2. 1 Scale height of the Martian atmosphere
On Mars the atmosphere is mainly CO , th2 temperature is 220 K, and the
acceleration of gravity is 3.7 m s . What is the scale height of the Martian
atmosphere? Compare to the scale height of the Earth’s atmosphere.
2. 2 Scale height and atmospheric mass
Many species in the atmosphere have mass concentrations that decrease roughly
exponentially with altitude:
ρ(z =ρ (0 exp —--- (1)
where h is a species-dependent scale height.
1. If ρ(z) is horizontally uniform, show that the total atmospheric mass m of such
a species is given by
mA= ρ()0 h (2)
where A is the surface area of the Earth.
2. Equation (2) allows a quick estimate of the total atmospheric mass of a species