SCIAMACHY_L2_NADIR_IR0_H2O

Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of SCIAMACHY_L2_NADIR_IR0_H2O 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)
H2O_column_number_density	double	{time}	[molec/cm^2]	H2O vertical column density
H2O_column_number_density_uncertainty	double	{time}	[molec/cm^2]	error on the H2O vertical column density
H2O_column_number_density_validity	int32	{time}		flag describing the H2O vertical column density
cloud_fraction	double	{time}	[]	average cloud fraction of footprint
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_ir0_h2o

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_ir0_h2o[]/dsr_time
datetime_length	path	/nad_ir0_h2o[]/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)
H2O_column_number_density	path	/nad_ir0_h2o[]/vcd[0]
H2O_column_number_density_uncertainty	path	/nad_ir0_h2o[]/vcd_err[0], /nad_ir0_h2o[]/vcd[0]
	description	relative error is converted to absolute error by multiplying with measured value
H2O_column_number_density_validity	path	/nad_ir0_h2o[]/flag_vcd_flags
cloud_fraction	path	/clouds_aerosol[]/cl_frac
	description	in case of co-adding, the average of all values within the integration time is taken