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Description

Version 9r is the current version of the data set. Older versions will no longer be available and are superseded by Version 9r.
The ACOS Lite files contain bias-corrected XCO2 along with other select fields aggregated as daily files. Orbital granules of the ACOS Level 2 standard product (ACOS_L2S) are used as input.

The "ACOS" data set contains Carbon Dioxide (CO2) column averaged dry air mole fraction for all soundings for which retrieval was attempted. These are the highest-level products made available by the OCO Project, using TANSO-FTS spectral radiances.

The GOSAT team at JAXA produces GOSAT TANSO-FTS Level 1B (L1B) data products for internal use and for distribution to collaborative partners, such as ESA and NASA. These calibrated products are augmented by the OCO Project with additional geolocation information and further corrections. Thus produced Level 1B products (with calibrated radiances and geolocation) are the input to the "ACOS" Level 2 production process.

Version Description

Not provided

Product Summary

Platforms
GOSAT
Instruments
TANSO-FTS
Spatial Extent

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

Location
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2009-04-20
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
C1720416694-GES_DISC
Data State
ACTIVE
Number of Files/Granules
3958
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 Jet Propulsion Laboratory. (2020). ACOS GOSAT/TANSO-FTS Level 2 bias-corrected XCO2 and other select fields from the full-physics retrieval aggregated as daily files V9r [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/VWSABTO7ZII4 Date Accessed: 2026-02-21

Documents

Variables

The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.

For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
bands bands from ACOS_L2_Lite_FP_9r N/A N/A N/A N/A N/A
co2_profile_apriori CO2 Apriori Profile from ACOS_L2_Lite_FP_9r ppm float32 N/A N/A N/A
date Observation date and time matching sounding_id from ACOS_L2_Lite_FP_9r none int16 N/A N/A N/A
file_index L2 File Index from ACOS_L2_Lite_FP_9r none uint8 N/A N/A N/A
latitude latitude from ACOS_L2_Lite_FP_9r degrees_north float32 N/A N/A N/A
levels levels from ACOS_L2_Lite_FP_9r N/A N/A N/A N/A N/A
longitude longitude from ACOS_L2_Lite_FP_9r degrees_east float32 N/A N/A N/A
Meteorology/windspeed_u_met Apriori Surface Wind Speed, U Component from ACOS_L2_Lite_FP_9r m/s float32 N/A N/A N/A
Meteorology/windspeed_v_met Apriori Surface Wind Speed, V Component from ACOS_L2_Lite_FP_9r m/s float32 N/A N/A N/A
Preprocessors/co2_ratio CO2 Ratio from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Preprocessors/dp_abp delta_surface_pressure_abp from ACOS_L2_Lite_FP_9r hPa float32 N/A N/A N/A
Preprocessors/h2o_ratio H2O Ratio from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Preprocessors/xco2_strong_idp xco2_strong from ACOS_L2_Lite_FP_9r ppm float32 N/A N/A N/A
Preprocessors/xco2_weak_idp xco2_weak from ACOS_L2_Lite_FP_9r ppm float32 N/A N/A N/A
pressure_levels Pressure_Levels from ACOS_L2_Lite_FP_9r hPa float32 N/A N/A N/A
pressure_weight Pressure Weighting Function from ACOS_L2_Lite_FP_9r none float32 N/A N/A N/A
Retrieval/albedo_o2a Band 1 Albedo from ACOS_L2_Lite_FP_9r none float32 N/A N/A N/A
Retrieval/albedo_sco2 Band 3 Albedo from ACOS_L2_Lite_FP_9r none float32 N/A N/A N/A
Retrieval/albedo_slope_o2a Retrieved Band 1 reflectance slope (land), or slope of lambertian albedo component of BRDF (ocean) from ACOS_L2_Lite_FP_9r per wn float32 N/A N/A N/A
Retrieval/albedo_slope_sco2 Retrieved Band 3 reflectance slope (land), or slope of lambertian albedo component of BRDF (ocean) from ACOS_L2_Lite_FP_9r per wn float32 N/A N/A N/A
Retrieval/albedo_slope_wco2 Retrieved Band 2 reflectance slope (land), or slope of lambertian albedo component of BRDF (ocean) from ACOS_L2_Lite_FP_9r per wn float32 N/A N/A N/A
Retrieval/albedo_wco2 Band 2 Albedo from ACOS_L2_Lite_FP_9r none float32 N/A N/A N/A
Retrieval/aod_bc Black Carbon Optical Depth from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/aod_dust Dust Aerosol Optical Depth from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/aod_fine AOD Fine-Mode Optical Depth from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/aod_ice Ice Cloud Optical Depth from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/aod_oc Organic Carbon Optical Depth from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/aod_seasalt Sea Salt Optical Depth from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/aod_strataer Stratospheric Aerosol Optical Depth from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/aod_sulfate Sulfate Aerosol Optical Depth from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/aod_total Total Cloud+Aerosol Optical Depth from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/aod_water Water Cloud Optical Depth from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/chi2_o2a Band 1 Reduced Chi-Squared of L2 Fit from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/chi2_sco2 Band 3 Reduced Chi-Squared of L2 Fit from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/chi2_wco2 Band 2 Reduced Chi-Squared of L2 Fit from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/co2_grad_del Change in CO2 vertical gradient (surface minus level 13), retrieved-apriori from ACOS_L2_Lite_FP_9r ppm float32 N/A N/A N/A
Retrieval/deltaT Retrieved Offset to Prior Temperature Profile in Kelvin from ACOS_L2_Lite_FP_9r Kelvin float32 N/A N/A N/A
Retrieval/diverging_steps diverging_steps from ACOS_L2_Lite_FP_9r none int8 N/A N/A N/A
Retrieval/dp Delta Psurf from L2 from ACOS_L2_Lite_FP_9r hPa float32 N/A N/A N/A
Retrieval/dpfrac dpfrac from ACOS_L2_Lite_FP_9r ppm float32 N/A N/A N/A
Retrieval/dust_height Dust Height from ACOS_L2_Lite_FP_9r P/Psurf float32 N/A N/A N/A
Retrieval/dws Dust+Water+SeaSalt from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/eof1_3 Band 1, EOF 3 from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/eof2_3 Band 2, EOF 3 from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/eof3_2 Band 3, EOF 2 from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/eof3_3 Band 3, EOF 3 from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/fs Retrieved Fluorescence at 757 nm from ACOS_L2_Lite_FP_9r W/m^2/um/sr float32 N/A N/A N/A
Retrieval/h2o_scale Retrieved scale factor to Prior Water Vapor Profile from ACOS_L2_Lite_FP_9r dimensionless float32 N/A N/A N/A
Retrieval/ice_height Ice Cloud Height from ACOS_L2_Lite_FP_9r P/Psurf float32 N/A N/A N/A
Retrieval/iterations Iterations from ACOS_L2_Lite_FP_9r none int8 N/A N/A N/A
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