Re: That global warming thingy

In article <45F4D15C.51DF91EB@xxxxxxxxxxx>, Eeyore wrote:


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.

Most deep ocean is more like 5 km deep.

So when I said in my other post 2.4 meter sea level rise from thermal
expansion being on the alarmist side, take that down to 1 meter to correct
from 12 km to 5 km average ocean depth.

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 ?

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.

I figured a century or two for thermal time constant of the ocean mass
with respect to a change in balance between incoming and outgoing
radiation. Maybe soon I will try again and see if I get something
different - but I still expect somewhere from several decades to a few
or at most several centuries.
If 1 century is correct, then 1980-2007 linearly warming from "normal"
to .6 degree C high would have warmed the ocean mass so far by roughly 27%
of .3 degree C, a bit less than .1 degree C. With most of the ocean mass
at temperature close to that of maximum density of water, I am not
surprised if from 1980 to 2007 the sea level rose an inch or a centimeter
or stayed the same. I expect pretty much the same story in terms of ocean
expansion for the next .1 degree C rise in temperature of the hydrosphere
(2019-2020 or so), and not getting much worse until mid-century. A
century or two from now we may or may not have the oceans expand enough to
raise sea level by a meter. The big problem is if things warm up enough
to melt down the Greenland and Antarctica icecaps.

- Don Klipstein (don@xxxxxxxxx)
.

Relevant Pages

  • Re: [OT] Climate Change Is Going TO Kill Us All...
    ... the Ross Ice Shelf developed before its collapse? ... Have you made your own checks or measurements, snit? ... There were no measurable levels of ocean increases. ... As sea level has risen, ...
    (comp.sys.mac.advocacy)
  • Re: NBC: "There is no such thing as global warming, and...
    ... While the speed at which the ocean is rising -- almost two millimeters ... happening all along," said Miller. ... The new sea level record spanning 100 million years of geologic time is ... scientists had previously thought. ...
    (rec.music.artists.springsteen)
  • Re: That global warming thingy
    ... deep sea oceans are 12 + km deep in most places, ... Most deep ocean is more like 5 km deep. ... So when I said in my other post 2.4 meter sea level rise from thermal ... from 12 km to 5 km average ocean depth. ...
    (sci.electronics.design)
  • Re: OT: A little more GW stuff
    ... Deep Ocean ... Such violent eruptions of splintered, ... volcanoes lie along the Gakkel Ridge, ...
    (alt.smokers.cigars)
  • OT: A little more GW stuff
    ... Oceanographic Institution has uncovered evidence of explosive volcanic eruptions deep beneath the ice-covered surface of the Arctic Ocean. ... Such violent eruptions of splintered, fragmented rock--known as pyroclastic deposits -- were not thought possible at great ocean depths because of the intense weight and pressure of water and because of the composition of seafloor magma and rock. ... The volcanoes lie along the Gakkel Ridge, a remote and mostly unexplored section of the mid-ocean ridge system that runs through the Arctic Ocean. ...
    (alt.smokers.cigars)