2. Diurnal cycle (20 points) 3-hourly measurements of surface temperature are li
ID: 803202 • Letter: 2
Question
2. Diurnal cycle (20 points) 3-hourly measurements of surface temperature are listed below. It was calm day with no significant advection of temperature or humidity. The surface pressure and the water vapor mixing ratio remained constant at 920 mb and 5 g/kg from 6 to 21. Complete the table using a tephigram Local Time 6:00 9:00 12:00 15:00 18:00 21:00 temperature 4 10 16 12 dewpoint temperature 2.53 2.5 2.5 2.53 2.54 2.5 wetbulb temperature 3.3 T(C) Wetbulb Potential 6.3 9.1 11.6 9.9 7.3 saturation mixing ratio5 relative humidity 59 40.3 27.7 35.5 52.3 Isentropic condensation |2.51 tem Isentropic condensation |899 0.9 0.3 1.4 0.7 0.4 820 687 728 ressure(mbExplanation / Answer
The wet bulb potential temperature an air parcel will have it were brought down adiabatically to 1000 mb temperature.It is determined by finding the wet bulb temperature and and then follow the moist adiabat through the lifting condensation level to the original pressure to 1000 mb. The temperature value at the intersection of moist adiabat and the 1000 mb will be the wet bulb potential temperature of the air parcel. It is expressed in kelvin.
Tephigram is a thermographic diagram used in weather analyis and forecasting. Usually radiosonde and temperature data are plotted on the diagram to calculate convective stability of the atmosphere.
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