Class Notes (922,111)
CA (542,723)
UTSC (32,892)
EESA09H3 (214)
Lecture 8

Lecture 8

2 Pages
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Department
Environmental Science
Course Code
EESA09H3
Professor
Tanzina Mohsin

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Lecture 8: Measuring Wind
Instrumentation
Wind direction
oWind vane or weather vane
oLocation is very important for placement of weather vane
Wind speed
oAnemometer
Upper level (above surface)
oDrift of radiosonde
oDeduced from pressure measurements
oIf know change in pressure in altitude, can calculate this
Anemometers
Deflection
oFirst anemometer
oAlberti used a spring attached to a clip, which moves when there is wind
oNot good for light wind
oDa Vinci made another one which was good for light wind
oHooke expanded Da Vincis design
Pressure
oLind, when wind pushes the liquid- speed reflected in pressure
Cup
oRobinson, 1846
oFirst one was 4 cups and later converted to 3 cups
Windmill
oUses propeller to measure wind speed
Thermoelectric
o
Laser radar
oDoppler affect
oCapture by laser beams
Sonic
oChanges in speed of sound by wind
Upper Level Winds?
If know pressure of altitude, can measure wind speed
If know the 2 forces PGF and Coriolis can calculated geostrophic wind
Wind Chill
Combination of temperature and wind speed gives wind chill factor
If wind speed is higher, much colder
Doesnt mean temperature is decreasing, means body losing heat faster
-65 degree is the maximum that epiclimate can be destroyed at
Wind Rose
Show both wind direction and wind speed
Local Winds
Pearson
oHuge difference in wind breeze
Toronto Island
oLake effect wind, not present at Pearson
oDominant is lake effect wind
Wind Strength Scales
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Description
Lecture 8: Measuring Wind Instrumentation Wind direction o Wind vane or weather vane o Location is very important for placement of weather vane Wind speed o Anemometer Upper level (above surface) o Drift of radiosonde o Deduced from pressure measurements o If know change in pressure in altitude, can calculate this Anemometers Deflection o First anemometer o Alberti used a spring attached to a clip, which moves when there is wind o Not good for light wind o Da Vinci made another one which was good for light wind o Hooke expanded Da Vincis design Pressure o Lind, when wind pushes the liquid- speed reflected in pressure Cup o Robinson, 1846 o First one was 4 cups and later converted to 3 cups Windmill o Uses
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