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(Solved) Adiabatic Cooling Saturation occurs more commonly when air is cooled to its dew—point temperature than when air masses mix. in nature, this cooling...


Adiabatic Cooling Saturation occurs more commonly when air is cooled to its dew—point temperature than when air masses mix. in nature, this cooling often occurs when air rises. Consider a parcel of air that is forced to rise and does not mix with the surrounding environment. As the parcel rises atmospheric pressure around it decreases. allowing the parcel to expand (Figure 6-2). Since the parcel has the same number ofmolecules but occupies more volume, its average internal energy (i.e., temperature) decreases. Air can be forced to rise because of: a. intense surface heating. b. The “collision” or convergence ofsurface air masses. c. The contact ofair masses ofunlike tem- perature along warm and cold fronts. d. A topographic barrier {such as a moun— tain range}. e. Upper—air divergence (a concept we will discuss in a later lab}. As an unsaturated air parcel rises its temper- ature will decrease at the dry adiabatic lapse rate (DALR) of approximately 10°C per kilometer. 10. Calculate the temperature afan unsaturated air parcel at lOO-m increments as it is forced to rise from the earth's surface, where its temperature is 3 5°C. Height (In) lOOO ( I km) 900 800 700 600 500 400 300 200 100 Earth‘s surface Temperature lllllllll 35°C 3000 m _ . 2000 m — 9 1000 m — ® Parcel Temperature decreasing at the dry adiabatic lapse rate: 1”Cl100 rn Surlace — Height Figure 6-2. Adlabatic cooling of an unsaturated air parcel. It is possible that rising air parcels will cool to the dew-point temperature. When this hap- pens. a parcel becomes saturated and condensa- tion or clouds form. The height at which this occurs is called the ly'ting condensation level (LCL). If the air parcel rises above the LC L. it cools at a 510wer rate referred to as the saturated. moist or wet adiabatic lapse rate {WALR}. The wet adiabatic lapse rate ranges between 5°C and 9°C per kilo- meter. lt is slower than the dry adiabatic lapse rate because latent heat is released within the parcel as water vapor condenses, a warming that partially offsets adiabatic cooling. The WALR varies because the amount of condensation depends both on the amount of water vapor in the parcel and on atmospheric pressure.
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How would I find the temperatures for question 10?
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