GEO 211 1st Edition Lecture 23 Outline of Last Lecture I Air pressure continued A How winds blow on closed isobars B Northern hemisphere wind blow 1 Into low pressure counter clockwise in spiral 2 From high pressure center clockwise out spiral C Southern hemisphere 1 Into low pressure center clockwise in spiral 2 From high pressure center counter clockwise out spiral D With cyclones E With anticyclones II Chapter 10 wind global systems A Global circulation of winds and pressure systems at the surface figure 10 2 Outline of Current Lecture III Chapter 10 Wind Global Systems continued A Wind circulation of each hemisphere is divided into 3 distinct cells 1 Hadley cell 0 30 2 Ferrell cell 30 60 3 Polar cell 60 90 Ridge Trough Current Lecture III Chapter 10 Wind Global Systems continued A Wind circulation of each hemisphere is divided into 3 distinct cells 1 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 winds o 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 pressure o Contours bend equator ward Ridges troughs will create o Northwesterly south westerly wind aloft Embedded in winds aloft are jet streams
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