re: Serious question: How do they tell what the past tempature of Earth was from an Ice Core?

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re: Serious question: How do they tell what the past tempature of Earth was from an Ice Core?

Laurie Street — 2/8/2007 4:16:56 PM (archived)

Because isotopic fractions of the heavier oxygen-18 (18O) and deuterium (D) in snowfall are temperature-dependent and a strong spatial correlation exists between the annual mean temperature and the mean isotopic ratio (18O or Î´D) of precipitation, it is possible to derive ice-core climate records

The Carbon Dioxide Information Analysis Center

The whole thread (60 posts)

Global warming - NATO freezes - ER - 2/7/2007 3:16:09 AM
- re: Global warming - NATO freezes - gbaikie - 2/10/2007 11:54:47 PM
- Serious question: How do they tell what the past tempature of Earth was from an Ice Core? - Scott Evil - 2/8/2007 3:09:28 PM
  - It is impossible to tell anything about the earth at all... - alcaray - 2/9/2007 1:44:23 AM
  - re: Serious question: How do they tell what the past tempature of Earth was from an Ice Core? - Laurie Street - 2/8/2007 4:16:56 PM
    - I still don't see why it's temperature dependent. (n/t) - ER - 2/9/2007 12:26:25 AM
      - 'Heavy' water molecules will evaporate from the ocean at a different rate than light ones - R.L. - 2/9/2007 12:36:07 AM
        
        R.L. That makes sense; however, is that truely indicative of "global" tempatures or just "polar region" tempatures? - Scott Evil - 2/9/2007 2:38:04 PM
        
        Global... - R.L. - 2/9/2007 3:01:08 PM
        
        re: Global... - gbaikie - 2/10/2007 2:21:32 AM
        
        Aw hell.. look... - R.L. - 2/10/2007 4:27:18 AM
        
        re: Aw hell.. look... - gbaikie - 2/10/2007 8:21:22 AM
        
        Sheesh 'no' in the last line should read 'know' - R.L. - 2/9/2007 3:10:09 PM
        
        Additionally... - R.L. - 2/9/2007 3:04:14 PM
        
        Thanks. - Scott Evil - 2/9/2007 6:38:19 PM
        
        Ice core CO2 data is also in line withe measurements taken throughout the world... - R.L. - 2/9/2007 6:46:49 PM
        
        As Tom mentioned below everything is a political issue. - Scott Evil - 2/9/2007 9:15:59 PM
        
        re: As Tom mentioned below everything is a political issue. - REB - 2/9/2007 10:32:51 PM
        
        But...On the topic of an orbiting shade... - Scott Evil - 2/9/2007 11:33:30 PM
        
        hey, then after the laserboy comments! - Scott Evil - 2/9/2007 11:39:31 PM
        
        Robert and I were working on that... - Scott Evil - 2/9/2007 11:22:22 PM
        
        A pretty good article at Wikipedia - TB - 2/9/2007 3:41:40 AM
        
        There are also small chemical differences in how differing isotopic water compositions react - R.L. - 2/9/2007 12:52:28 AM
        
        I knew that. I was just too dumb to think of it. (n/t) - ER - 2/9/2007 12:46:00 AM
    - Thanks for the info. - Scott Evil - 2/8/2007 5:01:19 PM
      - Quit rocking the boat! - SDAI-Tech1 - 2/8/2007 9:12:21 PM
        
        "When you............." - Lindy - 2/9/2007 3:20:47 AM
        
        When evil leftists... - SDAI-Tech1 - 2/10/2007 3:53:15 PM
        
        Touche' - Lindy - 2/11/2007 12:59:35 AM
        
        I'm just trying to ask a real question... - Scott Evil - 2/8/2007 11:11:40 PM
        
        I think it is a very good question. - ER - 2/9/2007 12:20:45 AM
        
        It really is straight forward, well understood physics.... - R.L. - 2/9/2007 12:29:26 AM
        
        Quit stabilizing the boat! - Laurie Street - 2/8/2007 9:37:00 PM
        
        re: Quit stabilizing the boat! - SDAI-Tech1 - 2/9/2007 5:28:18 AM
        
        So you think that industry types would be willing to kill future generations of their children and grandchildren for money? - Scott Evil - 2/8/2007 11:18:58 PM
        
        Why would they change now? It has always been that way. - Laurie Street - 2/9/2007 12:20:24 AM
        
        re: Heat - SteveS - 2/8/2007 11:31:58 PM
- Conveyors - TB - 2/8/2007 4:18:44 AM
  - "Even now, for some reason, modern temperature changes and warming seem to be mostly confined to the northern hemisphere." - ER - 2/8/2007 4:41:08 AM
    - re:9/10th of mankind lives in the northern hemisphere (n/t) - Raoul - 2/8/2007 5:07:08 PM
    - Hemispheres - TB - 2/8/2007 4:58:10 AM
      - Note the hot spot on the Antarctic Peninsula, just south of the S. tip of South America. (n/t) - ER - 2/8/2007 6:32:08 PM
      - re: Hemispheres - Laurie Street - 2/8/2007 5:13:19 AM
        
        The answer is probably not a simple one, and related to many factors. (n/t) - TB - 2/8/2007 9:06:07 PM
        
        The dates of perihelion and aphelion might be a factor, too. - LS - 2/8/2007 9:53:40 PM
        
        Indubitably. - LS - 2/8/2007 9:40:56 PM
        
        That's the problem... - TB - 2/9/2007 5:17:04 AM
        
        re: That's the problem... - Laurie Street - 2/9/2007 5:57:24 AM
        
        re: That's the problem... - gbaikie - 2/9/2007 7:07:16 AM
        
        re: Hemispheres - gbaikie - 2/8/2007 7:57:24 AM
      - re: Hemispheres - Marcia - 2/8/2007 5:09:08 AM
- re: Global warming - NATO freezes - alcaray - 2/7/2007 11:56:50 PM
- re: Global warming - NATO freezes - REB - 2/7/2007 6:50:58 PM
- Chaos - Robert - 2/7/2007 6:40:08 PM
- re: Global warming - NATO freezes - azstrummer - 2/7/2007 2:42:41 PM
  - re: Global warming - NATO freezes - Laurie Street - 2/8/2007 5:15:41 AM
    - re: Global warming - NATO freezes - azstrummer - 2/9/2007 5:58:25 AM
      - re: Global warming - NATO freezes - Laurie Street - 2/9/2007 6:20:57 AM
  - New Ice age? - ER - 2/7/2007 3:07:37 PM
- re: Global warming - NATO freezes - Laurie Street - 2/7/2007 5:00:59 AM

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