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Tower_team:
PI: Russell Scott russ.scott@ars.usda.gov - United States Department of Agriculture
Lat, Long: 31.8214, -110.8661
Elevation(m): 1120
Network Affiliations: AmeriFlux
Vegetation IGBP: WSA (Woody Savannas)
Climate Koeppen: Bsk (Steppe: warm winter)
Mean Annual Temp (°C): 17.92
Mean Annual Precip. (mm): 380
Flux Species Measured: CO2, H2O
Years Data Collected: AmeriFlux: 2004 - Present
Description: Semidesert grassland encroached by mesquite (Prosopis velutina) trees. Please see Scott et al. 2009 JGR-Biogeo, 114, G04004
URL: http://ag.arizona.edu/SRER/
Research Topics:
Long-term water, carbon and energy flux measurements (eddy covariance). Determining how woody plant encroachment affects water and carbon cycling. Comparing ...
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Acknowledgment:
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Site Publication More Site Publications
Scott, R.L., Biederman, J.A., Hamerlynck, E.P., Barron-Gafford, G. 2015. The carbon balance pivot point of southwestern U.S. semiarid ecosystems: Insights from the 21st century drought, Journal of Geophysical Research: Biogeosciences, 120, 2612-2624.

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.

Year Range
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MODIS NDVI

Normalized Difference Vegetation Index image for this site.

For time series, data download and other MODIS products for this site, visit MODIS cutouts.

Citation

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Citation:

ORNL DAAC. 2008. MODIS Collection 5 Fixed Sites Subsetting and Visualization Tool. ORNL DAAC, Oak Ridge, Tennessee, USA. http://dx.doi.org/10.3334/ORNLDAAC/1251

Read more on how to cite these MODIS images. 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.

Year Publication
2015 Dennis Baldocchi, Cove Sturtevant (2015) Does day and night sampling reduce spurious correlation between canopy photosynthesis and ecosystem respiration?, Agricultural and Forest Meteorology, 207, 117-126.
2009 Potts, D. L., Scott, R. L., Bayram, S., Carbonara, J. (2009) Woody Plants Modulate The Temporal Dynamics Of Soil Moisture In A Semi-Arid Mesquite Savanna, Ecohydrology, 3(1), 20-27.
2010 Scott, R. L. (2010) Using Watershed Water Balance To Evaluate The Accuracy Of Eddy Covariance Evaporation Measurements For Three Semiarid Ecosystems, Agricultural And Forest Meteorology, 150(2), 219-225.
2011 Barron-Gafford, G.A., Scott, R.L., Jenerette, G.D., Huxman, T.E. (2011) The Relative Controls Of Temperature, Soil Moisture, And Plant Functional Group On Soil CO2 Efflux At Diel, Seasonal, And Annual Scales, Journal Of Geophysical Research, 116(G1), n/a-n/a.
2009 Scott, R.L., Jenerette, G.D., Potts, D.L., Huxman, T.E. (2009) Effects Of Seasonal Drought On Net Carbon Dioxide Exchange From A Woody-Plant-Encroached Semiarid Grassland, Journal Of Geophysical Research: Biogeosciences, 114(G4), n/a-n/a.
2013 Barron-Gafford, G. A., Scott, R. L., Jenerette, G. D., Hamerlynck, E. P., Huxman, T. E. (2013) Landscape And Environmental Controls Over Leaf And Ecosystem Carbon Dioxide Fluxes Under Woody Plant Expansion, Journal Of Ecology, 101(6), 1471-1483.
2008 Scott, R. L., Cable, W. L., Hultine, K. R. (2008) The Ecohydrologic Significance Of Hydraulic Redistribution In A Semiarid Savanna, Water Resources Research, 44(W02440), n/a-n/a.
2012 Hamerlynck, E. P., Scott, R. L., Barron-Gafford, G. A., Cavanaugh, M. L., Susan Moran, M., Huxman, T. E. (2012) Cool-Season Whole-Plant Gas Exchange Of Exotic And Native Semiarid Bunchgrasses, Plant Ecology, 213(8), 1229-1239.
2015 Scott, R.L., Biederman, J.A., Hamerlynck, E.P., Barron-Gafford, G. (2015) The carbon balance pivot point of southwestern U.S. semiarid ecosystems: Insights from the 21st century drought, Journal of Geophysical Research: Biogeosciences, 120, 2612-2624.
2016 Wolf, S., Keenan, T.F., Fisher, J.B., Baldocchi, D.D., Desai, A.R., Richardson, A.D., Scott, R.L., Law, B.E., Litvak, M.E., Brunsell, N.A., Peters, W., van der Laan-Luijkx, I.T. (2016) Warm spring reduced carbon cycle impact of the 2012 US summer drought, Proceedings of the National Academy of Sciences, 113(21), 5880-5885.

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: 862m x 862m
  • 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