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Date Weirdness

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In the Cooling Even section, there's a bit that uses the phrase "Before Present" ("In Greenland, the event started at 8175 Before Present"). Now, that's four significant figures. Over the lifetime of this article, present is going to shift quite a bit. Either someone's going to have to keep editing that figure, or someone needs to tie that to an actual date, I think. — Preceding unsigned comment added by 75.112.160.201 (talk) 07:05, 12 July 2015 (UTC)[reply]


BP refers conventionally to before 1950 in Geology-type fields. You are right that there is no justification for four sig figs though. Robbie Mallett (talk) 14:23, 28 November 2018 (UTC)[reply]

Comment

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Too much of this thing is unreferenced, or referenced to dubious sources (popular books) William M. Connolley 12:14, 22 August 2007 (UTC)[reply]

I understand that this article is about climatology, yet the dates given for this "event" c.6,200 BCE, has many consiquences for pre-history, and for the history of the entier world. Just a few examples thn theat are most likly VERY RELEVANT to this topic: All inhabited Continents were ravaged by a catastrophic mass exticntion know as the Megafauna extictions. The EXACT date for this is still under consideration, Evidence strongly suggests this mass extinction was concurrent with the simultanious collapse of all of the Northern Hemisphere Ice Sheets, the contaction of the Antarchtic Ice cap w/ the collapse of the West Antarctic Ice sheet. This resulonsted in a sea level rise of 300 to 400 ft.and the creation of the Bering Sea, the persian Gulf, the North Sea and English Channel, the Gulf of Chamby, and the globaPLINESl expansion of the worlds oceans by at least 25,000,000 sq miles. Lets remember that, according to MY calculations'Bold text', at least 50,000 TRILLION TONS OF ICE weight shifted away from the North Pole and into the oceans. Polar Sift anyone?s not limited I hold a degree in Ancient History from UC Berkeley and MA work at CSULB 2006 Bob from Berkeley (talk) 05:55, 6 March 2013 (UTC)[reply]

Would you name some sources, Bob? --bender235 (talk) 07:27, 6 March 2013 (UTC)[reply]

MY reseach is inclusive of MANY DISCIPLINES. The Megafauna extiction, the collapse of the Laurentide Ice Sheet, the flooding of Doggerland, Berringia, Mediterreanian, Caspian, Baltic, and Black Sea..etc,etc. all occur at about 8,200 years BP. This is not coinsidental. One specific source: The famous La Brea Tar pits in Los Angeles. The archaeology supports the dating of about 8,000BP for the LAST megafauna being trapped there including the giant Short Faces Bear. WHAT THEY NEVER ADVERTIZED? No specimens of California Grizzly or Black Bear fell in BEFORE c.5,000 BC. I am NOT researching a book, achedemic or otherwise! My agenda is to satisfy MYSELF and talk about MY results with anyone interested at ahmosis123@yahoo.com See you there:)

I'm sorry, Bob, but I did not mean those type of "sources". Please have a look at WP:RS for details. Wikipedia is not the place for your original research. --bender235 (talk) 08:00, 7 March 2013 (UTC)[reply]

Merge proposal

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The article Younger Dryas describes the same event better. Some of this text might be transferred there and then a #REDIRECT. Gabriel Kielland (talk) 21:22, 14 February 2008 (UTC)[reply]

Don't merge

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Incorrect! the Younger Dryas and the 8.2 kiloyear event were completely separate phenomena, 3000+ years apart. The Wikipedia entry on the Younger Dryas says nothing about the 8.2 kiloyear event.Ugajin (talk) 03:04, 15 February 2008 (UTC)[reply]

Ditto above, these are two different climatic fluctuations during the Holocene. I've added a couple of references of the top of my head to the article, in due course when I have more spare time I shall proceed to tidy up the article and add better references. AlexD (talk) 16:51, 17 February 2008 (UTC)[reply]

May we delete the merge proposal, since it was suggested in error?--Wetman (talk) 22:59, 20 February 2008 (UTC)[reply]
—I'd say yes. Ugajin (talk) 07:27, 21 February 2008 (UTC)[reply]

Other names

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The 8.2 kiloyear event (also known as Misox oscillation or Bond event 5) seems odd to me. Misox osc is barely known [1] and certainly doesn't deserve to be bold. Ditto Bond event 5. These are so non-notable hat I don't think they deserve to be mentionned to prominently William M. Connolley (talk) 21:31, 20 May 2008 (UTC)[reply]

Sorry, I didn't notice you comment. But I changed it anyway. —Bender235 (talk) 10:00, 22 May 2008 (UTC)[reply]

6th or 7th millenium...?

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If my calculation is correct then 7th millenium is in fact correct. BP is years before 1950 when calculating. So 8200 BP becomes 6250 BC - which is the 7th millenia (1BC-999BC is first). Did i miscalculate? --Kim D. Petersen (talk) 23:02, 22 May 2008 (UTC)[reply]

You're right. I was wrong. —Bender235 (talk) 00:09, 23 May 2008 (UTC)[reply]

Regarding sea level change during the 8.2k event

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This article mentions sea level dropping 14 meters in 200 years due to glacial advance during the 8.2k event. This claim is unreferenced and really quite unbelievable - that'd be two Greenland Ice Sheets worth of ice growth, and way beyond the sea level response that took place during the far more severe Younger Dryas. So I wonder what's the source for this claim?J.S.Salonen (talk) 11:28, 17 December 2008 (UTC)[reply]

Indeed, the sea-level drop story is non-sense. I edit it out. Estimate on sea-level rise based on lake volume (emptied) plus ice volume (decaying icecap washed into sea) is 0.4-1.2 meters. Direct sea level data collected around the worlds coasts, suggests it to be double that, but accurate sites are just starting to come in. I put in this reference: http://geology.gsapubs.org/content/38/3/275.abstract --Rennab (talk) 16:34, 6 March 2010 (UTC) - done --Rennab (talk) 17:35, 6 March 2010 (UTC)[reply]

Removed image - failed verification

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I've removed the graph [2], which i've tried to verify. Its not from Alley as claimed, and its not from Bond. Please fix up the reference on the image if its to be reinserted. --Kim D. Petersen (talk) 19:36, 2 June 2009 (UTC)[reply]

Bender, I'd guess. You can go back to File:Epica-vostok-grip-40kyr.png if you like William M. Connolley (talk) 20:44, 2 June 2009 (UTC)[reply]
The now (July, 2021) upper image is obviously intendedly cruelly scewed by statistical manipulation. There exists no icecore graph showing such temperature distribution. The lower image is noc much better.2A02:8108:9640:AC3:AD5F:2217:67F1:7B52 (talk) 09:58, 1 August 2021 (UTC)[reply]
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During several automated bot runs the following external link was found to be unavailable. Please check if the link is in fact down and fix or remove it in that case!

--JeffGBot (talk) 21:21, 19 June 2011 (UTC)[reply]

Updated with good link: http://www.climate.org/PDF/clim_change_scenario.pdf PeterWesco (talk) 04:49, 19 September 2012 (UTC)[reply]

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