# ESACCI_OZONE_L3_NP

## Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of ESACCI_OZONE_L3_NP data.

field name

type

dimensions

unit

description

datetime_start

double

{time}

[seconds since 2000-01-01]

time coverage start

datetime_stop

double

{time}

[seconds since 2000-01-01]

time coverage end

longitude

float

{longitude}

[degree_east]

longitude of the grid cell center

latitude

float

{latitude}

[degree_north]

latitude of the grid cell center

pressure

float

{latitude, longitude, vertical}

[hPa]

air pressure profile

pressure_bounds

float

{latitude, longitude, vertical, 2}

[hPa]

air pressure boundaries for each profile level

O3_number_density

float

{latitude, longitude, vertical}

[molec/cm^3]

O3 number density

O3_number_density_uncertainty

float

{latitude, longitude, vertical}

[molec/cm^3]

uncertainty of the O3 number density

O3_volume_mixing_ratio

float

{latitude, longitude, vertical}

[ppmv]

O3 volume mixing ratio

O3_volume_mixing_ratio_uncertainty

float

{latitude, longitude, vertical}

[ppmv]

uncertainty of the O3 volume mixing ratio

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

datetime_start

path

/@time_coverage_start

description

datetime converted from a start date to seconds since 2000-01-01

datetime_stop

path

/@time_coverage_end

description

datetime converted from an end date to seconds since 2000-01-01

longitude

path

/lon[]

latitude

path

/lat[]

pressure

path

/surface_pressure[], /air_pressure[]

description

repeat location independent air pressure profile (/air_pressure[]) for each grid point and replace value at the lowest level by location dependent surface pressure (/surface_pressure[])

pressure_bounds

path

/surface_pressure[], /air_pressure[]

description

repeat location independent air pressure profile (/air_pressure[]) for each grid point and replace value at the lowest level by location dependent surface pressure (/surface_pressure[]); upper and lower pressure for each profile is based on log-linear interpolation of profile (i.e. upper bound is sqrt(pressure[i+1] * pressure[i]), and lower bound is sqrt(pressure[i] * pressure[i-1])); the lower bound of level 0 is set to pressure[0] and the upper bound for level n-1 is set to pressure[n-1]

O3_number_density

path

/O3_ndens[]

O3_number_density_uncertainty

path

/O3e_ndens[]

O3_volume_mixing_ratio

path

/O3_vmr[]

O3_volume_mixing_ratio_uncertainty

path

/O3e_vmr[]