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Geophysical Research Letters
We present direct number density retrievals of carbon dioxide (CO 2) and molecular nitrogen (N 2) for the upper atmosphere of Mars using limb scan observations during October and November 2014 by the Imaging Ultraviolet Spectrograph on board NASA's Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft. We use retrieved CO 2 densities to derive temperature variability between 170 and 220 km. Analysis of the data shows (1) low-mid latitude northern hemisphere CO 2 densities at 170 km vary byfatcat:2ijdzatrw5gu5hpi2o4eovy5wi