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As part of its efforts to determine environmental and phenological states from radar imagery, the BOREAS RSS-17 team collected in situ tree xylem flow measurements for one growing season on five Picea mariana (black spruce) trees. The data were collected to obtain information on the temporal and spatial variability in water uptake by trees in the SSA-OBS (Picea mariana) stand in the BOREAS SSA. Temporally, the data were collected in 30-minute intervals for 120 days from 31-May-1994 until 27-September-1994.

A guide document which includes more information about this data set can be found at

ORNL DAAC maintains information on the entire BOREAS Project.

Data Citation

Cite this data set as follows (citation revised on July 17, 2003):

Zimmermann, R., J. Way, K. C. McDonald, and R. Oren. 1998. BOREAS RSS-17 Xylem Flux Density Measurements at the SSA-OBS Site. Data set. Available on-line [] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.


Granier, A. 1985. Une nouvelle methode pour la mesure du flux de seve brute dans le tronc des arbres. Ann. Sci. For. 42 (2) 81-88.

Granier, A. 1987. Evaluation of Transpiration in a Douglas-fir Stand by means of Sap Flow Measurements. Tree Physiology. Vol. 3, pp. 309-319.

Granier, A., R. Huc, and F. Colin. 1992. Transpiration and stomatal conductance of two rain forest species growing in plantations (Simarouba amara and Goupia glabra) in French Guyana. Ann. Sci. For. 49, 17-24.

Galpen, M. 1996. Xylemfluss, Elementtransport und Bindung von Calcium und Magnesium in Fichten (Picea abies (L.) Karst.) von den ARINUS- Versuchsflachen im Schwarzwald. Freiburg. Bodenk. Abh. 36, Freiburg, Germany, 163 pp.

Hogg, E. H., T. A. Black, G. den Hartog, H. H. Neumann, R. Zimmerman, P. A. Hurdle, P. D. Blanken, Z. Nesic, P. C. Yang, R. M. Staebler, K. McDonald, and R. Oren. 1997. A Comparison of Sap Flow and Fluxes of Water Vapour from a Boreal deciduous forest. Journal of Geophysical Research (JGR), BOREAS Special Issue, 102(D24), Dec. 1997, pp. 28929-28937.

Lu, P. 1992. Ecophysiologie et reaction a la secheresse de trois espeches de coniferes (Abies alba Miller, Picea abies (L.) Karsten et Pinus sylvestris L.); effet de l age. Dissertation, University of Nancy, France, 116 pp.

Sellers, P.and F. Hall. 1994. Boreal Ecosystem-Atmosphere Study: Experiment Plan. Version 1994-3.0, NASA BOREAS Report (EXPLAN 94).

Sellers, P., F. Hall, H. Margolis, B. Kelly, D. Baldocchi, G. den Hartog, J. Cihlar, M.G. Ryan, B. Goodison, P. Crill, K.J. Ranson, D. Lettenmaier, and D.E. Wickland. 1995. The boreal ecosystem-atmosphere study (BOREAS): an overview and early results from the 1994 field year. Bulletin of the American Meteorological Society. 76(9):1549-1577.

Sellers, P., F. Hall, and K.F. Huemmrich. 1996. Boreal Ecosystem-Atmosphere Study: 1994 Operations. NASA BOREAS Report (OPS DOC 94).

Sellers, P.and F. Hall. 1996. Boreal Ecosystem-Atmosphere Study: Experiment Plan. Version 1996-2.0, NASA BOREAS Report (EXPLAN 96).

Sellers, P., F. Hall, and K.F. Huemmrich. 1997. Boreal Ecosystem-Atmosphere Study: 1996 Operations. NASA BOREAS Report (OPS DOC 96).

Sellers, P.J., F.G. Hall, R.D. Kelly, A. Black, D. Baldocchi, J. Berry, M. Ryan, K.J. Ranson, P.M. Crill, D.P. Lettenmaier, H. Margolis, J. Cihlar, J. Newcomer, D. Fitzjarrald, P.G. Jarvis, S.T. Gower, D. Halliwell, D. Williams, B. Goodison, D.E. Wickland, and F.E. Guertin. (1997). "BOREAS in 1997: Experiment Overview, Scientific Results and Future Directions", Journal of Geophysical Research (JGR), BOREAS Special Issue, 102(D24), Dec. 1997, pp. 28731-28770.

Way, J.B., R. Zimmermann, E. Rignot, K. McDonald, and R. Oren. Winter and spring thaw as observed with imaging radar at BOREAS. Journal of Geophysical Research (JGR), BOREAS Special Issue, 102(D24), Dec. 1997, pp. 29673-29684.

Data Format:

For information on Parameter/Variable Names, Variable Description/Definition, Units of Measurement, and Data File Format see this companion file

Document Information:

16-Nov-1998 (data citation revised on 26-Sep-2002)

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