Answer the following questions — After you watch the You-Tube videos and read your lab —TWICE!
What is the relationship between dew point, relative humidity and the LCL?
How is the D.A.R and M.A.R. related to adiabatic processes?
Explain in your own words the relationship between rising air and relative humidity. In other words, what happens to air moisture contained in an air parcel as it rises in the atmosphere.
A parcel of air, with a temperature of 25C rises 2000 meters. The air is dry (less than 100% relative humidity). What is the final air temperature _________________.
The ambient air temperature is 20C and dew point is 10C. Calculate the LCL using the formula given in your lab book. Ta – Td / 8 Change the LCL value you calculated into meters by moving your decimal place over 3 places to the right OR multiplying by 1000. Make up your own Ta and Td and calculate the height of cloud formation with your numbers.
At the top of a mountain (4000 m), the air temperature is 5C. The air descends down the mountain to sea level. What is the final temperature at sea level ?______________________. Do you use the D.A.R or the M.A.R.? WHY?
Rising air passes the LCL with a temperature of 15C. The LCL is 1000 m. What is the temperature of the air parcel at 2000m, 2500m and 3000m (the top of the mountain) Do you use the D.A.R or the M.A.R. WHY?
Using terms windward and leeward, where would one expect rainy cloudy type weather and where would one expect dry warmer, no-clouds type weather.
Understanding what the LCL represents, where would one expect the LCL location on a foggy day? Explain your answer.
Fill in the following blanks: To properly and accurately fill in the tempertures, you first calculate the LCL. Then use the D.A.R as air moves up the windward side of the mountain to the LCL. Once passing the LCL, use the M.A.R to the top of the mountain. When air begins to descend, it compresses and adiabatically warms at the D.A.R. So, on the leeward side, you use the D.A.R. Your final temperature should be slightly higher then the temperature you started with on the windward side.
At sea level, on the windward side of the mountain, the temperature is 25C with a dew point of 12C. The LCL is _____________ meters above sea level. This is the altitude where clouds will form. The air (25C) begins to rise from sea level and reaches 500 m. What is the new temperature at 500m_______________? The air parcel continues to rise to 1000m. The new temperature at 1000 m is ________________. At 1500m the new temperature is ________________. The air now passes the LCL and reaches 2000m. The new temperature at 2000m is _____________. The air reaches the top of the mountain at 3000 m. The temperature at 3000m is ___________________. The air begins to descend down the mountain. The new temperature down the mountain at 2000 m is _________________. The air continues to descend to 1000m. What’s the new temperature at 1000m ___________________. Finally, the air descends to sea level, and the final temperature is ___________________.
Explain why you would use the M.A.R. for determining the correct temperature on elevations after passing the LCL. Why is there a difference between D.A.R. and the M.A.R. —– Hint: latent heat
Why does the LCL not exist on the leeward side of the mountain?
What is the temperature difference between your starting temperature (windward side) and your final temperature on the leeward side of the mountain.
How does adiabatic processes and orographic lifting relate to the San Joaquin Valley, specifically Bakersfield. Why do we (Bakersfield) live in a raid shadow?
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