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*  Meteorological and flux data measured at a black spruce forest in UAF
*                                                                          
*           by Dr. Y. Harazono (International Arctic Research Center, UAF) 
*              Dr. M. Ueyama (Osaka Prefecture University), and 
*              Dr. H. Iwata (Shinshu University)
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In order to understand long-term variabilities in fluxes of sub-arctic forests under changing climate, carbon, water, and energy fluxes has been measured by the eddy covariance method from October 2002. Other micrometeorological and soil environmental data has been continuously measured. This dataset provides the flux and environmental data from 2003 to 2011. Details, such as the measurements, data processing, and site descriptions, were documented in following papers. This project supported by NSF, IARC-JAXA Information system, and KAKENHI.


Location   : 64��51'58.57"N, 147��51'19.91"W
Elevataion : 158 m
Vegetation : Open black spruce forest on the permafrost

Citations
CO2 flux    : 
Ueyama, M., Iwata, H., and Harazono, Y. 2014. Autumn warming reduces the CO2 sink of a black spruce forest in interior Alaska based on a nine-year eddy covariance measurement. Global Change Biol., 20, 1161-1173, doi: 10.1111/gcb.12434. 

Energy Flux :
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.


Other References : 
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.

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.

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.

Ueyama, M. and Harazono, Y. 2007b. Continuous observation at a sub-arctic black spruce forest in interior Alaska. AsiaFlux Newsletter 22, 25-33.

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.

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. 

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.

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.

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.

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. Earth Interactions, 14, 1-27.

Iwata, H., Ueyama, M., Harazono, Y., Tsuyuzaki, S., Kondo, M., and Uchida, M. 2011. Quick recovery of carbon dioxide exchanges in a burned black spruce forest in interior Alaska. SOLA, 7, 105-108.

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.

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.

Ueyama, M., Iwata, H., Harazono, Y., Euskirchen, E. S., Oechel, W. C., and Zona, D. 2013. Growing season and spatial variations of carbon fluxes of arctic and boreal ecosystems in Alaska. Ecological Applications, 28, 1798-1816.

Ueyama, M., Iwata, H., and Harazono, Y. 2014. Autumn warming reduces the CO2 sink of a black spruce forest in interior Alaska based on a nine-year eddy covariance measurement. Global Change Biol., 20, 1161-1173, doi: 10.1111/gcb.12434. 

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.

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., in press.