Atmospheric effect

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The atmospheric effect Presentation by nasir abbas golvi

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Atmospheric effect

  1. 1. ATMOSPHERIC EFFECT PRESENTATION BY NASIR ABBAS GOLVI
  2. 2. We will discus about these topics. Condensation And Precipitation.  Air Masses.  Storms.  Atmospheric Pollution.  Climate And Pollution.
  3. 3. Atmospheric Effects The lower atmosphere (troposphere) is dynamic, resulting in frequent weather changes The movements and interactions of large air masses bring variations to our weather Large air masses can move thousands of miles and influence a region for a considerable time period
  4. 4. Condensation Water droplets do not form randomly, but form around microscopic foreign particles called hygroscopic nuclei present in the air Hygroscopic nuclei may consist of dust, smoke, soot, salt, or other small airborne particles If the proper type/size of airborne particles are not present, condensation may not occur or will be retarded
  5. 5. Precipitation  When condensation does occur, the tiny droplets are formed in updrafts and are easily suspended as a cloud  Precipitation requires larger drops to form  Two processes are thought to be responsible for the formation of drops large enough to fall  Coalescence  The Bergeron process
  6. 6.  Coalescence – the formation of larger drops by the collision of droplets Coalescence
  7. 7. The Bergeron Process  The Bergeron process involves three essential components  Ice crystals in the upper portion of the cloud  Supper cooled vapor in the lower portion of the cloud  Mixing or agitation brings the ice crystals in contact with the supper cooled vapor
  8. 8. Types of Precipitation  Precipitation occurs in the form of rain, snow,, hail, or fog
  9. 9. Hailstones  If the convection cells in the thunderstorms are powerful enough, hailstones can become quite large
  10. 10. Air Masses Air mass – a large body of air that takes on physical characteristics that distinguish it from the surrounding air The main physical characteristics the distinguish an air mass are temperature and moisture content
  11. 11. Storms  Storm – an atmospheric disturbance that may develop within a single air mass or may develop along the frontal boundary of air masses  There re different types of storms.  rainstorms, thunderstorms, ice storms, snowstorms, and tornadoes
  12. 12. Lightning and Thunder A lightning flash travels at the speed of 300,000 km/s (speed of light) Thunder is a sound and only travels at a speed of approximately 1/3 km/s (1/5 mi/s)
  13. 13. Atmospheric Pollution Pollution – any atypical contributions to the environment resulting from the activities of humans Air pollution is primarily the result of products of combustion and industrial processes that are released into the atmosphere Releasing waste gases and particulates into the atmosphere has long been practiced
  14. 14. Air Pollution Sources  The major source of air pollution is due to the combustion of fossil fuels – coal, oil, and gas  Increased amounts of CO2 in the atmosphere lead to increased acidity  Pollution and increased acidity of the rain results in statues and other structures undergoing increased/accelerated corrosion
  15. 15. Pollution and Climate  It is generally accepted by most scientists that the global climate is also being affected by atmospheric pollution  CO2 and other “greenhouse gases,” particulate emissions, and the resulting global cloud cover all affect the Earth’s also  Scientists are trying to understand climate changes by using various models  Climate models give scientists the opportunity to compare theories and use historical data to study the interrelationships between the Earth’s atmosphere and other factors  .
  16. 16. ?
  17. 17. THANKS FOR LISTENING

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