On Sat, 14 Dec 2019 07:48:31 +0000, The Natural Philosopher wrote:

> I cant recall 2018/19 being any worse than usual, and yes most of the
> flooding where I am is down to that. If you must use water meadows it
> behoves you to attend to their drainage schemes.
>
Our airfield has certainly been wetter during this and the previous two
winters than I can remember since I first visited it in 2001 - and its
the high spot in its local area.

> (And pressure to build on flood plains).
>
Yes, thats certainly utter stupidity.

> Odlly enough many degrees of warming 10,000 years ago allowed
> civilisation to flourish.
>
Global averages say that 10,000 years BC was about 1 C colder than the
Little Ice Age in the 1600s.

The only warmer period since then was 7500 - 3500 BC which was a whole 1
C warmer that the Little Ice Age.

After that the global temp declined slowly until the Little Ice age and
then stayed constant until 1900.

In the 100 years since then we've had a 1 C global rise - by far the
fastest change in the last 20,000 years. This *should* be expected to
raise rainfall because of increased evaporation from seas, lakes and
especially [*] transpiration from trees combine with warmer air being
able to contain more water vapour.

[*] recent work in the Amazon has shown that the transpiration water
vapour release rate by trees vastly exceeds the evaporation rate from
seas and freshwater. Both are, of course, temperature-dependent rates.


--
Martin    | martin at
Gregorie  | gregorie dot org

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