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Cards In This Set
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In the southern hemisphere what causes the wind to be deflected to the left?
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The Coriolis force
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Respectively warm air advection, WAA and cold air advection, CAA typically occur on
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The western flank of a high pressure system and western flank of a low pressure system.
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When isotherms are at an angle to isobars on a temperature and pressure analysis in what state is the atmosphere?
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Baroclinic
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True or False? Warm air advection (WAA) cannot occur in a baroclinic atmosphere.
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False, You have good knowledge of WAA and baroclinicity.
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Which one of the following statements regarding the effect of frictional forces on high pressure and low pressure systems is TRUE? |
The effect of frictional retardation is to cause wind flow around a high pressure system to be deflected towards the pressure gradient force but only at an angle of approximately 10 to 30 degrees.
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What are the missing words in this sentence? Looking at a thermal wind chart, the thermal wind blows ......... to the ........ with ....... air to the ...... in the southern hemisphere.
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parallel, isotherms, cold, right
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Select the TRUE statement concerning isobars and wind flow patterns around high and low-pressure systems that are shown on a standard weather map.
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When the isobars are close together the pressure gradient force is greater and wind velocities are greater.
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What is the magnitude of the pressure gradient force between two isobars 1000 hectopascals and 998 hectopascals. The distance between the isobars is 100 kilometres.
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0.0016 Pa kg^-1 m^2
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What is the immediate effect of friction on wind?
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To decrease the wind speed and thus reduce the effect of the Coriolis force
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True or False? The magnitude of the Coriolis force is not directly proportional to wind speed.
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False:The Coriolis force IS directly proportional to the wind speed; zero when the air is stationary and at a maximum when the wind speed is at a maximum.
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TRUE or FALSE? The Coriolis force is responsible for wind flow undergoing a shift in direction known as backing. Backing is when the wind direction changes in a clockwise direction
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False and false. No forces come into play here. The term backing is just used to describe the behaviour of wind direction during a period of time, in this case backing is when the wind changes from NW to SW in an anticlockwise fashion.
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If the wind direction is said to be "veering" then in which direction (in the southern hemisphere) is the wind changing?
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Clockwise.
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Jet streams occur due to a gap in the height of the .
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Tropopause. . Wind at speeds of 60 knots and greater rush into these breaks in the tropopause. These high speed winds are known as jet streams.
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What cell circulation branch is responsible for the Trade wind flow?
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The Equatorward branch of the Hadley Cell.
Correct. You have a good understanding of diagram 1 in section 3.3.2. |
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Deserts are situated around 30 degrees north and south of the Equator? The reason being
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Because air essentially descends through the atmosphere around this latitude thanks to the poleward circulation of the Hadley cell.
You have applied your knowledge of locations on the Earth where air is rising and air is sinking. When air sinks it increases in temperature and pressure which in turn brings atmospheric stability. A stable atmosphere does not encourage cloud growth or rain. More about this in Teaching Week 4! |
