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Dear George,

> We have to be careful about naming it "positive" or
> otherwise. Usually, dip is a value that you have to subtract

I follow the convention of the almanac tables.
The negative sign there indicates that you subtract:-)

But I agree to call it "reversed dip" to avoid confusion.

> There can be misunderstandings here, also.

Yes, I expected this too.

> Normally, with increasing
> height, the air temperature falls.

I thought this was not the case in the lower layer over a sea surface
I was confused by your example of a desert where sand
is hot and air is cool. I always thought that it is this
combination which gives reversed dip.
(You do not even have to go to the desert, just look
along a long, straight highway on a hot day. You will see
a strong reversed dip).

I thought that the combination of hot air and cold water
would give the opposite effect. That is normal dip.

But maybe I misunderstood something.
Have to read some article on the subject...

Now I depart to my sailing trip to Denmark,
hope the weather will permit some Cel Nav:-)

A

   

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