• Anderson, M. C., , Neale C. M. U. , , Li F. , , Norman J. M. , , Kustas W. P. , , Jayanthi H. , , and Chavez J. , 2004: Upscaling ground observations of vegetation water content, canopy height, and leaf area index during SMEX02 using aircraft and Landsat imagery. Remote Sens. Environ., 92 , 447464.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Baldocchi, D. D., 1988: Measuring biosphere-atmosphere exchanges of biologically related gases with micrometeorological methods. Ecology, 69 , 13311340.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Byre, K. R., , Norman J. M. , , Bundy L. G. , , and Grower S. T. , 2000: Water-budget evaluation of prairie and corn ecosystems. Soil Sci. Soc. Amer. J., 64 , 715724.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Cosh, M. H., , Jackson T. J. , , Bindlish R. , , and Prueger J. H. , 2004: Watershed scale temporal and spatial stability of soil moisture and its role in validating satellite estimates. Remote Sens. Environ., 92 , 427435.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Hatfield, J. L., , Jaynes D. B. , , Burkart M. R. , , Cambardella C. A. , , Moorman T. B. , , Prueger J. H. , , and Smith M. A. , 1999: Water quality in Walnut Creek Watershed: Setting and farming practices. J. Environ. Qual., 28 , 1124.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Kustas, W. P., , Hatfield J. L. , , and Prueger J. H. , 2005: The Soil Moisture–Atmosphere Coupling Experiment (SMACEX): Background, hydrometeorlogical conditions, and preliminary findings. J. Hydrometeor., 6 , 791804.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Leach, B. W., , and MacPherson J. I. , 1991: An application of Kalman filtering to airborne wind measurement. J. Atmos. Oceanic Technol., 8 , 5165.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • MacPherson, J. I., , and Wolde M. , 2002: NRC twin otter operations in the soil moisture- atmosphere coupling experiment (SMACEX). National Research Council of Canada Laboratory Tech. Rep. LTR-FR-190, 26 pp.

  • MacPherson, J. I., , and Bastian M. , 2003: Archive of NRC Twin Otter data from the 1991-2003 flux projects. National Research Council of Canada Laboratory Tech. Rep. LTR, FR-204, 50 pp.

  • Meek, D. W., , Prueger J. H. , , Kustas W. P. , , and Hatfield J. L. , 2005: Determining meaningful differences for SMACEX eddy covariance measurements. J. Hydrometeor., 6 , 812824.

    • Search Google Scholar
    • Export Citation
  • Meyers, T. P., , and Hollinger S. E. , 2004: An assessment of storage terms in the surface energy balance of corn and soybean. Agric. For. Meteor., 125 , 105115.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Prueger, J. H., , Hatfield J. L. , , Parkin T. B. , , Kustas W. P. , , and Kaspar T. C. , 2004: Carbon dioxide dynamics during a growing season in Midwestern cropping systems. Environ. Manage., 33 , (Suppl. 1). S330S343.

    • Search Google Scholar
    • Export Citation
  • Webb, E. K., , Pearman G. I. , , and Leuning R. , 1980: Correction of flux measurements for density effects due to heat and water vapor transfer. Quart. J. Roy. Meteor. Soc., 106 , 85100.

    • Crossref
    • Search Google Scholar
    • Export Citation
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Tower and Aircraft Eddy Covariance Measurements of Water Vapor, Energy, and Carbon Dioxide Fluxes during SMACEX

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  • 1 National Soil Tilth Laboratory, ARS, USDA, Ames, Iowa
  • | 2 Hydrology and Remote Sensing Laboratory, ARS, USDA, Beltsville, Maryland
  • | 3 Utah State University, Logan, Utah
  • | 4 NRC Institute for Aerospace Research, Ottawa, Ontario, Canada
  • | 5 University of Iowa, Iowa City, Iowa
  • | 6 Los Alamos National Laboratory, Los Alamos, New Mexico
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Abstract

A network of eddy covariance (EC) and micrometeorological flux (METFLUX) stations over corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] canopies was established as part of the Soil Moisture–Atmosphere Coupling Experiment (SMACEX) in central Iowa during the summer of 2002 to measure fluxes of heat, water vapor, and carbon dioxide (CO2) during the growing season. Additionally, EC measurements of water vapor and CO2 fluxes from an aircraft platform complemented the tower-based measurements. Sensible heat, water vapor, and CO2 fluxes showed the greatest spatial and temporal variability during the early crop growth stage. Differences in all of the energy balance components were detectable between corn and soybean as well as within similar crops throughout the study period. Tower network–averaged fluxes of sensible heat, water vapor, and CO2 were observed to be in good agreement with area-averaged aircraft flux measurements.

Corresponding author address: J. H. Prueger, USDA-ARS, National Soil Tilth Laboratory, Ames, IA 50011. Email: prueger@nstl.gov

Abstract

A network of eddy covariance (EC) and micrometeorological flux (METFLUX) stations over corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] canopies was established as part of the Soil Moisture–Atmosphere Coupling Experiment (SMACEX) in central Iowa during the summer of 2002 to measure fluxes of heat, water vapor, and carbon dioxide (CO2) during the growing season. Additionally, EC measurements of water vapor and CO2 fluxes from an aircraft platform complemented the tower-based measurements. Sensible heat, water vapor, and CO2 fluxes showed the greatest spatial and temporal variability during the early crop growth stage. Differences in all of the energy balance components were detectable between corn and soybean as well as within similar crops throughout the study period. Tower network–averaged fluxes of sensible heat, water vapor, and CO2 were observed to be in good agreement with area-averaged aircraft flux measurements.

Corresponding author address: J. H. Prueger, USDA-ARS, National Soil Tilth Laboratory, Ames, IA 50011. Email: prueger@nstl.gov

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