Arctic lightning NO2 product (2020)

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
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