AFM-13 Aircraft Flux Analyses

Summary:

For the BOReal Ecosystem-Atmosphere Study (BOREAS) in 1994 and 1996, the Airborne Fluxes and Meteorology (AFM) group was involved in measurements (from different platforms and heights within the atmospheric boundary layer) of key atmospheric variables and several surface-related parameters that can be used to describe the evolution of the atmospheric boundary layer and the boundary layer fluxes of sensible heat, latent heat, momentum, and CO2. Specifically, the AFM-13 team was interested in analysis and interpretation of airborne flux observations over a 16-km by 16-km grid site in each of the BOREAS study areas. The primary data used in the investigation were collected using the Canadian Twin Otter aircraft, one among the many research aircraft flown in BOREAS. The main objectives of the AFM-13 investigations are to use the Twin Otter-based data with tower flux data to map spatial and temporal variations in the fluxes of heat, moisture, and CO2, and to define realistic footprint functions over the BOREAS sites, so that airborne observations are related to the correct ground surface with its biological and ecological characteristics. These maps are then compared to maps of remote sensing observations over the sites. It is hoped that these studies help to develop regional scale models of fluxes of sensible heat, latent heat, and CO2 for global monitoring of climate change. This document presents a brief summary of the Twin Otter grid sites, the measured data, the type of analysis carried out, and the preliminary results from the 1994 Intensive Field Campaigns (IFCs).

A guide document which includes more information about this data set can be found at https://daac.ornl.gov/data/boreas/AFM/afm13afr/comp/AFM13.txt.

ORNL DAAC maintains information on the entire BOREAS Project.

Data Citation

Cite this data set as follows:

Schuepp, P. H., and S. O. Ogunjemiyo. 1999. AFM-13 Aircraft Flux Analyses. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. https://doi.org/10.3334/ORNLDAAC/245.

References:

Hall, F.G., Y.E. Shimabukuro, and K.F. Huemmrich. 1995. Remote Sensing of Forest Biophysical Structure Using Mixture Decomposition and Geometric Reflectance Models. Ecological Applications 5(4): 993-1013.

Hall, F.G. and D.E. Knapp. 1998. BOREAS TE-18 Landsat TM Maximum Likelihood Classification of the NSA. Oak Ridge National Laboratory Distributed Active Archive Center.

Hall, F.G. and D.E. Knapp. 1998. BOREAS TE-18 Landsat TM Maximum Likelihood Classification of the SSA. Oak Ridge National Laboratory Distributed Active Archive Center.

Kaharabata, S.K., P.H. Schuepp, S. Ogunjemiyo, S. Shen, M.Y. Leclerc, R.L. Desjardins, and J.I. MacPherson. 1997. Footprint considerations in BOREAS. Journal of Geophysical Research 102(D24): 29,113-29,124.

MacPherson, J.I. 1996. NRC Twin Otter Operations in BOREAS, Rep. Ltr-Fr-129, National Research Council, Ottawa, Ontario, Canada.

Mahrt, L. and Sun, J. 1996. Formulation of Heat Flux over the Boreal Forest. Proc. 22nd Conference on Agric. and Forest Meteorology, American Meteorology Society, Atlanta, GA, Jan. 28 - Feb. 2, 1996, p. 114-117.

Ogunjemiyo, O.S., P.H. Schuepp, J.I. MacPherson, and R.L. Desjardins. 1997. Analysis of Flux Maps vs. Surface Characteristics from Twin Otter Grid Flights in BOREAS 1994. Journal of Geophysical Research 102(D24): 29,135-29,145.

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.J., F.G. Hall, G. Asrar, D.E. Strebel, and R.E. Murphy. 1992. An overview of the First International Satellite Land Surface Climatology Project (ISLSCP) Field Experiment (FIFE). Journal of Geophysical Research 97 (D17): 18,345-18,371.

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, 102 (D24): 28,731-28,770.

Data Format:

For information on Parameter/Variable Names, Variable Description/Definition, Units of Measurement, and Data File Format see this companion file https://daac.ornl.gov/data/boreas/AFM/afm13afr/comp/afm13afr.def

Document Information:

14-Apr-1999 (data set citation revised on 12-Sep-2002)

Document Review Date:

14-Apr-1999

Document Curator:

webmaster@daac.ornl.gov

Document URL:

https://daac.ornl.gov