Re: advection

[brian whatcott <inet@INTELLISYS.NET>]

At 10:45 6/12/01 -0400, Carl Mungan wrote:
//
> "Advection" - haven't heard that word in so long I've forgotten it.
> What is the difference between "advection" and "convection" in their
> technical meanings?
//
> Carl E. Mungan, Asst. Prof. of Physics  410-293-6680 (O) -3729 (F)
>       U.S. Naval Academy, Stop 9C, Annapolis, MD 21402-5026
> mungan@usna.edu    http://physics.usna.edu/physics/faculty/mungan/

There are several usages visible on the net: vorticity advection,
temperature advection and advection fog among them.
 Particularly in this last mentioned case, the idea of horizontal
motion is prominent. Here is a definition from a met primer:

"Advection The horizontal transfer of air mass properties
     by the velocity field of the atmosphere."
 from    <www-nsidc.colorado.edu/arcticmet/glossary/advection.html>

This concurs with Uvarov and Isaacs' Dictionary of Science.

Pilots know advection fog as a warm moist wind blowing gently across a
relatively cooler landmass. They understand radiation fog as provoked by
radiative cooling of the landmass via a clear sky.


brian whatcott <inet@intellisys.net>  Altus OK
                Eureka!