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test_4_written_100313_final_solns

test_4_written_100313_final_solns - EATS 1011 3.0...

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EATS 1011 3.0 Introduction to Atmospheric Science PLEASE DO NOT SEPARATE SHEETS Name_____________________________ Student number____________________ YORK UNIVERSITY FACULTY OF SCIENCE Department of Earth and Space Science and Engineering EATS1011 3.0 Introduction to Atmospheric Science Test 4 - Written - 25 minutes ~ 11:00-11:25 AM Vari Hall A, 16 th March, 2010 Attempt all three (3) questions. Useful quantities that you may need. Saturated adiabatic lapse rate, Γ M = 6°C /km (nominal). Dry adiabatic lapse rate, Γ D = g/Cp = 10°C /km. Degrees Kelvin = degrees C + 273 Terminal velocity V T = 1.4x10 8 xR 2 (m) m/s (R < 100 μ m) = 6.0x10 3 xR(m) m/s (R> 100 μ m) 1 mb = 100 Pascals The scale height, H = RT/g metres Mean acceleration due to gravity on the Earth: g = 9.8 m s -2 TEST 4 1 of 4 3/13/2010
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EATS 1011 3.0 Introduction to Atmospheric Science Please Print Name_____________________________ Student number____________________ 1. Clouds [50] a. Discuss briefly the conditions necessary for the formation of clouds (not rain) with reference to relative humidity, CCNs, solute effect. [10] Cloud droplets will generally form by condensation onto a CCN when the air RH is ~ 100%. A surface is generally required for formation which will be a small particle ~ 0.1 micron. If the particle is hygroscopic (or deliquescent like salt) the required RH will be reduced and can be as low as 70%. One way for this to occur is by cooling the air parcels so that the RH is increased. This can occur via vertical transport and adiabatic cooling (over mountains, hills etc), or by radiation cooling (fog can form this way), Raising the RH can also occur by addition of moisture such as “cold” air moving over warmer water. b. What is the characteristic size of a cloud droplet [10] The nominal size is about 10 microns for which the terminal speed is quite “small”, ie cloud drops can hang in the air for hours.
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