US-Uaf: University of Alaska, Fairbanks
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| Tower_team: | |
| PI: | Hiroki Iwata hiwata@shinshu-u.ac.jp - Shinshu University |
| PI: | Masahito Ueyama miyabi-flux@muh.biglobe.ne.jp - Osaka Metropolitan University |
| PI: | Yoshinobu Harazono harazono2009gl@gmail.com - Osaka Prefecture University |
| Technician: | Naoki Kukuu naokikukuu@hotmail.com - Wood River Field Services (Contractor) |
| Lat, Long: | 64.8663, -147.8555 |
| Elevation(m): | 155 |
| Network Affiliations: | AmeriFlux |
| Vegetation IGBP: | ENF (Evergreen Needleleaf Forests: Lands dominated by woody vegetation with a percent cover >60% and height exceeding 2 meters. Almost all trees remain green all year. Canopy is never without green foliage.) |
| Climate Koeppen: | Dwc (Subarctic: severe, dry winter, cool summer ) |
| Mean Annual Temp (°C): | -2.9 |
| Mean Annual Precip. (mm): | 263 |
| Flux Species Measured: | CO2, H, H2O, CH4 |
| Years Data Collected: | 2002 - Present |
| Years Data Available: | AmeriFlux BASE 2003 - 2024 Data Citation |
| Data Use Policy: | AmeriFlux CC-BY-4.0 Policy1 |
| Description: | This tower is located near Smith Lake, University of Alaska, Fairbanks. The open black spruce is dominated on discontinuous permafrost. |
| URL: | http://atmenv.envi.osakafu-u.ac.jp/data/uaf_data/ |
| Research Topics: | Long-term monitoring energy & greenhouse gas fluxes under high-latitude climate change |
| Acknowledgment: | Supported by Arctic Challenge for Sustainability (ArCS) project by the Ministry of Education, Culture, Sports, Science and Technology, Japan. |
- This site’s data can also be used under the more restrictive AmeriFlux Legacy Policy.
The AmeriFlux Legacy Policy must be followed if this site’s data are combined with data from sites that require the AmeriFlux Legacy Policy.
Copyright preference: Open use
US-Uaf: University of Alaska, Fairbanks
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Use the information below for citation of this site. See the Data Policy page for more details.
DOI(s) for citing US-Uaf 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-Uaf data are combined with data from sites that require the AmeriFlux Legacy Policy.
- AmeriFlux BASE: https://doi.org/10.17190/AMF/1480322
Citation: Masahito Ueyama, Hiroki Iwata, Yoshinobu Harazono (2025), AmeriFlux BASE US-Uaf University of Alaska, Fairbanks, Ver. 13-5, AmeriFlux AMP, (Dataset). https://doi.org/10.17190/AMF/1480322
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
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US-Uaf: University of Alaska, Fairbanks
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This page displays the list of downloads of data for the site US-Uaf.
Note: Results are the number of downloads to distinct data users. The Download Count column indicates the number of times the data user downloaded the data. The Version column refers to the version of the data product for the site that was downloaded by the data user.
| Date | Name | Data Product | Version | Intended Use | Intended Use Description | Download Count |
|---|
| Date | Name | Data Product | Vers. | Intended Use | Intended Use Description | Download Count |
|---|---|---|---|---|---|---|
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US-Uaf: University of Alaska, Fairbanks
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| AmeriFlux Images | Add Image |
US-Uaf US-Uaf with northern light
Keywords: —
Location:
View in Original Size
To download, right-click photo (Mac: control-click) and choose Save Image As
US-Uaf US-Uaf in winter 03/22/2018
Keywords: —
Location: Alaska, United States
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US-Uaf UAF Site, 2018.08.28
Keywords: US-Ufa
Location: United States
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US-Uaf: University of Alaska, Fairbanks
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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.
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
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 siteGeoNEX 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-Uaf, 64.8663, -147.8555.
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.
- 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.
- 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.
US-Uaf: University of Alaska, Fairbanks
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| AmeriFlux Publications | Add Publication |
| Year | Publication |
|---|---|
| 2024 | Ueyama, M., Iwata, H., Nagano, H., Kukuu, N., Harazono, Y. (2024) Anomalous Wet Summers And Rising Atmospheric Co 2 Concentrations Increase The Co 2 Sink In A Poorly Drained Forest On Permafrost, Proceedings Of The National Academy Of Sciences, 121(44), . https://doi.org/https://doi.org/10.1073/pnas.2414539121 |
| 2023 | Ueyama, M., Iwata, H., Endo, R., Harazono, Y. (2023) Methane And Carbon Dioxide Emissions From The Forest Floor Of A Black Spruce Forest On Permafrost In Interior Alaska, Polar Science, 35, 100921. https://doi.org/https://doi.org/10.1016/j.polar.2022.100921 |
| 2021 | Chu, H., Luo, X., Ouyang, Z., Chan, W. S., Dengel, S., Biraud, S. C., Torn, M. S., Metzger, S., Kumar, J., Arain, M. A., Arkebauer, T. J., Baldocchi, D., Bernacchi, C., Billesbach, D., Black, T. A., Blanken, P. D., Bohrer, G., Bracho, R., Brown, S., Brunsell, N. A., Chen, J., Chen, X., Clark, K., Desai, A. R., Duman, T., Durden, D., Fares, S., Forbrich, I., Gamon, J. A., Gough, C. M., Griffis, T., Helbig, M., Hollinger, D., Humphreys, E., Ikawa, H., Iwata, H., Ju, Y., Knowles, J. F., Knox, S. H., Kobayashi, H., Kolb, T., Law, B., Lee, X., Litvak, M., Liu, H., Munger, J. W., Noormets, A., Novick, K., Oberbauer, S. F., Oechel, W., Oikawa, P., Papuga, S. A., Pendall, E., Prajapati, P., Prueger, J., Quinton, W. L., Richardson, A. D., Russell, E. S., Scott, R. L., Starr, G., Staebler, R., Stoy, P. C., Stuart-Haëntjens, E., Sonnentag, O., Sullivan, R. C., Suyker, A., Ueyama, M., Vargas, R., Wood, J. D., Zona, D. (2021) Representativeness Of Eddy-Covariance Flux Footprints For Areas Surrounding Ameriflux Sites, Agricultural And Forest Meteorology, 301-302, 108350. https://doi.org/10.1016/j.agrformet.2021.108350 |
| 2020 | Ueyama, M., Yamamori, T., Iwata, H., Harazono, Y. (2020) Cooling And Moistening Of The Planetary Boundary Layer In Interior Alaska Due To A Postfire Change In Surface Energy Exchange, Journal Of Geophysical Research: Atmospheres, 125(18), . https://doi.org/10.1029/2020JD032968 |
| 2018 | Masahito UEYAMA, Narumi TAHARA, Hirohiko NAGANO, Naoki MAKITA, Hiroki IWATA, Yoshinobu HARAZONO (2018) Leaf- and ecosystem-scale photosynthetic parameters for the overstory and understory of boreal forests in interior Alaska, journal of Agricultural Meteorology, 74(2), 79-86. |
| 2016 | Ueyama, M., Tahara, N., Iwata, H., Euskirchen, E. S., Ikawa, H., Kobayashi, H., Nagano, H., Nakai, T., and Harazono, Y. (2016) Optimization of a biochemical model with eddy covariance measurements in black spruce forests of Alaska for estimating CO2 fertilization effects, Agric. Forest Meteorol., 222, 98-111. |
| 2015 | Harazono, Y., Iwata, H., Sakabe, A., Ueyama, M., Takahashi, K., Nagano, H., Nakai, T., and Kosugi, Y. (2015) Effects of water vapor dilution on trace gas flux, and practical correction methods, J. Agric. Meteorol., 71, 65-76. |
| 2015 | Iwata, H., Harazono, Y., Ueyama, M., Sakabe, A., Nagano H., Kosugi, Y., Takahashi, K., and Kim, Y. (2015) Methane exchange in a poorly-drained black spruce forest over permafrost observed using the eddy covariance technique, Agric. Forest Meteorol., 214-215, 157-168. |
| 2014 | Ueyama, M., Iwata, H., Harazono, Y. (2014) Autumn Warming Reduces The Co2sink Of A Black Spruce Forest In Interior Alaska Based On A Nine-Year Eddy Covariance Measurement, Global Change Biology, 20(4), 1161-1173. https://doi.org/doi:10.1111/gcb.12434 |
| 2014 | Ueyama, M., Kudo, S., Iwama, C., Nagano, H., Kobayashi, H., Harazono, Y. and Yoshikawa, K. (2014) Does summer warming reduce black spruce productivity in interior Alaska?, J. Forest Res., 20, 52-59. |
| 2012 | Iwata, H., Harazono, Y., and Ueyama, M. (2012) The role of permafrost on water exchange of a black spruce forest in Interior Alaska, Agric. Forest Meteorol., 161(107-115), . |
| 2012 | Iwata, H., Harazono, Y., and Ueyama, M. (2012) Sensitivity and offset changes of a fast-response open-path infrared gas analyzer during long-term observations in an Arctic environment, J. Agric. Meteorol., 68, 175-181. |
| 2010 | Iwata, H., Harazono, Y., and Ueyama, M. (2010) Influence of source/sink distributions on flux-gradient relationships in the roughtness sublayer over an open forest canopy under unstable conditions, Boundary Layer Meteorol., 136, 391-405. |
| 2010 | Ueyama, M., Harazono, Y., and Ichii, K. (2010) Satellite-based modeling of the carbon fluxes in mature black spruce forests in Alaska: a synthesis of the eddy covariance data and satellite remote sensing data, 2010, 14, 1-27. |
| 2009 | Date, T., Ueyama. M., Harazono, Y., Ota, Y., Iwata, T. and Yamamoto, S. (2009) Satellite observations of decadal scale CO2 fluxes over black spruce forests in Alaska associated with climate variability., J. Agric. Meteorol., 65, 47-60. |
| 2009 | Ueyama, M., Harazono, Y., Kim, Y. and Tanaka, N. (2009) Response of the carbon cycle in sub-arctic black spruce forests to climate change: Reduction of a carbon sink related to the sensitivity of heterotrophic respiration., Agric. Forest Meteorol., 149, 582-602. |
| 2007 | Kim, Y., Ueyama, M., Nakagawa, F., Tsunogai, U., Harazono, Y. and Tanaka, N. (2007) Assessment of winter fluxes of CO2 and CH4 in boreal forest soils of central Alaska estimated by the profile method and the chamber method: A diagnosis of methane emission and implications for the regional carbon budget, Tellus, 59B, 223-233. |
| 2007 | Kitamoto, T., Ueyama, M., Harazono, Y., Iwata, T. and Yamamoto, S. (2007) Applications of NOAA/AVHRR and observed fluxes to estimate regional carbon fluxes over black spruce forests in Alaska., J. Agric. Meteorol., 63, 171-183. |
| 2006 | Ueyama, M., Harazono, Y., Okada, R., Nojiri, A., Ohataki, E. and Miyata, A. (2006) Controlling factors on the inter-annual CO2 budget at a sub-arctic black spruce forest in interior Alaska, Tellus, 58B, 491-501. |
| 2006 | Ueyama, M., Harazaono, Y., Okada, R., Nojiri, A., Ohtaki, E. and Miyata, A. (2006) Micrometeorological measurements of methane flux at a boreal forest in central Alaska, Mem. Natl Inst. Polar Res., Spec. Issue, 59, 156-167. |
US-Uaf: University of Alaska, Fairbanks
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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.
- Download BADM for this site*
- View Site General Info for this site (Overview tab)*
- Use Online Editor to update Site General Info or DOI Authorship
- Update information about submitted data (Variable Information tool)
- More BADM resources
* 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.
US-Uaf: University of Alaska, Fairbanks
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Wind Roses
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