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Thursday April 21, 2011. ( World Distribution of Temperature; Atmospheric Pressure ). The Launch Pad Thursday, 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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thursday april 21 2011
ThursdayApril 21, 2011

(World Distribution of Temperature; Atmospheric Pressure)


The Launch Pad

Thursday, 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.


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!

world distribution of temperature
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.

world distribution of temperature1
World Distribution of Temperature

On these maps, an isotherm is a line connecting places of equal temperature.

world distribution of temperature2
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.

world distribution of temperature3
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

atmospheric pressure
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.

atmospheric pressure1
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.

atmospheric pressure2
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.

continue lab
Continue Lab

Air Masses, the Middle-Latitude Cyclone, and Weather Maps