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Description

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.

Version Description

Changes to this version include: (1) Transitioned to Validated-Stage 2. (2) Using SPL4SMAU V2 Validated and SPL4SMGP V2 Validated data as input. (3) Update to process radiometer data from 2015-03-31 to 2015-04-12. (4) Some data fields renamed from *_av to *_mean. (5) Updated to have continuous RMSE-based "quality" fields instead of the categorical quality flag in V1.

Product Summary

Platforms
Aqua ,
SMAP ,
Suomi-NPP ,
Terra
Instruments
MODIS ,
SMAP L-BAND RADAR ,
VIIRS
Spatial Extent

N: 85.044 S: -85.044 E: 180 W: -180

Spatial Resolution
9 Kilometers x 9 Kilometers
Location
GLOBAL LAND
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2015-03-31 to 2017-07-11
Temporal Resolution
1 Day
Concept ID
C4114258680-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
4
Published
Updated
Science Keywords
Gross Primary Production (gpp) ,
Heterotrophic Respiration (rh) ,
NET ECOSYSTEM CO2 EXCHANGE (NEE) ,
Soil Organic Carbon (SOC)

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

Kimball, J., Jones, L., Glassy, J., & Reichle, R. (2016). SMAP L4 Global Daily 9 km Carbon Net Ecosystem Exchange, Version 2 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/UBKO5ZUI7I5V Date Accessed: 2026-06-20

Documents

Publications Citing This Dataset

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Title Year Author Topic
An Interpretable Machine Learning Framework for Unraveling the Dynamics of Surface Soil Moisture Drivers Nikraftar, Zahir, Parizi, Esmaeel, Saber, Mohsen, Boueshagh, Mahboubeh, Tavakoli, Mortaza, Esmaeili Mahmoudabadi, Abazar, Ekradi, Mohammad Hassan, Mbuvha, Rendani, Hosseini, Seiyed Mossa Soil Organic Carbon (SOC), Gross Primary Production (gpp), Heterotrophic Respiration (rh), NET ECOSYSTEM CO2 EXCHANGE (NEE)
Decoding the spatiotemporal complexities of the permafrost carbon feedback with multimodal ensemble learning Gay, B. A., Pastick, N. J., Watts, J. D., Armstrong, A. H., Miner, K. R., Miller, C. E. Respiration Rate, Biogeochemical Cycles, Primary Production, Gross Primary Production (gpp), Heterotrophic Respiration (rh), NET ECOSYSTEM CO2 EXCHANGE (NEE), Soil Organic Carbon (SOC)
Carbon uptake in Eurasian boreal forests dominates the highlatitude net ecosystem carbon budget Watts, Jennifer D., Farina, Mary, Kimball, John S., Schiferl, Luke D., Liu, Zhihua, Arndt, Kyle A., Zona, Donatella, Ballantyne, Ashley, Euskirchen, Eugenie S., Parmentier, FransJan W., Helbig, Manuel, Sonnentag, Oliver, Tagesson, Torbern, Rinne, Janne, Ikawa, Hiroki, Ueyama, Masahito, Kobayashi, Hideki, Sachs, Torsten, Nadeau, Daniel F., Kochendorfer, John, JackowiczKorczynski, Marcin, Virkkala, Anna, Aurela, Mika, Commane, Roisin, Byrne, Brendan, Birch, Leah, Johnson, Matthew S., Madani, Nima, Rogers, Brendan, Du, Jinyang, Endsley, Arthur, Savage, Kathleen, Poulter, Ben, Zhang, Zhen, Bruhwiler, Lori M., Miller, Charles E., Goetz, Scott, Oechel, Walter C. Leaf Characteristics, Photosynthetically Active Radiation, Leaf Area Index (LAI), Fraction Of Absorbed Photosynthetically Active Radiation (fapar), Permafrost, Soil Classification, Soil Temperature, Vegetation Cover, Soil Moisture/Water Content, Soil Respiration, Respiration Rate, Biogeochemical Cycles, Primary Production, Aquatic Ecosystems, Terrestrial Ecosystems, Vegetation, Soils, Gross Primary Production (gpp), Heterotrophic Respiration (rh), NET ECOSYSTEM CO2 EXCHANGE (NEE), Soil Organic Carbon (SOC)
SMAP L4 assessment of the US northern plains 2017 flash drought Kimball, J. S., Jones, L., Jensco, K., He, M., Maneta, M., Reichle, R. Surface Soil Moisture, Gross Primary Production (gpp), Heterotrophic Respiration (rh), NET ECOSYSTEM CO2 EXCHANGE (NEE), Soil Organic Carbon (SOC)
Global Analysis of Bioclimatic Controls on Ecosystem Productivity Using Madani, Nima, Kimball, John, Jones, Lucas, Parazoo, Nicholas, Guan, Kaiyu Gross Primary Production (gpp), Heterotrophic Respiration (rh), NET ECOSYSTEM CO2 EXCHANGE (NEE), Soil Organic Carbon (SOC)
Monitoring ecosystem-atmosphere co2 exchange respose to recent (20152016) climate variability using the smap l4 carbon product Kimball, J. S., Jones, L. A., Glassy, J., Madani, N., Reichle, R. H. Gross Primary Production (gpp), Heterotrophic Respiration (rh), NET ECOSYSTEM CO2 EXCHANGE (NEE), Soil Organic Carbon (SOC)
The SMAP Level 4 Carbon Product for Monitoring Ecosystem LandAtmosphere CO2 Exchange Jones, Lucas A., Kimball, John S., Reichle, Rolf H., Madani, Nima, Glassy, Joe, Ardizzone, Joe V., Colliander, Andreas, Cleverly, James, Desai, Ankur R., Eamus, Derek, Euskirchen, Eugenie S., Hutley, Lindsay, Macfarlane, Craig, Scott, Russell L. Carbon, Nitrogen, Soil Water Holding Capacity, Soil Bulk Density, Soil Chemistry, Soil Classification, Soil Moisture/Water Content, Soil Horizons/Profile, Soil Depth, Soil Porosity, Soil Texture, Terrain Elevation, Root Zone Soil Moisture, Surface Soil Moisture, Gross Primary Production (gpp), Heterotrophic Respiration (rh), NET ECOSYSTEM CO2 EXCHANGE (NEE), Soil Organic Carbon (SOC)
The SMAP level 4 carbon product for monitoring terrestrial ecosystem-atmosphere CO2 exchange Jones, L. A., Kimball, J. S., Madani, N., Reichle, R. H., Glassy, J., Ardizzone, J. Carbon, Nitrogen, Soil Water Holding Capacity, Soil Bulk Density, Soil Chemistry, Soil Classification, Soil Moisture/Water Content, Soil Horizons/Profile, Root Zone Soil Moisture, Surface Soil Moisture, Gross Primary Production (gpp), Heterotrophic Respiration (rh), NET ECOSYSTEM CO2 EXCHANGE (NEE), Soil Organic Carbon (SOC)
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