Meteorology Tutorial: Adiabatic Cooling and Warming Processes (HD)

Unlike diabatic processes, no external heating or cooling is involved. The thermal changes are simply occurring within the air parcel. Now, how is this possible? Does the air parcel spontaneously increases or decreases its temperature. The answer is NO! Because energy cannot be created or destroyed. Atmospheric differences in pressure are what drive adiabatic cooling and warming processes. As you may already know, cold air sinks and warm air rises, due to the fact that warmer air is less dense and more buoyant than cooler air.

Adiabatic cooling process....(rising air)

For example: an air parcel at 1000mb is about 25C and the air at about 700mb is about 10c. Obviously, the air at the surface will rise because it is warmer. So, what is it that actually occurs within the air parcel that causes it rise?. Because the surface temperatures are higher than the temperatures at 700b, the air molecules within the air parcel will move faster. That is because heat is energy, and this means air molecules within the air parcel at 1000mb will have higher kinetic energy than the air parcel at above at 700mb. As the air molecules move faster, they will then acquire more space, and so 1 liter of air will now occupy less air molecules than it did previously, and the pressure within the parcel decreases as a result. The air molecules within the air parcel at the surface also clash and transfer energy with one another. Now, this causes the molecules to gradually lose their kinetic energy and since heat is energy, the molecules will start to cool down. Eventually, when the rising air parcel reaches 700mb, it will replace the 700mb stable air parcel. That air parcel will then start sinking


Adiabatic Warming process (sinking air)

The exact opposite happens when the air sinking.....


High pressure systems warm the ambient air adiabatically, because the pressure is higher, which means that the air molecules are more contracted. Synoptic scale anticyclones often help bring much warmer and nicer weather after a cold front during the winter (depends on which side of the anticyclones you are located).




Now, adiabatic processes are not strictly applied to atmospheric dynamics. An inflated air balloon or a deflating tire. For example, the air within a tire cools rapidly if you deflate, because it expands and cools adiabatically as it gushes out of the tire.

Thanks for watching!

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[crashsitetube]

I've given a fair amount of thought to this topic and I believe that the information in this video is incorrect. Unfortunately, the videotracks the way adiabatic heating and cooling is taught in physics classes.

[Hookkipa]

Thanks !

[templabs]

pV/T = constant.

(T in Kelvin)

[scribbullproductions]

@rn0100964

millibars

[rn0100964]

this is a cool video but what is MB???

[jammarocka15]

kool

[CHIBZZIE]

great job..