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Tower_team:
PI: John Baker john.baker@ars.usda.gov - USDA-ARS
PI: Timothy Griffis tgriffis@umn.edu - University of Minnesota
DataManager: Cody Winker cdwinker@umn.edu - USDA-ARS
Technician: Bill Breiter wbreiter@umn.edu -
Lat, Long: 44.7143, -93.0898
Elevation(m): 290
Network Affiliations: AmeriFlux, Phenocam
Vegetation IGBP: CRO (Croplands: Lands covered with temporary crops followed by harvest and a bare soil period (e.g., single and multiple cropping systems). Note that perennial woody crops will be classified as the appropriate forest or shrub land cover type.)
Climate Koeppen: Dfa (Humid Continental: humid with severe winter, no dry season, hot summer)
Mean Annual Temp (°C): 6.4
Mean Annual Precip. (mm): 879
Flux Species Measured: CO2, H, H2O, Other
Years Data Collected: AmeriFlux: 2003 - 2017
Description:
This tower is located in a farm field farmed in accordance with the dominant farming practice in the region: a corn/soybean rotation with chisel plow tillage ...
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URL: http://www.biometeorology.umn.edu/
Research Topics:
Quantify the seasonal and interannual variation of net ecosystem CO2 exchange (FN) of agricultural ecosystems in the Upper Midwest grown under different ...
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Acknowledgment:
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Instructions for DOIs for This Site

When using DOIs for this site, use the publications and acknowledgments listed below.

DOIs

Publications to use for Citations for this Site

Acknowledgements

Resources

This page displays the list of downloads of data for the site {{siteId}}.

NOTE: Version refers to the version of the AmeriFlux BASE-BADM product for the site was downloaded by the user and the download count indicates the number of times the person downloaded that version. The download count indicates the number of times the person downloaded the data.

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MODIS NDVI

The time series shows the 16-day Normalized Difference Vegetation Index (NDVI) average from the MOD13Q1 data product.
Use the slider below the time series to zoom in and out.

Includes all pixels that have acceptable quality

To view / download these data and other MOD13Q1 products for this site, visit MODIS/Terra Vegetation Indices.

For other related products, visit MODIS/VIIRS Fixed Sites Subsets Tool.

Citation:

ORNL DAAC. 2018. MODIS and VIIRS Land Products Fixed Sites Subsetting and Visualization Tool. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1567

Read more on how to cite these MODIS products. Data come from NASA’s MODIS instruments installed on satellites Terra and Aqua, which scan the entire Earth’s surface every one to two days.

MODIS NDVI subsetted data is not yet available for this site.

For a complete list of AmeriFlux sites, visit ORNL DAAC's MODIS/VIIRS Fixed Sites Subsets Tool.

Year Publication
2012 Ruehr, N. K., Martin, J. G., Law, B. E. (2012) Effects Of Water Availability On Carbon And Water Exchange In A Young Ponderosa Pine Forest: Above- And Belowground Responses, Agricultural And Forest Meteorology, 164, 136-148.
2017 Euskirchen, E. S., Bret-Harte, M. S., Shaver, G. R., Edgar, C. W., Romanovsky, V. E. (2017) Long-Term Release Of Carbon Dioxide From Arctic Tundra Ecosystems In Alaska, Ecosystems, 20(5), 960-974.
2018 Chu, H., Baldocchi, D. D., Poindexter, C., Abraha, M., Desai, A. R., Bohrer, G., Arain, M. A., Griffis, T., Blanken, P. D., O'Halloran, T. L., Thomas, R. Q., Zhang, Q., Burns, S. P., Frank, J. M., Christian, D., Brown, S., Black, T. A., Gough, C. M., Law, B. E., Lee, X., Chen, J., Reed, D. E., Massman, W. J., Clark, K., Hatfield, J., Prueger, J., Bracho, R., Baker, J. M., Martin, T. A. (2018) Temporal Dynamics Of Aerodynamic Canopy Height Derived From Eddy Covariance Momentum Flux Data Across North American Flux Networks, Geophysical Research Letters, 45, 9275–9287.
2005 Griffis, T., Baker, J., Zhang, J. (2005) Seasonal Dynamics And Partitioning Of Isotopic CO2 Exchange In A C3/C4 Managed Ecosystem, Agricultural And Forest Meteorology, 132(1-2), 1-19.
2008 Griffis, T.J., Sargent, S.D., Baker, J.M., Lee, X., Tanner, B.D., Greene, J., Swiatek, E., Billmark, K. (2008) Direct Measurement Of Biosphere-Atmosphere Isotopic Co2exchange Using The Eddy Covariance Technique, Journal Of Geophysical Research, 113(D8), n/a-n/a.
2011 Griffis, T.J., Lee, X., Baker, J.M., Billmark, K., Erickson, N. Schultz,M., Zhang, X., Fassbinder, J., Xiao, W., Hu, N. (2011) Oxygen Isotope Composition Of Evapotranspiration And Its Relation To C4 Photosynthetic Discrimination, Journal Of Geophysical Research: Biogeosciences, 116(G1), n/a-n/a.
2010 Griffis, T. J., Sargent, S. D., Lee, X., Baker, J. M., Greene, J., Erickson, M., Zhang, X., Billmark, K., Schultz, N., Xiao, W., Hu, N. (2010) Determining The Oxygen Isotope Composition Of Evapotranspiration Using Eddy Covariance, Boundary-Layer Meteorology, 137(2), 307-326.
2010 Griffis, T. J., Baker, J. M., Sargent, S. D., Erickson, M., Corcoran, J., Chen, M., Billmark, K. (2010) Influence Of C4 Vegetation On 13CO2 Discrimination And Isoforcing In The Upper Midwest, United States, Global Biogeochemical Cycles, 24(4), n/a-n/a.
2009 Bavin, T., Griffis, T., Baker, J., Venterea, R. (2009) Impact Of Reduced Tillage And Cover Cropping On The Greenhouse Gas Budget Of A Maize/Soybean Rotation Ecosystem, Agriculture, Ecosystems & Environment, 134(3-4), 234-242.
2012 Fassbinder, J. J., Griffis, T. J., Baker, J. M. (2012) Interannual, Seasonal, And Diel Variability In The Carbon Isotope Composition Of Respiration In A C3/C4 Agricultural Ecosystem, Agricultural And Forest Meteorology, 153, 144-153.
2005 Baker, J., Griffis, T. (2005) Examining Strategies To Improve The Carbon Balance Of Corn/Soybean Agriculture Using Eddy Covariance And Mass Balance Techniques, Agricultural And Forest Meteorology, 128(3-4), 163-177.

BADM for This Site

Access the Biological, Ancillary, Disturbance and Metadata (BADM) information and data for this site.

BADM contain information for many uses, such as characterizing a site’s vegetation and soil, describing disturbance history, and defining instrumentation for flux processing. They complement the flux/met data.

* Online updates are shown on the Overview tab real time. However, downloaded BADM files will not reflect those updates until they have been reviewed for QA/QC.

Wind Roses

Click an image below to enlarge it, or use the navigation panel.
  • Image scale: 721m x 721m
  • Data Collected:
  • Wind roses use variables ‘WS’ and ‘WD’.
    Download Data Download Wind Rose as Image File (PNG)

    Wind Speed (m/s)

  • Graph Type
  • Wind Speed Scale
  • Wind Direction Scale (%)
  • Show Satellite Image
  • Show Wind Rose
  • Annual Average
    About Ameriflux Wind Roses
    Wind Rose Explanation
    wind rose gives a succinct view of how wind speed and direction are typically distributed at a particular location. Presented in a circular format, a wind rose shows the frequency and intensity of winds blowing from particular directions. The length of each “spoke” around the circle indicates the amount of time (frequency) that the wind blows from a particular direction. Colors along the spokes indicate categories of wind speed (intensity). Each concentric circle represents a different frequency, emanating from zero at the center to increasing frequencies at the outer circles
    Utility
    This information can be useful to gain insight into regions surrounding a flux tower that contribute to the measured fluxes, and how those regions change in dependence of the time of day and season. The wind roses presented here are for four periods of the year, and in 16 cardinal directions. Graphics are available for all sites in the AmeriFlux network based on reported wind measurements at each site.
    Data from each site can be downloaded by clicking the ‘download’ button.
    Hover the cursor over a wind rose to obtain directions, speeds and intensities.
    Note that wind roses are not equivalent to flux footprints. Specifically, the term flux footprint describes an upwind area “seen” by the instruments measuring vertical turbulent fluxes, such that heat, water, gas and momentum transport generated in this area is registered by the instruments. Wind roses, on the other hand, identify only the direction and speed of wind.
    Where do these data come from?
    The wind roses are based on observed hourly data from the sites registered with the AmeriFlux Network.
    Parameters for AmeriFlux Wind Roses
    To use wind roses for a single AmeriFlux site, the following parameters may be most useful:
    • Wind Speed Scale: Per Site
    • Wind Direction Scale (%): Per Site
    To compare wind roses from more than one single AmeriFlux site, the following parameters may be most useful:
    • Wind Speed Scale: Non-Linear
    • Wind Direction Scale (%): AmeriFlux
    Mar - Jun; 6am - 6pm
    Mar - Jun; 6pm - 6am
    Jun - Sep; 6am - 6pm
    Jun - Sep; 6pm - 6am
    Sep - Dec; 6am - 6pm
    Sep - Dec; 6pm - 6am
    Dec - Mar; 6am - 6pm
    Dec - Mar; 6pm - 6am