MET4300_SWX_LEC10

MET4300_SWX_LEC10 - MET 4300 Lecture 10 Pressure System...

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MET 4300 Lecture 10 Pressure System Development
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What are the processes creating and destroying extratropical cyclones? Parent storms of many types of hazardous Develop from the imbalance between PGF and Coriolos force , primarily at the level of jetstream Dissipate due to friction
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Jet Stream and Jeststreaks
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Divergence & Convergence 1. Convergence within an air column increasing surface pressure Divergence within an air column decreasing surface pressure 2. Since air can’t be created or destroyed, areas of convergence and divergence produce vertical motion
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Dines’ Compensation Convergence over divergence and divergence over convergence Low-pressure Center High-pressure Center
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What are the causes of convergence and divergence? Imbalance between PGF and Coriolis force: 1. Curvature effect 2. Jetstreaks 3. Friction Diabatic heating and cooling
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Cyclonically Curved Flow Gradient wind balance around a low pressure in NH: Slower than geostrophic
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Antiyclonically Curved Flow Gradient wind balance around a high pressure center in NH: Faster than geostrophic
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Effect of Curvature on Meandering Flow: Subgeostrophic Supergeostrophic
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Jet Streaks and Ageostrophic Flow
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MET4300_SWX_LEC10 - MET 4300 Lecture 10 Pressure System...

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