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Description

Version 10r is the current version of the data set. Older versions will no longer be available and are superseded by Version 10r.

The OCO-2 Lite files contain bias-corrected XCO2 along with other select fields aggregated as daily files.

In early 2021, the OCO Team identified an issue with OCO-2 level 2 products processed since January 28, 2020. The Ancillary Geometric Product (AGAP) file, a static file used in OCO-2 Geolocation processing, was inadvertently replaced with an obsolete version. This AGAP file included a ~300 m pointing error. As a result, all OCO-2 Level 2, version 10r, data files for the period January 28 - December 31, 2020, were corrected and replaced. The replacement process was completed by the end of June, 2021. The significance of this error has been described in Kiel et al. (2019; doi:10.5194/amt-12-2241-2019).

The Orbiting Carbon Observatory is the first NASA mission designed to collect space-based measurements of atmospheric carbon dioxide with the precision, resolution, and coverage needed to characterize the processes controlling its buildup in the atmosphere. The OCO-2 project uses the LEOStar-2 spacecraft that carries a single instrument. It incorporates three high-resolution spectrometers that make coincident measurements of reflected sunlight in the near-infrared CO2 near 1.61 and 2.06 micrometers and in molecular oxygen (O2) A-Band at 0.76 micrometers.

Product Summary

Platforms
OCO-2
Instruments
OCO-2
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2014-06-01 to 2022-03-01
Data Partner
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/GESDI
Concept ID
C1685783927-GES_DISC
Data State
COMPLETE
Number of Files/Granules
2557
Processing Level
2
Published
Updated
Science Keywords
Atmospheric Carbon Dioxide

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Science Data Operations System, J. P. L. (2020). OCO-2 Level 2 bias-corrected XCO2 and other select fields from the full-physics retrieval aggregated as daily files, Retrospective processing V10r [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/E4E140XDMPO2 Date Accessed: 2025-12-15

Documents

USER'S GUIDE

READ-ME

ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)

GENERAL DOCUMENTATION

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
bands bands N/A int16 N/A N/A N/A
co2_profile_apriori co2_profile_apriori ppm float32 N/A N/A N/A
date date none int16 N/A N/A N/A
file_index file_index none uint8 N/A N/A N/A
footprints footprints N/A int16 N/A N/A N/A
latitude latitude degrees_north float32 N/A N/A N/A
levels levels N/A int16 N/A N/A N/A
longitude longitude degrees_east float32 N/A N/A N/A
Meteorology/psurf_apriori_o2a Meteorology/psurf_apriori_o2a hPa float32 N/A N/A N/A
Meteorology/psurf_apriori_sco2 Meteorology/psurf_apriori_sco2 hPa float32 N/A N/A N/A
Meteorology/psurf_apriori_wco2 Meteorology/psurf_apriori_wco2 hPa float32 N/A N/A N/A
Meteorology/windspeed_u_met Meteorology/windspeed_u_met m/s float32 N/A N/A N/A
Meteorology/windspeed_v_met Meteorology/windspeed_v_met m/s float32 N/A N/A N/A
Preprocessors/co2_ratio Preprocessors/co2_ratio dimensionless float32 N/A N/A N/A
Preprocessors/co2_ratio_offset_per_footprint Preprocessors/co2_ratio_offset_per_footprint dimensionless float32 N/A N/A N/A
Preprocessors/dp_abp Preprocessors/dp_abp hPa float32 N/A N/A N/A
Preprocessors/h2o_ratio Preprocessors/h2o_ratio dimensionless float32 N/A N/A N/A
Preprocessors/h2o_ratio_offset_per_footprint Preprocessors/h2o_ratio_offset_per_footprint dimensionless float32 N/A N/A N/A
Preprocessors/max_declocking_o2a Preprocessors/max_declocking_o2a none float32 N/A N/A N/A
Preprocessors/max_declocking_sco2 Preprocessors/max_declocking_sco2 none float32 N/A N/A N/A
Preprocessors/max_declocking_wco2 Preprocessors/max_declocking_wco2 none float32 N/A N/A N/A
Preprocessors/xco2_strong_idp Preprocessors/xco2_strong_idp ppm float32 N/A N/A N/A
Preprocessors/xco2_weak_idp Preprocessors/xco2_weak_idp ppm float32 N/A N/A N/A
pressure_levels pressure_levels hPa float32 N/A N/A N/A
pressure_weight pressure_weight none float32 N/A N/A N/A
Retrieval/albedo_o2a Retrieval/albedo_o2a none float32 N/A N/A N/A
Retrieval/albedo_quad_o2a Retrieval/albedo_quad_o2a per wn^2 float32 N/A N/A N/A
Retrieval/albedo_quad_sco2 Retrieval/albedo_quad_sco2 per wn^2 float32 N/A N/A N/A
Retrieval/albedo_quad_wco2 Retrieval/albedo_quad_wco2 per wn^2 float32 N/A N/A N/A
Retrieval/albedo_sco2 Retrieval/albedo_sco2 none float32 N/A N/A N/A
Retrieval/albedo_slope_o2a Retrieval/albedo_slope_o2a per wn float32 N/A N/A N/A
Retrieval/albedo_slope_sco2 Retrieval/albedo_slope_sco2 per wn float32 N/A N/A N/A
Retrieval/albedo_slope_wco2 Retrieval/albedo_slope_wco2 per wn float32 N/A N/A N/A
Retrieval/albedo_wco2 Retrieval/albedo_wco2 none float32 N/A N/A N/A
Retrieval/aod_bc Retrieval/aod_bc dimensionless float32 N/A N/A N/A
Retrieval/aod_dust Retrieval/aod_dust dimensionless float32 N/A N/A N/A
Retrieval/aod_ice Retrieval/aod_ice dimensionless float32 N/A N/A N/A
Retrieval/aod_oc Retrieval/aod_oc dimensionless float32 N/A N/A N/A
Retrieval/aod_seasalt Retrieval/aod_seasalt dimensionless float32 N/A N/A N/A
Retrieval/aod_strataer Retrieval/aod_strataer dimensionless float32 N/A N/A N/A
Retrieval/aod_sulfate Retrieval/aod_sulfate dimensionless float32 N/A N/A N/A
Retrieval/aod_total Retrieval/aod_total dimensionless float32 N/A N/A N/A
Retrieval/aod_water Retrieval/aod_water dimensionless float32 N/A N/A N/A
Retrieval/chi2_o2a Retrieval/chi2_o2a dimensionless float32 N/A N/A N/A
Retrieval/chi2_sco2 Retrieval/chi2_sco2 dimensionless float32 N/A N/A N/A
Retrieval/chi2_wco2 Retrieval/chi2_wco2 dimensionless float32 N/A N/A N/A
Retrieval/co2_grad_del Retrieval/co2_grad_del ppm float32 N/A N/A N/A
Retrieval/deltaT Retrieval/deltaT Kelvin float32 N/A N/A N/A
Retrieval/diverging_steps Retrieval/diverging_steps none int8 N/A N/A N/A
Retrieval/dp Retrieval/dp hPa float32 N/A N/A N/A
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