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 |
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/INPUT_DATA/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/INPUT_DATA/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[] |
|