HDF4 file: 1600 data descriptors
library version = "HDF Version 4.2 Release 5, February 17, 2010"
vgroup "/bira-iasb/projects/FTIR/retrievals/working/ftir_op/sfit4/xianghe/bruker125HR/H2CO/v1.1/geoms/groundbased_ftir.h2co_cas.iap001_xianghe_20260810t020536z_20260814t081437z_001.hdf" class "CDF0.0"
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	vgroup "fakeDim69" class "Dim0.0"
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	vgroup "DATETIME" class "Var0.0"
		attribute VAR_DATA_TYPE = "DOUBLE"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "Mean of the zero path difference times of the individual scans that were averaged to produce the fitted spectrum"
		attribute VAR_FILL_VALUE = -99999999.0
		attribute VAR_NAME = "DATETIME"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;86400.0;s"
		attribute VAR_UNITS = "MJD2K"
		attribute VAR_VALID_MAX = 9722.343486145834
		attribute VAR_VALID_MIN = 9718.087223715278
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "INTEGRATION.TIME" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "duration of the measurement of the interferogram (and thus spectrum) from which the profile has been retrieved"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "INTEGRATION.TIME"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;1.0;s"
		attribute VAR_UNITS = "s"
		attribute VAR_VALID_MAX = 3600.0
		attribute VAR_VALID_MIN = 0.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "LATITUDE.INSTRUMENT" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "CONSTANT"
		attribute VAR_DESCRIPTION = "Latitude north (decimal degrees) of the location of the instrument"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "LATITUDE.INSTRUMENT"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "1"
		attribute VAR_SI_CONVERSION = "0.0;1.74533E-2;rad"
		attribute VAR_UNITS = "deg"
		attribute VAR_VALID_MAX = 90.0
		attribute VAR_VALID_MIN = -90.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "LONGITUDE.INSTRUMENT" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "CONSTANT"
		attribute VAR_DESCRIPTION = "Longitude east (decimal degrees) of the location of the instrument"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "LONGITUDE.INSTRUMENT"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "1"
		attribute VAR_SI_CONVERSION = "0.0;1.74533E-2;rad"
		attribute VAR_UNITS = "deg"
		attribute VAR_VALID_MAX = 180.0
		attribute VAR_VALID_MIN = -180.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "ALTITUDE.INSTRUMENT" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "CONSTANT"
		attribute VAR_DESCRIPTION = "Altitude of the location of the instrument"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "ALTITUDE.INSTRUMENT"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "1"
		attribute VAR_SI_CONVERSION = "0.0;1.0;m"
		attribute VAR_UNITS = "m"
		attribute VAR_VALID_MAX = 46.0
		attribute VAR_VALID_MIN = 46.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "SURFACE.PRESSURE_INDEPENDENT" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "Surface/ground pressure"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "SURFACE.PRESSURE_INDEPENDENT"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;1.0E2;kg m-1 s-2"
		attribute VAR_UNITS = "hPa"
		attribute VAR_VALID_MAX = 1100.0
		attribute VAR_VALID_MIN = 500.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "SURFACE.PRESSURE_INDEPENDENT_SOURCE" class "Var0.0"
		attribute VAR_DATA_TYPE = "STRING"
		attribute VAR_DEPEND = "CONSTANT"
		attribute VAR_DESCRIPTION = "Surface/ground pressure profile source (e.g.  Mercury barometer etc.)"
		attribute VAR_FILL_VALUE = ""
		attribute VAR_NAME = "SURFACE.PRESSURE_INDEPENDENT_SOURCE"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "1"
		attribute VAR_SI_CONVERSION = ""
		attribute VAR_UNITS = ""
		attribute VAR_VALID_MAX = ""
		attribute VAR_VALID_MIN = ""
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "SURFACE.TEMPERATURE_INDEPENDENT" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "Surface/ground temperature"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "SURFACE.TEMPERATURE_INDEPENDENT"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;1.0;K"
		attribute VAR_UNITS = "K"
		attribute VAR_VALID_MAX = 320.0
		attribute VAR_VALID_MIN = 220.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "SURFACE.TEMPERATURE_INDEPENDENT_SOURCE" class "Var0.0"
		attribute VAR_DATA_TYPE = "STRING"
		attribute VAR_DEPEND = "CONSTANT"
		attribute VAR_DESCRIPTION = "Surface temperature profile source (e.g.  Meteorological thermometer etc.)"
		attribute VAR_FILL_VALUE = ""
		attribute VAR_NAME = "SURFACE.TEMPERATURE_INDEPENDENT_SOURCE"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "1"
		attribute VAR_SI_CONVERSION = ""
		attribute VAR_UNITS = ""
		attribute VAR_VALID_MAX = ""
		attribute VAR_VALID_MIN = ""
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "HUMIDITY.RELATIVE.SURFACE_INDEPENDENT" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "Relative humidity at the station"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "HUMIDITY.RELATIVE.SURFACE_INDEPENDENT"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;0.01;1"
		attribute VAR_UNITS = "%"
		attribute VAR_VALID_MAX = 150.0
		attribute VAR_VALID_MIN = 0.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "HUMIDITY.RELATIVE.SURFACE_INDEPENDENT_SOURCE" class "Var0.0"
		attribute VAR_DATA_TYPE = "STRING"
		attribute VAR_DEPEND = "CONSTANT"
		attribute VAR_DESCRIPTION = "Relative humidity source (e.g. Anemometer; ECMWF etc.)"
		attribute VAR_FILL_VALUE = ""
		attribute VAR_NAME = "HUMIDITY.RELATIVE.SURFACE_INDEPENDENT_SOURCE"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "1"
		attribute VAR_SI_CONVERSION = ""
		attribute VAR_UNITS = ""
		attribute VAR_VALID_MAX = ""
		attribute VAR_VALID_MIN = ""
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "WIND.DIRECTION.SURFACE_INDEPENDENT" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "Wind direction at the station using WMO definition (wind from the north is 360; from the east is 90 and so on. No wind (calm) is 0)"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "WIND.DIRECTION.SURFACE_INDEPENDENT"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;1.74533E-2;rad"
		attribute VAR_UNITS = "deg"
		attribute VAR_VALID_MAX = 360.0
		attribute VAR_VALID_MIN = 0.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "WIND.DIRECTION.SURFACE_INDEPENDENT_SOURCE" class "Var0.0"
		attribute VAR_DATA_TYPE = "STRING"
		attribute VAR_DEPEND = "CONSTANT"
		attribute VAR_DESCRIPTION = "Wind direction source (e.g. Anemometer; ECMWF etc.)"
		attribute VAR_FILL_VALUE = ""
		attribute VAR_NAME = "WIND.DIRECTION.SURFACE_INDEPENDENT_SOURCE"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "1"
		attribute VAR_SI_CONVERSION = ""
		attribute VAR_UNITS = ""
		attribute VAR_VALID_MAX = ""
		attribute VAR_VALID_MIN = ""
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "WIND.SPEED.SURFACE_INDEPENDENT" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "Wind speed at the station"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "WIND.SPEED.SURFACE_INDEPENDENT"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;1.0;m s-1"
		attribute VAR_UNITS = "m s-1"
		attribute VAR_VALID_MAX = 300.0
		attribute VAR_VALID_MIN = 0.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "WIND.SPEED.SURFACE_INDEPENDENT_SOURCE" class "Var0.0"
		attribute VAR_DATA_TYPE = "STRING"
		attribute VAR_DEPEND = "CONSTANT"
		attribute VAR_DESCRIPTION = "Wind speed source (e.g. Anemometer; ECMWF etc.)"
		attribute VAR_FILL_VALUE = ""
		attribute VAR_NAME = "WIND.SPEED.SURFACE_INDEPENDENT_SOURCE"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "1"
		attribute VAR_SI_CONVERSION = ""
		attribute VAR_UNITS = ""
		attribute VAR_VALID_MAX = ""
		attribute VAR_VALID_MIN = ""
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "ALTITUDE" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "ALTITUDE"
		attribute VAR_DESCRIPTION = "Grid of altitude levels upon which the retrieved target vmr profile as well as pressure and temperature profiles are reported"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "ALTITUDE"
		attribute VAR_NOTES = "These altitudes are the centers of the retrieval altitude layers (geometric mean between the 2 layer boundaries); the reported vmr, P and T are effective layer values."
		attribute VAR_SIZE = "47"
		attribute VAR_SI_CONVERSION = "0.0;1.0E3;m"
		attribute VAR_UNITS = "km"
		attribute VAR_VALID_MAX = 120.0
		attribute VAR_VALID_MIN = -0.0500000007
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "ALTITUDE.BOUNDARIES" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "ALTITUDE;INDEPENDENT"
		attribute VAR_DESCRIPTION = "2D matrix providing the layer boundaries used for vertical profile retrieval"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "ALTITUDE.BOUNDARIES"
		attribute VAR_NOTES = "The retrieved partial columns are given between the boundaries provided in this vector. The lowermost boundary is equal to ALTITUDE.INSTRUMENT"
		attribute VAR_SIZE = "47;2"
		attribute VAR_SI_CONVERSION = "0.0;1.0E3;m"
		attribute VAR_UNITS = "km"
		attribute VAR_VALID_MAX = 125.0
		attribute VAR_VALID_MIN = -0.0500000007
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "PRESSURE_INDEPENDENT" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE"
		attribute VAR_DESCRIPTION = "Total effective air pressures in layers for vertical profile retrieval"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "PRESSURE_INDEPENDENT"
		attribute VAR_NOTES = "Used as apriori input; The pressure values represent the effective pressure in each layer and are reported at the center altitude of each layer"
		attribute VAR_SIZE = "15;47"
		attribute VAR_SI_CONVERSION = "0.0;1.0E2;kg m-1 s-2"
		attribute VAR_UNITS = "hPa"
		attribute VAR_VALID_MAX = 1100.0
		attribute VAR_VALID_MIN = 0.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "PRESSURE_INDEPENDENT_SOURCE" class "Var0.0"
		attribute VAR_DATA_TYPE = "STRING"
		attribute VAR_DEPEND = "CONSTANT"
		attribute VAR_DESCRIPTION = "Origin of pressure profile"
		attribute VAR_FILL_VALUE = ""
		attribute VAR_NAME = "PRESSURE_INDEPENDENT_SOURCE"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "1"
		attribute VAR_SI_CONVERSION = ""
		attribute VAR_UNITS = ""
		attribute VAR_VALID_MAX = ""
		attribute VAR_VALID_MIN = ""
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "TEMPERATURE_INDEPENDENT" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE"
		attribute VAR_DESCRIPTION = "effective air temperatures in layers for vertical profile retrieval"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "TEMPERATURE_INDEPENDENT"
		attribute VAR_NOTES = "Used as apriori input for SFIT4; The temperature values represent the effective temperatures in each layer and are reported at the center altitude of each layer"
		attribute VAR_SIZE = "15;47"
		attribute VAR_SI_CONVERSION = "0.0;1.0;K"
		attribute VAR_UNITS = "K"
		attribute VAR_VALID_MAX = 500.0
		attribute VAR_VALID_MIN = 0.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "TEMPERATURE_INDEPENDENT_SOURCE" class "Var0.0"
		attribute VAR_DATA_TYPE = "STRING"
		attribute VAR_DEPEND = "CONSTANT"
		attribute VAR_DESCRIPTION = "Origin of temperature profile"
		attribute VAR_FILL_VALUE = ""
		attribute VAR_NAME = "TEMPERATURE_INDEPENDENT_SOURCE"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "1"
		attribute VAR_SI_CONVERSION = ""
		attribute VAR_UNITS = ""
		attribute VAR_VALID_MAX = ""
		attribute VAR_VALID_MIN = ""
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "DRY.AIR.COLUMN.PARTIAL_INDEPENDENT" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE"
		attribute VAR_DESCRIPTION = "Partial column of dry air"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "DRY.AIR.COLUMN.PARTIAL_INDEPENDENT"
		attribute VAR_NOTES = "Derived from the apriori input with the raytrace subroutine in sfit4"
		attribute VAR_SIZE = "15;47"
		attribute VAR_SI_CONVERSION = "0.0;1.66054E1;mol m-2"
		attribute VAR_UNITS = "Zmolec cm-2"
		attribute VAR_VALID_MAX = 5000.0
		attribute VAR_VALID_MIN = 0.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "DRY.AIR.COLUMN.PARTIAL_INDEPENDENT_SOURCE" class "Var0.0"
		attribute VAR_DATA_TYPE = "STRING"
		attribute VAR_DEPEND = "CONSTANT"
		attribute VAR_DESCRIPTION = "Origin of pressure profile"
		attribute VAR_FILL_VALUE = ""
		attribute VAR_NAME = "DRY.AIR.COLUMN.PARTIAL_INDEPENDENT_SOURCE"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "1"
		attribute VAR_SI_CONVERSION = ""
		attribute VAR_UNITS = ""
		attribute VAR_VALID_MAX = ""
		attribute VAR_VALID_MIN = ""
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2CO.MIXING.RATIO.VOLUME.DRY_ABSORPTION.SOLAR" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE"
		attribute VAR_DESCRIPTION = "Retrieved target vertical  profile in VMR units (with respect to dry air)"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2CO.MIXING.RATIO.VOLUME.DRY_ABSORPTION.SOLAR"
		attribute VAR_NOTES = "retrieved from (cm-1): [2763.42,2764.17],[2765.65,2766.01],[2778.15,2779.1],[2780.65,2782.0]"
		attribute VAR_SIZE = "15;47"
		attribute VAR_SI_CONVERSION = "0.0;1.0E-6;1"
		attribute VAR_UNITS = "ppmv"
		attribute VAR_VALID_MAX = 0.00609710021
		attribute VAR_VALID_MIN = 4.10060011e-06
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2CO.MIXING.RATIO.VOLUME.DRY_APRIORI" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE"
		attribute VAR_DESCRIPTION = "A-priori target vertical profile in VMR units (with respect to dry air)"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2CO.MIXING.RATIO.VOLUME.DRY_APRIORI"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "15;47"
		attribute VAR_SI_CONVERSION = "0.0;1.0E-6;1"
		attribute VAR_UNITS = "ppmv"
		attribute VAR_VALID_MAX = 0.00208649994
		attribute VAR_VALID_MIN = 1.5219e-06
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2CO.MIXING.RATIO.VOLUME.DRY_APRIORI.SOURCE" class "Var0.0"
		attribute VAR_DATA_TYPE = "STRING"
		attribute VAR_DEPEND = "CONSTANT"
		attribute VAR_DESCRIPTION = "Source of the vertical profile of a-priori per layer"
		attribute VAR_FILL_VALUE = ""
		attribute VAR_NAME = "H2CO.MIXING.RATIO.VOLUME.DRY_APRIORI.SOURCE"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "1"
		attribute VAR_SI_CONVERSION = ""
		attribute VAR_UNITS = ""
		attribute VAR_VALID_MAX = ""
		attribute VAR_VALID_MIN = ""
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2CO.MIXING.RATIO.VOLUME.DRY_ABSORPTION.SOLAR_AVK" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE;ALTITUDE"
		attribute VAR_DESCRIPTION = "averaging kernel matrix (AVK) of the retrieved vertical H2CO profile, in VMR/VMR units"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2CO.MIXING.RATIO.VOLUME.DRY_ABSORPTION.SOLAR_AVK"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "15;47;47"
		attribute VAR_SI_CONVERSION = "0.0;1.0;1"
		attribute VAR_UNITS = "1"
		attribute VAR_VALID_MAX = 0.322902977
		attribute VAR_VALID_MIN = -0.000466017489
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2CO.MIXING.RATIO.VOLUME.DRY_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM.COVARIANCE" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE;ALTITUDE"
		attribute VAR_DESCRIPTION = "total random error covariance matrix associated with the retrieved H2CO vertical profiles, in VMR units"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2CO.MIXING.RATIO.VOLUME.DRY_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM.COVARIANCE"
		attribute VAR_NOTES = "contributions (no smoothing!): measurement;retrieval_params;interfering_specs;temperature;sza;curvature;omega;zshift"
		attribute VAR_SIZE = "15;47;47"
		attribute VAR_SI_CONVERSION = "0.0;1.0E-12;1"
		attribute VAR_UNITS = "ppmv2"
		attribute VAR_VALID_MAX = 9.22027876e-09
		attribute VAR_VALID_MIN = -1.15952792e-09
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2CO.MIXING.RATIO.VOLUME.DRY_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC.COVARIANCE" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE;ALTITUDE"
		attribute VAR_DESCRIPTION = "total systematic error covariance matrix associated with the retrieved H2CO vertical profiles, in VMR units"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2CO.MIXING.RATIO.VOLUME.DRY_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC.COVARIANCE"
		attribute VAR_NOTES = "contributions (no smoothing!): retrieval_params;interfering_specs;temperature;sza;lineint;linetair;linepair;curvature;omega;zshift"
		attribute VAR_SIZE = "15;47;47"
		attribute VAR_SI_CONVERSION = "0.0;1.0E-12;1"
		attribute VAR_UNITS = "ppmv2"
		attribute VAR_VALID_MAX = 5.81291147e-07
		attribute VAR_VALID_MIN = 4.27011182e-13
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2CO.COLUMN.PARTIAL_ABSORPTION.SOLAR" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE"
		attribute VAR_DESCRIPTION = "H2CO partial columns in the retrieval layers"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2CO.COLUMN.PARTIAL_ABSORPTION.SOLAR"
		attribute VAR_NOTES = "partial column evaluations use a priori pressure and temperature"
		attribute VAR_SIZE = "15;47"
		attribute VAR_SI_CONVERSION = "0.0;1.66054E-5;mol m-2"
		attribute VAR_UNITS = "Pmolec cm-2"
		attribute VAR_VALID_MAX = 5.49427986
		attribute VAR_VALID_MIN = 4.02178664e-08
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2CO.COLUMN.PARTIAL_APRIORI" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE"
		attribute VAR_DESCRIPTION = "H2CO a priori partial columns in the retrieval layers"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2CO.COLUMN.PARTIAL_APRIORI"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "15;47"
		attribute VAR_SI_CONVERSION = "0.0;1.66054E-5;mol m-2"
		attribute VAR_UNITS = "Pmolec cm-2"
		attribute VAR_VALID_MAX = 1.88872063
		attribute VAR_VALID_MIN = 1.49264903e-08
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2CO.COLUMN_ABSORPTION.SOLAR" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "Total vertical column of target gas"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2CO.COLUMN_ABSORPTION.SOLAR"
		attribute VAR_NOTES = "retrieved from (cm-1): [2763.42,2764.17],[2765.65,2766.01],[2778.15,2779.1],[2780.65,2782.0]"
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;1.66054E-5;mol m-2"
		attribute VAR_UNITS = "Pmolec cm-2"
		attribute VAR_VALID_MAX = 26.705183
		attribute VAR_VALID_MIN = 19.4865036
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2CO.COLUMN_APRIORI" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "a priori total vertical H2CO column between boundaries of altitude grid"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2CO.COLUMN_APRIORI"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;1.66054E-5;mol m-2"
		attribute VAR_UNITS = "Pmolec cm-2"
		attribute VAR_VALID_MAX = 9.07918835
		attribute VAR_VALID_MIN = 8.9906168
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2CO.COLUMN_ABSORPTION.SOLAR_AVK" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE"
		attribute VAR_DESCRIPTION = "total vertical column averaging kernel for H2CO derived from mixing ratio averaging kernel"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2CO.COLUMN_ABSORPTION.SOLAR_AVK"
		attribute VAR_NOTES = " this averaging kernel multiplies the partial column vector in order to get smoothed total column"
		attribute VAR_SIZE = "15;47"
		attribute VAR_SI_CONVERSION = "0.0;1.0;1"
		attribute VAR_UNITS = "1"
		attribute VAR_VALID_MAX = 2.91863108
		attribute VAR_VALID_MIN = 0.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2CO.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM.STANDARD" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "total random uncertainty on the retrieved total vertical H2CO columns"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2CO.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM.STANDARD"
		attribute VAR_NOTES = "contributions (no smoothing!): measurement;retrieval_params;interfering_specs;temperature;sza;curvature;omega;zshift"
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;1.66054E-5;mol m-2"
		attribute VAR_UNITS = "Pmolec cm-2"
		attribute VAR_VALID_MAX = 0.346996874
		attribute VAR_VALID_MIN = 0.289535969
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2CO.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC.STANDARD" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "total systematic uncertainty on the retrieved total vertical H2CO columns"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2CO.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC.STANDARD"
		attribute VAR_NOTES = "contributions (no smoothing!): retrieval_params;interfering_specs;temperature;sza;lineint;linetair;linepair;curvature;omega;zshift"
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;1.66054E-5;mol m-2"
		attribute VAR_UNITS = "Pmolec cm-2"
		attribute VAR_VALID_MAX = 3.4072473
		attribute VAR_VALID_MIN = 2.4764204
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "ANGLE.SOLAR_ZENITH.ASTRONOMICAL" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "astronomical zenith angle of the sun"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "ANGLE.SOLAR_ZENITH.ASTRONOMICAL"
		attribute VAR_NOTES = "calculated with function get_altitude(...,pressure=0) [pysolar 0.7]"
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;1.74533E-2;rad"
		attribute VAR_UNITS = "deg"
		attribute VAR_VALID_MAX = 95.0
		attribute VAR_VALID_MIN = 0.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "ANGLE.SOLAR_AZIMUTH" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "azimuth angle of the sun (O at North, pos. to East, neg. to West)"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "ANGLE.SOLAR_AZIMUTH"
		attribute VAR_NOTES = "calculated with function get_azimuth(...) [pysolar 0.7]"
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;1.74533E-2;rad"
		attribute VAR_UNITS = "deg"
		attribute VAR_VALID_MAX = 360.0
		attribute VAR_VALID_MIN = 0.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "LATITUDE_LOS" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE"
		attribute VAR_DESCRIPTION = "Latitude of the line of sight determined from solar position to solar tracker reported on altitude grid"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "LATITUDE_LOS"
		attribute VAR_NOTES = "Derived from the raytrace submodule in sfit4"
		attribute VAR_SIZE = "15;47"
		attribute VAR_SI_CONVERSION = "0.0;1.74533E-2;rad"
		attribute VAR_UNITS = "deg"
		attribute VAR_VALID_MAX = 90.0
		attribute VAR_VALID_MIN = -90.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "LONGITUDE_LOS" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE"
		attribute VAR_DESCRIPTION = "Longitude of the line of sight determined from solar position to solar tracker reported on altitude grid"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "LONGITUDE_LOS"
		attribute VAR_NOTES = "Derived from the raytrace submodule in sfit4"
		attribute VAR_SIZE = "15;47"
		attribute VAR_SI_CONVERSION = "0.0;1.74533E-2;rad"
		attribute VAR_UNITS = "deg"
		attribute VAR_VALID_MAX = 180.0
		attribute VAR_VALID_MIN = -180.0
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2O.MIXING.RATIO.VOLUME.DRY_APRIORI" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME;ALTITUDE"
		attribute VAR_DESCRIPTION = "Vertical profile of H2O adopted in the target gas retrieval in VMR units"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2O.MIXING.RATIO.VOLUME.DRY_APRIORI"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "15;47"
		attribute VAR_SI_CONVERSION = "0.0;1.0E-6;1"
		attribute VAR_UNITS = "ppmv"
		attribute VAR_VALID_MAX = 21549.0
		attribute VAR_VALID_MIN = 0.226260006
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2O.MIXING.RATIO.VOLUME.DRY_APRIORI.SOURCE" class "Var0.0"
		attribute VAR_DATA_TYPE = "STRING"
		attribute VAR_DEPEND = "CONSTANT"
		attribute VAR_DESCRIPTION = "Source of vertical profile of H2O adopted in the target gas (e.g. MERRA2; ECMWF; NCEP; or retrieved separately from dedicated microwindow )"
		attribute VAR_FILL_VALUE = ""
		attribute VAR_NAME = "H2O.MIXING.RATIO.VOLUME.DRY_APRIORI.SOURCE"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "1"
		attribute VAR_SI_CONVERSION = ""
		attribute VAR_UNITS = ""
		attribute VAR_VALID_MAX = ""
		attribute VAR_VALID_MIN = ""
		vdata "" class "SDSVar": fields SDS variable; 0 records
	vgroup "H2O.COLUMN_APRIORI" class "Var0.0"
		attribute VAR_DATA_TYPE = "REAL"
		attribute VAR_DEPEND = "DATETIME"
		attribute VAR_DESCRIPTION = "a priori total vertical H2O column between boundaries of altitude grid"
		attribute VAR_FILL_VALUE = -100000000.0
		attribute VAR_NAME = "H2O.COLUMN_APRIORI"
		attribute VAR_NOTES = ""
		attribute VAR_SIZE = "15"
		attribute VAR_SI_CONVERSION = "0.0;1.66054E1;mol m-2"
		attribute VAR_UNITS = "Zmolec cm-2"
		attribute VAR_VALID_MAX = 130.570572
		attribute VAR_VALID_MIN = 111.438889
		vdata "" class "SDSVar": fields SDS variable; 0 records
	attribute DS_NAME = "Langerock;Bavo"
	attribute DS_EMAIL = "bavo.langerock@bira-iasb.oma.be"
	attribute DS_ADDRESS = "Ringlaan 3;B-1180 Brussels;BELGIUM"
	attribute DS_AFFILIATION = "Royal Belgian Institute for Space Aeronomy;BIRA.IASB"
	attribute FILE_ACCESS = "NDACC"
	attribute FILE_PROJECT_ID = "CAMS2-27"
	attribute FILE_DOI = "https://doi.org/10.60897/ndacc.xianghe_ftir.h2co_cas.iap001_rd"
	attribute FILE_ASSOCIATION = "NDACC"
	attribute DATA_DISCIPLINE = "ATMOSPHERIC.CHEMISTRY;REMOTE.SENSING;GROUNDBASED"
	attribute DATA_GROUP = "EXPERIMENTAL;PROFILE.STATIONARY"
	attribute DATA_DESCRIPTION = "FTIR formaldehyde data, retrieval strategy is described in https://doi.org/10.5194/amt-11-5049-2018. The Xianghe FTIR instrument is described in https://doi.org/10.5194/amt-17-6385-2024. Data users are kindly invited to contact the project manager or contact person to collaborate to ensure a proper use of the FTIR data (e.g. appropriate use of the averaging kernels). Collaborators(+ORCID): De Maziere;Martine"
	attribute DATA_MODIFICATIONS = ""
	attribute DATA_CAVEATS = ""
	attribute DATA_RULES_OF_USE = "The data is licensed under CC BY 4.0 https://creativecommons.org/licenses/by/4.0/"
	attribute DATA_ACKNOWLEDGEMENT = "FTIR measurements at the Xianghe station are funded by the Chinese Academy of Sciences (CAS)."
	attribute DATA_VARIABLES = "DATETIME;INTEGRATION.TIME;LATITUDE.INSTRUMENT;LONGITUDE.INSTRUMENT;ALTITUDE.INSTRUMENT;SURFACE.PRESSURE_INDEPENDENT;SURFACE.PRESSURE_INDEPENDENT_SOURCE;SURFACE.TEMPERATURE_INDEPENDENT;SURFACE.TEMPERATURE_INDEPENDENT_SOURCE;HUMIDITY.RELATIVE.SURFACE_INDEPENDENT;HUMIDITY.RELATIVE.SURFACE_INDEPENDENT_SOURCE;WIND.DIRECTION.SURFACE_INDEPENDENT;WIND.DIRECTION.SURFACE_INDEPENDENT_SOURCE;WIND.SPEED.SURFACE_INDEPENDENT;WIND.SPEED.SURFACE_INDEPENDENT_SOURCE;ALTITUDE;ALTITUDE.BOUNDARIES;PRESSURE_INDEPENDENT;PRESSURE_INDEPENDENT_SOURCE;TEMPERATURE_INDEPENDENT;TEMPERATURE_INDEPENDENT_SOURCE;DRY.AIR.COLUMN.PARTIAL_INDEPENDENT;DRY.AIR.COLUMN.PARTIAL_INDEPENDENT_SOURCE;H2CO.MIXING.RATIO.VOLUME.DRY_ABSORPTION.SOLAR;H2CO.MIXING.RATIO.VOLUME.DRY_APRIORI;H2CO.MIXING.RATIO.VOLUME.DRY_APRIORI.SOURCE;H2CO.MIXING.RATIO.VOLUME.DRY_ABSORPTION.SOLAR_AVK;H2CO.MIXING.RATIO.VOLUME.DRY_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM.COVARIANCE;H2CO.MIXING.RATIO.VOLUME.DRY_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC.COVARIANCE;H2CO.COLUMN.PARTIAL_ABSORPTION.SOLAR;H2CO.COLUMN.PARTIAL_APRIORI;H2CO.COLUMN_ABSORPTION.SOLAR;H2CO.COLUMN_APRIORI;H2CO.COLUMN_ABSORPTION.SOLAR_AVK;H2CO.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM.STANDARD;H2CO.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC.STANDARD;ANGLE.SOLAR_ZENITH.ASTRONOMICAL;ANGLE.SOLAR_AZIMUTH;LATITUDE_LOS;LONGITUDE_LOS;H2O.MIXING.RATIO.VOLUME.DRY_APRIORI;H2O.MIXING.RATIO.VOLUME.DRY_APRIORI.SOURCE;H2O.COLUMN_APRIORI"
	attribute DATA_PROCESSOR = "SFIT4 1.1.0"
	attribute DATA_TEMPLATE = "GEOMS-TE-FTIR-003"
	attribute FILE_META_VERSION = "04R081;CUSTOM"
	attribute PI_NAME = "Zhou;Minqiang"
	attribute PI_EMAIL = "minqiang.zhou@mail.iap.ac.cn"
	attribute PI_ADDRESS = "40 Huayanli, Chaoyang;100029 Beijing;CHINA"
	attribute PI_AFFILIATION = "Chinese Academy of Sciences - Institute of Atmospheric Physics;CAS.IAP"
	attribute DATA_LOCATION = "XIANGHE"
	attribute DO_NAME = "Vigouroux;Corinne"
	attribute DO_EMAIL = "corinnev@bira-iasb.oma.be"
	attribute DO_ADDRESS = "Ringlaan 3;B-1180 Brussels;BELGIUM"
	attribute DO_AFFILIATION = "Royal Belgian Institute for Space Aeronomy;BIRA.IASB"
	attribute DATA_SOURCE = "FTIR.H2CO_CAS.IAP001"
	attribute DATA_QUALITY = "RD"
	attribute DATA_FILE_VERSION = "001"
	attribute DATA_START_DATE = "20260810T020536Z"
	attribute DATA_STOP_DATE = "20260814T081437Z"
	attribute FILE_NAME = "groundbased_ftir.h2co_cas.iap001_xianghe_20260810t020536z_20260814t081437z_001.hdf"
	attribute FILE_GENERATION_DATE = "20260824T144339Z"