Talk:Quaternary glaciation

message: Hi. I want to make an article specifically about the Pleistocene glaciation. Then, I hope it can be summarized in the article about the Pleistocene epoch. ~ UBeR 16:40, 13 August 2007 (UTC)
replies: text: Could please a real expert solve the contradictory times for the beginning of the pleistocene here versus that in the other special articles?? HJJHolm (talk) 10:07, 12 February 2009 (UTC)
thread_title: Start

message: Don't you mean million, not billion? Vegasprof 00:49, 6 September 2007 (UTC)
replies: text: Yes. Thank you. Feel free to change or delete anything you think is wrong. I hope to continue writing and expanding when I can, and eventually get it all referenced. ~ UBeR 23:52, 10 September 2007 (UTC)
thread_title: Billions of Years

message: I noticed that this page was vandalized, by replacing small, subtle words in the page with ridiculous alternatives, including changing the "last 2.5 million years" to 2 days. I have undone the vandalism. Has this been a problem in the past? 67.11.3.168 (talk) 20:48, 22 July 2008 (UTC)
thread_title: Vandalism

message: Has evidence been found for Pleistocene glaciation on the scale of the Laurentide ice sheet in the Southern Hemisphere? I'm trying to understand why horses (Equus scotti) died out more or less simultaneously in N. America and S. America about 10,000 years ago. --Virgil H. Soule (talk) 02:16, 10 October 2009 (UTC)
replies: text: It is very interesting to note that the rapid extinction of the megafauna of the Americas coincides with the arrival and spread of humans Quaternary_extinction_event#North_America at the end of the Pleistocene.  — Preceding unsigned comment added by Mzzl (talk • contribs) 13:14, 2 December 2013 (UTC)
thread_title:  Southern Hemisphere Laurentide 

message: If our glacial periods are caused by ocean access to the arctic ocean then they are caused by tectonic placement.  
Our lengthening glacial periods could be caused by the solar system exiting its cool period of orbit.  
Then it becomes harder and harder for the oceans to pile enough ice on land masses to lower their depth enough to halt the circulation of the arctic which causes the glacial period.
Our current increase in ocean circulation is cooling the oceans,   causing desertification similar to that in glacial periods. 
b. mcintyre  —Preceding unsigned comment added by 24.65.176.221 (talk) 14:02, 9 December 2009 (UTC)
thread_title:  lengthening glaciations 

message: Why is this in here: Global warming has exacerbated the retreat of these glaciers ? This is a theory, not a fact... even if it is cited with a source. If this sentence is going to be in the introduction, I think it should say something like The theory of global warming has exacerbated the retreat of these glaciers.  —Preceding unsigned comment added by Nvog86 (talk • contribs) 19:22, 21 December 2009 (UTC)
replies: text: If it's not warmer temperature, then what is it? With regards to your last sentence, theories do not cause ice retreat. ~ UBeR (talk) 18:45, 24 June 2012 (UTC)
replies: text:  1. Recent studies show that albedo changes alone can increase melt.  Soot from multiple sources (coal, nuclear test fallout from 900 above ground tests in the Russian north) has increased melting.  2. Mechanical action increases melt, similar to the effect of crushed ice vs cubed ice.  Storms and icebreakers increase mechanical melt effect in the seas.  Earthquakes and volcanic action under glaciers.  3. An increase in the transport of Arctic ice through the Fram strait into warmer waters has increased the melt rate of Arctic ice.  4. Finally the glacial detritus turnover rate lowers albedo of certain glaciers.  — Preceding unsigned comment added by 192.73.31.49 (talk) 22:12, 8 August 2013 (UTC)
thread_title:  Fact vs. Theory 

message: I added the following to the "effects" section:
*Ocean currents
**Thick glaciers were heavy enough to reach the sea bottom in several important areas, thus blocking the passage of ocean water and thereby affecting ocean  currents. In addition to direct effects, this caused feedback effects as ocean currents contribute to global heat transfer.
Hey, I know it's true, and the effect is alluded to in several places in the article, but I am not an expert and I do not not have any refernces. Can an expert please refine this and add references? -Arch dude (talk) 01:22, 4 January 2013 (UTC)
thread_title:  Ocean currents 

message: Why is there no clearly expressed time scale for this glacial period? When did it begin and when did it end? Kortoso (talk) 19:20, 4 September 2013 (UTC)
thread_title:  Time scale 

message: I removed the "Co2 glacial cycles 800k" graph from "Atmospheric composition" section because the stratigraphic terminology used in it is grossly antiquated, obsolete, and now known to be quite meaningless as I discuss in the . Before it can be used, this graph needs to be revised to remove the discredited terminology and have it replaced with the correct terminology. Paul H. (talk) 15:43, 17 November 2013 (UTC)
thread_title:  Removed graph from "Atmospheric composition" section 

message: In the section about the next glacial period, very specific time frames are listed for the onset of the next glacial period: 50ka if if CO2 levels increase to 750 parts per million, 15ka if CO2 drops to 210 ppm. What are the sources for these figures? I added the citation needed tag because figures this specific are probably based on a paper, but not mentioned in the references in this section. Both figures would break the trend of the past 1 million years, and it seems to me they would cause the next glaciation to be out of sync with the Milankovic cycles, so I'm very interested in the source. Mzzl (talk) 12:08, 2 December 2013 (UTC)
replies: text: These figures should be cited soon or deleted. I have looked for papers on this in the past, and they're very hard to find and very tentative. Pretty sure this section is misleading. Mujokan (talk) 12:06, 29 September 2015 (UTC)
replies: text:  This is the most recent article I know, published January of this year . It says that when they selected only the models that most accurately tracked the previous ice ages, using the pre-industrial levels of CO2 of 280 ppm (a bit more than the 240 ppm of the interglacial 800,000 years ago which is the closest model to the present of recent ice ages) they predicted that the next ice ages should be 50,000 and 90,000 years from now (with a possibility of a slowly approaching ice age 20,000 years from now). While with 240 ppm then the next ice age would be as soon as 1500 years into the future. Then, with 500 Gt of emissions, not far off what we have already reached, we may already have enough CO2 in the atmosphere to make a difference to the ice sheets over thousands of years. If it reaches 1000 GT then the chance of an ice age in the next 100,000 years is notably reduced and with 1500 GT of emissions then it is very unlikely that we get an ice age in the next 100,000 years. That's because when you add a new pulse of CO2, it drops off rapidly at first, half gone in 50 years, only a quarter left after 250 years, 15% after thousands of years and long term half life is 35,000 years. You can read it in full under Nature's sharing initiative if you click on the link " published in the journal Nature" in the article in the Guardian here: Fossil fuel burning 'postponing next ice age' Robert Walker (talk) 05:11, 30 November 2016 (UTC)
thread_title:  Next glacial period 

message: There hasn't been any changes to this article for a year and a half. I hope to make a number of changes - some may be large scale changes. If any contributors from the past have concerns let me know.
Mark Buchanan (talk) 23:00, 24 July 2014 (UTC)
replies: text: This article is specific to Quaternary, and most of the action is going on in the Ice Age section. The best I think we can do (who aren't specialists in this field) is to keep this page free of nonsense, and to maintain links to the Ice Age page where needed. So, that's what I've done.--Zimriel (talk) 02:58, 17 March 2016 (UTC)
thread_title:  General improvements 

message: What is the maximum thickness of the ice sheets during the Quaternary?  Regardless of extent the ice sheets never seam to have grown thicker than four kilometres (2½ miles).  Anyone who can verify this?
2015-01-10 Lena Synnerholm, Märsta, Sweden.  — Preceding unsigned comment added by 212.247.167.113 (talk) 19:00, 10 January 2015 (UTC)
thread_title:  Maximum thickness of the ice 

message: Is That serious work or something else? Thats a very serious questions. A lot of writing about clima is more political orientieted or colourd than something else. So here we have in the hole article just a very few facts = references! Thats not serious. We shouldnt make it as al gore - just words and no real evidences and propre science. Facts is waht we need - not blabla. And b.t.w.: During the Quaternary Period, the total volume of land ice, sea level, and global temperature has fluctuated initially on 41,000- and more recently on 100,000-year time scales, as evidenced most clearly by ice cores for the past 800,000 years and marine sediment cores for the earlier period. Thats not a propre sentence as we lern it in school. 1. You cant compare different scales together. volume and temperature are very different scales! Dont compare that!!! 2. The sentence it too long and especialy unclear. Thats not very serious work. My english is the 3 language, you can write me the corrections. greatings --93.184.26.78 (talk) 18:03, 2 September 2015 (UTC)
thread_title:  Serious work 

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thread_title:  External links modified 

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thread_title:  External links modified 

message: The date given in statement "The retreat of glaciers since 1850 is largely a consequence of anthropogenic warming of the climate system during the period." is unsupported by either citation given for it. I propose an alternate cite be found, or the statement be reworded to "The current retreat of glaciers is largely a consequence of anthropogenic warming of the climate system."  2001:56A:F564:3500:1DED:7A0E:DD59:B8C (talk) 20:14, 12 September 2016 (UTC)
thread_title:  Unsupported by cites 

message: This article is neutrally written and draws information from a variety of diverse, relatively current, reliable sources. However, there are a few reference links that appear to be broken, or don't lead to the intended source. It appears that reference #13 should apply to the formation of lakes as a result of glaciation, but instead links to a glossary page for the USGS that includes a heading regarding a volcano hazards program. Reference #16 links to the main page for the American Geophysical Union, not a specific relevant page or the information cited. Reference #28 links to a general paleoclimatology data page, but I could not find the info cited here. Also, some sections appear to be lacking citations. There are no citations in the "Discovery" section, the pluvial lakes section, or the ocean currents section. After the heading of the first two aforementioned sections, there is a link to a main article. I'm not sure if this is a sufficient/generally accepted way to support claims made in a separate article, but those sections may benefit from outside sources so that it is more clear where exactly the claims made and the facts displayed are coming from. JocA1 (talk) 21:28, 21 February 2017 (UTC)
thread_title:  Broken References & Potential citation issues 

message: In the Ocean Currents section there is very limited content along with a lack of citations, but it seems that the section is trying to get at thermohaline circulation. NOAA has an article here which describes how sea ice, which proliferated during the quaternary glaciation, drives ocean currents. Here is another article which details the possible feedbacks of the THC.
This brings me to another point, this article frequently mentions feedbacks, but presents incomplete information. Feedbacks are either positive or negative, and while some climate features have multiple feedback effects (e.g. water vapor) others, such as the ice-albedo feedback, are predictable and should be classified as positive or negative depending on the context. Thus, the statement on ice-albedo feedback should say that it is a positive feedback on cooling, because more ice will increase cooling through increased albedo. The same follows for CO2, as CO2 would rather be a negative feedback to cooling (or positive to warming).
Also, with regard to CO2, a crucial natural mechanism for CO2 concentration change is silicate rock weathering, which is unmentioned by this article. Silicate rock weathering is sometimes referred to as a thermostat because it reacts negatively to both warming and cooling, keeping climate in check. However, both uplift and glacial movement increase weathering, which acts as a positive feedback to cooling by lowering CO2 concentrations in the atmosphere.
Would appreciate any feedback on these comments before I attempt to edit.
LMPrudh (talk) 02:01, 23 February 2017 (UTC)
thread_title:  Reference/Additional Information 

message: The wording near the beginning of the article could be edited to be less confusing. The information under the "Effects" heading could use to be backed up by a reliable source, as there are several claims which are made about lakes that are not followed with any citation. Links 7, 13, and 16 do not lead to specific sources which back up any particular claim, but instead lead the user to a general page or homepage of the intended site. The majority of the rest, however, were accurate, unbiased sources which backed up the claims made in the body. The article does a good job of maintaining a neutral tone while giving enough detail for the reader to understand the material without being lost in a sea of unnecessary information. Jamesoneric (talk) 20:02, 28 February 2017 (UTC)
thread_title:  General Review 

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thread_title:  External links modified (January 2018) 

message: The Current Ice Age redirect was  turned into a stub in May 2018, and (rightly) turned back into a redirect in June.
However, the information added was lost. 
Apparently, it contained a suggestion for the early onset of glaciation as early as 33 Ma.
Afaics, this is simply a question of definition of when the "Current Ice Age" is taken to have begun (is a tiny sliver of ice in the Antarctic enough, or do we need a major Antarctic ice sheet?), but information on a possible early glaciation 33 Ma should certainly be included here.
--dab (𒁳) 06:56, 17 September 2018 (UTC)
thread_title: "Current Ice Age"

message: The German interlanguage link goes to Känozoisches Eiszeitalter.  That is the German page for the Late Cenozoic Ice Age.  The Late Cenozoic Ice Age began 33.9 million years ago and continues today.  The Quaternary Glaciation is the last 2.58 million years of it.
The interlanguage link between the Quaternary Glaciation page and the Känozoisches Eiszeitalter page needs to be deleted.  Then, a new interlanguage link needs to be created to link the Late Cenozoic Ice Age page to the Känozoisches Eiszeitalter page.
Here are the addresses for the two pages that need to be linked with an interlanguage link:
Late Cenozoic Ice Age (English page)
http://en.wikipedia.org/wiki/Late_Cenozoic_Ice_Age
Late Cenozoic Ice Age (German page)
http://de.wikipedia.org/wiki/Känozoisches_Eiszeitalter
Appple (talk) 01:43, 01 October 2018 (UTC)
thread_title: German interlanguage link goes to wrong page

message: https://gml.noaa.gov/webdata/ccgg/trends/co2_data_mlo.png 
https://gml.noaa.gov/webdata/ccgg/trends/co2_trend_mlo.png Ocdncntx (talk) 18:15, 25 June 2023 (UTC)
thread_title:  The CO2 level charts are grossly out of date.  Modern and continuously updated charts are available from noaa.gov.