Arctic lightning NO2 product (2020)
Description
The dataset includes results from a combination of TROPOMI NO2 measurements and GLD360 observations in the Arctic (June-August 2020). By analyzing consecutive TROPOMI NO2 observations, we determine the lifetime and production efficiency of lightning NO2. A detailed description of the methodology can be found in Zhang et al. (2023).
Reference
Zhang et al., Spaceborne observations of lightning NO2 in the Arctic, Environ. Sci. Technol.
Date files
These NetCDF files are generated by S5P-LNO2 which depends on TROPOMI NO2 data and GLD360 lightning data.
Here is the variable table of the S5P-LNO2 NetCDF product:
| Varname | Group | Units | Description |
|---|---|---|---|
| time | S5P | days since <yyyy-mm-dd> | time using proleptic gregorian calendar |
| latitude | S5P | degrees_north | pixel center latitude |
| longitude | S5P | degrees_east | pixel center longitude |
| air_mass_factor_clear | S5P | 1 | Air mass factor for the cloud-free part of the scene |
| air_mass_factor_cloudy | S5P | 1 | Air mass factor for the cloud-covered part of the scene |
| air_mass_factor_stratosphere | S5P | 1 | Stratospheric air mass factor |
| air_mass_factor_total | S5P | 1 | Total air mass factor |
| air_mass_factor_troposphere | S5P | 1 | Tropospheric air mass factor |
| Apparent_scene_pressure | S5P | Pa | Scene pressure from the cloud product |
| assembled_lat_bounds | S5P | degrees_north | assembled_latitude_bounds calculated by Satpy |
| assembled_lon_bounds | S5P | degrees_east | assembled_longitude_bounds calculated by Satpy |
| Averaging_kernel | S5P | 1 | Averaging kernel |
| cloud_albedo_crb | S5P | 1 | Cloud albedo in the cloud product |
| cloud_fraction_crb_nitrogendioxide_window | S5P | 1 | Cloud fraction at 440 nm for NO2 retrieval |
| cloud_pressure_crb | S5P | Pa | Cloud optical centroid pressure |
| cloud_radiance_fraction_nitrogendioxide_window | S5P | 1 | Cloud radiance fraction at 440 nm for NO2 retrieval |
| Geolocation_flags | S5P | 1 | Some flags (see ATBD) |
| lightning_mask | S5P | 1 | <0: labeled lightning with fire; 0: no lightning; >0: labeled lightning without fire |
| nitrogendioxide_ghost_column | S5P | mol m-2 | Ghost column NO2: modelled NO2 column below the cloud top |
| nitrogendioxide_segmentation | S5P | 1 | 0: no high NO2; >=1: labeled high NO2 |
| nitrogendioxide_slant_column_density | S5P | mol m-2 | Stratospheric vertical column of nitrogen dioxide, derived from the TM5-MP vertical profiles |
| nitrogendioxide_stratospheric_column | S5P | mol m-2 | Stratospheric vertical column of nitrogen dioxide, derived from the TM5-MP vertical profile |
| nitrogendioxide_total_column | S5P | mol m-2 | Total vertical column of nitrogen dioxide derived from the total slant column and TM5 profile in stratosphere and troposphere |
| nitrogendioxide_tropospheric_column | S5P | mol m-2 | Tropospheric vertical column of nitrogen dioxide |
| processing_quality_flags | S5P | 1 | Processing quality flags (See ATBD) |
| qa_value | S5P | 1 | Quality value |
| scene_albedo | S5P | 1 | Scene albedo in the cloud product |
| snow_ice_flag | S5P | 1 | Snow-ice mask (See ATBD) |
| solar_azimuth_angle | S5P | degree clockwise from the North (East = 90, South = 180, West = 270) | Solar azimuth angle at the ground pixel location on the reference ellipsoid. |
| solar_zenith_angle | S5P | degree measured away from the vertical | Solar zenith angle at the ground pixel location on the reference ellipsoid. |
| surface_albedo_nitrogendioxide_window | S5P | 1 | Surface albedo in the NO2 fit window |
| surface_pressure | S5P | Pa | Surface pressure |
| time_utc | S5P | 1 | Time of observation as ISO 8601 date-time string |
| tm5_constant_a | S5P | Pa | TM5 hybrid A coefficient at upper and lower interface levels |
| tm5_constant_b | S5P | Pa | TM5 hybrid B coefficient at upper and lower interface levels |
| tm5_tropopause_layer_index | S5P | 1 | TM5 layer index of the highest layer in the tropopause |
| viewing_azimuth_angle | S5P | degree measured clockwise from the North (East = 90, South = 180, West = 270) | Satellite azimuth angle at the ground pixel location on the reference ellipsoid. |
| viewing_zenith_angle | S5P | degree measured away from the vertical | Zenith angle of the satellite at the ground pixel location on the reference ellipsoid. |
| cluster_label | Lightning | 1 | Clustered lightning labeled by DBSCAN |
| time | Lightning | minutes since | |
| longitude | Lightning | degrees_east | Longitude of lightning |
| latitude | Lightning | degrees_north | Latitude of lightning |
| delta | Lightning | minute | The time difference between detected lightning and TROPOMI overpass time |
| level | Lightning | hPa | Pressure levels used for lightning NO2 air parcel |
| longitude_pred | Lightning | degrees_east | Longitude of lightning at different pressure levels predicted by ERA5 data |
| latitude_pred | Lightning | degrees_north | Latitude of lightning at different pressure levels predicted by ERA5 data |
| lightning_label | Lightning | 1 | Lightning label paired with lightning mask |
| time | Fire | 1 | |
| longitude | Fire | degrees_north | Longitude of fire |
| latitude | Fire | degrees_north | Longitude of fire |
| type | Fire | 1 | Fire type |
Files
Restricted
The record is publicly accessible, but files are restricted to users with access.
Request access
If you would like to request access to these files, please fill out the form below.
You need to satisfy these conditions in order for this request to be accepted:
This data set is only available to researchers who have applied for GLD360 data, please contact chris.vagasky@vaisala.co and xinzhang1215@gmail.com for access.
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