Thursday April 21, 2011
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Transcript of Thursday April 21, 2011
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ThursdayApril 21, 2011
(World Distribution of Temperature;
Atmospheric Pressure)
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The Launch PadThursday, 4/21/11
Define the term “air mass.”
A very large body of air, covering thousands of square miles, that
contains similar temperature and humidity conditions throughout.
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Announcements
Please check your yearly average in this class.
If you are below 70 for the year, please come and see
me ASAP!There are only two more
grades remaining!
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Assignments For This Six-Weeks Date Issued Date Due
Lab – Air Masses, the Mid-Latitude Cyclones, and Weather Maps 4/20 4/25
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World Distribution of Temperature Temperature maps help analyze temperature distribution over given
areas. Temperatures are adjusted to sea level to eliminate the variable of
altitude.January and July are used for analysis because they represent the
temperature extremes.
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World Distribution of Temperature
On these maps, an
isotherm is a line
connecting places of
equal temperature.
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World Distribution of Temperature
On a global scale, temperature
patterns emerge. The temperature
decreases poleward from the tropics.
Isotherms exhibit a latitudinal shift
with the seasons.The warmest and
coldest temperatures occur
over land.
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World Distribution of Temperature
In the Southern Hemisphere, isotherms are straighter and
more stable. Isotherms show the annual temperature range of ocean
currents. Ranges are small near the
equator, and increase with an increase in latitude
Ranges are greatest over continental locations.
World Mean Sea-Level Temperatures in January
World Mean Sea-Level Temperatures in July
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Atmospheric Pressure Atmospheric pressure is the
force exerted by the weight of the air above.
The weight of the air above at sea level is 14.7 pounds per
square inch.
This pressure decreases with increasing altitude.
A common measurement unit of atmospheric pressure is the
millibar (mb).
Standard sea level pressure is 1013.2 mb.
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Atmospheric Pressure Another unit used in
atmospheric pressure measurement is inches of
mercury.
Standard sea level pressure is 29.92 inches of mercury.
The instrument used for measuring atmospheric
pressure is the barometer.
The mercury barometer was invented by Torricelli in 1643.
It uses a glass tube filled with mercury.
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Atmospheric Pressure Another type of barometer is the aneroid barometer, meaning “without liquid.”
This type of barometer uses an expanding
chamber. Another pressure instrument is the barograph, which
continuously records the air pressure.
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Continue LabAir Masses, the Middle-Latitude
Cyclone, and Weather Maps