On Sunday, 31 January 2016 18:25:42 UTC, John Hall wrote:
In message , "Keith (Southend)"
writes
At what height does the stratosphere start? Going by this table would
it be 226hPa?
http://weatherfaqs.org.uk/book/export/html/174

It looks like it from the table, with TROP presumably standing for
"tropopause" and ISA for International Standard Atmosphere. But I think
that's an idealised figure, since AIUI (which isn't very far) the
tropopause is higher at the pole than at the equator (or is it the other
way round?) and also varies with the seasons. (Though I suppose it would
be possible for it to vary in height in such a way as to keep a constant
atmospheric pressure.)

I'm sure there'll be an expert along in a minute.
--
John Hall
"Honest criticism is hard to take,
particularly from a relative, a friend,
an acquaintance, or a stranger." Franklin P Jones
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Apparently you have to have the profile of a standard atmosphere for comparison purposes with the real atmosphere at some time and place. It's all about deviance.
I assume the standard in this case is the annual average over the whole world.

Len
Wembury
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