ATOC 4720 class 42: Final review 1. Composition of the present atmosphere and its evolution The first two major composition of the present atmosphere: : 75.51% by mass; : 23.14% by mass; Evolution: The earth formed first, and its
present atmosphere are believed to be evolved from the volatile substance from volcanic eruption. Major composition of the raw atmosphere due to volcanic eruption: 85% , and 10% light 2. The distribution of
atmospheric pressure and density Where : 7-8 km; scale height; 3. The fair weather elecric field and charged particles Charged Particles: important for lightening, reflection of radio
waves, fair weather electric field, etc +++++++++ ------------- 4. Temperature distribution with height 5. Gas laws
For a unit mass dry air: For unit mass of moist air: Where Virtual temperature 6. The hydrostatic equation Large scale atmospheric motions satisfy hydrostatic balance.
Balance between the upward PGF and the downward gravitational Force. PGF Gravity 7. The geopotential and geopotential height : the work that must be done against the earhts
Gravitational field in order to raise a mass of 1kg From sea level to that point. J/kg. Geopotential height: 8. The hypsometric equation Warm air: thicker Cold air: thinner;
9. The first law of thermodynamics Applies for both diabetic and adiabatic processes. Diabetic: heat absorbed by a substance is used either to increase its internal energy or used to do external work. Adiabatic: dq=0.  Adiabatic expansion;  Adiabetic compression;
10. Lifting condensation level (LCL) The lifting condensation level is defined as the level to which a parcel of moist air can be lifted adiabatically before it becomes saturated with respect to a plane surface of water. LCL -- well defined cloud base. 11. Static stability and level of free convection
Conditionally unstable; Level of free convection Height x LCL Temperature
: unstable; T1=T1e; then T2>T2e T2 T1 T2e
T2e : stable; Convectively unstable; T inversion layer; 12. Atmospheric aerosols Effects on cloud and precipitation: CCN; Should know why. Homogeneous nucleation is difficult to grow big; Atmoshperic electricity, radiation, chemistry.
13. Hurricanes Dynamics: CISK; Air/sea interaction; Thermally direct Circulation: Available Potential
Energy (PE) Is converted to Kinetic energy (KE). Maintenance: warm Core maintenance-PE--KE; 14. Radiation Wien displacement law:
Stefan-Boltzmann law: Kirchhoffs law: 15. The global energy balance Top: 100% in 30% reflection 38%+26% atm emits;
23% latent; 7% sensible; 21% IR; 16. Photoionization, photodissociation of oxygen, and fromation of ozone layer Upper thermosphere, photoionization of molecules and atoms Produces ionosphere, absorbs solar radiation:
Photodissociation above 100km: Ozone is not formed in this high level however; mean free path Large, 3 body collision chance is small. 20-60km: O is trace but important for ozone formation. Three body clission chance is large because mean free Path is small.
Then, Reduce UV, Ozone layer protects the earth plants etc.
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