GOME_L2

Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of GOME_L2 data.

field name

type

dimensions

unit

description

datetime_stop

double

{time}

[seconds since 2000-01-01]

time of the measurement at end of integration time

datetime_length

double

{time}

[s]

measurement integration time

orbit_index

int32

absolute orbit number

latitude

double

{time}

[degree_north]

tangent latitude of the measurement

longitude

double

{time}

[degree_east]

tangent longitude of the measurement

latitude_bounds

double

{time, 4}

[degree_north]

corner latitudes for the ground pixel of the measurement

longitude_bounds

double

{time, 4}

[degree_east]

corner longitudes for the ground pixel of the measurement

O3_column_number_density

double

{time}

[molec/cm^2]

ozone total column

O3_column_number_density_uncertainty

double

{time}

[molec/cm^2]

error on the ozone total column

NO2_column_number_density

double

{time}

[molec/cm^2]

NO2 total column

NO2_column_number_density_uncertainty

double

{time}

[molec/cm^2]

error on the NO2 total column

cloud_fraction

double

{time}

[]

cloud fraction

cloud_fraction_uncertainty

double

{time}

[]

cloud fraction error

cloud_top_height

double

{time}

[km]

cloud top height

cloud_top_height_uncertainty

double

{time}

[km]

cloud top height uncertainty

cloud_top_pressure

double

{time}

[hPa]

cloud top pressure

cloud_top_pressure_uncertainty

double

{time}

[hPa]

cloud top pressure uncertainty

cloud_top_albedo

double

{time}

[]

cloud top albedo

cloud_top_albedo_uncertainty

double

{time}

[]

cloud top albedo uncertainty

surface_pressure

double

{time}

[hPa]

surface pressure

surface_height

double

{time}

[km]

surface height

surface_albedo

double

{time}

[]

surface albedo

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_subindex

int8

{time}

relative index (0-3) of this measurement within a scan (forward + backward)

scan_direction_type

int8

{time}

scan direction for each measurement; enumeration values: forward (0), backward (1)

index

int32

{time}

zero-based index of the sample within the source product

Ingestion options

The table below lists the available ingestion options for GOME_L2 products.

option name

legal values

description

ozone

vcd1

the fitting window choice for ozone to ingest; either window 0 (default) or window 1 (ozone=vcd1)

Mapping description

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

field name

mapping description

datetime_stop

path

/ddr[]/glr/datetime

datetime_length

description

set to a fixed value of 1.5s for all pixels

orbit_index

path

/pir/start_orbit

latitude

path

/ddr[]/glr/corners[4]/lat

longitude

path

/ddr[]/glr/corners[4]/lon

description

each longitude will be transformed from a value in the range 0 - 360 to a value in the range -180 - 180

latitude_bounds

path

/ddr[]/glr/corners[0:3]/lat

description

the corners are rearranged in the following way: 1,3,2,0

longitude_bounds

path

/ddr[]/glr/corners[0:3]/lon

description

the corners are rearranged in the following way: 1,3,2,0

O3_column_number_density

condition

ozone unset

path

/ddr[]/irr/vcd[0]/total

condition

ozone=vcd1

path

/ddr[]/irr/vcd[1]/total

O3_column_number_density_uncertainty

condition

ozone unset

path

/ddr[]/irr/vcd[0]/total, /ddr[]/irr/vcd[0]/error

description

relative error is converted to absolute error by multiplying with measured value

condition

ozone=vcd1

path

/ddr[]/irr/vcd[1]/total, /ddr[]/irr/vcd[1]/error

description

relative error is converted to absolute error by multiplying with measured value

NO2_column_number_density

path

/ddr[]/irr/vcd[2]/total

NO2_column_number_density_uncertainty

path

/ddr[]/irr/vcd[2]/total, /ddr[]/irr/vcd[2]/error

description

relative error is converted to absolute error by multiplying with measured value

cloud_fraction

condition

version=1

path

/ddr[]/irr/icfa/frac

condition

version>1

path

/ddr[]/irr/ocra/cloud_frac

cloud_fraction_uncertainty

condition

version=1

path

/ddr[]/irr/icfa/frac, /ddr[]/irr/icfa/err_frac

description

relative error is converted to absolute error by multiplying with measured value

condition

version>1

path

/ddr[]/irr/ocra/cloud_frac, /ddr[]/irr/ocra/cloud_frac_error

description

relative error is converted to absolute error by multiplying with measured value

cloud_top_height

available

optional

condition

version>1

path

/ddr[]/irr/rocinn/height

cloud_top_height_uncertainty

available

optional

condition

version>1

path

/ddr[]/irr/rocinn/height, /ddr[]/irr/rocinn/height_error

description

relative error is converted to absolute error by multiplying with measured value

cloud_top_pressure

condition

version=1

path

/ddr[]/irr/icfa/press

condition

version>1

path

/ddr[]/irr/rocinn/pressure

cloud_top_pressure_uncertainty

condition

version=1

path

/ddr[]/irr/icfa/press, /ddr[]/irr/icfa/err_press

description

relative error is converted to absolute error by multiplying with measured value

condition

version>1

path

/ddr[]/irr/rocinn/pressure, /ddr[]/irr/rocinn/pressure_error

description

relative error is converted to absolute error by multiplying with measured value

cloud_top_albedo

available

optional

condition

version>1

path

/ddr[]/irr/rocinn/albedo

cloud_top_albedo_uncertainty

available

optional

condition

version>1

path

/ddr[]/irr/rocinn/albedo, /ddr[]/irr/rocinn/albedo_error

description

relative error is converted to absolute error by multiplying with measured value

surface_pressure

condition

version=1

path

/ddr[]/irr/icfa/surf_press

condition

version>1

path

/ddr[]/irr/surface_pressure

surface_height

available

optional

condition

version>1

path

/ddr[]/irr/surface_height

surface_albedo

available

optional

condition

version>1

path

/ddr[]/irr/surface_albedo

solar_zenith_angle

path

/ddr[]/glr/sza_toa[1]

viewing_zenith_angle

path

/ddr[]/glr/line_sight_toa[1]

relative_azimuth_angle

path

/ddr[]/glr/rel_azi_toa[1]

scan_subindex

path

/ddr[]/glr/subset_counter

description

relative index (0-3) of this measurement within a scan (forward + backward)

scan_direction_type

path

/ddr[]/glr/subset_counter

description

the scan direction is based on the subset_counter of the measurement; 0-2: forward (0), 3: backward (1)