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Originally posted by Muaddib
First of all proof of climate changes of the past, and even abrupt climate changes is not primarily based on ice core analysis.
Description
The climate record for the past 100,000 years clearly indicates that the climate system has undergone periodic and often extreme shifts, sometimes in as little as a decade or less.
Just do a search on the RWP Essan, it is common knowledge that event did not last as long as the MWP or the current warming cycle...
Originally posted by Essan
Much higher? Data please? I know many places experienced higher temps during the Holocene Climatic Optimum (c10-6kya) - although it seems not all places at the same time. I'm not aware for evidence of significantly higher temps since.
....i have given data from Africa, North America/Canada, Japan, China, and several European countries in which these events were recorded in the geological record as having occurred at about the same time globally....
The five-hundred-year reconstruction is characterised by a temperature increase of approximately 0.5 K, with most of the warming occurring in the 19th and 20th centuries. The 17th century was the coolest interval of the five-century reconstruction.
The warming of Australia over the past five
centuries is only about half that experienced by the continents of the Northern Hemisphere in the same time interval.
Following the train of thought of the AGW crowd i guess the above proves that the current warming event is not global huh?....
Originally posted by Muaddib
And if we look at both temperature and CO2 levels for the last 100,000 years, we see that CO2 lags temperatures, sometimes the lag is 80 years, sometimes the lag is 800, and as I remember the longest lag has been 1,200 years. Why does the lag of CO2 differ so much between Climate Changes?
BTW, one more thing, you always seem to forget that there have been some natural factors which affect the climate and are happening now, but the last time they happened was over 780,000 years ago.
I am talking about the weakening of the Earth's magnetic field, the last time the Earth magnetic field was as weak as it is now was around 780,000 years ago.
That is just an example of a factor which does affect Climate Change and it hasn't happened for at least 780,000 years.
Originally posted by Essan
No? What other proxies do we have then?
Originally posted by Essan
I guess based on records from the paleolithic met office is it?
Or, just possibly, it's a reference to Alley's ice core analysis
Originally posted by Essan
I'm not talking about duration - I'm asking why you refer to it as an example of Abrupt Climate Change.
Originally posted by Essan
Er, my question was evidence of such warming subsequent to the mid Holocene ..... Or are you saying you have data showing that all of these regions have experienced higher temps than today during the RWP or MWP?
Originally posted by Essan
Actually, I'd say it's a predominantly N Hemisphere event Largely because the S Hemisphere is dominated by ocean and Antarctica.
Originally posted by Essan
But none of this answers my questions about abrupt climate change. You have provided no evidence for abrupt climate change other than ice cores, no evidence of research into such matters other than that carried out by those who support AGW theory, no evidence for non catastrophic causes of it, and no evidence that the RWP and MWP saw warming occur at a faster rate than today.
Originally posted by Essan
All in all, the whole side issue of Abrupt Climate Change is a red herring. And it's main relevance in modern climate discussion revolves around the possibility of catastrophic ice melt in the Arctic causing a repeat of the 8.2 kya event occurring in the near future!
Originally posted by Muaddib
You are presented with evidence which destroys your religion, because that's what it appears to be, and you try to dismiss it and will probably continue to try to dismiss it until the day you die.
Originally posted by Essan
Well we do have to assume that ice core analysis is correct - especially given that most of those involved in it also support AGW - so their reliability might be in question
Originally posted by Essan
But seriously, I thought everyone knew that temp can affect CO2 and CO2 can affect temp - change one and the other changes.
Originally posted by Essan
Now, it's possible on that basis that current rises in CO2 - as in the past - are caused by rises in temp. But in that case, where is all the extra CO2 being produced by human activity going? And, indeed, why is CO2 rising ahead of and faster than temp?
Originally posted by Essan
In other words, the scale isn't sufficient to show the difference between an ice age and an interglacial. So why show it? We all know that temp and CO2 are affected by things like continental configuration and solar brilliance and when these were totally difference, so too were temp and CO2. But what's the relevance of showing changes on timescales of millions of years when we're talking timescales of decades?
Originally posted by Essan
The fact that there was a different relationship between CO2 and temp when there were no living things on the planet and the sun's output was half what it is today really doesn't have the slightest, teeniset, weeniest bit of relevance
Originally posted by Essan
Unfortunately we don't have any [proxy data to determine whether the last magnetic reversal affected climate, or if so, in what ways. So I'm not sure why you mention this?
Geomagnetic Links to Climate Change and Orbital Cycles
Abstract
Years of speculation, newly recognized mechanisms for interactions, and a sparse but expanding number of observations support some form of link between geomagnetic field variability and climate change and/or orbital cycles.
...........................
Originally posted by Essan
I think Melatonin makes a good point about CO2 levels though - I'm sure I may have mentioned it myself on past occasions too - if CO2 is linked to temp, why did CO2 levels not rise when it was warmer during the RWP and MWP? Or, indeed, as I'm sure I've asked before, during the early/mid Holocene when even AGWites like Hansen acknowledge it was at least as warm as today?
The only explanation is that current CO2 levels are determined by human activity.
Originally posted by Essan
Which in turn means that, unless we can prove Arrhenius wrong, temps should also be rising.....
Originally posted by Essan
I used to call myself a Climate Sceptic -
..................
Originally posted by Muaddib
Originally posted by Essan
Well we do have to assume that ice core analysis is correct - especially given that most of those involved in it also support AGW - so their reliability might be in question
That's a claim of yours which you have yet to present proof that you are right...
Originally posted by Essan
But seriously, I thought everyone knew that temp can affect CO2 and CO2 can affect temp - change one and the other changes.
I thought everyone knew that CO2 do not affect temperatures as much as you and some others claim... such as the fact that imitating conditions in the U.S. midwest and doubling CO2 to 760 ppm would only increase temperatures by a whooping 0.014C...
Originally posted by Essan
Now, it's possible on that basis that current rises in CO2 - as in the past - are caused by rises in temp. But in that case, where is all the extra CO2 being produced by human activity going? And, indeed, why is CO2 rising ahead of and faster than temp?
Oh my, oh my...where has all the CO2 gone to in the past?... if CO2 wasn't absorbed by the oceans, lakes, soil, trees, bamboo, etc etc we would be having over 7,380 ppm of CO2 in the atmosphere right now wouldn't we?
If CO2 does the warming you and some others claim it does then it wouldn't matter how many million of years ago it was that CO2 levels were higher than they are today...tempreratures should be increasing dramatically as well...
Why was it that during the 1940s, during the height of weapons production and WWII that temperatures were cooler meanwhile CO2 levels were increasing?....
Originally posted by Essan
Unfortunately we don't have any [proxy data to determine whether the last magnetic reversal affected climate, or if so, in what ways. So I'm not sure why you mention this?
Really?.....
Geomagnetic Links to Climate Change and Orbital Cycles
Abstract
Years of speculation, newly recognized mechanisms for interactions, and a sparse but expanding number of observations support some form of link between geomagnetic field variability and climate change and/or orbital cycles.
...........................
Originally posted by Muaddib
I kind of doubt anyone could be a "climate skeptic". You doubt the climate?
Originally posted by Muaddib
I have already awnsered that question before... It is for the simple fact that there must be other factors linked to Climate Change which control CO2 levels.
Originally posted by Essan
As you well know the idea of Abrupt Climate Change originated with Richard Alley's analysis of the Greenland ice cores. Alley contributed to the IPCC 4AR on this very subject.
Originally posted by Essan
I'm not personally aware of anyone who has studied ice cores who directly refutes AGW theory.
Originally posted by Essan
Not aware of that research - but that's one small part of one small region of the world - and we all know that global warming doesn't mean that everywhere necessarily get warmer.
Originally posted by Essan
btw if what you say is true, it suggests even more strongly that human activity is directly responsible for late 20th century warming in the USA - re Minnis etal 2003 - aircraft contrails could explain all the observed warming, and if we assume on this basis that increased CO2 doesn't then it seems even more likely.
Originally posted by Essan
Ah yes, the carbon cycle. Which one can add to without having any effect eh? Anyway, if extra human produced CO2 is so absorbed, why isn;t the extra CO2 released by the oceans in accordance with the 'CO2 first' theory?
Originally posted by Essan
We know that more CO2 is being released from somewhere than can be absorbed, because CO2 levels are rising. We know that humans are releasing more and more CO2 every year. Doesn't take a genius to put 2 and 2 together.
Originally posted by Essan
No, becasue other factors were different. Without current CO2 levels in the past global temps would have been much, much colder because the sun was colder ....
Originally posted by Essan
Sulphur emissions and other pollution - which had a cooling effect greater than the warming effect of the CO2. However, CO2 lasts longer in the atmosphere and we've recently reached the stage where the warming effect of CO2 finally outweighs the cooling effect of sulphur etc.
Originally posted by Essan
"some form of link" "and/or orbital cycles" - hardly conclusive
(I actually think you're likely to be right. But I don't think there's sufficient evidence to say so)
New investigations of a tiny star in the constellation of Pegasus have provided a novel insight into the Sun and its potential impact on Earth.
An international team of astronomers[1] have developed a new understanding of how stars, including the Sun, generate their magnetic fields. The new finding may help develop further understanding of how changes in the magnetic field of the Sun impact on Earth's climate. The researchers from France, Scotland and the USA made a crucial discovery when studying a small ultra-cool star 20 light-years from the Sun. The researchers used new methods to make the first magnetic map of the star, and found that this ultra-cool star has a very simple magnetic field, much like that of the Earth.
They explained: "Studying magnetic fields of stars is a novel way of studying the magnetic field of our Sun. Although it always looks the same, the Sun is variable, and the changes in its magnetic field, although small, appear to affect the Earth's climate. Scientists think that a well-documented decrease in the Sun's magnetic activity is the most probable cause of the Little Ice Age, the cool period that prevailed on Earth from the 15th to the 18th century."
The star, named V374 Pegasi, lies about 20 light-years from the Sun, in the constellation of Pegasus. Although it is one of the Sun's closest stellar neighbours - much nearer to us than most of the stars visible in the night sky - V374 Peg is more than 100 times too faint to see with the unaided eye. It is an ultra-cool star, one-third of the size of the Sun, with a surface temperature of only 2900 C, in contrast to the Sun's 5500 C.
Originally posted by Muaddib
Have you already forgotten the research done for 6 years which shows cirrus clouds are decreasing instead of increasing?
High flying aircraft also can form cirrus clouds if they persist long enough, and the AGW crowd claimed because we have more aircraft flying this would cause more warming, yet the oposite is happening.
Since after the past three deglaciations there has always been warming which has been on going for a few hundred years, and then CO2 levels increased "naturally up to 100 ppm", and since the Earth just came out of another deglaciation after the LIA, "it does not take a genious to realize that the increase in CO2 levels which happen to be 100 ppm, is mostly natural, since that's exactly what has happened during the last 3 deglaciations.
Nope, first of all you still have given any evidence that CO2 causes the warming that you and some others claim it does.
Essan, we know for a fact that the Earth's magnetic field is in a weaker state which Earth hasn't experienced in 780,000 years,
www.dailytech.com...
My earlier column this week detailed the work of a volunteer team to assess problems with US temperature data used for climate modeling. One of these people is Steve McIntyre, who operates the site climateaudit.org. While inspecting historical temperature graphs, he noticed a strange discontinuity, or "jump" in many locations, all occurring around the time of January, 2000.
These graphs were created by NASA's Reto Ruedy and James Hansen (who shot to fame when he accused the administration of trying to censor his views on climate change). Hansen refused to provide McKintyre with the algorithm used to generate graph data, so McKintyre reverse-engineered it. The result appeared to be a Y2K bug in the handling of the raw data.
Originally posted by Muaddib
BTW melatonin...
I prefer this sort of graph....
Originally posted by Long Lance
if this is true, which should be easily established with a bit of patience, the whole AGW argument has been demolished to its core, however.
Originally posted by melatonin
Why?
Originally posted by Muaddib
hummm, i don't know...perhaps it has something to do with the fact that because it shows the persistent Solar Influence on North Atlantic Climate During the Holocene?.... but instead of course melatonin wants to show us a graph for Paris as if that proves his point...
Originally posted by Long Lance
you might be interested in the latest alledged revision of climate data, which apparently went unreported by the media.
Proc Natl Acad Sci U S A. 2006 June 13; 103(24): 8937–8942.
Published online 2006 June 1. doi: 10.1073/pnas.0603118103.
Copyright © 2006 by The National Academy of Sciences of the USA
Geology
Solar modulation of Little Ice Age climate in the tropical Andes
P. J. Polissar,*† M. B. Abbott,‡ A. P. Wolfe,§ M. Bezada,¶ V. Rull,‖ and R. S. Bradley*
*Department of Geosciences, Morrill Science Center, University of Massachusetts, Amherst, MA 01003;
‡Geology and Planetary Science, University of Pittsburgh, Pittsburgh, PA 15260;
§Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, Canada T6G 2E3;
¶Departamento de Ciencias de la Tierra, Universidad Pedagógica Experimental Libertador, Avenida Paez, El Paraíso, Caracas, Venezuela; and
‖Departament de Biologia Animal, Vegetal, i Ecologia, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
†To whom correspondence should be sent at the present address: Department of Geosciences, 411 Deike Building, Pennsylvania State University, University Park, PA 16802., E-mail: [email protected]
Communicated by H. E. Wright, University of Minnesota, Minneapolis, MN, April 17, 2006.
Author contributions: M.B.A., A.P.W., and R.S.B. designed research; P.J.P., M.B.A., A.P.W., M.B., and V.R. performed research; P.J.P., M.B.A., M.B., V.R., and R.S.B. analyzed data; and P.J.P., M.B.A., A.P.W., and V.R. wrote the paper.
Received June 20, 2005.
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During the past millennium, significant climatic fluctuations have occurred. Prominent among these is the Little Ice Age (LIA), recognized in historical records (e.g., ref. 1) and documented in proxy climate records from many locations (2). Although the LIA was a significant global event (3), its causes and regional differences in the timing and climatic response remain unclear (2, 4). This uncertainty is particularly true in the tropics, where well dated records with sufficient temporal resolution to resolve decadal changes in climate are sparse (2). Better knowledge of tropical climate during the LIA will help determine its causes and aid in the prediction of future climatic change.