Middle atmosphere diagram
|MSIS Model Temperatures for Davis in Summer and Winter|
This diagram shows the temperature structure of the atmosphere up to 120 km above Davis station, Antarctica, in January and July. Temperatures are expressed in degrees Kelvin (K): 273 K equals zero degrees Celsius (C).
In summer (January), the temperature decreases in the troposphere from 275 K at the ground to 225 K at the tropopause (~10 km). The temperature rises in the stratosphere to reach ~280 K at the stratopause (~45 km). The atmosphere gets cooler with increasing altitude through the mesosphere reaching ~140 K at the mesopause. In the thermosphere the temperature rises rapidly to reach 400 K at an altitude of 120km.
In winter (July), the temperature decreases from ~265 K (-12°C) at ground level to ~185 K (coldest region in winter atmosphere) at ~30 km. In the stratosphere the temperature rises to 265 K at the stratopause (~55 km). The temperature then decreases to a value of ~205 K at the mesopause (~100 km). The temperature increases as we move up through the lower thermosphere and reaches 325 K by 120 km.
Diagram prepared by John French from MSIS empirical model data