1 / 12

Thursday April 21, 2011

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.

mattox
Download Presentation

Thursday April 21, 2011

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ThursdayApril 21, 2011 (World Distribution of Temperature; Atmospheric Pressure)

  2. 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.

  3. 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!

  4. 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.

  5. World Distribution of Temperature On these maps, an isotherm is a line connecting places of equal temperature.

  6. 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.

  7. 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

  8. 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.

  9. 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.

  10. 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.

  11. Continue Lab Air Masses, the Middle-Latitude Cyclone, and Weather Maps

More Related