NOAA's TIROS (Television Infrared Observation Satellite) Operational Vertical Sounder (TOVS) is a suite of three sensors: the Microwave Sounding Unit (MSU), the High-Resolution Infrared Radiation Sounder (HIRS), and the Stratospheric Sounding Unit (SSU). This suite of instruments is aboard the NOAA series of polar-orbiting operational meteorological satellites. TOVS-derived data provide a means to investigate long-term climate change and interannual variability and to study local and periodic phenomena such as El Nino and stratospheric warmings.
A set of the derived meteorological parameters for southern Africa was selected by SAFARI 2000. The data were extracted from 1 degree x 1 degree global fields, with data from each satellite's local AM and PM orbits provided separately.
Selected parameters for SAFARI 2000 data set:
Layer mean temperature at 4 coarse layers
Total effective cloud fraction Cloud fractions at 7 pressure layers
Longwave cloud radiative forcing
Outgoing long-wave radiation
Cloud top pressure
Precipitable water vapor above the surface and four pressure levels
Cloud top temperature
Cloud fraction at 7 pressure layers
Surface skin temperature
Specific humidity at surface and at 5 pressure layers
Temperature at multiple levels
Retrieved virtual temperature between levels
The data files are stored as annual files of pentad (5-day) images. The pentads are stored in band sequential [BSQ] format (one image after the other) within the yearly files, 73 pentads per file. There is one file for each of the AM and the PM satellite overpasses for each parameter provided.
Cite this data set as follows:
Susskind, J., and L. Iredell. 2004. SAFARI 2000 TOVS Surface and Atmospheric Parameters, 1-Deg, 1999-2001. 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. doi:10.3334/ORNLDAAC/717.
The data files are stored as annual files of pentad (5-day) images. The pentads are stored in band sequential [BSQ] format (one image after the other) within the yearly files, 73 pentads per file. There is one file for each of the AM and the PM satellite overpasses for each parameter provided. Additional data file information including subset processing, field names and descriptions, and dates associated with each of the 73 pentads is in the companion file [http://daac.ornl.gov/daacdata/safari2k/remote_sensing/TOVS/comp/tovs_pentad_atmosphere_doc.pdf ].