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Stability & Skew-T Lab for ATS 351, Lab Reports of Climatology

Colorado State University (CSU)Climatology

This is a lab document for ats 351, spring 2009, week 7, lab #6, which covers stability and skew-t analysis in meteorology. The lab includes 10 questions related to adiabatic processes, conditional instability, lifting condensation level, and skew-t diagram interpretation.

Typology: Lab Reports

Pre 2010

Uploaded on 11/08/2009

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ATS 351, Spring 2009
Week 7, Lab #6
Stability & Skew-T – 48 points
Due in lab: March 12th
1. (5 points) What is an adiabatic process? Why are the moist and dry adiabatic
rates of cooling different?
2. (5 points) If the atmosphere is conditionally unstable, what condition is necessary
to bring on instability?
3. (5 points) Explain the significance of the lifting condensation level. What is it
and how is it determined from a Skew-T diagram?
pf3
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ATS 351, Spring 2009

Week 7, Lab

Stability & Skew-T – 48 points

Due in lab: March 12

th

  1. (5 points) What is an adiabatic process? Why are the moist and dry adiabatic rates of cooling different?
  2. (5 points) If the atmosphere is conditionally unstable, what condition is necessary to bring on instability?
  3. (5 points) Explain the significance of the lifting condensation level. What is it and how is it determined from a Skew-T diagram?

Using the skew-T below, please answer questions 4-9: (3 points each)

  1. The surface temperature in Birmingham, Alabama was: a. 22 degrees Celsius b. 10 degrees Celsius c. 19 degrees Celsius d. 15 degrees Celsius
  2. The surface dew point temperature in Birmingham, Alabama was: a. 15 degrees Celsius b. 5 degrees Celsius c. -5 degrees Celsius d. 10 degrees Celsius
  1. (15 points) Plot the following temperatures and dew point temperatures on the Skew-T diagram provided. Do not forget to connect the points for each profile. The skew-T is constructed as follows:
    • Pressure is represented by the horizontal blue lines. (mb)
    • Temperature is represented by the diagonal red lines (°C)
    • Dry adiabats are the solid green lines
    • Moist adiabats are the dashed green lines
    • Mixing ratios are the diagonal dashed magenta line (g/kg) Pressure [mb] Temperature [ºC] Dew Point Temp. [ºC] 1000 24 17 950 22 16 900 19 14 850 15 10 800 10 8 750 6 4 700 2 - 650 -2 - 600 -4 - 550 -8 - 500 -11 - 450 -14 - 400 -18 - (1 point each) If an air parcel were to rise from the 1000 mb level: a. What is the pressure of the Lifting Condensation Level? b. What is the temperature of the Lifting Condensation Level? c. What would be the temperature of the parcel if it rose to the 700 mb level? d. What would be the temperature of the parcel if it rose to the 500 mb level?

e. What is the pressure at the Level of Free Convection? f. What is the pressure at the Equilibrium Level? g. Shade in the area of the Convective Inhibition (CIN) in blue. h. Shade in the area of the Convective Available Potential Energy (CAPE) in red. i. What is the lapse rate between 1000 and 900 mb (approximately)? Is this lapse rate stable or unstable with respect to the dry adiabatic lapse rate?