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On 6/16/06, Alexandre E Eremenko <> wrote:
>
> > I guess you ment -0.0065 ?
> >
> > Alex wrote:
> > "The water was very cool (and always is) here. I mean most people do not
> > dare to swim in Kiel till the beginning of August:-) But the air was
> hot, at
> > least that was what I felt:-)"
> >
> > Isn't that just the type of condition to create a high temperature
> gradient?
>
> There is some confusion here. Under the conditions I described,
> the gradient will be high indeed, but in what direction?
> The air is cooler nearer the surface. That is the temperature
> INCREASES with height. If I understood George's message
> correctly, "inversion" that can lead to positive dip
> occurs when we have the opposite phenomenon: the temperature
> DECREASES with height.
>
> Ducting occurs also with strong inversions, i.e. in cases of large lapse
rates with a positive sign. Or, more general, when sinZ (would) become >1.
Marcel
