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Topic 3 Topic 3 Presentation Transcript

  • TOPIC 3 1. HIGH AND LOW PRESSURE 2. LAND AND SEA BREEZES TEXT PG 84-90
  • Essential Questions Definitions Learning outcomes A. What do high pressure and low pressure areas refer to? B. How are land and sea breezes formed? C. How are monsoons formed? - Hot air rises in low pressure areas and cool air sinks in high pressure areas and winds move from high pressure to low pressure areas. - Monsoon winds are results of differences in temperature between large land D. Explain how coastal temperatures are moderated by land and sea breezes and why the breezes move in this particular manner. C. Explain the formation of monsoon winds.
  • 3A. What do high pressure and low pressure areas refer to?  Air pressure ◦ force exerted on a unit area of the earth’s surface by the weight of a column of air above it ◦ Measured by Barometer  High Pressure ◦ Pressure above sea level value  Low Pressure ◦ Pressure below sea level value Sea level value of air pressure = 1,013mb
  • WIND - Movement of air from an area of high pressure to low pressure - Measured in : Speed, direction, frequency Can you guess what are their uses? Wind rose Wind vane Anemometer
  • 3B. HOW ARE LAND AND SEA BREEZES FORMED? - LOCAL WINDS IN COASTAL AREAS - LOWERS AND REGULATE THE TEMPERATURE OF COASTAL AREAS DURING DAY AND NIGHT - RESULTS IN SMALLER DIURNAL TEMPERATURE RANGE
  • Land and Sea breeze Day Night Land - Higher temperature - Lower pressure - Lower temperature - Higher pressure Sea - Lower temperature - Higher pressure - Higher temperature - Lower pressure Breez e type Sea breeze Land Breeze Breeze directio From sea to land From land to sea
  • Draw diagram using text pg 87 3D. Explain how coastal temperatures are moderated by land and sea breezes and why the breezes move in this particular manner.
  •  Regional wind patterns that reverse directio seasonally  Creates seasonal changes in rainfall  Affected by Coriolis effect ◦ Force produced by earth’s rotation ◦ Changes the course of moving objects ◦ Eg bending or deflection of winds Monsoon winds
  • Confusing Terms! Southwest monsoon  South = Australia (High pressure)  West = Direction of air movement from high (Australia) to low (Indian subcontinent) Northeast monsoon  North = Indian Subcontinent (High pressure)  East = Direction of air movement from high (Indian) to low (Australia) Australi a Australi a
  • 3C. How are monsoons formed? Pg 88 Southwest monsoon Northeast monsoon  During June and Sept  Summer in North, Winter in South  Different pressures in Central Asia and Australia  Air from Australia moves to Indian sub-continent and Central Asia  Coriolis effect: deflects winds to the right  Forms southwest monsoon winds and warm air picks up moisture  Brings heavy rain to  During Oct and Feb  Summer in South, Winter in North  High pressure develops over Indian sub-continent and Central Asia, low in Australia  Dry and cold wind  Coriolis effect deflects winds to the left  Forms northeast monsoon winds and warm air picks up moisture  Brings heavy rain to
  • Homework 3 1. What do high pressure and low pressure areas refer to? [2] 2. How are land and sea breezes formed? [2] 3. How are monsoons formed? [3]