Editing Mars Climate Orbiter (section)

=== Pressure Modulated Infrared Radiometer (PMIRR) ===
[[File:Mars Observer - PMIRR Diagram.png|thumb|PMIRR diagram]]
The Pressure Modulated Infrared Radiometer (PMIRR) uses narrow-band radiometric channels and two pressure modulation cells to measure atmospheric and surface emissions in the thermal infrared and a visible channel to measure dust particles and condensates in the atmosphere and on the surface at varying longitudes and seasons.{{r|NSSDCPMIRR}} Its principal investigator was Daniel McCleese at JPL/CALTECH. Similar objectives were later achieved with ''Mars Climate Sounder'' on board ''[[Mars Reconnaissance Orbiter]]''. Its objectives:{{r|MOObjectives}}
* Map the three-dimensional and time-varying thermal structure of the atmosphere from the surface to 80&nbsp;km altitude.
* Map the atmospheric dust loading and its global, vertical and temporal variation.
* Map the seasonal and spatial variation of the vertical distribution of atmospheric water vapor to an altitude of at least 35&nbsp;km.
* Distinguish between atmospheric condensates and map their spatial and temporal variation.
* Map the seasonal and spatial variability of atmospheric pressure.
* Monitor the polar radiation balance.