Re: That global warming thingy

In article <xF7Jh.35175$lY6.32796@edtnps90>, Jeff L wrote:

"Eeyore" <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote in message
news:45F4D15C.51DF91EB@xxxxxxxxxxxxxx

Jeff L wrote:

but the real
problem is not the ice melting, but the water expanding as it warms up.
We
warm the massive amounts of water on the planet up a few degrees, and it
expands enough to raise the sea level to very bad levels. Considering
the
deep sea oceans are 12 + km deep in most places,

Where ? I thought mainly 3 km for deep ocean.

My mistake from memory - that is the depth of some of the deeper ridges /
trenches in the ocean.

a small volumetric change of a 1% expansion could roughly raise the
levels:
12,000 m * 0.01 = 120m!

Where did you get your 1% from ?

It was just a quick calc to show how an seemingly insignificant number like
1% can make a huge difference.

To be a little more precise on a 1st order basis, and assuming everything
warms up the same amount on average:

The average depth of the ocean is 4,000m, ( from:
http://www.mbgnet.net/salt/oceans/data.htm , which seems to agree with the
other data I just looked up)

The thermal coefficient of expansion of water is about 0.00021 per deg C, at
20 deg C. Assuming this does not change significantly at most ocean temps,

It does. Most of the ocean mass is at temperature where the coefficient
is a lot closer to zero. Some is at temperature where the coefficient is
negative.

then, according to http://en.wikipedia.org/wiki/Global_warming , the
predicted global temperature increase is 1.1 to 6.4 deg C from 1990 to 2100.
So, best case is: 4,000 m * 0.00021 * 1.1 = 0.924 m
Worst case is: 4,000 m * 0.00021 * 6.4 = 5.376 m (17.64')

Not as significant as I expected, but still enough alone to take out a good
chunk of coastal land, including many cities.

- Don Klipstein (don@xxxxxxxxx)
.

Relevant Pages

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