9.1 Air Pressure, Air Masses, Isobars and Isotherms Practice

University:
Virtual High School
Course:
SBI4U | Biology
Academic year:

2024
Views:

297

Pages:

4
Author:

Khan Afghan

Name: _____________________________________ Period: ____ Due Date: ____________________________ 9.1 Air Pressure, Air Masses, Isobars and Isotherms Practice Part A. Air Pressure and Air Masses 1. In the center of a __________ pressure system, air tends to rise. In the center of a __________ pressure system, air tends to sink. (1 pt) 2. A __________ pressure system is likely to result in cloud formation and precipitation. A __________ pressure system usually results in dry conditions and fair weather. (1 pt) 3. Wind always blows from __________ pressure to __________ pressure. (1 pt) 4. Match the terms to the correct air mass below. (2 pts) between 0° and 25° n/s between 60° n/s and 90° n/s dry forms over land m P Continental Maritime c forms over the ocean T Polar cold humid warm Tropical 5. Describe the Earth surface where each air mass typically forms. (4 pts) cP cT mP mT 6. How is air released from a balloon a model for the pressure gradients that creates wind (hint: think about where there is H pressure vs. L pressure)? (1 pt) Part B. Isotherms 7. Isotherms and isobars are both types of contour lines used to show data on weather maps. What is the difference between the two lines? (1 pt) Color Key: 8. Isotherm Map (3 pts): • 70-80° F à Red a. Locate the 10° F dots. Connect these dots to draw the 10° F • 60-70° F à Orange isotherm. (note: this isotherm forms a triangle) • 50-60° F à Yellow b. Locate the 20° F dots. Connect these dots to draw the 20° F • 40-50° F à Green isotherm. (note: this isotherm forms a U shape, do not • 30-40° F à Light Blue connect in a loop) • 20-30° F à Dark Blue c. Continue drawing isotherms at 10° F intervals. Label each • Less than 20° F à Purple line. • Remember, isotherms never cross! • Do not connect over Canada or the ocean. d. Lightly color your map using the color key to the right. You will use all the colors listed. 9. Based on your isotherm map, what direction should you drive from Gainesville to find warmer temperatures? (1 pt) Part C. Isobars 10. Isobar Map (3 pts): a. Locate the 992 mb dots around the lowest pressure on the map. Connect these dots to draw the 992 mb isobar. (note: this isobar forms a triangle) b. Locate the 996 mb dots. Connect these dots to draw the 996 mb isobar. (note: this isotherm forms a loop) c. Continue drawing isotherms at 4 mb intervals up to the 1028 mb isobar. Label each line. • Use surrounding values to estimate isobar location. • There will be two distinct sets of isobar circles. • Remember, isobars never cross! d. Label the low pressure center with an L and the high pressure system with an H. 11. In what state is the high pressure center located? (1 pt) ______________________ 12. In what state is the low pressure center located? (1 pt) ______________________ Isotherm Map Isobar Map