Assessment of atmospheric pressure
This section is devoted to a possibility of use of the temperature profile measured by the MTP-5 for assessment of atmospheric pressure.
- In each point where the MTP-5 takes measurements, according to
Barometric Formula we will determine a profile of atmospheric pressure by the known temperature profile. For this we will use a full barometric formula of Laplace. This formula considers not only temperature, but also change of gravity with the geographic latitude and height, and also humidity of air.
- Laplace's formula has the following appearance :
(1), where :
h2 - h1 - difference of heights in meters between the top and lower level,
Òm - average temperature according to Calvin, equal to an arithmetic average to their value at two levels,
qm - mass fraction of water vapor (earlier specific humidity) equal to an arithmetic average to their value at two levels,
hm - arithmetic average value of height,
- geographic latitude, degree,
P2 è P1 - atmospheric pressure at the top and lower levels.
- To use Laplace's formula, it is necessary to define entry conditions.
As entry conditions we will use the standard conditions. Necessary data can be taken from the table.
Height, m Temperature, oC Atmospheric pressure, Pa Relative humidity,% 0 15 101325 0
- Thus, having applied this formula to each value of temperature at all heights and for every moment of measurement, we will receive a required profile of atmospheric pressure.
On the basis of this formula the program counting a profile of atmospheric pressure has been made. Besides, this program allows to calculate and other characteristics. In more detail...