Lecture 5 - ♦ Types of electronic thermometers o...

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(Lecture 5) Latitudinal Heat Balance Worldwide average shortwave radiation is balanced by average long wave radiation o This is NOT true of each latitude N and S At 36 degrees latitude or below more shortwave radiation is received than lost o Above 36 degrees the opposite is true The earth’s atmosphere and to a lesser extent the oceans help transfer warmer air northward colder air southward o This drives winds and oceans currents 30-50 degrees latitude where most heat transfer occurs, areas of stormy weather Temperature Measurement Liquid in bulb type thermometers 16 th century device; expansion and contraction of liquid on an indexed scale NWS cooperative sites o Maximum thermometers (mercury) o Minimum thermometers (alcohol) Now we use more electronic types as opposed to this because mercury is considered super dangerous
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Unformatted text preview: ♦ Types of electronic thermometers: o Hygrothermometer (ASOS/AWOS applications) o Radiometers (satellite applications) o Bimetallic thermometers (thermograph applications) Thermometer Shelter/Exposure ♦ Thermometers are much better energy absorbers than air is ♦ You must observe rules when properly exposing an air thermometer Guidelines for Proper Thermometer Placement ♦ No direct sunlight ANYTIME on sensor! o Cotton region shelters white with door facing northward ♦ Well ventilated (cotton region shelter does this) ♦ Shielded from radiating surfaces (wall, cement) ♦ About 5 feet above ground level NEED TO KNOW ♦ Above a grassy/vegetated area ♦ As with most weather instruments, usually the more inconvenient the better!!!...
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