Eeyore said:
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.
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,
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.
Some intersting info on the topic:
Water volume in oceans: 1,320,000,000 km3, and world 1,360,000,000 km3
Interestingly, the ice caps and glaciers only account for 1.8% of this
(25,000,000 km3) From: <
http://en.wikipedia.org/wiki/Water_(molecule)>
Some more interesting info:
http://en.wikipedia.org/wiki/Sea_level_rise The sea has risen 130 m from
the last ice age @18,000 years ago. Also interesting is the stated info from
the 2001 IPCC report has now changed the expected ocean rise to be a very
small 9 to 88 cm in 2100.
And it's not all 12km deep btw. In fact I know of nowhere that deep. A heck of a
lot of it is shallow.
Plus it takes apparently ~ 10,000 years to make
significant changes in overall ocean temperatures.
Please cite that reference.
http://en.wikipedia.org/wiki/Global_warming - states "Relative to the
period 1860-1900, global temperatures on both land and sea have increased by
0.75 °C (1.4 °F),rise" Considering a 1 or 2 degree rise makes major changes
in weather patterns alone, I'd say that's very significant.
Also worth considering in that previous measurement, is the enormous growth
of energy consumption as the worlds populations grew and individuals
consumed more and more energy since the industrial revolution started to
take off in the late 1800's. In other words, the rate of temperature
increase should be rapidly accelerating. Hopefully there is a negative
feedback loop to stabilize the system, like water vapor, which is a green
house gas, but hopefully it will reflect enough thermal energy back into
space to create the negative feedback that is needed.
Maybe you ought to study science before posting ?
Perhaps it is you who ought to study science before posting.
