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Data Set ID:
SPL4CMDL

SMAP L4 Global Daily 9 km EASE-Grid Carbon Net Ecosystem Exchange, Version 6

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 reflect BPLUT recalibration and SOC re-initialization in response to updates to the upstream input datasets. Specifically:
• Revised SPL4CMDL global BPLUT calibration and SOC initialization using the latest SMAP Nature Run (NRv9.1) soil moisture and soil temperature data, and MERRA-2 surface meteorology.
• The carbon model BPLUT, Vv6040, has been recalibrated using the most recent FLUXNET2015 global tower site synthesis record, which includes 356 sites representing all major global plant functional type (PFT) classes.
• Adjusted model SOC decay parameters based on comparison with other global assessments, which reduced SOC storage estimates in the tropics (20 S – 20 N) from the previous (V5) SPL4CMDL product release.

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):V6
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. 2021. SMAP L4 Global Daily 9 km EASE-Grid Carbon Net Ecosystem Exchange, Version 6. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/L6C9EY1O8VIC. [Date Accessed].

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