Implement mathematical representation of 1986 CIRA atmosphere
Aerospace Blockset / Environment / Atmosphere
The CIRA-86 Atmosphere Model block implements the mathematical representation of the 1986 Committee on Space Research (COSPAR) International Reference Atmosphere (CIRA). The block provides values for mean temperature, pressure, and zonal wind speed for the input geopotential altitude.
The CIRA-86 Atmosphere Model block port labels change based on the input and output units selected from the Units list.
This function uses a corrected version of the CIRA data files provided by J. Barnett in July 1990 in ASCII format.
This function has the limitations of the CIRA 1986 model. The values for the CIRA 1986 model are limited to the regions of 80 degrees S to 80 degrees N on the Earth and geopotential heights of 0 to 120 kilometers. In each monthly mean data set, values at 80 degrees S for 101,300 pascal or 0 meters were omitted because these levels are within the Antarctic land mass. For zonal mean pressure in constant altitude coordinates, pressure data is not available below 20 kilometers. Therefore, this is the bottom level of the CIRA climatology.
[1] Fleming, E. L., Chandra, S., Shoeberl, M. R., Barnett, J. J., Monthly Mean Global Climatology of Temperature, Wind, Geopotential Height and Pressure for 0-120 km, NASA TM100697, February 1988.
