This data set contains the top-of-canopy irradiance in the shortwave (0.3-2.8 micron) and photosynthetically active radiation (PAR; 0.4-0.7 micron) wavebands collected with an Eppley Precision Spectral Pyranometer (PSP) and a Skye SKE510 pyranometer, respectively. The instruments were deployed at the top of the 30-m tower in the Kataba Local Forest approximately 20 km south of Mongu in Western Province, Zambia. The data include the hourly mean and maximum values from 0500-1600 GMT (7 a.m.-6 p.m. local time) and cover the period from September 4, 2000, to December 31, 2002. The data were obtained primarily for EOS validation and energy budget modeling.
The Skye SKE510 uses a blue enhanced planar diffused silicon detector and has a fairly even response from 400 to 700 nm. The Eppley PSP is a World Meteorological Organization First Class Radiometer designed for the measurement of sun and sky radiation, totally or in defined broad wavelength bands. It comprises a circular multi-junction wire-wound thermopile. A data logger sampled the sensors at 60-sec intervals and recorded the maximum and mean values every 60 minutes throughout the day.
The data are contained within a single ASCII text file, in comma-separated-value format, with associated date, time, and QA information.
Cite this data set as follows:
Privette J. L. and M. Mukelabai. 2005. SAFARI 2000 Surface Irradiance Measurements, Mongu Tower Site, Zambia, 2000-2002. 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/782.
Privette, J. L., R. B. Myneni, Y. Knyazikhin, M. Mukufute, G. Roberts, Y. Tian, Y. Wang, and S. G. Leblanc. 2002. Early spatial and temporal validation of MODIS LAI product in Africa. Remote Sensing of Environment, 83(1-2): 232-243.
The data file mongu_pyranometer_2000-2002.csv contains average and maximum irradiance in the shortwave (0.3-2.8 micron) and photosynthetic (visible, 0.3-0.7 micron) wavebands from the Kataba Local Forest near Mongu, Zambia. The data are contained within a single ASCII text file, in comma-separated-value format, with associated date, time, and QA information. The data file is described below.
|Day||Julian Day of Year||numeric||data logger||1-365|
|Time||Time at the end of the averaging period, in GMT||HHMM GMT||data logger||500-1600|
|Mean_PAR||Hourly Mean PAR Irradiance||W m-2||Skye SKE510||0-600|
|Max_PAR||Hourly Maximum PAR Irradiance||W m-2||Skye SKE510||0-600|
|Mean_Shortwave||Hourly Mean Shortwave Irradiance||W m-2||Eppley PSP||0-1300|
|Max_Shortwave||Hourly Maximum Shortwave Irradiance||W m-2||Eppley PSP||0-1300|
|Solar_Zenith_Angle||Solar Zenith Angle at the end of the averaging period||degrees (from nadir)||NA (calculated)||2.54-90.21|
|Solar_Azimuth_Angle||Solar Azimuth Angle at the end of the averaging period||degrees (from North)||NA (calculated)||9.3-349.64|
Additional information about the study site, data collection and processing, measurement theory, instrumentation, and data limitations or problems is found in the companion file: http://daac.ornl.gov/daacdata/safari2k/field_campaign/mongu_irradiance/comp/mongu_irradiance_readme.pdf.