1 st Law of Thermodynamics Heat Transfer Lecture 4 February 15, 2010 1020 1016 1016 1020 To convert from Z time to CST, subtract 6 hours. 05Z = 11 PM CST 1020 1020 1024 1016 1020 1016 1024 1020 1016 Review from last week
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February 15, 2010
To convert from Z time to CST, subtract 6 hours. 05Z = 11 PM CST
In a cold cloud, all precipitation begins in the form of snow (ice crystals)
1. Rain drops of liquid water
2. Snow ice crystals
3. Sleet frozen rain drops
4. Freezing Rain rain the freezes on contact with a cold surface
5. Hail large pieces of ice
How do we get this variety if the origin of the precipitation is the same?
Flurries - Light snow falling for short durations. No accumulation or light dusting
PE = mgh
KE = ½ mv2
1 g of water must absorb about 4 times as much heat as the same quantity of air to raise its temperature by 1º C
The release of latent heat during cloud formation drives many atmospheric processes.
“Warm Air Advection”
A photon of ultra-violet radiation carries more energy than a photon of infrared radiation.
Emitted radiation can be:
Increasing the internal energy of the gas molecules.
Radiation is not absorbed or emitted from an object but it reaches the object and is reflected back. The Albedo represents the reflectivity of an object and describes the percentage of light that is sent back.
Scattered light is deflected in all directions, forward, backward, sideways. It is also called diffused light.
Radiation not absorbed, reflected, or scattered by a gas. The radiation passes through the gas unchanged.