Assignment Task
Task
Objective:
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Relate current weather patterns to the global atmospheric circulation model presented in class using information from interactive websites.
Part 1: General questions :
1. Answer questions about the convection process by choosing the correct answers below:
a. When air temperature (and kinetic energy) increases, air will [rise | sink]:
b. After an increase in temperature, the air is [more dense | less dense]:
c. This change in density promotes the parcel of air to [rise | sink]:
d. This vertical movement of air causes air pressure to [increase | decrease]:
2. In the northern hemisphere, the Coriolis force results in the atmosphere around high pressure centers to move in a [clockwise or counterclockwise] _____________ direction, whereas around low pressure systems it moves in a [clockwise or counterclockwise] _____________ direction.
3. The following features of Earth’s atmospheric circulation occur at general geographic locations, as driven by thermal and dynamic circulation. Below please select the best answer for their latitude or general location by formatting the correct answers in bold type for a, b, c, and d.
a. Intertropical Convergence Zone (ITCZ) is located at: 0° or 80°N
b. Sub-Tropical High: 30°N or 60°N
c. Sub-Polar Low: 0° or 70°N
d. Polar Front: 20°N or 50°N
4. Find the regions of highest and lowest pressure (in units of millibars)
a. Highest pressure: Latitude:____°___ Longitude:____°___ What is the value of air pressure? __________.
b. Lowest pressure? Latitude:____°___ Longitude:____°___ What is the value of air pressure? __________ .
c. Are pressure values above in the appropriate range? (see textbook figures 4.3, 4.12)? ______.
5. Is the low pressure cell you found above in the location you would expect, based on the general location of the Subpolar Low in the general atmospheric circulation model? Explain your answer.
6. Locate the main Hawaiian Islands. Based on the patterns of isobars, what is your best estimate of the wind direction in Honolulu right now? Explain your answer.
7. How does the amount of atmospheric water around the ITCZ compare to the amount of water in the northern polar region? ITCZ: _________ kg/m2 , N Pole: _________ .kg/m2
8. Compare the amount of atmospheric water over the Hawaiian Islands today with the ITCZ. Hawaiian Islands: ________ kg/m2 , ITCZ: _________ kg/m2.
9. Find an area of high pressure in the North Pacific just north of Hawai‘i; you can recognize the high in the northern hemisphere by the direction of circulation. How would you describe the moisture content of the air in the middle of the high pressure?
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