SCIAMACHY_L2_NADIR_IR3_CO

Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of SCIAMACHY_L2_NADIR_IR3_CO data.

field name type dimensions unit description
datetime_start double {time} [seconds since 2000-01-01] measurement start time
datetime_length double {time} [s] measurement integration time
orbit_index int32     absolute orbit number
latitude double {time} [degree_north] center latitude for each nadir pixel
longitude double {time} [degree_east] center longitude for each nadir pixel
latitude_bounds double {time, 4} [degree_north] corner latitudes for each nadir pixel
longitude_bounds double {time, 4} [degree_east] corner longitudes for each nadir pixel
solar_zenith_angle double {time} [degree] solar zenith angle at top of atmosphere
viewing_zenith_angle double {time} [degree] line of sight zenith angle at top of atmosphere
relative_azimuth_angle double {time} [degree] relative azimuth angle at top of atmosphere
scan_direction_type int8 {time}   scan direction for each measurement; enumeration values: forward (0), backward (1), mixed (2)
cloud_fraction double {time} [] average cloud fraction of footprint
CO_column_number_density double {time} [molec/cm^2] CO vertical column density
CO_column_number_density_uncertainty double {time} [molec/cm^2] error on the CO vertical column density
CO_column_number_density_validity int32 {time}   flag describing the CO vertical column density
index int32 {time}   zero-based index of the sample within the source product

Ingestion options

The table below lists the available ingestion options for SCIAMACHY_L2 products.

option name legal values description
dataset nad_uv0_o3, nad_uv1_no2, nad_uv3_bro, nad_uv4_h2co, nad_uv5_so2, nad_uv6_oclo, nad_uv7_so2, nad_uv8_h2o, nad_uv9_chocho, nad_ir0_h2o, nad_ir1_ch4, nad_ir2_n2o, nad_ir3_co, nad_ir4_co2, lim_uv0_o3, lim_uv1_no2, lim_uv3_bro, clouds_aerosol the dataset of the L2 product to ingest; each dataset is a combination of nadir/limb choice, retrieval window, and main quantity; option values are ‘nad_uv0_o3’ (default), ‘nad_uv1_no2’, ‘nad_uv3_bro’, ‘nad_uv4_h2co’, ‘nad_uv5_so2’, ‘nad_uv6_oclo’, ‘nad_uv7_so2’, ‘nad_uv8_h2o’, ‘nad_uv9_chocho’, ‘nad_ir0_h2o’, ‘nad_ir1_ch4’, ‘nad_ir2_n2o’, ‘nad_ir3_co’, ‘nad_ir4_co2’, ‘lim_uv0_o3’, ‘lim_uv1_no2’, ‘lim_uv3_bro’, ‘clouds_aerosol’

This definition is only applicable when: dataset=nad_ir3_co

Mapping description

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

field name mapping description
datetime_start path /nad_ir3_co[]/dsr_time
datetime_length path /nad_ir3_co[]/integr_time
orbit_index path /mph/abs_orbit
latitude condition No co-adding needed
path /geolocation_nadir[]/cen_coor_nad/latitude
description center latitude for each nadir pixel
condition Co-adding needed and all N geolocations are within a single scan (N is not divisible by 5)
path /geolocation_nadir[]/cor_coor_nad[]
description the latitude of the geographic average of cor_coor_nad[2] and cor_coor_nad[3] of the N/2-th pixel
condition Co-adding needed of both forward and backward scan pixels (N is divisible by 5)
path /geolocation_nadir[]/cen_coor_nad, /geolocation_nadir[]/cor_coor_nad[]
description the latitude of the geographic average of 1: the geographic average of cor_coor_nad[2] and cor_coor_nad[3] of the second pixel and 2: cen_coor_nad of the N-th pixel
longitude condition No co-adding needed
path /geolocation_nadir[]/cen_coor_nad/longitude
description center longitude for each nadir pixel
condition Co-adding needed and all N geolocations are within a single scan (N is not divisible by 5)
path /geolocation_nadir[]/cor_coor_nad[]
description the longitude of the geographic average of cor_coor_nad[2] and cor_coor_nad[3] of the N/2-th pixel
condition Co-adding needed of both forward and backward scan pixels (N is divisible by 5)
path /geolocation_nadir[]/cen_coor_nad, /geolocation_nadir[]/cor_coor_nad[]
description the longitude of the geographic average of 1: the geographic average of cor_coor_nad[2] and cor_coor_nad[3] of the second pixel and 2: cen_coor_nad of the N-th pixel
latitude_bounds condition No co-adding needed
path /geolocation_nadir[]/cor_coor_nad[]/latitude
description corners are rearranged in the following way: 0,2,3,1
condition Co-adding needed and all N geolocations are within a single scan (N is not divisible by 5)
path /geolocation_nadir[]/cor_coor_nad[]
description cor_coor_nad[0] and cor_coor_nad[1] are taken from the first pixel and cor_coor_nad[2] and cor_coor_nad[3] are taken from the N-th pixel; corners are rearranged in the following way: 0,2,3,1
condition Co-adding needed of both forward and backward scan pixels (N is divisible by 5)
path /geolocation_nadir[]/cor_coor_nad[]
description cor_coor_nad[0] is taken from the first pixel, cor_coor_nad[2] is taken from the fourth pixel, cor_coor_nad[1] is taken from cor_coor_nad[3] of the N-th pixel, and cor_coor_nad[3] is taken from cor_coor_nad[1] from the N-th pixel; corners are rearranged in the following way: 0,2,3,1
longitude_bounds condition No co-adding needed
path /geolocation_nadir[]/cor_coor_nad[]/longitude
description corners are rearranged in the following way: 0,2,3,1
condition Co-adding needed and all N geolocations are within a single scan (N is not divisible by 5)
path /geolocation_nadir[]/cor_coor_nad[]
description cor_coor_nad[0] and cor_coor_nad[1] are taken from the first pixel and cor_coor_nad[2] and cor_coor_nad[3] are taken from the N-th pixel; corners are rearranged in the following way: 0,2,3,1
condition Co-adding needed of both forward and backward scan pixels (N is divisible by 5)
path /geolocation_nadir[]/cor_coor_nad[]
description cor_coor_nad[0] is taken from the first pixel, cor_coor_nad[2] is taken from the fourth pixel, cor_coor_nad[1] is taken from cor_coor_nad[3] of the N-th pixel, and cor_coor_nad[3] is taken from cor_coor_nad[1] from the N-th pixel; corners are rearranged in the following way: 0,2,3,1
solar_zenith_angle condition No co-adding needed
path /geolocation_nadir[]/sol_zen_angle_toa[1]
condition Co-adding needed and all N geolocations are within a single scan (N is not divisible by 5)
path /geolocation_nadir[]/sol_zen_angle_toa[2]
description the value at end of integration time of the N/2-th geolocation
condition Co-adding needed of both forward and backward scan pixels (N is divisible by 5)
path /geolocation_nadir[]/sol_zen_angle_toa[1], /geolocation_nadir[]/sol_zen_angle_toa[2]
description the average of the value at end of integration time of the second record and the value at middle of integration time of the N-th record
viewing_zenith_angle condition No co-adding needed
path /geolocation_nadir[]/los_zen_angle_toa[1]
condition Co-adding needed and all N geolocations are within a single scan (N is not divisible by 5)
path /geolocation_nadir[]/los_zen_angle_toa[2]
description the value at end of integration time of the N/2-th geolocation
condition Co-adding needed of both forward and backward scan pixels (N is divisible by 5)
path /geolocation_nadir[]/los_zen_angle_toa[1], /geolocation_nadir[]/los_zen_angle_toa[2]
description the average of the value at end of integration time of the second record and the value at middle of integration time of the N-th record
relative_azimuth_angle condition No co-adding needed
path /geolocation_nadir[]/rel_azi_angle_toa[1]
condition Co-adding needed and all N geolocations are within a single scan (N is not divisible by 5)
path /geolocation_nadir[]/rel_azi_angle_toa[2]
description the value at end of integration time of the N/2-th geolocation
condition Co-adding needed of both forward and backward scan pixels (N is divisible by 5)
path /geolocation_nadir[]/rel_azi_angle_toa[1], /geolocation_nadir[]/rel_azi_angle_toa[2]
description the average of the value at end of integration time of the second record and the value at middle of integration time of the N-th record
scan_direction_type path /geolocation_nadir[]/corner_coord[], /geolocation_nadir[]/dsr_time
description When the integration time is higher than 1s we are dealing with a mixed (2) pixel, otherwise the scan direction is based on the corner coordinates of the first ground pixel of the measurement. The first geolocation pixel is a backscan (1) pixel if the inproduct of the unit vector of the third corner with the outproduct of the unit vector of the first corner and the unit vector of the second corner is negative (otherwise it is part of a forward (0) scan)
cloud_fraction path /clouds_aerosol[]/cl_frac
CO_column_number_density path /nad_ir3_co[]/vcd[0]
CO_column_number_density_uncertainty path /nad_ir3_co[]/vcd_err[0], /nad_ir3_co[]/vcd[0]
description relative error is converted to absolute error by multiplying with measured value
CO_column_number_density_validity path /nad_ir3_co[]/flag_vcd_flags