(30 pts) The following questions will receive little or no partial credit. For t
ID: 120303 • Letter: #
Question
(30 pts) The following questions will receive little or no partial credit. For the most part they are mostly either right or wrong. Of course some leeway will be allowed for rounding. You can check your results using the skew T In p diagram, but you must solve these analytically. (a) (5 pts) A parcel of air has a relative humidity of 60%, a temperature of 25°C , and is at a pressure level of of 950 hPa. What is the water vapor mixing ratio of the air parcel? (b) (5pts) A parcel of air is at a pressure level of 1000 hPa. The vapor pressure and saturation vapor pressure of the air parcel are 20 hPa and 30 hPa, respectively. What is the dew-point temperature of the air parcel? (c) (5 pts) A dry shallow atmospheric layer has a temperature of 5°C and is char- acterized by N2-1.7x 10 's2. What is the environmental lapse rate of the layer?Explanation / Answer
A. The relative humidity value can be given by the ratio of mixing ratio which is actual to the mixing raton that is saturated.
rh = w/ws x 100
Saturated mixing ratio of the air parcel from rh 60% and temperature 25 degrees centigrade and at pressure 950 hps will be 0.61 grams per kg
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