Mini Ice Ages and the Evolving Nature of Science

Friday, May 18th, 2007

I often hear complaints that science, writ large, changes its mind a lot. One study says salt is bad for you, another says it isn’t so harmful after all. What people often don’t understand is that the process of science is a provisional and a cumulative one, which makes it self-correcting over time. A small study of a population indicates that sodium intake may increase blood pressure, which is an indicator for a higher risk of heart disease. A later, larger study may show that other factors, like a high-fat diet, are more important predictors of what makes a ticker go bad. Another study indicates that genetic pre-disposition together with diet and exercise habits may be the best predictor for who will have heart attacks and who probably won’t. All the studies may be valid, but the results are provisional and our understanding may continue to evolve as new research is conducted. Human bodies are complicated, individualistic and variable machines so the answers about health and physiology are rarely completely straight-forward and universally applicable. The more we learn about human health and biology, however, the more we understand these complexities and variations.

0515-sci-clrcoldmap.jpgAnd so we come to climate, another complex system with many interlocking, interacting parts. For decades, oceanographers and climate scientists have been studying what’s known as the North Atlantic Current, an extension of the Gulf Stream, which carries warm, equatorial waters to North America and Europe. We did a webcast recently on the basics of this phenomenon, hosted by Exploratorium senior scientist Charles Carlson (scroll down to 4-21-2007). As recently as 12,000 years ago, this conveyor belt of warm salty water shut down when a flood of fresh water from melting glaciers poured into the ocean, plunging Europe and North America into a mini ice age (which was also the premise of a recent disaster film, “Day After Tomorrow.”) Scientists have been worried that global warming and the subsequent melting of ice sheets in Greenland would cause a similar disruption of the North Atlantic Current, but the recent IPCC report backed away from this prediction, reports Walter Gibbs in the New York Times. I asked Charlie to comment on this recent finding, here’s what he had to say:

“We can all remove one possible disaster scenario from our fears about global warming. The latest scientific evidence, coupled with more sophisticated computer climate modeling, doesn’t support a northern hemisphere plunge into a mini-ice age, as the Gulfstream current fails. Since the late ’70’s oceanographers have observed that the Gulfstream has periodically and dramatically varied in flow over the earth’s history, and that these variations are associated with major climatic shifts, like ice-ages. Such current fluctuations certainly could account for climatic shifts, since the North Atlantic current accounts for moving about 30% of the equatorial heat towards the poles significantly warming the northern latitudes, making Europe and North America more habitable. But a closer look has revealed that such a current failure isn’t all that likely. It would take a major catastrophic melting of the Greenland ice sheet, and that’s not in the earth’s current climate cards. So no “Day After” ice-age, we’ll all slowly warm instead.”

4 Responses to “Mini Ice Ages and the Evolving Nature of Science”

  1. John Schmitz says:

    Dude,
    This is really bad news. After watching “Day after Tomorrow”, I just got rid of my Oneill 3/2 wetsuit and replaced it with a gnarly 24 millimeter one. Now you’re telling me there’s no ice age coming? Dude, I’m bummed.

  2. marym says:

    Look on the bright side, now you can go surfing in Alaska.
    Mary

  3. peter jones says:

    Great blog Mary
    Found you through ‘Framing Science’.
    Noting your goals you may find the website and blog below of interest?
    Hodges’ model:
    http://www.p-jones.demon.co.uk/
    There are four knowledge domains inc. SCIENCES:
    http://www.p-jones.demon.co.uk/linksTwo.htm
    plus a blog:
    http://hodges-model.blogspot.com/

    All the best
    Peter
    P.S. Sorry url typos!

  4. Robert West says:

    If we have had five major ice ages and several mini-icw ages does that mean there have been at least that many instances of global warming? The last mini ice age ended about 150 years ago, about the time we started keeping track of tempature readings, would this explain our the current trend? After all if you have a thermometer and walk out of an ice-age with it, you would expect to see the mercury rise. What caused all those other global warming perriods? I don’t think it was dino’s tooling around in thier SUVs.

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