Chapter 8 (part II). Forces that Influence Winds Pressure Gradient Force: difference in pressure over distance Directed perpendicular to isobars from.

Slides:



Advertisements
Similar presentations
Chapter 8 Air pressure and winds.
Advertisements

Atmospheric Pressure and Wind
Class #5: Air pressure and winds Chapter 8 1Class #5 Tuesday, July 13, 2010.
Chapter 4. Atmospheric Pressure and Wind
Chapter 13 The Atmosphere in Motion
Air Pressure and Winds III
Air pressure and atmospheric motion
 XQ No Foldable – put in your journals; use markers or highlighters as needed.
Recitation Geostrophic Balance Thermal Wind Effect of Friction.
WIND Wind is movement of air caused by differences in air pressure.
Air Pressure and Wind Pressure: the amount of force exerted per unit of surface area Pressure can be increased in 2 ways 1.By increasing density or decreasing.
Chapter 10: Atmospheric Dynamics
What Makes the Wind Blow? ATS 351 Lecture 8 October 26, 2009.
Chapter 4 Atmospheric Pressure and Wind. The atmosphere contains a tremendous number of gas molecules being pulled toward Earth by the force of gravity.
Temperature, pressure, and winds. Review of last lecture Earth’s energy balance at the top of the atmosphere and at the surface. What percentage of solar.
Atmospheric Pressure and Wind. Atmospheric pressure: –force exerted by a column of air per unit area –Normal atmospheric pressure at sea level = 1013.
Air Pressure and Winds Dr. R. B. Schultz. Air Pressure Air pressure is the pressure exerted by the weight of air above. Average air pressure at sea level.
Atmospheric Force Balances
Geostrophic Balance The “Geostrophic wind” is flow in a straight line in which the pressure gradient force balances the Coriolis force. Lower Pressure.
What Causes the Wind Worksheet.
Force Balance (Chap. 6) ATM100. Topics of the Day ◦ Review Test 1 ◦ Newton’s Laws of Motion ◦ Review of vectors and forces ◦ Forces that act to move the.
Wind Causes of Wind.
Atmospheric pressure and winds
WIND Factors Affecting Wind  Wind is the result of horizontal differences in air pressure. Air flows from areas of higher pressure to areas of lower pressure.
Atmospheric Motions & Climate
The Atmosphere in Motion Chapter 18
What set the atmosphere in motion?. Review of last lecture Thickness of the atmosphere: less than 2% of Earth’s thickness Thickness of the atmosphere:
Copyright © 2013 Pearson Education, Inc. The Atmosphere: An Introduction to Meteorology, 12 th Lutgens Tarbuck Lectures by: Heather Gallacher, Cleveland.
Chapter 6 Atmospheric Forces and Wind
Air Pressure and Winds. Atmospheric Pressure  What causes air pressure to change in the horizontal?  Why does the air pressure change at the surface?
Named after the French Scientist Gaspard Gustave Coriolis Because of the Earth’s rotation, free moving objects … deflected to the right in the Northern.
What set the atmosphere in motion?
Chapter 6: Air Pressure and Winds Atmospheric pressure Atmospheric pressure Measuring air pressure Measuring air pressure Surface and upper-air charts.
NATS 101 Section 13: Lecture 15 Why does the wind blow? Part I.
Atmospheric Motion SOEE1400: Lecture 7. Plan of lecture 1.Forces on the air 2.Pressure gradient force 3.Coriolis force 4.Geostrophic wind 5.Effects of.
Wind Wind is the general horizontal motion of air from one location to another based on differences in air pressure Wind is the general horizontal motion.
Chapter 6: Air Pressure and Winds
The Wind: PGF Pressure gradient force is what sets air in motion
CHAPTER 6 AIR PRESSURE AND WINDS. Understanding Air Pressure - Air pressure is a very abstract term. We cannot actually see it or touch it. --- It is.
Lecture 7 Forces (gravity, pressure gradient force)
Chapter 6: Air pressure and winds Atmospheric pressure Atmospheric pressure Measuring air pressure Measuring air pressure Surface and upper-air charts.
There are 3 major forces that determine how strongly the wind will blow and in what direction: 1. Pressure Gradient Force ◦ push from high pressure to.
Understanding Wind. Review: What is air pressure? Air pressure: the force of the weight of air on a surface – exerted in all directions.
Isobars and wind barbs sea level pressure. factors affecting wind wind is the result of horizontal differences in pressure air flows from higher to lower.
Global air circulation Mr Askew. Pressure gradient, Coriolis force and Geostrophic flow  Wind is produced by different air pressure between places. 
Air Pressure and Winds II. RECAP Ideal gas law: how the pressure, the temperature and the density of an ideal gas relay to each other. Pressure and pressure.
Class #11 Monday, February 2 Class #11: Monday, February 2 Chapter 6 Forces and winds 1.
Weather Basics Air Pressure and Winds. Air Pressure Air has a mass and exerts a force called atmospheric pressure Air pressure is measured in millibars.
PRESSURE & WIND, GENERAL CIRCULATION, JET STREAMS.
Atmospheric Pressure and Wind
Lecture on Atmospheric Pressure
ATS/ESS 452: Synoptic Meteorology
Understanding Wind.
Understanding Wind.
Coriolis Effect.
19.1 Understanding Air Pressure & Wind
Air Pressure And Wind Chapter 19.
Chapter 8 Air Pressure and Winds.
Just how does it work? Atmospheric pressure= 14.7 psi
Wind Causes of Wind.
Wind Causes of Wind.
19.2 Pressure Centers and Winds
Why do air pressures vary?
Air Pressure and Wind.
FIGURE 6.14 Except at the equator, a free-moving object heading either east or west (or any other direction) will appear from the earth to deviate from.
Atmospheric Pressure Force exerted by the weight of the air above
Wind Causes of Wind.
Just how does it work? Atmospheric pressure= 14.7 psi
Isobars and wind barbs sea level pressure.
Global and Local Winds Why does Air Move ?
Presentation transcript:

Chapter 8 (part II)

Forces that Influence Winds Pressure Gradient Force: difference in pressure over distance Directed perpendicular to isobars from high to low. Large change in pressure over s short distance is a strong pressure gradient and vice versa. The force that causes the wind to blow.

Forces that Influence Winds Coriolis Force Apparent deflection due to rotation of the Earth (the rotation rate of Venus is so slow that the Coriolis force is extremely small on Venus) Right in northern hemisphere and left in southern hemisphere Stronger wind = greater deflection No Coriolis effect at the equator greatest at poles. Only influence direction, not speed Only has significant impact over long distances

Forces that Influence Winds Geostrophic Winds Earth turning winds Travel parallel to isobars Spacing of isobars indicates speed; close = fast, spread out = slow Topic: Math & Geostrophic Winds V g = 1 x Δp fρd

Forces that Influence Winds Gradient Winds Aloft Cyclonic: counterclockwise Anticyclonic: clockwise Gradient wind parallel to curved isobars Cyclostrophic near Equator Observation: Estimates Aloft Clouds indicate direction of winds, place pressure in location consistent with cloud location.

Stepped Art Fig. 8-29, p. 214

Forces that Influence Winds Winds on Upper-level Charts Winds parallel to contour lines and flow west to east Heights decrease from north to south Surface Winds Friction reduces the wind speed which in turn decrease the Coriolis effect. Winds cross the isobars at about 30° into low pressure and out of high pressure Buys-Ballots Law

Winds and Vertical Motion Replacement of lateral spreading of air results in the rise of air over a low pressure and subsidence over high pressure Hydrostatic equilibrium and equation Topic: Hydrostatic equation Δp = -ρg Δz

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.