EES 108 Class 07

EES 108 Class 07 - Stability of the Atmosphere EES 108...

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Unformatted text preview: Stability of the Atmosphere EES 108 Class #7 Thursday September 15 2011 Dew Point Lapse Rate • Dew point changes by 2.0°C/km • Below LCL: § T > dew point § Rise 1 km: • Temperature drops 10°C • Dew point drops 2°C • Temperature is 8°C closer to dew point § Fall 1 km: • Temperature rises 10°C • Dew point rises 2°C • Lifting Condensation Level (LCL): § Temperature = dew point § LCL = (T – Dew Point) / (8°C/km) Dry vs. Wet Lapse Adiabatic lapse • Why is WALR less than DALR? • DALR is always 10°C/km • WALR < DALR § Varies depending on humidity § Range: 4-8°C/kmv • Dew-point lapse rate = 2°C/km • Below LCL: § Air follows DALR § Dew point follows dew-point lapse rate • Above LCL: • Rising air: – Air follows WALR – Dew point = air temperature § Sinking Air: • Within clouds or fog: – Dew point = temperature – Temperature rises at the WALR. • No clouds or fog: – Dew point rises at dew point lapse rate – Temperature rises at the DALR What makes clouds? What raises air to the lifting-condensation level? Local convective lifting Local Convective Lifting Stability • Warm air rises § How high?...
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This note was uploaded on 12/15/2011 for the course EES 108 taught by Professor Giligan during the Spring '11 term at Vanderbilt.

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EES 108 Class 07 - Stability of the Atmosphere EES 108...

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