Geography 3.1.16 Geog 1112
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This 2 page Class Notes was uploaded by Tizhana Turner on Wednesday March 2, 2016. The Class Notes belongs to Geog 1112 at Georgia State University taught by Zaina Qureshi, Lashonda J. Williams in Fall 2015. Since its upload, it has received 24 views. For similar materials see Intro to weather and climate in Geography at Georgia State University.
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Date Created: 03/02/16
Geography 3.1.16 What’s going on with the weather today? Any clouds? What does it look like? Wispy, lumpy, sheety? No Stable or unstable atmosphere? stable Temperature warm or cold? warm Is it humid? no Any precipitation? no Is it windy? No Water and Atmospheric Moisture Part 4: Precipitation Droplet Growth Depends on phase of water “Warm” clouds (T>0 degrees C) liquid water “Cold” clouds(T<0 degrees C) evaporation Warm Clouds: Collision Coalescence Water droplets move through cloud Droplets collide, stick together Most effective in the tropics “Cold” Clouds: Bergeron Process Ice crystals are more “attractive” than water droplets SVP bigger over water vs.ice Supercooled water evaporates, vapor deposits on ice Cold Clouds: Accretion and Aggregation Collision in cold clouds Accretion (riming): Supercooled water droplet freeze on ice crystals Aggregation: ice crystals collide form single larger ice crystals Precipitation Types How to determine type of precip: Look at temp profile from cloud to ground Types of Precip: Rain, Snow, Sleet, Freezing Rain Rain: warm layer of air( can start as snow) Snow: aggregates of ice crystals, Temp below freezing Sleet: Start as snow, Melts into rain, Refreezes into ice pellets, NOT hail Freezing Rain: start as snow, melts into rain, freezes on contact with surfaces, ice storms. To Summarize Moist air with nuclei Ascent and cooling Saturation Condensation or deposition Droplet or ice crystal growth Precipitation Measuring Precipitation ASOS: tipping bucket rain gauge Precipitation falls into heated collector, funneled into bucket. Only gives liquid amounts, point measurement, subject to errors Measuring Snow Must be measured by volunteers Standard method: snowboard Snow falls on board, measured with ruler Urban effects on Clouds and Precipitation Warmer air over cities + more convergence = fast rising air. Urban pollution = lots of CCN Result: More clouds Rainfall increased or decreased Need more moisture Slower raindrop growth Summer rainfall higher over/downwind of urban areas.