Thanks Hermion,
It's nice to see progress being made in this area. As lets not forget, Mike Baillie first postulated that the ice cores were wrong in the 6th century in 2008. With the AD 774 and 993/4 cosmic events, the ice core workers have had a way to independently evaluate their chronology with respect to trees and historical record.
Jonny
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Jonny McAneney
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Laboratory
This is the interesting information I was privy to <;. A little delayed, but it got there in the end.
Jonny
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Jonny McAneney
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Ancient History
New research published today in Nature shows that the ice cores are indeed too old in the 1st millennium as indicated by Mike Baillie and myself.
Sigl et al. have used the two cosmic events at AD 774 and 993 which produced excess 14C in precisely dated global tree rings, and 10Be in ice cores, to constrain the NEEM core chronology, and confirms that the ice cores are too old by 7 years b
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Jonny McAneney
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Laboratory
I dont have any strong feelings on it either way. The old wood explanation seems plausible enough. Dating charcoal is always risky business, since all it tells you is the age of that part of the tree when it was burnt. I dont know enough about Egyptian chronology to comment otherwise, but I would have no contention with its current dating, or even if it was redated to a few centuries earlier.
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Jonny McAneney
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Ancient Egypt
No problem i have been an expert of the art of procrastination today!
Jonny
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Jonny McAneney
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Ancient Egypt
I am not sure what models you are referring to, and with respect to Egypt, but I will try to answer as best I can and hopefully it will cover your question.
Regarding tree rings, there are as far as I can recall, 4 long and continuous. The longest is the German chronology that extends back 12,410 years in total. This chronology is composed primarily of oaks, but far back it also contains Preb
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Jonny McAneney
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Ancient Egypt
Porter raises the question "have Belfast and if so, by a large amount or a small amount? Unless the German dendrochronologists (or possibly the Americans) make their data available, there is no way to check. The low Egyptian historical chronology should not be ruled out until dendrochronologists, particularly German dendrochronologists, provide some evidence that their work is correct back
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Jonny McAneney
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Ancient Egypt
I inow what you mean Tommi about keeping track of things. A few months ago i discovered something i thought to be interesting and was quite excited about it. Later I went to make notes on it so i would have it to hand, on,y to find that when i opened my note file that i had already discovered it a couple of years before and made notes on it then. it all must have dropped out of my head to make
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Jonny McAneney
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Laboratory
Its known as the Oligodynamic effect. See here for more info.
Jonny
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Jonny McAneney
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Laboratory
Thanks Tommi, it should be interesting to see how the chronology community react.
Jonny
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Jonny McAneney
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Laboratory
Thanks Hermione. Fingers crossed.... any interest, negative or positive would be good. No such thing as bad publicity and all that.
Jonny
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Jonny McAneney
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Laboratory
I am privileged to be given a guest blog spot on RealClimate blog.
The post can be viewed here
Jonny
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Jonny McAneney
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Laboratory
One of the issues that we had with the dating of the 934 Eldgja, was that it appeared initially to be correct. As we discuss in the paper, frost rings in bristlecone pine, can be indicative of a large explosive volcanic eruption, and of course, as nature would have it, there is a frost ring at AD 934. So we naturally thought that this eruption may have been correctly dated by the GICC05 timesca
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Jonny McAneney
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Laboratory
In a similar vein, how would a low altitude airburst effect the ice?
Jonny
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Jonny McAneney
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Laboratory
I am not aware of anything in the poetic side of things (but then I didnt look). On the history side of things Stothers did a good job at reviewing the Icelandic historical records here . He leans more towards the 934 date, but this I believe is influenced by the European ice core suite, which we believe the error exists in.
Jonny
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Jonny McAneney
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Laboratory
The paper has finally passed through peer review and was published this morning here
There has been some change to it during the review process, with further development of the discussion questioning the ice core dating of the Eldgja eruption in the 930s, suggesting that the error in the ice cores occurs somewhere above this.
Jonny
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Jonny McAneney
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Laboratory
It probably means "clueless"
Jonny
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Jonny McAneney
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Laboratory
I have encountered some papers in the past with authors whose genuine names when pronounced in english are quite fun. My two favourites are from the far east. Dr Ichinose and Dr Sakashita. Nominative determinism could be involved
Jonny
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Jonny McAneney
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Laboratory
See usoskin et al 2013 Astron. Astrophys., 55, L3, doi:10.1051/0004-6361/201321080, for the ice core stuff. There is elevated 10Be in the ice cores which forms coincident with radiocarbon During high energetic cosmic events. The amount found is in direct accord with the degree of measured radiocarbon excess, and is suggestive of a solar proton event or supernova.
Jonny
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Jonny McAneney
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Ancient History
Short answer is no. Interstellar clouds are extremely spacially large compared to the solarsystem, and so we would take centuries to traverse it and this radiocarbon excess event occured within 1 year.
Jonny
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Jonny McAneney
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Ancient History
Its not very relavent to this. The apparent periodicity of extinctions in the fossil record, if real, has been attributed to many things, one of the more plausible being tidal disruption of the oort cloud as the solarsystem passes through the galactic plane of our galaxy. This diruption then sends a swarm of comets to the inner solar system, increasing the chances of impact with earth.
The
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Jonny McAneney
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Ancient History
I can neither confirm nor deny that it is to do with Alien Mind Control rays... my beneficent galactic overlords cannot not comment at this time.
Jonny
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Jonny McAneney
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Ancient History
It is not an increase in CO2 that is measured, but rather an increase in the amount of radiocarbon produced in the atmosphere, that then enters the carbon cycle.
The current favoured hypothesis to explain this event is a massive Solar proton Event or a series of smaller ones, not an impact.
On an additional note, i am privy to some interesting information relating to this event, but I a
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Jonny McAneney
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Ancient History
Looks like that link is now dead. Also it appears i was wrong... They did lock it to members only
The talk is available on youtube if you search for Quantum man: Richard Feynman's life in science
Jonny
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Jonny McAneney
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Laboratory
Feynmans lectures on physics are now available for free online.
Jonny
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Jonny McAneney
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Laboratory
The video is just a teaser for the actual documentary which is on air on the 7th July in America. I asked Patrick McCafferty if and when it would be available in teh UK, but he didnt know. He said it will be on the irish TG4 channel in the Autumn, so it might follow in the UK around teh same time. Until then it might appear on YoutUbe or other video website.
Jonny
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JonnyMcA
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Ancient History
For those in the US you can watch this documentary with some interesting ideas
I havent seen it so cannot comment on its production value, but Patrick McCafferty has some great ideas. I wouldnt put much stock in the segments with Dallas Abbott though as i dont find her work on the ice core chronology convincing.
Jonny
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JonnyMcA
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Ancient History
It is still not clear as to which volcano you are refering to... i.e. at which date?
But yes, each volcano has a particular chemical signal, but some of the signals can be quite similar. It would also involve identifying tephra in the ice for chemical analysis. So in principal if you have tephra you can try to link it to a volcano that is known to produce that tephra. In practice this is
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JonnyMcA
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Laboratory
What culprit are you referring to specifically? Regardless the easy answer is we havent.
Jonny
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JonnyMcA
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Laboratory
Oh no, congratulate away.... im not ashamed to have the old ego stroked
One thing worth noting though, which is a merit to the journal in some regards, is that we are publishing in a hostile journal. I say hostile, because two of the editors (one of them being the chief editor) are the top ice core workers whose work we are attacking. So we kept expecting to be shot down before it even got
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JonnyMcA
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Laboratory