GEO 211 1st Edition Lecture 23 Outline of Last Lecture I. Air pressure continuedA. How winds blow on closed isobarsB. Northern hemisphere, wind blow:1. Into low pressure counter clockwise (in spiral)2. From high pressure center clockwise (out spiral)C. Southern hemisphere1. Into low pressure center clockwise (in spiral)2. From high pressure center counter clockwise (out spiral)D. With cyclonesE. With anticyclonesII. Chapter 10- wind: global systemsA. Global circulation of winds and pressure systems at the surface (figure 10.2)Outline of Current Lecture III. Chapter 10- Wind: Global Systems continuedA. Wind circulation of each hemisphere is divided into 3 distinct cells1. Hadley cell (0°-30°)2. Ferrell cell (30°-60°)3. Polar cell (60°-90°)- Ridge- TroughCurrent LectureIII. Chapter 10- Wind: Global Systems continuedA. Wind circulation of each hemisphere is divided into 3 distinct cells1. Hadley cell (0°-30°)2. Ferrell cell (30°-60°)3. Polar cell (60°-90°)These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Handout shows variations in height (meters) where 500mb is found above sea level- Shows direction and speed of upper air windso Shown by flags- 500mb is found at higher elevations in low latitudes and at lower elevations in higher latitudes- Pressure decreases rapidly with height in higher latitudes than in lower altitudes- Higher elevation contours indicate high pressure, lower elevation contours indicate low pressure- PGF is from equator towards the poles- When deflected by Coriolis force, upper winds become predominately westerly- Westerly winds aloft flow in a wavy manner around the globe called rossby waves- Wavy flow creates ridges and troughs aloft- Ride- elongated area of high atmospheric pressure o Contours bend pole ward- Trough- elongated are of low pressureo Contours bend equator ward- Ridges/troughs will create:o Northwesterly/south westerly wind aloft- Embedded in winds aloft are jet
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