# OSIRIS_L2_NO2_MART

## Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of OSIRIS_L2_NO2_MART data.

field name

type

dimensions

unit

description

datetime

double

{time}

[seconds since 2000-01-01]

time of the measurement

latitude

double

{time}

[degree_north]

center latitude for a profile

longitude

double

{time}

[degree_east]

center longitude for a profile

altitude

double

{time, vertical}

[km]

altitude in km for each profile element

no2_vmr

double

{time, vertical}

[ppmv]

volume mixing ratio of NO2

no2_vmr_error

double

{time, vertical}

[ppmv]

precision of the volume mixing ratio of NO2

no2

double

{time, vertical}

[molec/cm3]

NO2 number density

solar_zenith_angle

double

{time}

[degree]

solar zenith angle at the tangent point of the measurement; 0 is sun overhead, 90 is sun on the horizon

solar_azimuth_angle

double

{time}

[degree]

solar azimuth angle at the tangent point of the measurement; 0 is due North, 90 is due East, 180 is South and 270 is West

index

int32

{time}

zero-based index of the sample within the source product

## Mapping description

OSIRIS Level 2 products only contain a single profile; all measured profile points will be provided in reverse order (from low altitude to high altitude) in the profile

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

field name

mapping description

datetime

path

/HDFEOS/SWATHS/OSIRIS_Odin_NO2MART/Geolocation_Fields/Time[]

description

time converted from TAI93 to seconds since 2000-01-01

latitude

path

/HDFEOS/SWATHS/OSIRIS_Odin_NO2MART/Geolocation_Fields/Latitude[]

longitude

path

/HDFEOS/SWATHS/OSIRIS_Odin_NO2MART/Geolocation_Fields/Longitude[]

altitude

path

/HDFEOS/SWATHS/OSIRIS_Odin_NO2MART/Geolocation_Fields/Altitude[]

description

altitude information will be duplicated for each profile

no2_vmr

path

/HDFEOS/SWATHS/OSIRIS_Odin_NO2MART/Data_Fields/NO2[]

description

ppmv

no2_vmr_error

path

/HDFEOS/SWATHS/OSIRIS_Odin_NO2MART/Data_Fields/NO2Precision[]

description

ppmv

no2

path

/HDFEOS/SWATHS/OSIRIS_Odin_NO2MART/Data_Fields/NO2NumberDensity[]

solar_zenith_angle

path

/HDFEOS/SWATHS/OSIRIS_Odin_NO2MART/Geolocation_Fields/SolarZenithAngle[]

solar_azimuth_angle

path

/HDFEOS/SWATHS/OSIRIS_Odin_NO2MART/Geolocation_Fields/SolarAzimuthAngle[]