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BGSU - GEOG 1250 - Class Notes - Week 8

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BGSU - GEOG 1250 - Class Notes - Week 8

School: Bowling Green State University
Department: Geography
Course: Weather and Climate
Professor: Marius Paulikas
Term: Summer 2015
Tags:
Name: Topic 7 Notes - Weather and Climate
Description: Topic 7 Notes - Weather and Climate - Vertical Motions / Atmospheric Stability
Uploaded: 03/02/2018
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background image Topic 7
Vertical Motions, Atmospheric Stability
How Does Surface Air Rise? 4 ways o Orographic Lifting – air forced up due to the presentence of mountains o Convection – when air wants to rise on its own o Frontal Lifting – very large bodies of air with different density’s clashing in an  area stretching up to hundreds of miles; large geographic scale o Convergence – cooler air clashing with warmer less dense air; less dense air rises; small geographic scale Lapse Rates Adiabatic Cooling –  cooling which occurs due to a DECREASE in atmospheric pressure Adiabatic Warming –  warming which occurs due to an INCREASE in atmospheric  pressure Lapse Rate ­ the change in decreasing temperature relative to change in altitude Surface Air Rising As one goes up into the troposphere o Atmospheric Pressure, Density, and Temperature ­> Decrease Air rising from the surface o Temperature Air sinking to surface o Temperature  Molecular mass of air rising Lapse Rate Continued Dry Adiabatic Lapse Rate (DALR) – Temperature  DECREASES 10 degrees Celsius per km Moist Adiabatic Lapse Rate (MALR)  o Temperature  DECREASES 6 degrees Celsius per km o LCL (Lifted Condensation Level) Environmental Lapse Rate o Atmospheric Temperature decreases per km EXAMPLES
background image 4 km ­5 o  C 3 km 1 o  C 2 km (LCL) 7 o  C 1 km 17 o  C 0 km 27 o  C *  PAY ATTENTION TO WHERE THE LCL IS LOCATED * Cloud Cover = LCL and Upwards Clouds Along Mountains Windward Side – side of the mountain where the air is flowing towards the mountain and rising alongside the mountain Leeward Side – side of the mountain where air is flowing down and away from the  mountain o Calculate Leeward Side by:  ADD 10 Windward Side Leeward Side 4 km ­8 ­ ­ ­ 3 km ­2 ­8 + 10 = 2 2 km (LCL) 4 12 1 km 14 22 0 km 24 32 * Leeward Side should be larger (warmer) than Windward Side * Atmospheric Stability Level of Free Convection (LFC) Where the atmosphere first becomes unstable – first altitude Naturally start rising and accelerating upwards  MALR = 6 o  C DALR = 10 o  C

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School: Bowling Green State University
Department: Geography
Course: Weather and Climate
Professor: Marius Paulikas
Term: Summer 2015
Tags:
Name: Topic 7 Notes - Weather and Climate
Description: Topic 7 Notes - Weather and Climate - Vertical Motions / Atmospheric Stability
Uploaded: 03/02/2018
3 Pages 28 Views 22 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
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