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NACP Site: Tower Meteorology, Flux Observations with Uncertainty, and Ancillary Data


DatasetNACP Site: Tower Meteorology, Flux Observations with Uncertainty, and Ancillary Data
Release date2013-08-09
Time period1991-01-01 to 2007-12-31

Usage Metrics

CountEarliest DateLatest DateData Usage
Citations1720102017Publications citing this dataset
Downloads1622013-08-212017-11-175155 total files downloaded


This data set contains meteorological, carbon cycle flux, phenology, and ancillary data measured at 47 eddy covariance flux tower sites across North America. The data were used by North American Carbon Program (NACP) Site-Level Synthesis as model driver data and for assessing how well 24 Terrestrial Biosphere Models simulated carbon processes across vegetation types and environmental conditions. *The meteorology data include eight variables: air temperature (K), specific humidity (kg/kg), wind speed (m/s), precipitation (kg/m2/s), surface pressure (Pa), surface incident shortwave radiation (W/m2), surface incident longwave radiation (W/m2), and CO2 concentration (ppm). Gap-filled data were used by modeling teams as input model driver data. *Measured fluxes of net ecosystem exchange (NEE) and derived gross primary productivity (GPP) and respiration (R) and respective calculated uncertainty estimates are provided for each tower site at the native time resolution of the observations (30 or 60-minute) as well as the diurnal, seasonal, and annual time scales. The data were gap-filled following a standard protocol. Components of uncertainty include uncertainties resulting from turbulence, gap-filling, flux partitioning, and u* threshold determination. Flux observations and uncertainty data were used to assess how well models simulated carbon processes. *Remotely sensed NDVI, LAI, and fPAR phenology data were derived from the GIMMS version g NDVI data set for each flux tower site. Phenology data were used by some modeling teams as input model driver data. *Ancillary data and information describe tower location and physical characteristics, disturbance history, and biological and ecological attributes of the vegetation, litter, and soil. These ancillary data were used by modeling teams as input model driver data. The data files are in both ASCII text and NetCDF formats (ALMA standard). The compilation of these data was facilitated by the NACP Modeling and Synthesis Thematic Data Center (MAST-DC).

Dataset documentation


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Crosscite Citation Formatter
Barr, A.G., D.M. Ricciuto, K. Schaefer, A. Richardson, D. Agarwal, P.E. Thornton, K.J. Davis, R.B. Cook, D.Y. Hollinger, C. van Ingen, B. Amiro, A.E. Andrews, M.A. Arain, D. Baldocchi, T.A. Black, P. Bolstad, P. Curtis, A. Desai, D. Dragoni, L. Flanagan, L. Gu, G. Katul, B.E. Law, P.M. Lafleur, H. Margolis, R. Matamala, T. Meyers, J.H. McCaughey, R. Monson, J.W. Munger, W. Oechel, R. Oren, N.T. Roulet, M. Torn, and S.B. Verma. 2013. NACP Site: Tower Meteorology, Flux Observations with Uncertainty, and Ancillary Data. ORNL DAAC, Oak Ridge, Tennessee, USA.

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Data Files

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Data File (Granule)File SizeDatesLatitudeLongitude 4.4MB 2003-01-01 to 2007-12-31 42.66N80.56W 4.4MB 2001-01-01 to 2006-12-31 41.18N96.44W 4.5MB 2001-01-01 to 2006-12-31 41.17N96.48W 11.7MB 2001-01-01 to 2007-12-31 38.43N120.97W 19.1MB 1997-01-01 to 2006-12-31 53.63N106.20W 5.4MB 2004-01-01 to 2007-12-31 38.74N92.20W 4.1MB 2004-01-01 to 2005-12-31 53.88N104.64W 3.2MB 2005-01-01 to 2007-12-31 41.86N88.22W 4.4MB 2003-01-01 to 2007-12-31 42.77N80.46W 7.6MB 2002-01-01 to 2005-12-31 53.91N104.66W 10.8MB 1994-01-01 to 2006-12-31 55.88N98.48W 5.5MB 2004-01-01 to 2006-12-31 49.69N74.34W 2.8MB 2003-01-01 to 2005-12-31 35.97N79.10W 9.7MB 2002-01-01 to 2006-12-31 49.53N124.90W 7.3MB 2003-01-01 to 2006-12-31 53.94N104.65W 3.9MB 2001-01-01 to 2006-12-31 41.16N96.47W 8.6MB 1995-01-01 to 2005-12-31 45.95N90.27W 4.4MB 2003-01-01 to 2007-12-31 42.71N80.35W 10.3MB 2002-01-01 to 2007-12-31 42.71N80.36W 9.0MB 2002-01-01 to 2007-12-31 44.45N121.56W 13.5MB 2000-01-01 to 2006-12-31 53.92N104.69W 6.3MB 1999-01-01 to 2002-12-31 44.44N121.57W 17.6MB 1998-01-01 to 2007-12-31 40.03N105.55W 3.9MB 2004-01-01 to 2005-12-31 44.32N121.61W 7.7MB 1999-01-01 to 2006-12-31 39.32N86.41W 17.3MB 1998-01-01 to 2006-12-31 49.87N125.33W 13.4MB 2000-01-01 to 2006-12-31 53.99N105.12W 10.7MB 2001-01-01 to 2006-12-31 46.24N89.35W 13.6MB 2000-01-01 to 2007-12-31 36.60N97.49W 6.5MB 1999-01-01 to 2006-12-31 70.47N157.41W 5.6MB 2004-01-01 to 2006-12-31 48.22N82.16W 8.1MB 1998-01-01 to 2006-12-31 45.56N84.71W 15.7MB 1998-01-01 to 2006-12-31 33.37N116.62W 4.7MB 2004-01-01 to 2007-12-31 41.84N88.24W 13.4MB 2001-01-01 to 2007-12-31 38.41N120.95W 14.9MB 1998-01-01 to 2006-12-31 45.81N90.08W 7.8MB 1998-01-01 to 2006-12-31 71.32N156.63W 4.6MB 1996-01-01 to 2000-12-31 44.50N121.62W 14.1MB 1999-01-01 to 2006-12-31 45.41N75.52W 14.4MB 1998-01-01 to 2005-12-31 35.98N79.09W 4.9MB 1997-01-01 to 2000-12-31 36.93N96.68W 18.3MB 1996-01-01 to 2004-12-31 45.20N68.74W 7.3MB 2003-01-01 to 2007-12-31 54.95N112.47W 19.7MB 1997-01-01 to 2006-12-31 49.71N112.94W 12.1MB 2000-01-01 to 2006-12-31 46.08N89.98W 14.1MB 1991-01-01 to 2006-12-31 42.54N72.17W 11.4MB 2001-01-01 to 2006-12-31 49.87N125.29W

Companion Files

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Dataset has 11 companion files.

  • NACP_Site_Tower_Met_and_Flux.pdf
  • Site_information_basic.csv
  • Site_location_summary.csv
  • NAPC_sites_ungrouped_with-label.png
  • phenology_readme.txt
  • site_synthesis_protocol_v7.pdf
  • Soil_texture_summary.csv
  • NACP_uncertainty_analysis.pdf
  • site_information_extended.pdf
  • site_synthesis_documentation.pdf
  • Richardson_gap_filling_2009.pdf