1. (a) (5%) Given the following vertical temperature profile, compute the lapse
ID: 1714748 • Letter: 1
Question
1. (a) (5%) Given the following vertical temperature profile, compute the lapse rate and give the stability of the atmosphere. Show all work. elevation temperature 2.00 50.00 rc 4.00 3.52 (b) Two sources of SO; emissions are located close together. Source one emits 200 g/s at an effective stack height of 48 m. Source two emits 55 g/s at an effective stack height of 38 m. Source two is located 250m south and 400m east of source one (see figure). The wind moves from the west at a speed of 2.5m/s (measured at a height of 10 m). Assume that it is thinly overcast and the emission occurs in a highly urbanized area. (15%) The EPA has placed a SO2 sensor at location (s). The EPA's NAAQA standards require concentration lower than 1 5 /m. Determine if the ground-level SO; concentration (at night-time) at the sensor site fits the required regulations.Explanation / Answer
lapse rate is measured by rate of reduction of temperature with increase in increase in elevation
temperature at 2m elevation=4oC
temperature at 50m elevation = 3.52oC
lapse rate = (4-3.52)/(50-2)=1oC for every increase in 100m
Since this lapse rate is equal to the dry adiabbatic lapse rate,the stability condition of the atmosphere is neutral
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