Tower_team:
PI:	Brian Viner brian.viner@srnl.doe.gov - Savannah River National Laboratory
Lat, Long:	33.3825, -81.5653
Elevation(m):	93
Network Affiliations:	AmeriFlux
Vegetation IGBP:	MF (Mixed Forests: Lands dominated by trees with a percent cover >60% and height exceeding 2 meters. Consists of tree communities with interspersed mixtures or mosaics of the other four forest types. None of the forest types exceeds 60% of landscape.)
Climate Koeppen:	—
Mean Annual Temp (°C):	—
Mean Annual Precip. (mm):	—
Flux Species Measured:	H2O, CO2
Years Data Collected:	2011 - 2021
Years Data Available:	AmeriFlux BASE 2011 - 2022 Data Citation AmeriFlux FLUXNET 2011 - 2022 Data Citation
Data Use Policy:	AmeriFlux CC-BY-4.0 Policy¹
Description:	The site is characterized by a mix of pine and deciduous hardwood forests with a general canopy height of 25m which was established in the 1950s. Management ... The site is characterized by a mix of pine and deciduous hardwood forests with a general canopy height of 25m which was established in the 1950s. Management of the forest around the site is performed by the USFS-Savannah River and consists of prescribed burning of the understory on a 3-4 year cycle. See More Show Less
URL:	https://srnl.doe.gov/atg/index.html
Research Topics:	Forest Management; Understory Changes; Carbon Sequestration
Acknowledgment:	—

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US-Akn

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Image Credit: www.srnl.gov www.srnl.gov, 2022
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DOI(s) for citing US-Akn data

Data Use Policy: AmeriFlux CC-BY-4.0 License

This site’s data can also be used under the more restrictive AmeriFlux Legacy Policy.
The AmeriFlux Legacy Policy must be followed if US-Akn data are combined with data from sites that require the AmeriFlux Legacy Policy.

AmeriFlux BASE: https://doi.org/10.17190/AMF/1246141
Citation: Monique Leclerc (2023), AmeriFlux BASE US-Akn Savannah River Site, Ver. 6-5, AmeriFlux AMP, (Dataset). https://doi.org/10.17190/AMF/1246141
AmeriFlux FLUXNET: https://doi.org/10.17190/AMF/2469442
Citation: Monique Leclerc (2024), AmeriFlux FLUXNET-1F US-Akn Savannah River Site, Ver. 3-6, AmeriFlux AMP, (Dataset). https://doi.org/10.17190/AMF/2469442

Find global FLUXNET datasets, like FLUXNET2015 and FLUXNET-CH4, and their citation information at fluxnet.org.

To cite BADM when downloaded on their own, use the publications below for citing site characterization. When using BADM that are downloaded with AmeriFlux BASE and AmeriFlux FLUXNET products, use the DOI citation for the associated data product.

Publication(s) for citing site characterization

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Acknowledgments

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Resources

AmeriFlux Logos & Acknowledgments

This page displays the list of downloads of data for the site US-Akn.

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US-Akn
**Description:**
US-Akn Savannah River National Laboratory (SRNL) Carbon Flux Super Site (www.srnl.gov)
Keywords: Carbon Flux Super Site
**Credit:** www.srnl.gov www.srnl.gov
**Site ID:** US-Akn
**Location:** North Carolina, United States
**Image Date:** 2022
**Journal:** —
**Article Title:** —
**Copyright Permissions:** www.srnl.gov
**Right to Use:** Request for permission

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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. Terrestrial Ecology Subsetting & Visualization Services (TESViS) Fixed Sites Subsets. 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.

PhenoCam Images and Derived Time Series Data

PhenoCams are high-resolution digital cameras that take repeated images of studied ecosystems and provide quantitative information about the canopy phenology. The PhenoCam Network coordinates the camera installation and data reporting/analyses across sites in the Americas, providing automated, near-surface remote sensing of canopy phenology across a range of ecosystems and climate zones. Use of PhenoCam images / data should follow the PhenoCam Data Use Policy .

No PhenoCam data for this site

GeoNEX Data Products

GeoNEX led by NASA Earth eXchange (NEX) is a collaborative effort for generating Earth monitoring products from the new generation of geostationary satellite sensors. GeoNEX has produced a suite of geostationary data products including surface reflectance, land surface temperature, surface solar radiation, and many others.

The GeoNEX Common Grid locates GeoNEX data in the geographic (latitude/longitude) projection. Pixels (grid cells) are created at regular 0.005°, 0.01°, and 0.02° resolutions.

GeoNEX pixels below cover the area 0.06° x 0.06° around and including site US-Akn, 33.3825, -81.5653.

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Coordinates for selected GeoNEX Pixel

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NDVI: Normalized Difference Vegetation Index

No NDVI data have been received for site US-Akn.

NDVI (unitless)

Resolution: 0.01° x 0.01° & 10 minutes

Coordinates for pixel:

NIRv Near-Infrared Reflectance of vegetation

No NIRv data have been received for site US-Akn.

NIRv (unitless)

Resolution: 0.01° x 0.01° & 10 minutes

Coordinates for pixel:

DSR: Surface downward shortwave radiation

No DSR data have been received for site US-Akn.

Shortwave Radiation (W/m2)

Resolution: 0.01° x 0.01° & Hourly

Coordinates for pixel:

LST: Land Surface Temperature

No LST data have been received for site US-Akn.

LST (K)

Resolution: 0.02° x 0.02° & Hourly

Coordinates for pixel:

Citation

This material can be used without obtaining permission from NASA. NASA should be acknowledged as the source of this material.

Subset Data Citation:

Hashimoto, H., Wang, W., Park, T., Khajehei, S., Ichii, K., Michaelis, A.R., Guzman, A., Nemani, R.R., Torn, M., Yi, K., Brosnan, I.G. (in preparation). Subsets of geostationary satellite data over international observing network sites for studying the diurnal dynamics of energy, carbon, and water cycles.

Relevant Science Publication Citation:

GeoNEX Surface Reflectance for Vegetation Indices (NDVI & NIRv)

Wang, W., Wang, Y., Lyapustin, A., Hashimoto, H., Park, T., Michaelis, A., & Nemani, R. (2022). A novel atmospheric correction algorithm to exploit the diurnal variability in hypertemporal geostationary observations. Remote Sensing, 14(4), 964.

GeoNEX Surface Downward Solar Radiation (DSR):

Li, R., Wang, D., Wang, W., & Nemani, R. (2023). A GeoNEX-based high-spatiotemporal-resolution product of land surface downward shortwave radiation and photosynthetically active radiation. Earth System Science Data, 15(3), 1419-1436.

GeoNEX Land Surface Temperature (LST):

Jia, A., Liang, S., & Wang, D. (2022). Generating a 2-km, all-sky, hourly land surface temperature product from Advanced Baseline Imager data. Remote Sensing of Environment, 278, 113105.

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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.

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Wind Roses

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Image scale: 848m x 848m

Image scale: 1695m x 1695m

Data Collected: 2011 - 2013

Wind roses use variables ‘WS’ and ‘WD’.
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Wind Speed (m/s)

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About Ameriflux Wind Roses

Wind Rose Explanation

A 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

US-Akn: Savannah River Site

US-Akn: Savannah River Site

DOI(s) for citing US-Akn data

Publication(s) for citing site characterization

Acknowledgments

Resources

US-Akn: Savannah River Site

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US-Akn: Savannah River Site

US-Akn

US-Akn: Savannah River Site

US-Akn: Savannah River Site

BADM for This Site

US-Akn: Savannah River Site

Wind Roses

Wind Speed (m/s)

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