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The SMAP Level 4 Carbon PRODUCT for Monitoring Terrestrial Ecosystem-Atmosphere CO2 ExchangeThe NASA Soil Moisture Active Passive (SMAP) mission Level 4 Carbon (L4_C) product provides model estimates of Net Ecosystem CO2 exchange (NEE) incorporating SMAP soil moisture information as a primary driver. The L4_C product provides NEE, computed as total respiration less gross photosynthesis, at a daily time step and approximate 14-day latency posted to a 9-km global grid summarized by plant functional type. The L4_C product includes component carbon fluxes, surface soil organic carbon stocks, underlying environmental constraints, and detailed uncertainty metrics. The L4_C model is driven by the SMAP Level 4 Soil Moisture (L4_SM) data assimilation product, with additional inputs from the Goddard Earth Observing System, Version 5 (GEOS-5) weather analysis and Moderate Resolution Imaging Spectroradiometer (MODIS) satellite data. The L4_C data record extends from March 2015 to present with ongoing production. Initial comparisons against global CO2 eddy flux tower measurements, satellite Solar Induced Canopy Florescence (SIF) and other independent observation benchmarks show favorable L4_C performance and accuracy, capturing the dynamic biosphere response to recent weather anomalies and demonstrating the value of SMAP observations for monitoring of global terrestrial water and carbon cycle linkages.
Document ID
Document Type
Conference Paper
Jones, L. A. (Montana Univ. Missoula, MT, United States)
Kimball, J. S. (Montana Univ. Missoula, MT, United States)
Madani, N. (Montana Univ. Missoula, MT, United States)
Reichle, R. H. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Glassy, J. (Montana Univ. Missoula, MT, United States)
Ardizzone, J/ (Science Systems and Applications, Inc. Greenbelt, MD, United States)
Date Acquired
August 22, 2017
Publication Date
July 10, 2016
Subject Category
Geosciences (General)
Report/Patent Number
Meeting Information
2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)(Beijing)
Funding Number(s)
Distribution Limits
Public Use Permitted.

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