Air temperature and relative humidity measurements made at 1.5 km above the grou

Question

Air temperature and relative humidity measurements made at 1.5 km above the ground are 20 oC and 60 %, respectively. Air temperature and relative humidity measurements made at 2.0 km above the ground are 15 oC and 50 %, respectively.

A. At each level, calculate the specific humidity.

B. At each level, calculate the dew point temperature.

C. At each level, calculate the potential temperature.

D. At each level, calculate the virtual potential temperature.

E. Calculate the static stability parameter.

F. Indicate the type of atmospheric stability in the air layer.

Explanation / Answer

B At each level, calculate the dew point temprature.

Relative humidity is given as a percentage. two This proportion tells you how shut the air is to being saturated. two If the relative humidity is 100%, the air is saturated. If the relative humidity is 50%, the air consists of 1/2the water vapor required for it to be saturated. two If the amount of water vapor in the air increases, the relative humidity increases, and if the quantity of water vapor in the air decreases, the relative humidity decreases.

However, relative humidity is based on air temperature, too. two If the water vapor content stays the equal and the temperature drops, the relative humidity increases. If the water vapor content material stays the identical and the temperature rises, the relative humidity decreases. This is due to the fact chillier air doesn’t require as plenty moisture to becomesaturated as warmer air.

If you watch the climate in the summer, you’ll observe that the relative humidity is surely higher in the morning than in the afternoon. two This is because the cooler morning air is closer to saturation than the hotafternoon air, even with the same amount of water vapor. Surprisingly, there is no massive distinction in daily common relative humidity between summer season and winter. Since heat air is much less dense than cold air, there is extra room for water vapor in warm summer season air as in contrast with bloodless winter air.

Dew factor is a better indicator of humidity than relative humidity because it is no longer a percentage structured on temperature. two The dew factor is the temperature to which the air would have to be cooled to emerge as saturated.Below the dew point, water will condense out of the air onto surfaces. In the early morning, grass surfaces will be coated with water if the dead nighttemperature has dropped below the dew point. When humidity is high, the dew factor temperature is solely a few levels below, or equal to, air temperature. In dry places, like deserts of the southwest, air temperature can be 50 or 60 levels above the dew point. two Generally dew factor is a greaterdependable indicator of humidity than relative humidity due to the fact dew point is not modified via a exchange in air temperature and

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