METR125: Physical Meteorology: Lecture: Atmospheric Thermodynamics (2)

1. METR125: Physical Meteorology:Lecture: Atmospheric Thermodynamics (2) Prof. Menglin S. Jin San Jose State University, Meteorology Acknowledgements: modified from Prof Peter Lynch’s online notes

2. Virtual Temperature

3. Real air, with moist

5. Virtual Temperature (Tv cont) • Hand out http://san.hufs.ac.kr/~gwlee/session3/tv.html Tv = (1+0.61w)TVirtual Temperature = (1 + (0.61 x Mixing Ratio)) x Temperature

13. why need this condition?

15. derive

17. The Hydrostatic Equation Balance of vertical forces in an atmosphere in hydrostatic balance.

18. The Hydrostatic Equation • Air pressure at any height in the atmosphere is due to the force per unit area exerted by the weight of all of the air lying above that height. Consequently, atmospheric pressure decreases with increasing height above the ground. • The net upward force acting on a thin horizontal slab of air, due to the decrease in atmospheric pressure with height, is generally very closely in balance with the downward force due to gravitational attraction that acts on the slab. • If the net upward pressure force on the slab is equal to the downward force of gravity on the slab, the atmosphere is said to be in hydrostatic balance.

20. Class Participation

27. FYI

28. FYI

30. Answer is here

31. Know how to Derive