S5P_L2_NO2
Variables
The table below lists the variables that are present in the HARP product that results from an ingestion of S5P_L2_NO2 data.
| field name | type | dimensions | unit | description | 
|---|---|---|---|---|
| scan_subindex | int16 | {time} | pixel index (0-based) within the scanline | |
| datetime_start | double | {time} | [seconds since 2010-01-01] | start time of the measurement | 
| datetime_length | double | [s] | duration of the measurement | |
| orbit_index | int32 | absolute orbit number | ||
| validity | int32 | {time} | processing quality flag | |
| latitude | float | {time} | [degree_north] | latitude of the ground pixel center (WGS84) | 
| longitude | float | {time} | [degree_east] | longitude of the ground pixel center (WGS84) | 
| latitude_bounds | float | {time, 4} | [degree_north] | latitudes of the ground pixel corners (WGS84) | 
| longitude_bounds | float | {time, 4} | [degree_east] | longitudes of the ground pixel corners (WGS84) | 
| sensor_latitude | float | {time} | [degree_north] | latitude of the geodetic sub-satellite point (WGS84) | 
| sensor_longitude | float | {time} | [degree_east] | longitude of the goedetic sub-satellite point (WGS84) | 
| sensor_altitude | float | {time} | [m] | altitude of the satellite with respect to the geodetic sub-satellite point (WGS84) | 
| solar_zenith_angle | float | {time} | [degree] | zenith angle of the Sun at the ground pixel location (WGS84); angle measured away from the vertical | 
| solar_azimuth_angle | float | {time} | [degree] | azimuth angle of the Sun at the ground pixel location (WGS84); angle measured East-of-North | 
| sensor_zenith_angle | float | {time} | [degree] | zenith angle of the satellite at the ground pixel location (WGS84); angle measured away from the vertical | 
| sensor_azimuth_angle | float | {time} | [degree] | azimuth angle of the satellite at the ground pixel location (WGS84); angle measured East-of-North | 
| pressure_bounds | double | {time, vertical, 2} | [Pa] | pressure boundaries | 
| tropospheric_NO2_column_number_density | float | {time} | [mol/m^2] | tropospheric vertical column of NO2 | 
| tropospheric_NO2_column_number_density_uncertainty | float | {time} | [mol/m^2] | uncertainty of the tropospheric vertical column of NO2 (standard error) | 
| tropospheric_NO2_column_number_density_validity | int8 | {time} | continuous quality descriptor, varying between 0 (no data) and 100 (full quality data) | |
| tropospheric_NO2_column_number_density_amf | float | {time} | [] | tropospheric air mass factor, computed by integrating the altitude dependent air mass factor over the atmospheric layers from the surface up to and including the layer with the tropopause | 
| tropospheric_NO2_column_number_density_avk | float | {time, vertical} | [] | averaging kernel for the tropospheric vertical column number density of NO2 | 
| NO2_column_number_density | float | {time} | [mol/m^2] | total vertical column of NO2 (ratio of the slant column density of NO2 and the total air mass factor) | 
| NO2_column_number_density_uncertainty | float | {time} | [mol/m^2] | uncertainty of the total vertical column of NO2 (standard error) | 
| NO2_column_number_density_amf | float | {time} | [] | total air mass factor, computed by integrating the altitude dependent air mass factor over the atmospheric layers from the surface to top-of-atmosphere | 
| NO2_column_number_density_avk | float | {time, vertical} | [] | averaging kernel for the air mass factor correction, describing the NO2 profile sensitivity of the vertical column density | 
| stratospheric_NO2_column_number_density | float | {time} | [mol/m^2] | stratospheric vertical column of NO2 | 
| stratospheric_NO2_column_number_density_uncertainty | float | {time} | [mol/m^2] | uncertainty of the stratospheric vertical column of NO2 (standard error) | 
| stratospheric_NO2_column_number_density_amf | float | {time} | [] | stratospheric air mass factor | 
| stratospheric_NO2_column_number_density_avk | float | {time, vertical} | [] | averaging kernel for the stratospheric vertical column number density of NO2 | 
| NO2_slant_column_number_density | float | {time} | [mol/m^2] | slant column of NO2 | 
| NO2_slant_column_number_density_uncertainty | float | {time} | [mol/m^2] | uncertainty of the slant column of NO2 | 
| cloud_fraction | float | {time} | [] | cloud fraction for NO2 fitting window | 
| absorbing_aerosol_index | float | {time} | [] | aerosol index | 
| cloud_albedo | float | {time} | [] | cloud albedo | 
| cloud_pressure | float | {time} | [Pa] | cloud pressure | 
| scene_albedo | float | {time} | [] | scene albedo | 
| scene_pressure | float | {time} | [Pa] | apparent scene pressure | 
| surface_albedo | float | {time} | [] | surface albedo | 
| surface_altitude | float | {time} | [m] | surface altitude | 
| surface_altitude_uncertainty | float | {time} | [m] | surface altitude precision | 
| surface_pressure | float | {time} | [Pa] | surface pressure | 
| surface_meridional_wind_velocity | float | {time} | [m/s] | northward wind | 
| surface_zonal_wind_velocity | float | {time} | [m/s] | eastward wind | 
| snow_ice_type | int8 | {time} | surface snow/ice type; enumeration values: snow_free_land (0), sea_ice (1), permanent_ice (2), snow (3), ocean (4) | |
| sea_ice_fraction | float | {time} | [] | sea-ice concentration (as a fraction) | 
| tropopause_pressure | double | {time} | [Pa] | tropopause pressure | 
| index | int32 | {time} | zero-based index of the sample within the source product | 
Ingestion options
The table below lists the available ingestion options for S5P_L2_NO2 products.
| option name | legal values | description | 
|---|---|---|
| data | o22cld | whether to ingest the NO2 data (default) or the O2-O2 cloud data (data=o22cld) | 
| total_column | summed, total | whether to use nitrogendioxide_total_column (which is derived from the total slant column diveded by the total amf) or nitrogendioxide_summed_total_column (which is the sum of the retrieved tropospheric and stratospheric columns); option values are ‘summed’ (default) and ‘total’ | 
| cloud_fraction | radiance | whether to ingest the cloud fraction (default) or the radiance cloud fraction (cloud_fraction=radiance) for the NO2 data | 
This definition is only applicable when: data unset
Mapping description
The table below details where and how each variable was retrieved from the input product.
| field name | mapping description | |
|---|---|---|
| scan_subindex | description | the scanline and pixel dimensions are collapsed into a temporal dimension; the index of the pixel within the scanline is computed as the index on the temporal dimension modulo the number of scanlines | 
| datetime_start | path | /PRODUCT/time, /PRODUCT/delta_time[] | 
| description | time converted from milliseconds since a reference time (given as seconds since 2010-01-01) to seconds since 2010-01-01 (using 86400 seconds per day); the time associated with a scanline is repeated for each pixel in the scanline | |
| datetime_length | path | /@time_coverage_resolution | 
| description | the measurement length is parsed assuming the ISO 8601 ‘PT%(interval_seconds)fS’ format | |
| orbit_index | path | /@orbit | 
| validity | path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/processing_quality_flags[] | 
| description | the uint32 data is cast to int32 | |
| latitude | path | /PRODUCT/latitude[] | 
| longitude | path | /PRODUCT/longitude[] | 
| latitude_bounds | path | /PRODUCT/SUPPORT_DATA/GEOLOCATIONS/latitude_bounds[] | 
| longitude_bounds | path | /PRODUCT/SUPPORT_DATA/GEOLOCATIONS/longitude_bounds[] | 
| sensor_latitude | path | /PRODUCT/SUPPORT_DATA/GEOLOCATIONS/satellite_latitude[] | 
| description | the satellite latitude associated with a scanline is repeated for each pixel in the scanline | |
| sensor_longitude | path | /PRODUCT/SUPPORT_DATA/GEOLOCATIONS/satellite_longitude[] | 
| description | the satellite longitude associated with a scanline is repeated for each pixel in the scanline | |
| sensor_altitude | path | /PRODUCT/SUPPORT_DATA/GEOLOCATIONS/satellite_altitude[] | 
| description | the satellite altitude associated with a scanline is repeated for each pixel in the scanline | |
| solar_zenith_angle | path | /PRODUCT/SUPPORT_DATA/GEOLOCATIONS/solar_zenith_angle[] | 
| solar_azimuth_angle | path | /PRODUCT/SUPPORT_DATA/GEOLOCATIONS/solar_azimuth_angle[] | 
| sensor_zenith_angle | path | /PRODUCT/SUPPORT_DATA/GEOLOCATIONS/viewing_zenith_angle[] | 
| sensor_azimuth_angle | path | /PRODUCT/SUPPORT_DATA/GEOLOCATIONS/viewing_azimuth_angle[] | 
| pressure_bounds | path | /PRODUCT/tm5_constant_a[], /PRODUCT/tm5_constant_b[], /PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_pressure[] | 
| description | pressure in Pa at level k is derived from surface pressure in Pa as: tm5_constant_a[k] + tm5_constant_b[k] * surface_pressure[]; the top of atmosphere pressure is clamped to 1e-3 Pa | |
| tropospheric_NO2_column_number_density | path | /PRODUCT/nitrogendioxide_tropospheric_column[] | 
| tropospheric_NO2_column_number_density_uncertainty | path | /PRODUCT/nitrogendioxide_tropospheric_column_precision[] | 
| tropospheric_NO2_column_number_density_validity | path | /PRODUCT/qa_value | 
| tropospheric_NO2_column_number_density_amf | path | /PRODUCT/air_mass_factor_troposphere[] | 
| tropospheric_NO2_column_number_density_avk | path | /PRODUCT/averaging_kernel[], /PRODUCT/air_mass_factor_total[], /PRODUCT/air_mass_factor_troposphere[], /PRODUCT/tm5_tropopause_layer_index[] | 
| description | averaging_kernel[layer] = if layer <= tm5_tropopause_layer_index then averaging_kernel[layer] * air_mass_factor_total / air_mass_factor_troposphere else 0 | |
| NO2_column_number_density | condition | total_column=summed or total_column unset | 
| path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/nitrogendioxide_summed_total_column[] | |
| condition | total_column=total | |
| path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/nitrogendioxide_total_column[] | |
| NO2_column_number_density_uncertainty | condition | total_column=summed or total_column unset | 
| path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/nitrogendioxide_summed_total_column_precision[] | |
| condition | total_column=total | |
| path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/nitrogendioxide_total_column_precision[] | |
| NO2_column_number_density_amf | path | /PRODUCT/air_mass_factor_total[] | 
| NO2_column_number_density_avk | path | /PRODUCT/averaging_kernel[] | 
| stratospheric_NO2_column_number_density | path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/nitrogendioxide_stratospheric_column[] | 
| stratospheric_NO2_column_number_density_uncertainty | path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/nitrogendioxide_stratospheric_column_precision[] | 
| stratospheric_NO2_column_number_density_amf | path | /PRODUCT/air_mass_factor_troposphere[] | 
| stratospheric_NO2_column_number_density_avk | path | /PRODUCT/averaging_kernel[], /PRODUCT/air_mass_factor_total[], /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/air_mass_factor_stratosphere[], /PRODUCT/tm5_tropopause_layer_index[] | 
| description | averaging_kernel[layer] = if layer > tm5_tropopause_layer_index then averaging_kernel[layer] * air_mass_factor_total / air_mass_factor_stratosphere else 0 | |
| NO2_slant_column_number_density | path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/nitrogendioxide_slant_column_density[] | 
| NO2_slant_column_number_density_uncertainty | path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/nitrogendioxide_slant_column_density_precision[] | 
| cloud_fraction | condition | cloud_fraction unset | 
| path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/cloud_fraction_crb_nitrogendioxide_window[] | |
| condition | cloud_fraction=radiance | |
| path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/cloud_radiance_fraction_nitrogendioxide_window[] | |
| absorbing_aerosol_index | path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/aerosol_index_354_388 | 
| cloud_albedo | path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/cloud_albedo_crb | 
| cloud_pressure | path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/cloud_pressure_crb | 
| scene_albedo | path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/scene_albedo | 
| scene_pressure | path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/apparent_scene_pressure | 
| surface_albedo | path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_albedo_nitrogendioxide_window | 
| surface_altitude | path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_altitude[] | 
| surface_altitude_uncertainty | path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_altitude_precision[] | 
| surface_pressure | path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_pressure[] | 
| surface_meridional_wind_velocity | available | optional | 
| condition | processor version >= 01.03.00 | |
| path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/northward_wind[] | |
| surface_zonal_wind_velocity | available | optional | 
| condition | processor version >= 01.03.00 | |
| path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/eastward_wind[] | |
| snow_ice_type | path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/snow_ice_flag[] | 
| description | 0: snow_free_land (0), 1-100: sea_ice (1), 101: permanent_ice (2), 103: snow (3), 255: ocean (4), other values map to -1 | |
| sea_ice_fraction | path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/snow_ice_flag[] | 
| description | if 1 <= snow_ice_flag <= 100 then snow_ice_flag/100.0 else 0.0 | |
| tropopause_pressure | path | /PRODUCT/tm5_constant_a[], /PRODUCT/tm5_constant_b[], /PRODUCT/tm5_tropopause_layer_index[], /PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_pressure[] | 
| description | pressure in Pa at tropause is derived from the upper bound of the layer with tropopause layer index k: tm5_constant_a[k + 1] + tm5_constant_b[k + 1] * surface_pressure[] | |