GEO 155 1st Edition Lecture 12 Outline of Last Lecture Air Masses and Fronts Outline of Current Lecture I Mid latitudinal Cyclones a How they Develop b Steering by the Jet Stream c Latitudinal Energy Transport II Climate Classification a About Climate b Koppen s System Current Lecture Mid latitudinal Cyclones Between the polar easterlies and mid latitude westerlies there is a stationary front with a center of low pressure At this center winds from the easterlies and westerlies converge and create a cold front in the midlatitude westerlies and a warm front in the easterlies Cyclonic wind patterns Up above this is the Jet Stream Meridional pattern gives the phenomenon of vorticity o When the Jet blows at higher latitudes winds accelerate o When the Jet blows towards lower latitudes winds decelerate Divergence aloft example of dynamic uplift o Creates a void pulls air up from the surface to fill the Jet Stream Center of low pressure at the Jet Stream remains below the Jet Stream even though the Jet Stream can move Cold front at the decelerating winds 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 o Center of high pressure feeds air into the center of low pressure in between the decelerating and accelerating winds Warm front at the accelerating winds Cold front catches up to warm front as the Jet moves Earth sun relationship gives an energy difference between latitudes this leads to latitudinal temperature differences which brings a pressure gradient aloft PGF brings about Coriolis which contributes to the Jet Stream that gives dynamic uplift From there surface low pressures lead to mid latitudinal cyclones which create a massive energy distribution Moves cold air to a place of more energy and moves warm air to a place of less energy Midlatitudinal Cyclones Tropical Cyclones Energy from Jet Stream Land and water do not affect them Have fronts Rising air at the center Energy from warm ocean water Always weaken over land No fronts Sinking air at the center eye Climate Classification Long term patterns of weather Koppen s System A B C D E Tropical Dry Mild Winter Cold Winter Polar
View Full Document
Unlocking...