Another warming question

  1. fuzzyfelt

    fuzzyfelt 743
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    I am confused about much of the debates here about the earth getting warmer, but my daily experiences are that when it is an unusually hot or cold day people around me will joke about it being evidence for or against warming. A joke I think because the assumption is that a long term pattern of warming, despite particulars, is the evidence warming is based on. This was in the news yesterday, http://news.bbc.co.uk/1/hi/sci/tech/7376301.stm , that says things will cool for a couple of decades, but that that will change and meet up with warming predictions later. However, if things are not actually warming, how is this proof of warming?
     
  2. jcsd
    Earth sciences news on Phys.org
  3. There is enough proof!

    There is no reason to be confused, fuzzyfelt!

    Here are the proofs that I am aware of :-

    1)The average global temperature has been confirmed to rise by a degree at least every year.

    2)The Antarctic is melting drastically.

    3)Sea and Ocean levels are rising considerably every year.

    4) The Gangotri(the glacier that waters the Ganges) is melting down extremely fast.

    Moreover, logically why shouldn't the globe warm.The green house gases trap the heat and do not let out enough heat with proportion to how much it traps and this causes global warming.And these gases are none other than the familiarly emitted CO2, CO and methane. What about the ozone hole? This let's in infra - red rays which heat up the globe drastically. Isn't this proof enough?
     
  4. Well Ff, you raise a rather fundamental issue here. Can global warming still be true if it is actually cooling? Well, the warmers have the political power right now and if they decide so, what can we do?

    But to what extend will it be acceptable that they rewrite scientific philosophy, or philosophical science? In the old days we used to have a sort of scientific method. You'd observe some phenomena, you'd analyze those, formulating a possible explanation, a hypothesis, and using that explanation you would do predictions, what to expect if your hypothesis was to be right, in this case, an overwhelming effect of greenhouse gas forcing on global temperatures, as we read in the last two "summaries for policy makers" (2001, 2007). Then, if the prediction is right, the temperatue will increase as greenhouse gas concentration does. But if something else happens, like a dramatic cooling while the greenhouse gasses still rise, that would normally falsify this hypothesis.

    This used to be the main principle of classical science, falsification. But now we hear that, regardless if it is warming or cooling, the greenhouse global warming is true, no matter what, and no matter that the reality test failed. So it appears that we have to accept that the main classical scientific principle is no longer valid. The alternate, that the greenhouse theory is wrong, is absolutely unacceptable of course.

    Incidentely, the prolongued global cold spell does not only coincide with a reversal of the Atlantic Oscilation but also with a rather strong La Niña, an predicted reversal to the cold phase of the Pacific Decadal Oscilation and an equally predicted delay of solar sunspot cycle 24. The last prolongued minimum was the Dalton minimum of which Napoleon was very unhappy when his offense in Russia was smothered in an extreme cold winter. But this is all irrelevant of course if the global temperature is mainly dictated by greenhouse gasses, regardless if it warms or cools.
     
    Last edited: May 2, 2008
  5. But it has been noticed that the green house gases have not only caused warming but many other effects! I am not sure whether it is relevant, but it all seems to match perfectly.

    1) It has not snowed in many places in the USA this year.

    2)High levels of dust-storms in the whole of Gulf countries.

    3)Record temperatures of cold in many Northern cities in India.

    What do you say about that?
     
  6. russ_watters

    Staff: Mentor

    Did you misstate that? It's waaaay off.
    This one too, though I guess "considerably" could be subjective enough to mean several milimeters a year.
     
  7. Gokul43201

    Gokul43201 11,141
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    And it's not just data over a long period of time, but also data from a large number of locations.

    The observation of a specific cooling behavior over the next few decades can only confirm that the model that predicts this is likely to be a good model. This model has been discussed in another thread here (titled "Peer Reviewed Global Cooling") and says that global temperatures can be well approximated by superposing a 60-70 year cycle on a linear warming trend. Unfortunately, we can only be confident that the science is good after we've observed a number of these cycles. So far, we have good enough climate data that only goes back long enough to cover 2 cycles. With every additional 70 years we wait and every additional cycle that passes by (if they do), the stronger becomes our confidence in the model.

    No, it's not. Besides, your point #1 is off by at least an order of magnitude.
     
  8. DaleSpam

    Staff: Mentor

    Global warming is like intelligent design, they are both politically driven and non-falsifiable. If it get's hot, it's global warming and the US needs to pay, if it gets cold, it's global warming and the US needs to pay. "My non-linear unstable differential equation predicts disaster, damn the US". "You need to pay billions of dollars to stop CO2 emissions despite the fact that it is one of the weaker greenhouse gases!"
     
  9. Gokul43201

    Gokul43201 11,141
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    Can we please keep the thread about the science and save the socio-political commentary for threads in the Lounge?
     
  10. Of course, now is the time to evaluate what has been predicted in the past about the climate now, rather than what is predicted now. None of the models evaluated in the several IPCC reports has seen the current cold spell coming, likely because they were parameterized (if that's a word) for greenhouse forcing dominance.

    Anyway, things started to change already after the hot January of last year, when a moderate force La Nina started to devellop but the real temperature drop started mid December 2007, coinciding with an unusually quiet sun, now also the Pacific Decadal Oscillation (PDO) reversed to the cold phase. Several scientific signers of the occasional anti-AGW petitions have repeatedly pointed out that the PDO-index corrolates closely with global temperature variation, unlike the variation in greenhouse gasses.

    Anyway, the point is that the modellers have had several months time to contemplate these changes and adapt model parameters. So the resultant cold prediction looks more like a damage control retrodiction.

    But the first signs of a El Nino are there, we may have a nice summer after all.
     
  11. Addition, the Last summary for policy makers predicts (pag 12):

    See that there is no mention that natural variation may modify the decadal warming trend. Yet had the authors looked at all the combined actual temperature series in 2006 when the summary was drafted, then they might have come up with something differently. Now it was refuted already while it was drafted.
     

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  12. I'm amazed AGW is still even in the news. To summarise the faults found between the theory and observations we find,

    Prediction - Global temperature will continue to increase.
    Observation - No warming for the past 10 years and now even the proponents of AGW concede there will be no warming for at least the next 10 years and possibly even 20 - 30 years.

    Prediction - Massive sea level rise due to melting ice.
    Observation - The Antarctic ice pack which contains 90% of the world's ice is increasing in mass.

    Prediction - CO2 will create a positive feedback which will increase water vapor thus increasing GW.
    Observation - NASA's aqua satellite is showing there is actually a negative feedback with higher temperatures resulting in less water vapour creating cooling.

    It would seem scientists really need to go back to square 1 on all of this and start again from the beginning to build a theory which incorporates all of these new facts rather than desperately try to hang on to disproven hypothesis. They could call it anthropogenic global cooling; oh, but they've done that one already :)
     
    Last edited: May 6, 2008
  13. vanesch

    vanesch 6,236
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    I think - and the current observations and "on the spot" explanations seem to indicate this, that as of now, nobody actually knows for sure what's going on. It is the IPCC's fault of being over-arrogant, of considering that they "own the scientific consensus" and all that. In other words, it sounds like bad science, or at least, over-sold science.

    However, this doesn't mean that the central hypothesis of AGW has been proven wrong either. The possibility exists, and observations over one decade doesn't mean much. We're still in the noise, and we will for several decades. The climate models are still very crude. But in as much as fear-mongering (and doing bad science for the "good purpose") was an extremely bad idea, we also have to suppress the urge in the other direction, namely comply with our "don't worry, be happy" human nature, and declare that we have now proven that AGW is impossible, or even, that it leads to AGC. The system is just very complex, and most is not completely understood yet. AGW remains a possibility, in spite of it being over-sold by cock-sure arrogant scientists.
     
  14. Why, if wrong ideas about greenhouse mechanism are being falsified both by revisiting theory and real world observations? I hear that the scholar interest in the ideas of Ferenc Miskolczi has intensified largely the last week.

    The resulting post global warming straying hang over btw, will be tremendous, limiting myself to Earth sciences, a major clean up is required, from the multi million years Ice house - hot house flips, the Paleocene Eocene Thermal Maximum, the Pleistocene ice ages, the last glacial transition, all scholar ideas are based on enhanced greenhouse gas effect.
     
  15. "Observation - The Antarctic ice pack which contains 90% of the world's ice is increasing in mass."


    can you show a pointer to the study about this 'increasing in mass' observation?
    You are the first time I have heard someone make a claim about increasing ice mass.


    I really enjoyed watching 'An inconvenient truth'. The studies and charts are quite convincing to me.
     
    Last edited: May 6, 2008
  16. There have been suspicions since at least 2002 (eg http://www.springerlink.com/content/x15642536779n353/) that the Antarctic ice mass is increasing not decreasing . Here is a quote from a recent study.
    http://climatesci.org/2008/04/07/recent-data-on-surface-snowmelt-in-antarctica/
     
    Last edited: May 6, 2008
  17. wolram

    wolram 3,730
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  18. Gokul43201

    Gokul43201 11,141
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    Your "observation" is unrelated to your "prediction". Furthermore, it is flat out wrong. Warming over the last decade has been stronger than over the last 50 years. And your interpretation of the claims (though listed under "observation") is also at best, misleading.
     
  19. Perhaps not. Recheck this post
     
  20. Gokul43201

    Gokul43201 11,141
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    Andre you know that those linear trends are extremely sensitive to the '98 data point. What happens to the trend once you've established reasonable insensitivity to end-points? It is meaningless to speak of a trend otherwise.
     
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