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Material Type: Exam; Class: General Climatology; Subject: Geography; University: University of Wisconsin - Milwaukee; Term: Unknown 2000;
Typology: Exams
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GEOG 310 Exercise Four (F2000) ZERO Climate Model 5 points
FIRST READ THE ZERO MODEL GUIDE, ACQUAINT YOURSELF WITH THE PROGRAM, AND THEN DO THE PROBLEMS ON THE LAST TWO PAGES.
You will be working with a simple zero-dimensional computer model of the atmosphere. It combines the effects of all atmospheric parameters to produce one result, Global Average Temperature (GAT). When the program is first started the following will appear on the screen (possibly after a few odd network messages that can be ignored):
Global Energy Balance Climate Model Copyright © James E. Burt, 1984 The temperature is 0.0 degrees Celsius, and all parameters are at their standard values.
Enter: 0-run 1-new temp 2-new parms 3-time step 4-exit >
Your response here should be : 0 (be sure to hit the enter/return key) This will initialize the program to the current reference value of global average temperature (15.38 degrees Celsius). The printout will be:
dT/dt s clr s cld ir clr ir cld total total steps year temp deg/yr w/sq m w/sq m w/sq m w/sq m cloud albedo taken .0 .00 3.714 123.3 93.4 88.6 102.3 .540 .363 0 10.0 14.29 .300 132.3 103.9 108.6 125.4 .540 .306 7 20.0 15.31 .019 132.9 104.6 110.2 127.2 .540 .301 4 30.0 15.38 .001 132.9 104.6 110.3 127.3 .540 .301 3 40.0 15.38 .000 132.9 104.7 110.3 127.3 .540 .301 2 50.0 15.38 .000 132.9 104.7 110.3 127.3 .540 .301 1
Enter: 0-run 1-new temp 2-new parms 3-time step 4-exit >
The ZERO program gives you additional information besides GAT, and also allows you to change 13 variables. The following is a brief explanation of the options and their meaning.
When the program prints: "Enter: 0-run 1-new temp 2-new parms 3-time step 4-exit >"
This is the main menu. 0 will run the program the specified number of time steps (default is 5 steps of 10 years) and show the changes in GAT and other variables at each step. 1 allows you to change the current temperature to any value (not particularly useful for simple applications). 2 prints out the current and standard values of the parameters that you can change in the program, and allows you to change them. 3 lets you change to a different time step. 4 exits the program when you are finished.
The main output of the program shows the following:
dT/dt s clr s cld ir clr ir cld total total steps year temp deg/yr w/sq m w/sq m w/sq m w/sq m cloud albedo taken .0 15.38 .237 132.9 104.7 109.5 126.4 .540 .301 0 10.0 16.18 .015 133.4 105.2 110.7 127.9 .540 .298 5 20.0 16.23 .001 133.5 105.3 110.8 127.9 .540 .298 3 30.0 16.24 .000 133.5 105.3 110.8 127.9 .540 .298 2 40.0 16.24 .000 133.5 105.3 110.8 127.9 .540 .298 1 50.0 16.24 .000 133.5 105.3 110.8 127.9 .540 .298 1
GEOG 310 Exercise Four ZERO Climate Model 5 points
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