27. These are partially melted snowflakes that refreeze before striking the grou
ID: 293714 • Letter: 2
Question
27. These are partially melted snowflakes that refreeze before striking the ground as ice particles (a) Snow (b) Freezing Rain (c) Sleet (d) Hail Answer questions 28 through 31 using Figure 2 and the letters A-D Figure 2: Arrows correspond to the approximate speed of the geostrophic wind. 28. Trough axis 29. Region of maximum upper divergence associated with the trough 30. Region of maximum upper convergence associated with the trough 31. Ridge axis 32. What is the term used to describe the net inflow of air molecules into a region of the atmospl (a) jetstreak (b) divergence (c) convergence (d) diabatic process 33. Which of the following can enhance surface low-pressure systems? (a) Divergence aloft (b) Convergence aloft. (c) Cooling of the air near the surface (d) None of the above is correct.Explanation / Answer
27. Partially melted snowflakes which refreeze before hitting the ground as ice particles are known as sleet. This is not the case with freezing rain which freezes after it hits the ground. Snow and hail cannot be considered as partially melted snowflakes. Thus, option C) is correct.
28. Trough axis: B indicates the region containing the axis joining low pressure towards North.
29. Region of maximum upper divergence associated with the trough: C which indicates the downstream side of the trough and a surface low pressure leading to divergence at upper levels.
30. Region of maximum upper convergence associated with the trough: A which indicates the upstream side of the trough and a surface high pressure leading to convergence at upper levels.
31. Ridge axis: D indicates the region containing the line joining high pressure towards the south.
32. Jet streams are meandering currents which carry molecules through the atmosphere without any net influx or outflux. Divergence results in net outflux since the air is released into a low-pressure region. Diabatic process refers to the exchange of heat with surroundings causing both inflow and outflow. Convergence is the net influx of air molecules when the air is pushed into a zone of high pressure. So, option C) is correct.
33. Divergence aloft can enhance surface low-pressure systems by forcing the air to rise upwards and then sink at high altitudes. On the contrary, convergence aloft and cooling of the air at the surface will weaken surface low-pressure systems. So, option A) is correct.
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