6. (8 marks) For the following example, assume that there is no gain of atmospheric moisture through evapotranspiration or loss through precipitation. Point A is on the windward slope of a mountain at an elevation of 0 metres. Point B is on the leeward slope at an elevation of 0 metres. The summit of the mountain is at 3000 metres. At point A, a parcel of air has a temperature of 30°C and a water vapour content of 7 g/kg. The saturated adiabatic lapse rate (SALR) is 6°C/1000 m. Refer to the saturation specific humidity table in the PowerPoint slides for Atmospheric Moisture for the calculations.
What is the saturation specific humidity of the parcel at point A? The chart indicated that it would be 26g/kg
What is the relative humidity of the parcel at point A? (7/26)*100=27g/kg
What is the dew point temperature as the parcel rises above point A?
I cannot figure this question out. Im not sure how I'm supposed to figure out the answer.
Thanks for the help.
Identify the glacial term that corresponds to each of the following.
I'm stuck on these two. Thanks for the help
Melting by wind:
Sudden massive melting:
To find the dew point temperature as the parcel rises above point A, you need to consider the concept of saturation. When air rises in elevation, it expands and cools down due to a decrease in atmospheric pressure. The cooling of the air can eventually lead to saturation, where the air is holding the maximum amount of water vapor it can at a given temperature, also known as the saturation specific humidity.
In this case, you have already determined that the saturation specific humidity at point A is 26 g/kg. This means that when the air temperature reaches the dew point temperature, condensation occurs, and the air becomes saturated.
To find the dew point temperature, you can use the saturation specific humidity table that was provided in the PowerPoint slides for Atmospheric Moisture. The table shows the saturation specific humidity at different temperatures. Find the value that is closest to 7 g/kg, and note the corresponding temperature.
For example, if the closest value in the table to 7 g/kg is at 25°C, then that would be the dew point temperature. However, if there isn't an exact match in the table, you can interpolate between the closest values to get an estimate.
Keep in mind that as the parcel of air rises above point A, it cools down due to the adiabatic lapse rate of 6°C/1000 m. So, you need to take into account the decrease in temperature as you calculate the dew point temperature at higher elevations.