# ESACCI_OZONE_L2_NP

## Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of ESACCI_OZONE_L2_NP data.

field name

type

dimensions

unit

description

scan_subindex

int16

{time}

zero-based index of the instantaneous field of view within the swath

datetime

double

{time}

[hours since 2000-01-01]

time of the measurement

longitude

float

{time}

[degree_east]

longitude of the ground pixel center

latitude

float

{time}

[degree_north]

latitude of the ground pixel center

longitude_bounds

float

{time, 4}

[degree_east]

longitudes of the ground pixel corners

latitude_bounds

float

{time, 4}

[degree_north]

latitudes of the ground pixel corners

sensor_zenith_angle

float

{time}

[degree]

zenith angle of the sensor at the ground pixel center

solar_zenith_angle

float

{time}

[degree]

zenith angle of the Sun at the ground pixel center

pressure

float

{vertical}

[hPa]

pressure

O3_number_density

float

{time, vertical}

[molec/cm3]

O3 number density

O3_number_density_uncertainty

float

{time, vertical}

[molec/cm3]

uncertainty of the O3 number density

O3_number_density_covariance

float

{time, vertical, vertical}

[(molec/cm3)2]

O3 number density solution covariance matrix

O3_number_density_avk

float

{time, vertical, vertical}

[]

O3 number density averaging kernel

O3_volume_mixing_ratio

float

{time, vertical}

[ppv]

O3 volume mixing ratio

O3_volume_mixing_ratio_uncertainty

float

{time, vertical}

[ppv]

uncertainty of the O3 volume mixing ratio

O3_volume_mixing_ratio_apriori

float

{time, vertical}

[ppv]

O3 volume mixing ratio apriori

O3_volume_mixing_ratio_apriori_uncertainty

float

{time, vertical}

[ppv]

uncertainty of the O3 volume mixing ratio apriori

cloud_fraction

double

{time}

[]

effective cloud fraction

cloud_top_pressure

double

{time}

[hPa]

cloud top pressure

cloud_top_albedo

double

{time}

[]

cloud top albedo

surface_albedo

float

{time}

[]

surface albedo

surface_pressure

float

{time}

[hPa]

surface pressure

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

scan_subindex

path

/scp[]

datetime

path

/@Data_date, /time[]

description

datetime converted from the epoch of the product and an offset in hours to hours since 2000-01-01

longitude

path

/lon[]

latitude

path

/lat[]

longitude_bounds

path

/ll[]

description

longitudes and latitudes of the ground pixel corners are stored interleaved; longitudes are ingested as [ll[,1], ll[,3], ll[,7], ll[,5]]; note the reordering of the last two values to ensure a simple polygon

latitude_bounds

path

/ll[]

description

longitudes and latitudes of the ground pixel corners are stored interleaved; latitudes are ingested as [ll[,0], ll[,2], ll[,6], ll[,4]]; note the reordering of the last two values to ensure a simple polygon

sensor_zenith_angle

path

/lza[]

solar_zenith_angle

path

/sza[]

pressure

path

/levs[]

O3_number_density

path

/o3_nd[]

O3_number_density_uncertainty

path

/o3_nd[], /o3_error[]

description

derived from the relative error in percent as: o3_error[] * 0.01 * o3_nd[]

O3_number_density_covariance

path

/sx[]

O3_number_density_avk

path

/ak[]

O3_volume_mixing_ratio

path

/o3_vmr[]

O3_volume_mixing_ratio_uncertainty

path

/o3_vmr[], /o3_error[]

description

derived from the relative error in percent as: o3_error[] * 0.01 * o3_vmr[]

O3_volume_mixing_ratio_apriori

path

/o3_ap[]

O3_volume_mixing_ratio_apriori_uncertainty

path

/o3_ap[], /o3_ap_error[]

description

derived from the relative error in percent as: o3_ap_error[] * 0.01 * o3_ap[]

cloud_fraction

path

/cloudf[]

cloud_top_pressure

path

/cloudp[]

cloud_top_albedo

path

/clouda[]

surface_albedo

path

/salb[]

surface_pressure

path

/spres[]