ATM S 101, SPRING Quarter 2002

Weather

Course Outline









1. Introduction
  1.1 Overview and Logistics
         goals;  personnel;  evaluation;  reading  assignments
         web site:  www.atmos.washington.edu/2002Q2/101
  1.2 Weather and environmental problems
        Greenhouse warming, acid rain, ozone hole
  1.3 History of Meteorology
         weather vs. climate
  1.4 Evolution of the Earth's Atmosphere
        phase I: H and He
        phase II: volcanic out gassing and photosynthesis
        phase III (today): permanent and variable (trace) gases
 

2. Energy, Heat and Temperature
   2.1 Forms of Energy
   2.2 Kinetic Energy, Heat and Temperature
   2.3 Temperature Scales
   2.4 More on Heat
         specific heat
         latent heat and "phase" changes
   2.5 Energy transfer mechanisms
          conduction, convection and radiation
 

3. Radiation
   3.1 everything emits radiation
   3.2 radiation travels in waves
   3.3 the spectrum of EM waves
   3.4 Spectrum of the Sun and Earth
   3.5 Absorbers and Emitters
         Kirchhoff's Law
   3.6 Blackbodies
         Stefan Boltzman E ~ T^4
         Wein's Law    wavelength = 2987/T
   3.8 Radiative Equilibrium
         Energy In = Energy Out
         Temperature Constant
   3.9 Greenhouse Effect
         The Selective Absorbers:
            water vapor, carbon dioxide, methane ...
 

4. Vertical Structure of the Atmosphere
   4.1 Temperature profile
   4.2 Troposphere
          Where the weather is; Lapse Rate
   4.3 Stratosphere
          Where the Ozone is (and Ozone Hole)
   4.4 Mesosphere
   4.5 Thermosphere
   4.6 Exosphere
   4.7 Composition of Atmosphere w/ height
   4.8 Aurora Borealis and Australis
   4.9 Ozone Hole (guest lecture)
 

5. Periodic Temperature Cycles:    Seasonal and Diurnal
  5.1 The Seasonal Cycle: Earth's Orbit, Earth's Tilt and Atmospheric Path Length
      Insolation at top of atmosphere
      North-south distribution of surface insolation
      Net radiation balance vs. latitude:  annual average
  5.2 Diurnal Cycle of Temperature
  5.3 Annual Cycle of Temperature
  5.4 Maritime vs. Continental
  5.5 Odds and Ends
  5.6 Summary of Temperature Controls
 

6 Tools: Density, Pressure and Ideal Gas Law
  6.1 Density
  6.2 Air Pressure
  6.3 Density and Pressure Distributions
  6.4 Pressure Units
  6.5 The Barometer
  6.6 Air Moving Vertically
  6.7 The Ideal Gas Law
 

7. Humidity
   7.1 Definitions
   7.2 Vapor Pressure
   7.3 Saturation Vapor Pressure
   7.4 Relative Humidity
   7.5 Dew Point
   7.6 Evaporative Cooling

8. Stability and Cloud Development
  8.1 The Basics
       An adiabatic process-- the dry and moist adiabatic lapse rates
  8.2  From Seattle to Spokane
                               * Rain
                  * Cloud Base           * Descent
       *  Cool, Moist                          * Hot, Dry
            Clear                                 Clear
  8.3 Stability
       Stable
       Neutral
       Unstable
       Conditionally Stable
  8.4 Lifting Mechanisms
  8.5 Cloud Types
  8.6 Growth of Raindrops
       Cloud Condensation Nuclei
       Curvature effects
       Collision and Coalescence
  8.7  Snow and Ice
 

9. Optics
  9.1 Bending of Light
       Reflection
       Scattering
       Refraction
       Diffraction
 9.2  Scattering/Reflection
       White Clouds, Blue Sky, Crepuscular Rays, Red Sunsets, Black Sky
       Refraction:  Twinkling Stars (scintillation) and shimmering objects, Mirages, Halos, Sun Dogs, Rainbows, Sun Pillars
       Diffraction:  Corona, Glory
 

10. Dynamical Forces and Circulation
 10.1 Vertical Pressure Gradient and Gravity
          Hydrostatic Balance
          Surface Pressure vs. Sea Level Pressure
  10.2 Horizontal Pressure Gradients
          Drive Circulation's: e.g., the Land and Sea Breezes
  10.3 Coriolis Force/Effect
  10.4 Geostrophic Balance and the Geostrophic Wind
  10.5 Maps of the height of the 500 mb surface
  10.6 Where are the Jets in the atmosphere?
  10.7 Flow around a Low and High
         Centripetal Force
  10.8 The Near Surface Wind: impact of friction
          Flow into a surface  Low (out of a surface High)
 

11. General Circulation
  11.1 The Driver: Insolation Gradients
  11.2 Circulation on a non rotating Earth: the Hadley Circulation
  11.3 Circulation on a rotating Earth: the Three Cell Model
         The Tropics
         The Mid latitudes
         The Poles
  11.4 Comparison of the throttle Model to the Climate of Earth
         The surface pressure in Winter and Summer
         Global Precipitation Patterns
  11.5 Actual vs. Idealized Sea Level Pressure
  11.6 Actual vs. Idealized Sea Level Precipitation
  11.7 Miscellaneous
 

12. Air Masses and Fronts
   12.1 Air Masses
   12.2 Fronts
         What are they? How do we locate them?
         Stationary Front
         Cold Front
         Warm Front
         Warm Occluded Front

13. The Mid latitude Cyclone
   13.1 Life Cycle of a Mid latitude Cyclone
   13.2 Vertical Structure of a Mid latitude Cyclone
           Upper level divergence as the key to growth
   13.3 Regions of Cyclogenesis (storm growth) for U.S.

14. Forecasting
    14.1 History
    14.2 Types of weather forecasts
           Climatology, persistence, trend, analog
    14.3 Numerical weather forecasts
           History, limits of predictability
    14.4 Seasonal forecasts and future climate forecasts
           Seasonal forecasts vs. weather forecasts, e.g., El Nino and hurricane
           Future climate forecasts vs. weather forecasts, e.g., increasing Greenhouse Gases

15. Hurricanes
     15.1  The fuel
     15.2  The anatomy
     15.3  Where they are found
     15.4  Seasonal forecasts

16. Weather phenomena unique to Puget Sound
     16.1  Marine Push
     16.2  Sound Breeze
     16.3  Puget Sound Convergence Zone
     16.4  Rain Shadow
     16.5  Pass Wind Storms (Katabatic Winds)
     16.6  Puget Sound Wind Storms (Channel Winds)
     16.7  Good link:  www.komotv.com/weather/faq/faq.asp

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