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AIR PRESSURE FORCES AND WIND. PRESSURE GRADIENT FORCE. Definition: The difference in atmospheric pressure per unit distance PGF acts at right angles to isobars of equal pressure. H. L. 102.2. 99.8. 101.4. 100.6. 600 km. Pressure Gradient Force= 2.4 kPa / 600 km - PowerPoint PPT Presentation
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AIR PRESSUREFORCES AND WIND
H L102.2 99.8
101.4 100.6
600 km
Pressure Gradient Force = 2.4 kPa / 600 km= 0.4 kPa / 100 km
Definition:
The difference inatmosphericpressure per unitdistance
PGF acts at rightangles to isobarsof equal pressure
Where are winds strongest ?
Oct 18, 2004 Solution: HUDSON BAYCheck the spacing of the isobars of equal surface pressure
Source: NASA
Surface roughness decreases wind speedReduces impact of Inertial Coriolis Force
Winds cross isobars, spiralling out ofANTICYCLONES (H), and into CYCLONES (L)
H L
weather.unisys.com
H L
Air tends to be unstable in low pressure (tendency to rise)Air tends to be stable in high pressure (tendency to fall)
1. Equatorial Low Pressure Trough
2. Subtropical High Pressure Cells
3. Subpolar Low Pressure Cells
4. Weak Polar High Pressure Cells
RAIN FORESTSAVANNA
SAVANNA
DESERT
DESERT
BROADLEAF
BOREALTUNDRAICE CAP
ICE CAP
TUNDRA
MIXED TEMPERATE
MIXED TEMPERATE
How does this relate to the “jet stream”?
Geostrophic wind(above strong influence of friction)
CHAPTER 10
Sonic transducers
ULTRASONIC SOUNDWAVES DETERMINEWIND SPEED,DIRECTION &TEMPERATURE
http://www.wrds.uwyo.edu/wrds/rmfres/fendrift.html
Also SW Ontario
VANCOUVER LETHBRIDGE8°C 12°C
X X
CoolingAt MALR6°C/km
WarmingAt DALR10 °C/km
CoolingAt DALR10 °C/km
CoolingAt MALR6°C/km
WarmingAt DALR10 °C/km
More sensible heat
Santa Ana
Winds
Buried Portion
Exposed sectionEntrained Particle
A. Polar cellB. Hadley cellC. ITCZD. Ferrel cell
Which circulation cell extends from the equator to the subtropics?
A. Polar cellB. Hadley cellC. ITCZD. Ferrel cell
Which circulation cell extends from the equator to the subtropics?
A. Polar cellB. Hadley cellC. ITCZD. Ferrel cell
Which circulation cell extends from the subpolar lows to the poles?
A. Polar cellB. Hadley cellC. ITCZD. Ferrel cell
Which circulation cell extends from the subpolar lows to the poles?
A. Polar cellB. Hadley cellC. ITCZD. Ferrel cell
Which circulation cell extends from the subtropics to the subpolar lows?
A. Polar cellB. Hadley cellC. ITCZD. Ferrel cell
Which circulation cell extends from the subtropics to the subpolar lows?
A. trade windsB. westerliesC. ITCZD. easterlies
Which global wind belt is between the subtropical highs and the subpolar lows?
A. trade windsB. westerliesC. ITCZD. easterlies
Which global wind belt is between the subtropical highs and the subpolar lows?
A. trade windsB. westerliesC. ITCZD. easterlies
Which global wind belt is between the ITCZ and the subtropical highs?
A. trade windsB. westerliesC. ITCZD. easterlies
Which global wind belt is between the ITCZ and the subtropical highs?
A. cycloneB. jet streamC. tornadoD. semi permanent cell
What occupies the region labeled “A”?
A
A. cycloneB. jet streamC. tornadoD. semi permanent cell
What occupies the region labeled “A”?
A
A. isothermsB. isobarsC. pressure heightsD. isohyets
What are the dashed lines?
A
A. isothermsB. isobarsC. pressure heightsD. isohyets
What are the dashed lines?
A
A. many isobarsB. a cold frontC. a middle latitude cycloneD. Rossby waves
What do the lines on this map show?
A. many isobarsB. a cold frontC. a middle latitude cycloneD. Rossby waves
What do the lines on this map show?
A. summerB. winterC. fallD. spring
Which season is depicted in the photo?
A. summerB. winterC. fallD. spring
Which season is depicted in the photo?
A. New YorkB. FloridaC. TexasD. California
Where will the Santa Ana winds likely occur?
A. New YorkB. FloridaC. TexasD. California
Where will the Santa Ana winds likely occur?
Which type wind is depicted?
A. katabatic windB. land breezeC. sea breezeD. Santa Ana wind
A. katabatic windB. land breezeC. sea breezeD. Santa Ana wind
Which type wind is depicted?
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