Biogenic volatile organic compound (BVOC) emissions were measured in a Colophospermum mopane woodland near Maun, Botswana, and in a Combretum-Acacia savanna in Kruger National Park, 13 km from Skukuza, Republic of South Africa (RSA) during the 2001 wet season campaign of SAFARI 2000. In addition, relaxed eddy accumulation (REA) measurements of BVOC fluxes (30 minute averages) were made on flux towers at these sites, where net CO2 emissions were also measured simultaneously. The investigators also took advantage of a wide variety of easily accessible plant specimens growing in a nursery in the Kruger National Park to screen an additional 95 species of African plants for their ability to emit isoprene, providing species level isoprene emission information which can be used to further initial estimates of isoprene emissions from additional ecosystems of southern Africa. A leaf cuvette technique was used to determine the emission capacities of the nursery plants and the temperature and light dependence of the emissions. This research on BVOC emissions contributes to attempts to develop a regional scale BVOC emissions model for southern Africa.
Data files contain records of BVOC measurements from the Maun and Skukuza flux tower sites; species level isoprene emissions and physiological data; and site meteorological data. The data files are stored as ASCII text files, in comma-delimited format, with column headers.
More information can be found in the companion file:
Cite this data set as follows:
Guenther, A. B., P. Harley, J. P. Greenberg, and L. Otter. 2004. SAFARI 2000 BVOC Measurements at Skukuza and Maun Flux Towers, Wet Season 2001. Data set. Available on-line [http://daac.ornl.gov/] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/759.
Greenberg, J. P., A. Guenther, P. Harley, L. Otter, E. M. Veenendaal, C. N. Hewitt, A. E. James, and S. M. Owen. 2003. Eddy flux and leaf-level measurements of biogenic VOC emissions from mopane woodland of Botswana, J. Geophys. Res., 108(D13): 8466, doi:10.1029/2002JD002317. Available for download (PDF).
Harley, P., L. Otter, A. Guenther, and J. Greenberg. 2003. Micrometeorological and leaf-level measurements of isoprene emissions from a southern African savanna. J. Geophys. Res., 108(D13), 8468, doi:10.1029/2002JD002592. Available for download (PDF).
Otter, L., A. Guenther, and J. Greenberg. 2002. Seasonal and spatial variations in biogenic hydrocarbon emissions from southern African savannas and woodlands. Atmos. Environ., 36: 4265-4275.
Scholes, R. J., et al. 2001. The environment and vegetation of the flux measurement site near Skukuza, Kruger National Park. Koedoe, 44: 73-83.
Data files contain records of BVOC measurements from the Maun and Skukuza flux tower sites; species level isoprene emissions and physiological data; and site meteorological data. The data files are stored as ASCII text files, in comma-delimited format, with column headers. A description of the data files is provided below:
|Day of year||numeric|
|Time||local time, decimal hour|
|a-pinene flux||mg m-2 h-1|
This file contains emissions data for a mopane woodland near Maun, Botswana for the period February 2-12, 2001.
|Time of Day||local time, decimal|
|Air Temperature||degrees Celcius|
|Std. Error||degrees Celcius|
|Incoming Shortwave||W m-2|
|Std. Error||W m-2|
This file contains data on average meteorological conditions at the Skukuza tower site for the duration of the tower flux study. Data are hourly means (S.E.) for the period February 1-8, 2001.
|Time of Day||local time, decimal|
|Wind Direction||degrees, clockwise from N|
|Isoprene Flux||mgC m-2 h-1|
This file contains a summary of isoprene concentrations (ppbv) and fluxes (mgC/m2/h) measured at Skukuza tower site for the period February 1-8, 2001. Isoprene concentrations were measured at 19 meters.
|Plant Family||family name|
|Leaf mass||g dry weight|
|specific leaf mass||g cm2|
|Photosynthesis||µmol m-2 s-1|
|Stomatal Conductance||mmol m-2 s-1|
|Internal CO2 concentration||µmol/mol|
|Transpiration||mmol m-2 s-1|
|Air Temperature||deg C|
|Leaf Temperature||deg C|
|Enclosure Flow rate||ml min-1|
|Photosynthetically Active Radiation||µmol m-2 s-1|
|Enclosure outlet isoprene concentration||ppm|
|Isoprene emission rate||µgC g h-1|
This file contains a summary of species level isoprene emissions and physiological data for 95 species of African plants.
Additional information about the data format, methodology, and parameters measured is found in the companion file: http://daac.ornl.gov/daacdata/safari2k/climate_meteorology/bvoc_flux/comp/bvoc_flux_readme.pdf.