The NASA SMAP Level 4 Carbon (L4_C) Product Suite
The primary science objectives of the SMAP Level 4 Carbon (L4_C) product
are to:
• Determine Net carbon Ecosystem Exchange (NEE) regional patterns and temporal (daily, seasonal, and annual) behavior to within the accuracy range of in situ tower measurements of these processes;
• Link NEE estimates with component carbon fluxes, Gross Primary Productivity (GPP) and ecosystem respiration (RH), and the primary environmental constraints (EC) to ecosystem productivity and respiration.
Fig 1 (left): Overview of the SMAP L4_C product elements.
Fig 2 (right): Gross primary productivity (GPP) from the SMAP L4_C product and independent observations.
L4_C algorithm
Terrestrial Carbon Flux (TCF) model developed at the University of Montana
NASA SMAP L4_SM soil moisture and soil temperature
Surface meteorological data from the NASA GEOS-5 Forward Processing system
References
Entekhabi, D. et al. 2014. SMAP Handbook–Soil Moisture Active Passive: Mapping Soil Moisture and Freeze/Thaw from Space. Pasadena, CA USA: SMAP Project, JPL CL#14-2285, Jet Propulsion Laboratory.
Glassy, J., J.S. Kimball, L. Jones, R. H., Reichle, R. A. Lucchesi, J. V. Ardizzone, G.-K. Kim, E. B. Smith, and B. H. Weiss, 2015: Soil Moisture Active Passive (SMAP) Mission Level 4 Carbon (L4_C) Product Specification Document. GMAO Office Note No. 11 (Version 1.9), 65 pp, NASA Goddard Space Flight Center, Greenbelt, MD, USA. Available from http://gmao.gsfc.nasa.gov/pubs/office_notes/.
Kimball, J. S., L. A. Jones, J. P. Glassy, and R. Reichle. 2014. SMAP Algorithm Theoretical Basis Document, Release A: L4 Carbon Product. SMAP Project, JPL D-66484, Jet Propulsion Laboratory, Pasadena CA. 76 pp. https://nsidc.org/sites/nsidc.org/files/files/271_L4_C_RevA_web.pdf, 2.7 MB
Kimball, J. et al. 2015. Soil Moisture Active Passive (SMAP) Project Assessment Report for the Beta-Release L4_C Data Product. http://nsidc.org/data/docs/daac/smap/sp_l4_cmdl/pdfs/SMAP-Assessment_Report_L4_C_nocover.pdf
Kimball, J., L. A. Jones, J. P. Glassy, and R. Reichle. 2015. SMAP L4 Global Daily 9 km Carbon Net Ecosystem Exchange. Version 1. [indicate subset used]. Boulder, Colorado USA: NASA National Snow and Ice Data Center Distributed Active Archive Center. http://dx.doi.org/10.5067/22TFAUSNLO9R.
