# ESACCI_GHG_L3_Obs4MIPs

## Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of `ESACCI_GHG_L3_Obs4MIPs` data.

field name | type | dimensions | unit | description
--- | --- | --- | --- | ---
datetime | double | {time} | [seconds since 2000-01-01] | time of the measurement
latitude | double | {latitude} | [degree_north] | latitude of the ground pixel center
longitude | double | {longitude} | [degree_east] | longitude of the ground pixel center
CH4_column_volume_mixing_ratio | double | {time, latitude, longitude} | [ppmv] | CH4 column volume mixing ratio
CH4_column_volume_mixing_ratio_uncertainty | double | {time, latitude, longitude} | [ppmv] | CH4 column volume mixing ratio standard deviation
CO2_column_volume_mixing_ratio | double | {time, latitude, longitude} | [ppmv] | CO2 column volume mixing ratio
CO2_column_volume_mixing_ratio_uncertainty | double | {time, latitude, longitude} | [ppmv] | CO2 column volume mixing ratio standard deviation
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 | path | time[]
latitude | path | lat[]
longitude | path | long[]
CH4_column_volume_mixing_ratio | available | optional
path | xch4[]
CH4_column_volume_mixing_ratio_uncertainty | available | optional
path | xch4_stddev[]
CO2_column_volume_mixing_ratio | available | optional
path | xco2[]
CO2_column_volume_mixing_ratio_uncertainty | available | optional
path | xco2_stddev[]