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Group B (a)

Group B (a). Module on Convective/Potential Instability Group Members: Steve Chai Tony Hansen Shing Yoh. Convective Instability. Experiment with lifting layers that are dry. Experiment with lifting layers containing adjustable amounts of moisture.

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Group B (a)

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  1. Group B (a) • Module on Convective/Potential Instability • Group Members: • Steve Chai • Tony Hansen • Shing Yoh

  2. Convective Instability • Experiment with lifting layers that are dry. • Experiment with lifting layers containing adjustable amounts of moisture. • Explore the changes in the stability of the layers. • Eventually discover relationship of qE to stability of the layer. • This experiment is to be performed BEFORE any lecture discussion of Convective Instability.

  3. Height (km) Pressure (mb) Temperature (°C) Top of Layer 10 20 30 Temperature (°C) Bottom of Layer 10 20 30 Continue Temperature (°C) Lift Restart

  4. “Spoon-feeding” Approach • Questions: • How does the stability of the layer change as it is lifted? • Gets more stable • Gets less stable • Stability doesn’t change • Can you make the layer unstable by lifting it? • Yes • No • I don’t know!?!

  5. Exploratory Approach • Try to make the lifted layer become unstable by adjusting the temperatures at the bottom and top of the layer before it is lifted. • Describe the change in the stability of the layer as it is lifted.

  6. Top of Layer Top of Layer Temperature (°C) 10 20 30 10 20 30 Temperature (°C) Dew Point (°C) Bottom of Layer Bottom of Layer 10 20 30 10 20 30 Continue Temperature (°C) Dew Point (°C) Height (km) Pressure (mb) Lift Restart

  7. Exploratory Approach • Try to make the layer become unstable by adjusting the dew point temperature at the bottom and at the top of the layer before it is lifted. • Describe the changes in the stability of the of the layer as it is lifted.

  8. What next? • Repeat the previous experiment, but now examine the profile of qE in the lifted layer. • How can you predict the changes in stability based upon the profile of qE ?

  9. Show qE Top of Layer Top of Layer Temperature (°C) 10 20 30 10 20 30 Temperature (°C) Dew Point (°C) Bottom of Layer Bottom of Layer 10 20 30 10 20 30 Temperature (°C) Dew Point (°C) Height (km) Pressure (mb) Lift Restart

  10. Show T, Td Top of Layer Top of Layer qE (°C) 10 20 30 10 20 30 Temperature (°C) Dew Point (°C) Bottom of Layer Bottom of Layer 10 20 30 10 20 30 Temperature (°C) Dew Point (°C) Height (km) Pressure (mb) Lift Restart

  11. How does this actually occur in the Atmosphere? • Show lifting along a frontal boundary with the attendant formation of stratus and, in some cases, convective clouds as the layer is lifted along a warm front, for example.

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