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## (Answered) Homework 6: Weather and Atmosphere

Question 1

On a 500mb surface, the pressure gradient force is directed from _____________.

1. High pressure to low pressure
2. Low pressure to high pressure
3. High geopotential height to low geopotential height
4. Low geopotential height to high geopotential height

Question 2

Consider an air parcel that initially features a northward trajectory from the equator towards the North Pole. How will the Coriolis force act on this air parcel once it starts moving?

1. The parcel’s trajectory will veer towards the west
2. The parcel’s trajectory will veer towards the east
3. The parcel’s trajectory will continue north
4. The parcel’s trajectory will reverse and move south

Question 3

Consider the map of 500mb geopotential height below. Which dashed line represents a trough axis, and which dashed line represents a ridge axis?

1. A identifies a trough axis and B identifies a ridge axis
2. B identifies a trough axis and C identifies a ridge axis
3. D identifies a trough axis and A identifies a ridge axis
4. A identifies a trough axis and D identifies a ridge axis

Question 4

If the atmospheric flow is relatively straight and located well above the surface, which atmospheric forces are responsible for determining the direction and magnitude of the prevailing wind?

1. Pressure gradient force and the Coriolis force
2. Pressure gradient force, Coriolis force, and Centrifugal force
3. Pressure gradient force, Coriolis force, Centrifugal force, and Friction
4. There is not enough information to determine the forces that apply

Question 5

Choose All That Apply: Of the atmospheric forces listed below, which are apparent forces that arise due to the fact we reside within a reference frame that is in motion.

2. Coriolis force
3. Centrifugal force
4. Friction

Question 6

Use the figure of 500mb geopotential height (black contours) and vorticity (shading) over Australia provided below. Which force balance most accurately describes the geostrophic wind at the yellow dot (dot 1)?

1. A
2. B
3. C
4. D

Question 7

Use the figure of 500mb geopotential height (shading) provided below. Which force balance most accurately describes a wind in gradient wind balance at the white dot (dot 2)?

1. A
2. B
3. C
4. D

Question 8

Use the figure of mean sea-level pressure (black contours) provided below. Which force balance most accurately describes the geostrophic wind at the green dot (dot 3)?

1. A
2. B
3. C
4. D

Question 9

Use the figure of mean sea-level pressure (black contours) provided below. Which force balance most accurately describes the surface wind balance observed at the orange dot (dot 4)?

1. A
2. B
3. C
4. D

Question 10

The effect of friction causes air near the surface to __________ within a low-pressure system, and to __________ within a high-pressure system.

1. converge; converge
2. converge; diverge
3. diverge; converge
4. diverge; diverge

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