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Archive for the ‘Ice’ Category

Evidence for Warmer Interglacials from Ice Cores

Posted by greg2213 on January 12, 2013

Ok, let’s pretend this paper is onto something (yes, I noticed the 2009 date.)

6K warmer than this interglacial. Let’s pretend that Climate Sensitity is 3K (it’s a lot lower.) That’s two doublings of CO2, meaning that CO2 levels were roughly 15-1600 ppm back then.

So either the was a massive human civilzation back then pouring out gigatons of CO2, several times, since there were several interglacials, or a whole bunch of volcanoes poured an insane amount of CO2 into the air without adding the aerosols to cool things (and do it on a cyclical basis,) or…

The CO2 theory is bunk and CO2 is trivially important to global temps. Or this paper is bunk and we move on.

The abstract:

Stable isotope ratios of oxygen and hydrogen in the Antarctic ice core record have revolutionized our understanding of Pleistocene climate variations and have allowed reconstructions of Antarctic temperature over the past 800,000 years (800 kyr; refs 1, 2).

The relationship between the D/H ratio of mean annual precipitation and mean annual surface air temperature is said to be uniform ±10% over East Antarctica3 and constant with time ±20% (refs 3–5). In the absence of strong independent temperature proxy evidence allowing us to calibrate individual ice cores, prior general circulation model (GCM) studies have supported the assumption of constant uniform conversion for climates cooler than that of the present day3, 5.

Here we analyse the three available 340 kyr East Antarctic ice core records alongside input from GCM modelling. We show that for warmer interglacial periods the relationship between temperature and the isotopic signature varies among ice core sites, and that therefore the conversions must be nonlinear for at least some sites. Model results indicate that the isotopic composition of East Antarctic ice is less sensitive to temperature changes during warmer climates.

We conclude that previous temperature estimates from interglacial climates are likely to be too low. The available evidence is consistent with a peak Antarctic interglacial temperature that was at least 6 K higher than that of the present day —approximately double the widely quoted 3 ± 1.5 K (refs 5, 6).

The whole paper is behind a paywall, as usual, but the abstract is here.


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Greenland (ice) is Melting. So What?

Posted by greg2213 on May 23, 2010

From a WUWT post on the GRACE satellites measuring changes of the Greenland ice cap (more about GRACE here.)

Which sounds worse (more catastrophic?)

  1. … the island has been losing weight, an average of 183 gigatons (or 200 cubic kilometers) — in ice — annually during the past six years. That’s one third the volume of water in Lake Erie every year…  or
  2. …This is an annual loss of 0.008%, and a time to total loss of 12,000 years…

Gee… 12,000 years to the melting of the ice cap. Ooooo….

(we’ll ignore possible sources of error in the measurements.)

And a massive loss of Greenland ice would be a bad thing, because…? Sea level rise? Over 12,000 years I think we can adapt to a few feet of sea level rise. Unless, of course, our economies have been destroyed by our various governments, but that’s another post.

We could go back to farming Greenland, like the Vikings did. A warmer world would be a very nice thing.

The problem, of course, is that when the cooling sets in and drops us back into a “little ice age,” or a real ice age, melting Greenland ice will no longer be of interest. Not that it will be melting, anymore. Major cooling will put a lot more pressure on everything than warming will.

A nice fantasy: enviro-alarmists drop the catastrophic hype that they automatically add to all of their environmental statements and base those statements on reality and with proper context. Won’t happen, I know, but I did say it was a fantasy.

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