Tuesday April 10, 2012

TuesdayApril 10, 2012

(Atmospheric Heating)

The Launch PadTuesday, 4/10/12

List and define the three mechanisms of heat transfer?

conductionconvectionradiation

Assignment Currently Open

Summative or Formative Date Issued Date Due

Date Into Grade Speed

Last Day

Quiz 24 S5 3/23 3/23 4/11

WS - The Coastal Zone and Waves F 3/27 3/30

Quiz 25 S6 3/30 3/30 4/11

WS – Weather, Climate, and the

AtmosphereF 4/2 4/5

WS – The Structure of the

AtmosphereF 4/4 4/10

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until 4:45.

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U.S. Records Warmest March; More Than 15,000 Warm Temperature Records Broken

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ActivityPlease take out a blank sheet of paper and put your name, date,

and period on it. Use today’s slides to write five

multiple choice questions concerning Atmospheric Heating.

Atmospheric Heating Heat is the flow of thermal

energy, and is always transferred from warmer to

cooler objects. There are three mechanisms of

heat transfer:Conduction through molecular

activity.Convection is mass movement

within a substance, usually vertical motions.

Radiation (electromagnetic radiation) travels at a velocity

of 186,000 miles per second in a vacuum.

Mechanisms of Heat Transfer

Figure 16.17

Atmospheric Heating Radiation (electromagnetic radiation) consists of different

wavelengths of energy:radio waves, microwaves, waves, infrared, visible, ultraviolet

(UV), x-rays, gamma (very short waves)

Visible light consists of an

array of colors we commonly call the

“colors of the rainbow.”

Rainbows are relatively common

optical phenomena

produced by the bending of light by

drops of water.

Atmospheric Heating Electromagnetic radiation is governed by basic laws. All objects, at whatever

temperature, emit radiation. Hotter objects radiate more total

energy per unit area than do cooler objects.

The hotter the radiating body, the shorter the wavelength of maximum

radiation.Hotter objects emit most of their radiation at shorter wavelengths;

hence they will appear to be bluer .Cooler objects emit most of their radiation at longer wavelengths;

hence they will appear to be redder.Objects that are good absorbers of radiation are good emitters as well.

Atmospheric Heating

The Earth’s atmosphere is largely transparent to incoming solar

radiation. Atmospheric effects include:

reflection (a surface’s albedo is the percent of solar radiation

reflected.)scattering

absorption Most visible radiation reaches the Earth’s surface, and about

50% is absorbed at the surface.