# ESACCI_OZONE_L2_TC

## Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of `ESACCI_OZONE_L2_TC` data.

field name | type | dimensions | unit | description
--- | --- | --- | --- | ---
scan_subindex | int32 | {time} |  | zero-based index of the instantaneous field of view within the swath
datetime | double | {time} | [days since 1995-01-01] | time of the measurement
longitude | double | {time} | [degree_east] | longitude of the ground pixel center
latitude | double | {time} | [degree_north] | latitude of the ground pixel center
longitude_bounds | double | {time, 4} | [degree_east] | longitudes of the ground pixel corners
latitude_bounds | double | {time, 4} | [degree_north] | latitudes of the ground pixel corners
sensor_zenith_angle | double | {time} | [degree] | zenith angle of the sensor at the ground pixel center (< 0 for Eastern, > 0 for Western pixels)
solar_zenith_angle | double | {time} | [degree] | zenith angle of the Sun at the ground pixel center
relative_azimuth_angle | double | {time} | [degree] | relative azimuth angle at the ground pixel center
O3_column_number_density | double | {time} | [DU] | O3 total column number density
O3_column_number_density_uncertainty_random | double | {time} | [DU] | random uncertainty of the O3 total column number density
temperature | double | {time} | [K] | retrieved effective temperature
cloud_fraction | double | {time} | [] | effective cloud fraction
cloud_top_pressure | double | {time} | [Pa] | cloud top pressure
cloud_top_albedo | double | {time} | [] | effective cloud top albedo
scene_pressure | double | {time} | [Pa] | pressure at the effective scene used for the retrieval
scene_albedo | double | {time} | [] | retrieved effective albedo of the scene
surface_albedo | double | {time} | [] | minimum surface albedo at 335nm from OMI LER climatology
surface_altitude | double | {time} | [m] | surface altitude extracted from GTOPO30
pressure_bounds | double | {time, vertical, 2} | [Pa] | pressure at the boundaries of the layers used in the forward model
O3_column_number_density_avk | double | {time, vertical} | [] | averaging kernels in the layers of the forward model
O3_column_number_density_apriori | double | {time, vertical} | [DU] | a-priori partial ozone columns in the layers of the forward model
index | int32 | {time} |  | zero-based index of the sample within the source product

## Mapping description

The table below details where and how each variable was retrieved from the input product.

field name | mapping description
--- | ---
scan_subindex | path | /pixel_number[]
datetime | path | /time[]
longitude | path | /longitude[]
latitude | path | /latitude[]
longitude_bounds | path | /longitude_corner[]
latitude_bounds | path | /latitude_corner[]
sensor_zenith_angle | path | /viewing_zenith_angle[]
solar_zenith_angle | path | /solar_zenith_angle[]
relative_azimuth_angle | path | /relative_azimuth_angle[]
O3_column_number_density | path | /total_ozone_column[]
O3_column_number_density_uncertainty_random | path | /total_ozone_column_random_error[]
temperature | path | /effective_temperature[]
cloud_fraction | path | /cloud_fraction[]
cloud_top_pressure | path | /cloud_top_pressure[]
cloud_top_albedo | path | /cloud_albedo[]
scene_pressure | path | /effective_scene_pressure[]
scene_albedo | path | /effective_scene_albedo[]
surface_albedo | path | /surface_albedo[]
surface_altitude | path | /surface_altitude[]
pressure_bounds | path | /atmosphere_pressure_grid
description | converted from pressure levels given at the boundaries between adjacent layers to a pair of pressures per layer (each pair consists of the pressure at the lower and at the upper boundary of a layer)
O3_column_number_density_avk | path | /averaging_kernels[]
O3_column_number_density_apriori | path | /apriori_ozone_profile[]