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Michael Splitt
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R. Gates: There is ~10 km vertical separation between 10 mb and 1 mb (where temperature may peak between the stratosphere/mesosphere). Thus, there is still plenty of warmer air (especially if we consider the more relevant potential temperature) above 10 mb that can sink and warm.
Chris, Lift usually implies cooling (adiabatic expansion outweighs the advection of warm air upward in the atmosphere -- they exactly counter each other for neutral lapse rates). The warming, then, can be caused by horizontal advection of warm air or by large scale descent, or by diabatic effects (latent heat release, radiative fluxes). My WAG is that we are seeing large scale sinking motion causing the warming -- not uplift.
Chris, I am not sure where the apparent uplift you are referring to is. Note, that the plots have vertically averaged omega and no streamlines. I am wondering if this is simple descent down the sloping terrain from the Himalayas northward (a Chinook effect), or the forced descent from a vertical wave (such as with Colorado wind storms).
Thanks for the posting; as a meteorologist I want to correct a statement regarding omega: "The vertical rising or falling of air in the atmosphere is known as omega and is measured in Pascals per second (Pascal/s). A high positive omega over a geographic region would indicate that a large mass of air was rapidly moving upward in that region, and likewise, a negative omega would indicate that a mass of air that was falling or moving downward. " Omega is Dp/Dt in the the atmosphere and is opposite in sign to vertical velocity (Dz/Dt). If omega is positive, movement to higher pressure is implied and infers sinking motion; whereas when omega is negative it implies movement to lower pressure and infers upward motion.
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Apr 22, 2013