# atmoscira

Use COSPAR International Reference Atmosphere 1986 model

## Syntax

## Description

`[`

implements the mathematical representation of the Committee on Space Research (COSPAR)
International Reference Atmosphere (CIRA) 1986 model. The CIRA 1986 model provides a mean
climatology using a latitude, `T`

,`pressureOrAltitude`

,`zonalWind`

] = atmoscira(`latitude`

,`ctype`

,`coord`

)`latitude`

, and a representation of
coordinate type, `ctype`

. The mean climatology consists of temperature
`T`

, zonal wind `zonalWind`

, and pressure or
geopotential height `pressureOrAltitude`

. The provision encompasses
nearly pole-to-pole coverage (80 degrees S to 80 degrees N) for 0 km to 120 km. This
provision also encompasses the troposphere, middle atmosphere, and lower thermosphere. Use
this mathematical representation as a function of pressure or geopotential height.

This function uses a corrected version of the CIRA data files provided by J. Barnett in July 1990 in ASCII format.

`[`

uses a mean value type, `T`

,`pressureOrAltitude`

,`zonalWind`

]
= atmoscira(`latitude`

,`ctype`

,`coord`

,`mtype`

)`mtype`

, to implement these values.

`[`

uses a monthly mean value type, `T`

,`pressureOrAltitude`

,`zonalWind`

]
= atmoscira(`latitude`

,`ctype`

,`coord`

,`mtype`

,`month`

)`month`

, to implement these
values.

`[`

uses a mean value type, `T`

,`pressureOrAltitude`

,`zonalWind`

]
= atmoscira(`latitude`

,`ctype`

,`coord`

,`month`

)`mtype`

, and a monthly mean value type,
`month`

, to implement these values.

`[`

uses the argument `T`

,`pressureOrAltitude`

,`zonalWind`

]
= atmoscira(___,`action`

)`action`

to determine action reporting.

## Examples

## Input Arguments

## Output Arguments

## Limitations

This function has the limitations of the CIRA 1986 model and limits the values for the CIRA 1986 model.

The CIRA 1986 model that

`atmoscira`

implements limits values to latitudes of 80 degrees S to 80 degrees N on Earth and geopotential heights of 0 to 120 kilometers.`atmoscira`

clips output beyond these ranges.The CIRA 1986 model data also has missing data points.

In each monthly mean data set, the model omits values at 80 degrees S for 101,300 pascals or 0 meters because these levels are within the Antarctic land mass.

In the annual mean data set for latitudes 70, 75, and 80 degrees S, the model also omits these values:

101,300 and 78,895 pascal

0 and 2,500 meters

As a result of the missing data points, input for pressures above 61,441 pascal or geopotential heights below 5000 meters at these latitudes generate

`NaN`

output.For zonal mean pressure in constant altitude coordinates, pressure data is not available below 20 km. This value is the bottom level of the CIRA climatology.

When

`atmoscira`

detects an out-of-range input, the function uses the`action`

argument to determine the function behavior.

## References

[1] Fleming, E. L., S. Chandra, M. R.
Shoeberl, and J. J. Barnett. *Monthly Mean Global Climatology of Temperature, Wind,
Geopotential Height and Pressure for 0-120 km*. NASA TM100697, February
1988.

## Version History

**Introduced in R2007b**