.uk/uuid/e34eaffcf6bb4f3c87fffe0814f5c9bf
Abbreviation: Not defined
Keywords: Sentinel 5P, Nitrogen Dioxide, NO2, ESA
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: |
Public data: access to these data is available to both registered and non-registered users.
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
This dataset was generated by a combination of instruments deployed on platforms
and computations as detailed below.
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 |
- units: 1
- var_id: aerosol_index_354_388
- long_name: Absorbing aerosol index from the TROPOMI AAI product
- units: mol m-2
- var_id: nitrogendioxide_slant_column_density_stripe_amplitude
- long_name: Across-track NO2 slant column stripe offset, 7-day mean, determined over the Pacific Ocean
- units: 1
- var_id: air_mass_factor_cloudy
- long_name: Air mass factor for the cloud-covered part of the scene
- units: 1
- var_id: air_mass_factor_clear
- long_name: Air mass factor for the cloud-free part of the scene
- units: 1
- long_name: Averaging kernel
- var_id: averaging_kernel
- units: 1
- var_id: chi_square
- long_name: Chi squared of fit
- units: 1
- standard_name: cloud_albedo
- var_id: cloud_albedo_crb
- long_name: Cloud albedo in the cloud product
- units: 1
- var_id: cloud_fraction_crb_nitrogendioxide_window
- long_name: Cloud fraction at 439 nm for NO2 retrieval
- units: 1
- var_id: cloud_fraction_crb_nitrogendioxide_window
- long_name: Cloud fraction at 440 nm for NO2 retrieval
- units: Pa
- var_id: cloud_pressure_crb
- long_name: Cloud optical centroid pressure
- units: 1
- var_id: cloud_selection_flag
- long_name: Cloud product selection flag
- units: 1
- var_id: cloud_radiance_fraction_nitrogendioxide_window
- long_name: Cloud radiance fraction at 440 nm for NO2 retrieval
- units: 1
- var_id: degrees_of_freedom
- long_name: Degrees of freedom from slant column fit
- units: m s-1
- standard_name: eastward_wind
- var_id: eastward_wind
- long_name: Eastward wind from ECMWF at 10 meter height level
- units: 1
- var_id: cloud_fraction_crb
- long_name: Effective cloud fraction from the cloud product
- units: 1
- var_id: ring_coefficient
- long_name: Fit coefficient of the Ring effect
- units: mol m-2
- var_id: nitrogendioxide_ghost_column
- long_name: Ghost column NO2: modelled NO2 column below the cloud top
- units: mol m-2
- var_id: nitrogendioxide_stratospheric_column_histogram_axis
- long_name: Histogram of the stratospheric NO2 vertical column
- units: mol m-2
- var_id: nitrogendioxide_total_column_histogram_axis
- long_name: Histogram of the total NO2 vertical column
- units: mol m-2
- var_id: nitrogendioxide_tropospheric_column_histogram_axis
- long_name: Histogram of the tropospheric NO2 vertical column
- var_id: instrument_configuration_identifier
- long_name: IcID
- var_id: instrument_configuration_version
- long_name: IcVersion
- var_id: surface_classification
- long_name: Land-water mask and surface classification based on a static database
- units: m
- var_id: water_liquid_slant_column_density
- long_name: Liquid water column
- units: mol m-2
- var_id: nitrogendioxide_slant_column_density
- long_name: NO2 slant column density
- units: mol m-2
- var_id: nitrogendioxide_slant_column_density_precision
- long_name: NO2 slant column density precision
- units: m s-1
- standard_name: northward_wind
- var_id: northward_wind
- long_name: Northward wind from ECMWF at 10 meter height level
- var_id: number_of_spectral_points_in_retrieval
- long_name: Number of spectral points used in the retrieval
- units: 1
- var_id: o22cld_oxygen_oxygen_dimer_slant_column_density_correction_factor
- long_name: O2-O2 slant column density temperature profile correction factor
- units: mol m-2
- var_id: ozone_slant_column_density
- long_name: O3 slant column density
- units: mol m-2
- var_id: ozone_slant_column_density_precision
- long_name: O3 slant column density precision
- units: 1
- var_id: intensity_offset_coefficients
- long_name: Polynomial coefficients of the DOAS fit
- units: 1
- var_id: intensity_offset_coefficients
- long_name: Polynomial coefficients of the intensity offset
- units: 1
- var_id: polynomial_exponents
- long_name: Polynomial exponents for background polynomial
- units: 1
- var_id: intensity_offset_polynomial_exponents
- long_name: Polynomial exponents for intensity offset
- units: 1
- var_id: ring_coefficient_precision
- long_name: Precision of fit coefficient of the Ring effect
- units: m
- var_id: water_liquid_slant_column_density_precision
- long_name: Precision of liquid water column
- units: mol m-2
- var_id: nitrogendioxide_stratospheric_column_precision
- standard_name: stratosphere_mole_content_of_nitrogen_dioxide standard_error
- long_name: Precision of stratospheric vertical column of nitrogen dioxide
- units: 1
- var_id: intensity_offset_coefficients_precision
- long_name: Precision of the polynomial coefficients of the DOAS fit
- units: 1
- var_id: intensity_offset_coefficients_precision
- long_name: Precision of the polynomial coefficients of the intensity offset
- var_id: oxygen_oxygen_dimer_slant_column_density_precision
- long_name: Precision of the slant column density of oxygen collision induced absorption
- units: mol2 m-5
- units: mol m-2
- var_id: nitrogendioxide_summed_total_column_precision
- long_name: Precision of the sum of the tropospheric and stratospheric vertical columns
- units: mol m-2
- var_id: nitrogendioxide_total_column_precision
- long_name: Precision of the total vertical column of nitrogen dioxide derived from the total slant column and TM5 profile in stratosphere and troposphere
- units: mol m-2
- var_id: nitrogendioxide_total_column_precision_kernel
- long_name: Precision of the total vertical column of nitrogen dioxide derived from the total slant column and TM5 profile in stratosphere and troposphere, when the averaging kernel is applied
- units: mol m-2
- var_id: nitrogendioxide_tropospheric_column_precision
- standard_name: troposphere_mole_content_of_nitrogen_dioxide standard_error
- long_name: Precision of the tropospheric vertical column of nitrogen dioxide
- units: mol m-2
- standard_name: troposphere_mole_content_of_nitrogen_dioxide standard_error
- var_id: nitrogendioxide_tropospheric_column_precision_kernel
- long_name: Precision of the tropospheric vertical column of nitrogen dioxide when applying the averaging kernel
- units: mol m-2
- var_id: water_slant_column_density_precision
- long_name: Precision of water vapor slant column density
- units: mol m-2
- var_id: nitrogendioxide_stratospheric_column_pdf_axis
- long_name: Probability density function of the stratospheric NO2 vertical column
- units: mol m-2
- var_id: nitrogendioxide_total_column_pdf_axis
- long_name: Probability density function of the total NO2 vertical column
- units: mol m-2
- var_id: nitrogendioxide_tropospheric_column_pdf_axis
- long_name: Probability density function of the tropospheric NO2 vertical column
- long_name: Processing quality flags
- var_id: processing_quality_flags
- units: 1
- var_id: root_mean_square_error_of_fit
- long_name: Root mean square residual of the fit
- units: 1
- var_id: scene_albedo
- long_name: Scene albedo in the cloud product
- units: Pa
- var_id: apparent_scene_pressure
- long_name: Scene pressure from the cloud product
- units: mol2 m-5
- var_id: oxygen_oxygen_dimer_slant_column_density
- long_name: Slant column density of oxygen collision induced absorption
- var_id: snow_ice_flag
- long_name: Snow-ice mask
- units: 1
- var_id: air_mass_factor_stratosphere
- long_name: Stratospheric air mass factor
- units: mol m-2
- var_id: nitrogendioxide_stratospheric_column
- standard_name: stratosphere_mole_content_of_nitrogen_dioxide
- long_name: Stratospheric vertical column of nitrogen dioxide, derived from the TM5-MP vertical profiles
- units: mol m-2
- var_id: nitrogendioxide_summed_total_column
- long_name: Sum of the tropospheric and stratospheric vertical columns
- units: 1
- standard_name: surface_albedo
- var_id: surface_albedo_nitrogendioxide_window
- long_name: Surface albedo in the NO2 fit window
- units: 1
- standard_name: surface_albedo
- var_id: surface_albedo
- long_name: Surface albedo in the cloud product
- units: m
- standard_name: surface_altitude
- var_id: surface_altitude
- long_name: Surface altitude
- units: Pa
- standard_name: surface_air_pressure
- long_name: Surface pressure
- var_id: surface_pressure
- units: 1
- standard_name: atmosphere_hybrid_sigma_pressure_coordinate
- var_id: layer
- long_name: TM5 atmospheric layer numbers
- units: 1
- var_id: vertices
- long_name: TM5 atmospheric layer upper and lower bound indices
- units: Pa
- var_id: tm5_constant_a
- long_name: TM5 hybrid A coefficient at upper and lower interface levels
- units: 1
- var_id: tm5_constant_b
- long_name: TM5 hybrid B coefficient at upper and lower interface levels
- units: 1
- var_id: tm5_tropopause_layer_index
- long_name: TM5 layer index of the highest layer in the tropopause
- var_id: time_utc
- long_name: Time of observation as ISO 8601 date-time string
- units: 1
- var_id: air_mass_factor_total
- long_name: Total air mass factor
- units: mol m-2
- var_id: nitrogendioxide_total_column
- long_name: Total vertical column of nitrogen dioxide derived from the total slant column and TM5 profile in stratosphere and troposphere
- units: 1
- var_id: air_mass_factor_troposphere
- long_name: Tropospheric air mass factor
- units: mol m-2
- var_id: nitrogendioxide_tropospheric_column
- standard_name: troposphere_mole_content_of_nitrogen_dioxide
- long_name: Tropospheric vertical column of nitrogen dioxide
- units: mol m-2
- var_id: water_slant_column_density
- long_name: Water vapor slant column density
- units: 1
- var_id: ground_pixel
- long_name: across-track dimension index
- units: Pa
- long_name: air_pressure_at_cloud_optical_centroid
- var_id: fresco_cloud_pressure_crb
- units: Pa
- var_id: o22cld_cloud_pressure_crb_precision
- long_name: air_pressure_at_cloud_optical_centroid standard_error
- units: Pa
- var_id: o22cld_apparent_scene_pressure
- long_name: air_pressure_at_cloud_optical_centroid_assuming_completely_cloudy_sky
- units: Pa
- var_id: o22cld_apparent_scene_pressure_precision
- long_name: air_pressure_at_cloud_optical_centroid_assuming_completely_cloudy_sky standard_error
- units: 1
- var_id: scanline
- long_name: along-track dimension index
- units: 1
- standard_name: surface_albedo
- var_id: o22cld_surface_albedo
- long_name: assumed surface albedo at 475 nm
- units: 1
- standard_name: surface_albedo
- var_id: fresco_surface_albedo
- long_name: assumed surface albedo at 758 nm
- units: 1
- var_id: o22cld_chi_square
- long_name: chi squared parameter of O2-O2 cloud fit
- units: 1
- standard_name: cloud_albedo
- var_id: o22cld_cloud_albedo_crb
- long_name: cloud albedo
- units: 1
- var_id: o22cld_scene_albedo
- long_name: cloud_albedo_assuming_completely_cloudy_sky
- units: 1
- var_id: o22cld_scene_albedo_precision
- long_name: cloud_albedo_assuming_completely_cloudy_sky standard_error
- units: 1
- var_id: o22cld_continuum_at_reference_wavelength
- long_name: continuum_reflectance_at_reference_wavelength
- units: 1
- var_id: o22cld_continuum_at_reference_wavelength_precision
- long_name: continuum_reflectance_at_reference_wavelength standard_error
- units: 1
- var_id: qa_value
- long_name: data quality value
- units: 1
- var_id: o22cld_cloud_fraction_crb
- long_name: effective_cloud_area_fraction_assuming_fixed_cloud_albedo
- units: 1
- var_id: o22cld_cloud_fraction_crb_precision
- long_name: effective_cloud_area_fraction_assuming_fixed_cloud_albedo standard_error
- units: 1
- var_id: o22cld_polynomial_coefficient
- long_name: first_order_background_polynomial_coefficient
- units: 1
- var_id: o22cld_polynomial_coefficient_precision
- long_name: first_order_background_polynomial_coefficient standard_error
- units: 1
- var_id: satellite_orbit_phase
- long_name: fractional satellite orbit phase
- units: 1
- long_name: geolocation flags
- var_id: geolocation_flags
- units: 1
- long_name: ground pixel quality flag
- var_id: geolocation_flags
- units: m
- var_id: o22cld_cloud_height_crb
- long_name: height_of_cloud_optical_centroid
- units: m
- var_id: o22cld_cloud_height_crb_precision
- long_name: height_of_cloud_optical_centroid standard_error
- units: nm
- var_id: wavelength_calibration_irradiance_offset
- long_name: irradiance wavelength offset
- units: nm
- var_id: wavelength_calibration_irradiance_offset_precision
- long_name: irradiance wavelength offset precision
- var_id: latitude_bounds
- var_id: longitude_bounds
- var_id: nitrogendioxide_stratospheric_column_histogram
- var_id: nitrogendioxide_stratospheric_column_histogram_bounds
- var_id: nitrogendioxide_stratospheric_column_pdf
- var_id: nitrogendioxide_stratospheric_column_pdf_bounds
- var_id: nitrogendioxide_total_column_histogram
- var_id: nitrogendioxide_total_column_histogram_bounds
- var_id: nitrogendioxide_total_column_pdf
- var_id: nitrogendioxide_total_column_pdf_bounds
- var_id: nitrogendioxide_tropospheric_column_histogram
- var_id: nitrogendioxide_tropospheric_column_histogram_bounds
- var_id: nitrogendioxide_tropospheric_column_pdf
- var_id: nitrogendioxide_tropospheric_column_pdf_bounds
- units: 1
- var_id: number_of_iterations
- long_name: number of iterations
- units: milliseconds
- var_id: delta_time
- long_name: offset from reference start time of measurement
- units: milliseconds
- var_id: delta_time
- long_name: offset of start time of measurement relative to time_reference
- units: 1
- var_id: corner
- long_name: pixel corner index
- units: 1
- var_id: o22cld_ring_coefficient
- long_name: ring_coefficient
- units: 1
- var_id: o22cld_ring_coefficient_precision
- long_name: ring_coefficient standard_error
- units: m
- var_id: satellite_altitude
- long_name: satellite altitude
- units: degrees_east
- var_id: satellite_longitude
- long_name: satellite_longitude
- units: 1
- var_id: scaled_small_pixel_variance
- long_name: scaled small pixel variance
- units: mol m-2
- var_id: o22cld_nitrogendioxide_slant_column_density
- long_name: slant_column_density_of_nitrogen_dioxide
- units: mol m-2
- var_id: o22cld_nitrogendioxide_slant_column_density_precision
- long_name: slant_column_density_of_nitrogen_dioxide standard_error
- units: mol2 m-5
- var_id: o22cld_oxygen_oxygen_dimer_slant_column_density
- long_name: slant_column_density_of_oxygen_cia
- units: mol2 m-5
- var_id: o22cld_oxygen_oxygen_dimer_slant_column_density_precision
- long_name: slant_column_density_of_oxygen_cia standard_error
- units: mol m-2
- var_id: o22cld_ozone_slant_column_density
- long_name: slant_column_density_of_ozone
- units: mol m-2
- var_id: o22cld_ozone_slant_column_density_precision
- long_name: slant_column_density_of_ozone standard_error
- units: degree
- standard_name: solar_azimuth_angle
- long_name: solar azimuth angle
- var_id: solar_azimuth_angle
- units: degree
- long_name: solar zenith angle
- var_id: solar_zenith_angle
- standard_name: solar_zenith_angle
- units: degrees_north
- var_id: satellite_latitude
- long_name: sub satellite latitude
- units: m
- var_id: surface_altitude_precision
- standard_name: surface_altitude standard_error
- long_name: surface altitude precision
- units: degree
- standard_name: viewing_azimuth_angle
- long_name: viewing azimuth angle
- var_id: viewing_azimuth_angle
- units: degree
- long_name: viewing zenith angle
- standard_name: viewing_zenith_angle
- var_id: viewing_zenith_angle
- units: 1
- var_id: wavelength_calibration_chi_square
- long_name: wavelength calibration chi square
- units: 1
- var_id: wavelength_calibration_irradiance_chi_square
- long_name: wavelength calibration irradiance chi squared
- units: nm
- var_id: o22cld_wavelength_calibration_offset
- long_name: wavelength offset
- units: nm
- var_id: o22cld_wavelength_calibration_offset_precision
- long_name: wavelength offset precision
- units: nm
- var_id: o22cld_wavelength_calibration_irradiance_offset_precision
- long_name: wavelength offset precision for the O2-O2 cloud parameters
- units: 1
- var_id: o22cld_wavelength_calibration_stretch
- long_name: wavelength stretch
- units: 1
- var_id: o22cld_wavelength_calibration_stretch_precision
- long_name: wavelength stretch precision
Co-ordinate Variables
- units: degrees_north
- standard_name: latitude
- var_id: latitude
- long_name: pixel center latitude
- units: degrees_east
- standard_name: longitude
- var_id: longitude
- long_name: pixel center longitude
- standard_name: time
- var_id: time
- units: seconds
- long_name: reference time for the measurements
Coverage
Temporal Range
Start time:
2018-05-06T00:00:00
End time:
Ongoing
Geographic Extent
90.0000° |
||
-180.0000° |
180.0000° |
|
-90.0000° |
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