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Climate Sensitivity to Carbon Dioxide Highlighted by Ancient Event
9 December 2006
Global warming 55 million years ago suggests a high climate sensitivity to carbon dioxide, according to research led by Mark Pagani, associate professor of geology and geophysics at Yale and published in the December 8 issue of Science.
For some years, scientists have known that a massive release of carbon into the atmosphere caused the ancient global warming event known as the Paleocene-Eocene Thermal Maximum (PETM) that began about 55 million years ago. The geologic record shows that the resulting greenhouse effect heated the planet as a whole by about 9° F (5° C), in less than 10,000 years.
That temperature increase lasted about 170,000 years, altered the world’s rainfall patterns, made the oceans acidic, affected plant and animal life in the seas and on land, and spawned the rise of our modern primate ancestors.
The PETM is a stunning example of carbon dioxide-induced global warming and stands in contrast to critics who argue that the Earth’s temperature is insensitive to increases in carbon dioxide. Not only did the Earth warm by at least 9° F (5° C), but it did so during a time when Earth’s average temperature was already 9° F warmer than today.
—Mark Pagani
However, what has not been clear is how much carbon was responsible for the temperature increase and where it came from. Scientists have speculated that it might have come from massive fires from burning coal and other ancient plant material, or from burps of methane from the continental shelves that rapidly became atmospheric carbon dioxide.
According to this work, if the PETM was caused by the burning of plant material then climate sensitivity to carbon dioxide is more than 4.5° F (2.5° C) per carbon dioxide doubling. And if methane was the culprit, then Earth’s climate must be extremely sensitive to carbon dioxide—increasing, over 10° F (5.6° C) per carbon dioxide doubling.
—Mark Pagani
This finding contradicts the position held by many climate-change skeptics that the Earth’s climate is resilient to such carbon dioxide emissions and suggests that Earth’s temperature will rise substantially with atmospheric carbon dioxide concentrations that are expected to double around mid-century.
The last time carbon was emitted to the atmosphere on the scale of what we are doing today, there were winners and losers. There was ecological devastation, but new species rose from the ashes. Our work provides even more incentive to develop the clean energy sources that can provide for economic growth and development without risking the natural world that is our endowment.
—Ken Caldeira, a co-author from the Carnegie Institution’s Department of Global Ecology
Other authors on the paper include David Archer in the Department of Geophysical Sciences, University of Chicago, and James C. Zachos in the Earth Sciences Department, University of California, Santa Cruz.
Resources:
“An Ancient Carbon Mystery”; Mark Pagani, Ken Caldeira, David Archer, James C. Zachos; Science 8 December 2006: Vol. 314. no. 5805, pp. 1556 - 1557 DOI: 10.1126/science.1136110
December 9, 2006 in Climate Change | Permalink | Comments (28) | TrackBack (0)
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Posted by: Engineer-Poet | December 13, 2006 at 10:01 PM
(part 2)
Who can disprove this if one has shifted to the realm of the 'super-natural'?Prove that this realm exists and has observable effects first. Whoops, that's probably a violation of your special rules of natural theology or whatever you call it.
As for predictive power, yes, you're absolutely right: naturalistic/modern evolutionary theory has predictive power. No doubts about it. So does every other theory.Is that so? What predictive power did Plato's "noumena" have? Could you get through steps 3, 4 and 5 with it?
Creation science also has enormous power to predict.Does it tell you what you're going to find next, and where?
I'm amazed that you're still claiming the geologic column as a problem for conventional theory.
Speak of the logical and physical impossibility of the column holding any credence after these finds of hundreds of polystratic fossils. They very strongly infer the strata are laid down rapidly.The "uniformitarians" have a very simple explanation for these things: some strata were laid down rapidly. But not by supernatural events; they were laid down by floods, mudslides, volcanic eruptions and other things we see going on to this very day. A flood can deposit several feet of material at once, no problem. But it only happens in the area of a floodplain, and later erosion usually removes the material again. Only when water levels are rising (or the land is sinking) do further deposits cover the flood sediments and have the potential to fossilize the evidence for posterity.
This is not a cherry-picking fringe argument: this is the bible of evolution: the geological column. When foundations are unearthed, the structures that rest on them are shaken; sometimes they collapse. Sounds like someone here is scared of this.Keep telling yourself that, you'll have a better future... as a comedian.
if it's merely objective science it should welcome the scrutiny. Isn't that the way science advances?Not when folks like you make religious claims to your own facts, like "God stepped in here and changed it, and conveniently didn't leave any evidence."
Today it is still only supported by circular reasoning. The rocks layers determine the date of the fossils, but the fossils date the rocks. ???Wrong. The sequence determines the rough date (older layers below, newer above... unless you REALLY think God is a liar and shuffled them like a deck of cards!) and the fossils determine which layers are contemporaneous. And if flood geology is so scientific, why is it that all the radioisotope dating systems (e.g. potassium-argon dating [4]) agree with the standard geological dates and not your flood geology?
Even when rough dates for those strata were determined before radioactivity had even been discovered?
Ironies abound:
In the water all the trees that got blasted clean off the mountain were piled up in the water, they started to saturate, go end down slowly into the mud and rotting bark and other debris which is naturally stratifying via hydrologic sorting....Hydrologic sorting means the heavier, coarser material always winds up below the lighter, finer material. If the whole geologic column was hydrologically sorted, one would never... could never... find e.g. a sandstone on top of a shale. Muds, silts and clays always sort above sand and gravel. (In the Grand Canyon, the Coconino sandstone lies atop the Hermit shale [5]. And how do flood geologists explain all the different layers of limestone, which should all have sorted together?) But let's see a criticism of Kent Hovind [6]:
Absolute rubbish. The hydrologic sorting idea was put forward by Young Earth Creationists to explain stratification as well as fossil distribution in a global flood scenario. Even if there were tides they would not disturb anything greater than the immediate surface. Secondly if such an absurd deep disturbance did occur then the sorting would be based upon density, which is not what has occurred.Anyone who cares to read through the above link will note that it contains John W.'s entire thesis and also a complete refutation. There is much more at [7] and [8].You can get a jar [of mud] out of your yard here, put some water in it, shake it up and set it down it will settle out into layers for you. Hydrologic sorting.
But notice these layers are based upon density. Is there ever a heavy layer on top of a light layer?Contradiction It is interesting that Hovind is asking people to perform an experiment then assume that the same properties applied in the past, in other words, he is relying on uniformitarianism but Hovind has above declared this concept to be in error.
But no, John, I don't hate you. I'm sure you mean well, but you are far too credulous for anyone's good. "Hate the sin, love the sinner." Just go forth, and lie no more.
[4] http://archserve.id.ucsb.edu/Anth3/Courseware/Chronology/09_Potassium_Argon_Dating.html
[5] http://www.kaibab.org/geology/gc_layer.htm
[6] http://www.kent-hovind.com/evolution/evolution.htm
[7] http://wiki.cotch.net/index.php/Fossils_sorted_hydrologically
[8] http://www.geocities.com/SouthBeach/Pier/1766/hovindlies/E.html
Posted by: Engineer-Poet | December 13, 2006 at 10:02 PM
I have always conceived of the God of the Bible as an engineer before he is a king. Unlike any other king, he is the maker of his realm, and as a perfect being, he must clearly put perfect thought into perfect design and then into perfect form. I admit that I believe in the creation story, if just not quite the timeline that is literally associated with it by young Earth creationists. For certain reasons, reasons I won't go into, I can conceive of how it is possible.
Posted by: Biblical Events Timeline | August 28, 2008 at 07:09 PM
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Note: The spam filter will not let me post a full response with hyperlinks to all the reference material. As a consequence, I've had to break the comment into pieces and change the links to plain text; I've moved them to footnotes to avoid disrupting the flow.
As I said before, John, W., I don't have a problem with your religious beliefs. I have problems with you lying. And you tell quite a few whoppers, like this one:
So that's why you came in here and said that the scientific data behind this event, and implicitly every geological date ever determined by anyone other than young-earth creationists, is bogus?It is to laugh.
The same is true about your claim regarding the scientific method. Since I'm an engineer and not a scientist, I'll just let Lenny Flank [1] (who was posting on the site where you should have moved your part of this discussion) have the floor for this one:
Lying isn't a very Christian thing to do, is it? Is there a "for the sake of the faith" exception?
You seem to be practicing the "Gish gallop", posting falsehood after falsehood too voluminous to refute. But I'll select a few more of your lies for review here.
And of course, you can't reconcile that with making testable predictions, looking for observations to test those predictions (blasphemy!) and modifying your hypothesis until it fits the observations (heterodoxy).It's in Baja California, just where you'd expect it. I found some pictures [2] and a satellite view from Google maps [3].
Did someone tell you the Colorado river delta didn't exist? And you believed them? Maybe you're not a liar, maybe you're just extremely gullible.
[1] http://www.pandasthumb.org/archives/2005/12/cooper_nelson_s.html#comment-64516
[2] http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=4732
[3] http://maps.google.com/maps?q=%22colorado+river+delta%22&ie=UTF8&oe=UTF-8&client=firefox&z=10&ll=31.889219,-114.976044&spn=0.797555,1.501007&t=k&om=1