Some data access methods may occasionally be unavailable due to issues with Earthdata Common Metadata Repository's cloud provider. We apologize for any inconvenience.
Data for new versions of SMAP Level-4 data sets are currently available from 31 March 2015 through present. Data prior to 27 August 2020 are being reprocessed with the latest version of input data and will become available as they are completed.
Data Set ID: 
SPL4CMDL

SMAP L4 Global Daily 9 km EASE-Grid Carbon Net Ecosystem Exchange, Version 5

The Level-4 (L4) carbon product (SPL4CMDL) provides global gridded daily estimates of net ecosystem carbon (CO2) exchange derived using a satellite data based terrestrial carbon flux model informed by the following: Soil Moisture Active Passive (SMAP) L-band microwave observations, land cover and vegetation inputs from the Moderate Resolution Imaging Spectroradiometer (MODIS), Visible Infrared Imaging Radiometer Suite (VIIRS), and the Goddard Earth Observing System Model, Version 5 (GEOS-5) land model assimilation system. Parameters are computed using an Earth-fixed, global cylindrical 9 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) projection.

This is the most recent version of these data.

Version Summary: 

Changes to this version primarily represent changes to the model inputs and model Biome Properties Look-up Table (BPLUT) calibration rather than changes to the internal model structure or code. The Version 5 product accuracy and performance is largely consistent with Version 4. Specific changes include:
- Revised Level-4 carbon global model calibration and soil organic carbon (SOC) initialization using the latest SMAP Nature Run (NRv8.3) soil moisture and soil temperature data, and MERRA-2 surface meteorology.
- The carbon model BPLUT has been recalibrated using a FLUXNET2015 global tower site record that includes 329 sites representing all major global plant functional type (PFT) classes.
- Implemented minor changes to spatial weighting of FLUXNET2015 tower sites in the Level-4 carbon model BPLUT calibration. Northern (≥ 45°N) tower sites now have greater impact in defining global PFT response characteristics; whereby, the adjusted weighting is designed to enhance product performance in boreal-arctic biomes. It also incorporated a more detailed set of PFT realistic range constraints for the BPLUT parameters prior to the model calibration and optimization.
- Enhanced an attribute in the legend_carbon_model_bitflag data field to include descriptions of the bit values.

COMPREHENSIVE Level of Service

Data: Data integrity and usability verified; data customization services available for select data

Documentation: Key metadata and comprehensive user guide available

User Support: Assistance with data access and usage; guidance on use of data in tools and data customization services

See All Level of Service Details

Parameter(s):
  • SOILS > SOIL PRODUCTIVITY > GROSS PRIMARY PRODUCTION (GPP)
  • SOILS > SOIL RESPIRATION > HETEROTROPHIC RESPIRATION (Rh)
  • SOILS > CARBON > NET ECOSYSTEM CO2 EXCHANGE (NEE)
  • SOILS > CARBON > SOIL ORGANIC CARBON (SOC)
Data Format(s):
  • HDF5
Spatial Coverage:
N: 85.044, 
S: -85.044, 
E: 180, 
W: -180
Platform(s):Aqua, GEOS-5, L4_C, SMAP, SUOMI-NPP, Terra
Spatial Resolution:
  • 9 km x 9 km
Sensor(s):MODIS, NOT APPLICABLE, SMAP L-BAND RADIOMETER, VIIRS
Temporal Coverage:
  • 31 March 2015
Version(s):V5
Temporal Resolution1 dayMetadata XML:View Metadata Record
Data Contributor(s):Kimball, J. S., L. A. Jones, A. Endsley, T. Kundig, and R. Reichle.

Geographic Coverage

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As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Kimball, J. S., L. A. Jones, A. Endsley, T. Kundig, and R. Reichle. 2020. SMAP L4 Global Daily 9 km EASE-Grid Carbon Net Ecosystem Exchange, Version 5. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/9IKKQ4BL3PK8. [Date Accessed].

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How To

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