ECA_ATL_ALD_2A
Variables
The table below lists the variables that are present in the HARP product that results from an ingestion of ECA_ATL_ALD_2A data.
| field name | type | dimensions | unit | description | 
|---|---|---|---|---|
| datetime | double | {time} | [seconds since 2000-01-01] | UTC time | 
| latitude | double | {time} | [degree_north] | Geodetic latitude | 
| longitude | double | {time} | [degree_east] | Geodetic longitude | 
| orbit_index | int32 | absolute orbit number | ||
| altitude_bounds | float | {time, vertical, 2} | [m] | aerosol layer base and top | 
| aerosol_optical_depth | float | {time, vertical} | [] | aerosol layer optical thickness 355nm | 
| aerosol_optical_depth_uncertainty | float | {time, vertical} | [] | aerosol layer optical thickness 355nm error | 
| aerosol_extinction_coefficient | float | {time, vertical} | [1/m] | aerosol layer mean extinction 355nm | 
| aerosol_extinction_coefficient_uncertainty | float | {time, vertical} | [1/m] | aerosol layer mean extinction 355nm error | 
| aerosol_backscatter_coefficient | float | {time, vertical} | [1/m/sr] | aerosol layer mean backscatter 355nm | 
| aerosol_backscatter_coefficient_uncertainty | float | {time, vertical} | [1/m/sr] | aerosol layer mean backscatter 355nm error | 
| lidar_ratio | float | {time, vertical} | [sr] | aerosol layer mean lidar ratio 355nm | 
| lidar_ratio_uncertainty | float | {time, vertical} | [sr] | aerosol layer mean lidar ratio 355nm error | 
| linear_depolarization_ratio | float | {time, vertical} | [] | aerosol layer mean depolarization ratio 355nm | 
| linear_depolarization_ratio_uncertainty | float | {time, vertical} | [] | aerosol layer mean depolarization ratio 355nm error | 
| validity | int8 | {time} | quality status | |
| wavelength | float | [nm] | lidar wavelength | |
| 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 | |
|---|---|---|
| datetime | path | /ScienceData/time | 
| latitude | path | /ScienceData/latitude | 
| longitude | path | /ScienceData/longitude | 
| orbit_index | path | /HeaderData/VariableProductHeader/MainProductHeader/orbitNumber | 
| altitude_bounds | path | /ScienceData/aerosol_layer_base, /ScienceData/aerosol_layer_top, /ScienceData/geoid_offset | 
| description | the vertical grid is inverted to make it ascending; altitude_bounds[i,j,0] = aerosol_layer_base[i,j] - geoid_offset[i]; altitude_bounds[i,j,1] = aerosol_layer_top[i,j] - geoid_offset[i] | |
| aerosol_optical_depth | path | /ScienceData/aerosol_layer_optical_thickness_355nm | 
| description | the vertical grid is inverted to make it ascending | |
| aerosol_optical_depth_uncertainty | path | /ScienceData/aerosol_layer_optical_thickness_355nm_error | 
| description | the vertical grid is inverted to make it ascending | |
| aerosol_extinction_coefficient | path | /ScienceData/aerosol_layer_mean_extinction_355nm | 
| description | the vertical grid is inverted to make it ascending | |
| aerosol_extinction_coefficient_uncertainty | path | /ScienceData/aerosol_layer_mean_extinction_355nm_error | 
| description | the vertical grid is inverted to make it ascending | |
| aerosol_backscatter_coefficient | path | /ScienceData/aerosol_layer_mean_backscatter_355nm | 
| description | the vertical grid is inverted to make it ascending | |
| aerosol_backscatter_coefficient_uncertainty | path | /ScienceData/aerosol_layer_mean_backscatter_355nm_error | 
| description | the vertical grid is inverted to make it ascending | |
| lidar_ratio | path | /ScienceData/aerosol_layer_mean_lidar_ratio_355nm | 
| description | the vertical grid is inverted to make it ascending | |
| lidar_ratio_uncertainty | path | /ScienceData/aerosol_layer_mean_lidar_ratio_355nm_error | 
| description | the vertical grid is inverted to make it ascending | |
| linear_depolarization_ratio | path | /ScienceData/aerosol_layer_mean_depolarisation_355nm | 
| description | the vertical grid is inverted to make it ascending | |
| linear_depolarization_ratio_uncertainty | path | /ScienceData/aerosol_layer_mean_depolarisation_355nm_error | 
| description | the vertical grid is inverted to make it ascending | |
| validity | path | /ScienceData/quality_status | 
| wavelength | description | set to fixed value of 355nm |