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Lecture 9

EESA09H3 Lecture Notes - Lecture 9: Weather Vane, Anemometer, Robert Hooke

Environmental Science
Course Code
Tanzina Mohsin

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One cell and three cell theory
Tropical cyclones/hurricanes
Multitude cyclones
Firestorms vs duststorms
Wind direction…wind vane or weather vane
Wind speed-anemometer
Measuring wind
o Insturments :
o Weather vane
o anemometer
o Deflection Anemometer-1st Anemometer invented to measure
wind…invented by leon battista
o Leonardo da vinci..improved it then Robert hooke changed it to more
o Pressure Anemometer follow bell meter james lind invented a tube
o U shaped tube blows into tube and pushes it…
o Cup Anemometer- invented by Thomas r. robinson< 3 % error up to
o Windmill Anemometer- uses a propeller to measure wind speed
o aerovane insure its pointed to wind
o Thermoelectric Anemometer- wire heated to above ambient temp.
rate of cooling wire is proportional to wind speed
o Laser rader Anemometer- same prinicaple as dopple radar
o Shift in frequency
o Laser beams are backscattered by moving air molecules
o Sonic Anemometer- invnented in 1994 by dr. andreas pflitsch
o Measures how sound waves are modified by the wind
Upper level winds
o Radiosonde drift-weather balloon
o Aircraft
o Dropsonde- instruments dropped from the air planes
o Deduced from pressure structure
Upper level wind calculations
Geostrophic winds
o Pressure gradient fore pulls from high pressure to low pressure
o Coriolis force pulls moving objects to the right in NH-left southern
o Balance b/t PGF and Coriolis
o Geostrophic winds
Wind chill
o How cold does it feel
o Combo of temp and wind speed
o Higher wind speeds-feels colder-greater heat loss
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