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Keyword: iceages

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  • Ice Age-Era Fossil Given to Museum After Disappearing From Aptos Beach

    05/31/2023 1:02:35 PM PDT · by nickcarraway · 17 replies
    KSBW ^ | May 31, 2023 | Christian Balderas
    An adult mastodon tooth that was spotted at Rio Del Mar Beach near Aptos Creek is now in the hands of paleontologists in Santa Cruz. The foot-long tooth was found by Jennifer Schuh while walking the beach on Friday. Not knowing what it was, she snapped a few photos, posted them on social media and left it on the sand. That caught the attention of paleontologist Wayne Thompson at the Santa Cruz Museum of Natural History. "He called me and told me what it was and I rushed back, but it was gone. I was crushed," Schuh said. "I knew...
  • Mastodon Mystery in Santa Cruz County: Ice Age Tooth Vanishes From Beach

    05/30/2023 10:49:07 AM PDT · by nickcarraway · 18 replies
    KRON4 ^ | May 29, 2023 | Amy Larson
    Paleontologists are busy this Memorial Day weekend trying to find a tooth in Santa Cruz County that dates back to the Ice Ages. An unknown beach-goer picked up a giant mastodon tooth that first surfaced on an Aptos beach Friday. Now scientists are hoping that the scientifically significant tooth will be returned to the Santa Cruz Museum of Natural History where it can be studied and displayed for the public as a piece of ancient history. US Census breakdown: The largest racial group in each Bay Area county The 1-foot-long tooth was originally spotted by a beach-goer strolling through the...
  • Aarhus University [Denmark] Researchers Find Arctic Warmer, Ice-Free in Summertime 10,000 Years Ago!

    05/30/2023 10:48:42 AM PDT · by zeestephen · 21 replies
    Watts Up With That ^ | 27 May 2023 | Aarhus University
    Researchers from Aarhus University, in collaboration with Stockholm University and the United States Geological Survey, analyzed samples from the previously inaccessible region north of Greenland...They showed that the sea ice in this region melted away during summer months around 10,000 years ago...During this time period, summer temperatures in the Arctic were higher than today...This was caused by natural climate variability [not] human-induced warming...
  • Something Big Happened to the Planet a Million Years Ago

    11/09/2021 12:13:25 PM PST · by Red Badger · 42 replies
    https://scitechdaily.com ^ | NOVEMBER 9, 2021 | By EARTH INSTITUTE AT COLUMBIA UNIVERSITY
    A new study suggests that a million years ago, glaciers began sticking more persistently to their beds, triggering cycles of longer ice ages. Here, ice discharged from Iceland’s Breiðamerkurjökull glacier on its way to the Atlantic ocean. Credit: Kevin Krajick/Earth Institute Why did glacial cycles intensify a million years ago? Researchers find clues on the bed of the Atlantic Ocean. Something big happened to the planet about a million years ago. There was a major shift in the response of Earth’s climate system to variations in our orbit around the Sun. The shift is called the Mid-Pleistocene Transition. Before the...
  • Earth’s Orbital Shifts May Have Triggered Ancient Global Warming

    12/06/2020 9:15:29 PM PST · by rktman · 38 replies
    getpocket.com ^ | 9/8/2019 | jim daily
    Earth’s orbit is eccentric, meaning it has changed repeatedly over time. Nudged by the gravitation of Jupiter, Mars, Venus and other planets, our world’s axial tilt and precession are always slowly shifting. And its orbit slips between circular and elliptical paths in complex cycles across millennia. One cycle in particular, with a duration of 405,000 years, helps geologists calibrate planetary dynamics using sediment records: like clockwork, when this cycle brought Earth closer to the sun, the climate warmed, leaving behind evidence laid down in rock.
  • Ancient air challenges prominent explanation for a shift in glacial cycles

    10/30/2019 3:10:35 PM PDT · by BenLurkin · 46 replies
    nature.com ^ | 10/30/2019
    During the past 2.6 million years, Earth’s climate has alternated between warm periods known as interglacials, when conditions were similar to those of today, and cold glacials, when ice sheets spread across North America and northern Europe. Before about 1 million years ago, the warm periods recurred every 40,000 years, but after that, the return period lengthened to an average of about 100,000 years. It has often been suggested that a decline in the atmospheric concentration of carbon dioxide was responsible for this fundamental change. Writing in Nature, Yan et al.1 report the first direct measurements of atmospheric CO2 concentrations...
  • 2002: Ice Ages Look Like Super El Niños

    11/05/2018 3:48:29 PM PST · by Openurmind · 32 replies
    Nature.com ^ | Published online 12 July 2002 | Philip Ball
    Climatologists find familiar fluctuations in Pacific's past - test. “During past ice ages the tropical Pacific Ocean behaved rather as it does today in an El Niño event, bringing downpours to some places and drought to others.” Thus began a 2002 article Nature magazine (12 Jul 2002) For example, it could explain the low atmospheric levels of greenhouse gases, such as carbon dioxide, methane and nitrous oxide, during the last ice age. It is not clear whether this was a cause or a consequence of the difference in global climate, but such decreases would have lowered global temperatures still further,...
  • Mars Used To Look More White Than Red

    05/26/2016 12:49:12 PM PDT · by BenLurkin · 27 replies
    popularmechanics.com ^ | 05/26/2016 | William Herkewitz
    Had you searched the sky with a telescope just a few hundred thousand years ago, you would have struggled to find a red planet. Instead, you would have seen a gleaming-white ice ball where Mars should be. A team of astronomers led by Isaac Smith, an astrophysicist at the Southwest Research Institute in Boulder, Colorado, has collected the first concrete evidence that Mars has just exited an extreme ice age, one so intense it would have put Earth's recent frosty foray to shame. Using cameras and a radar-pinging device on board NASA's Mars Reconnaissance Orbiter, Smith's team deduced this history...
  • Uh huh – New studies say global warming could trigger an ice age

    09/11/2015 12:55:29 PM PDT · by Jack Hydrazine · 117 replies
    IceAgeNow.info ^ | 11SEP2015 | Robert Felix
    “Scientists fear ‘Day After Tomorrow’ climate change,” shouts the headline on MSNBC. According to two new studies, global warming could (supposedly) shut down ocean circulation. This could drop vast stretches of Asia into drought and expose the entire Northern Hemisphere to severe ice and snow. “This change would be sudden and sharp enough to roil civilization—happening in as little as three years and resulting in as much as an 18-degree Fahrenheit drop in average temperatures,” says this article by Tony Dokoupil. Dokoupil tells the story of Jud Partin, a geophysicist at the University of Texas, who gathered new geological data...
  • NASA Admits That Winters are Going to Get Colder…Much Colder

    03/03/2015 9:48:29 AM PST · by Perseverando · 67 replies
    D.C. Clothesline ^ | November 18, 2014 | Chris Carrington
    The Maunder Minimum (also known as the prolonged sunspot minimum) is the name used for the period roughly spanning 1645 to 1715 when sunspots became exceedingly rare, as noted by solar observers of the time. Like the Dalton Minimum and Spörer Minimum, the Maunder Minimum coincided with a period of lower-than-average global temperatures. During one 30-year period within the Maunder Minimum, astronomers observed only about 50 sunspots, as opposed to a more typical 40,000-50,000 spots. (Source) Climatologist John Casey, a former space shuttle engineer and NASA consultant, thinks that last year’s winter, described by USA Today as “one of...
  • Global Warming: A Chilling Perspective

    03/02/2015 6:34:18 AM PST · by rickmichaels · 15 replies
    For more than 2 million years our earth has cycled in and out of Ice Ages, accompanied by massive ice sheets accumulating over polar landmasses and a cold, desert-like global climate. Although the tropics during the Ice Age were still tropical, the temperate regions and sub-tropical regions were markedly different than they are today. There is a strong correlation between temperature and CO2 concentrations during this time. Historically, glacial cycles of about 100,000 years are interupted by brief warm interglacial periods-- like the one we enjoy today. Changes in both temperatures and CO2 are considerable and generally synchronized, according to...
  • Last Ice Age happened in less than year say scientists

    08/02/2008 2:28:28 PM PDT · by Renfield · 78 replies · 261+ views
    The Scotsman ^ | 8-02-08 | angus howarth
    THE last ice age 13,000 years ago took hold in just one year, more than ten times quicker than previously believed, scientists have warned. Rather than a gradual cooling over a decade, the ice age plunged Europe into the deep freeze, German Research Centre for Geosciences at Potsdam said. Cold, stormy conditions caused by an abrupt shift in atmospheric circulation froze the continent almost instantly during the Younger Dryas less than 13,000 years ago – a very recent period on a geological scale. The new findings will add to fears of a serious risk of this happening again in the...
  • Earth could plunge into sudden ice age

    12/03/2009 1:49:11 AM PST · by CSA Rebel · 33 replies · 1,361+ views
    In the film, "The Day After Tomorrow," the world gets gripped in ice within the span of just a few weeks. Now research now suggests an eerily similar event might indeed have occurred in the past. Looking ahead to the future, there is no reason why such a freeze shouldn't happen again — and in ironic fashion it could be precipitated if ongoing changes in climate force the Greenland ice sheet to suddenly melt, scientists say. Starting roughly 12,800 years ago, the Northern Hemisphere was gripped by a chill that lasted some 1,300 years. Known by scientists as the Younger...
  • Appalachians Triggered Ancient Ice Age (Smoky Mountains)

    10/28/2006 11:42:19 PM PDT · by Dallas59 · 31 replies · 2,918+ views
    Scientific American ^ | 10/25/2006 | JR Minkel
    The rise of the Appalachian Mountains seems to have triggered an ice age 450 million years ago by sucking CO2 from the atmosphere. Researchers report evidence that minerals from the mountain range washed into the oceans just before the cold snap, carrying atmospheric carbon dioxide with them. The result clarifies a long standing paradox in the historical relationship between CO2 and climate, experts say. At the start of the so-called Ordovician ice age, about 450 million years ago, the planet went from a state of greenhouse warmth to one of glacial cold, culminating in mass extinctions of ocean life. This...
  • Geochemical 'Fingerprints' Leave Evidence That Megafloods Eroded Steep Gorge

    07/28/2013 3:01:55 AM PDT · by SunkenCiv · 15 replies
    Science Daily ^ | July 22, 2013 | University of Washington
    The Yarlung-Tsangpo River in southern Asia drops rapidly through the Himalaya Mountains on its way to the Bay of Bengal, losing about 7,000 feet of elevation through the precipitously steep Tsangpo Gorge. For the first time, scientists have direct geochemical evidence that the 150-mile long gorge, possibly the world's deepest, was the conduit by which megafloods from glacial lakes, perhaps half the volume of Lake Erie, drained suddenly and catastrophically through the Himalayas when their ice dams failed at times during the last 2 million years... In this case, the water moved rapidly through bedrock gorge, carving away the base...
  • Massive Eltanin Meteor 2.5 million years ago set off mass tsunami, changed the climate?

    09/28/2012 11:55:36 AM PDT · by Ernest_at_the_Beach · 14 replies
    JoNova ^ | September 21st, 2012 | Joanne
    From the file of “Things that would really be catastrophic”. Did a meteor have a role in a major shift in Earth’s Climate?The start of the Quaternary period (2.588 million years ago, where the Pliocene became Pleistocene) coincides with evidence of a mega tsunami in the South Pacific.The Eltanin Meteor fell into the South Pacific 2.5 million years ago setting off a (likely) tsunami that was hundreds of meters high and theoretically pushed mass material into the atmosphere which may have contributed to the cooling the globe had already started on. This meteor was hard to detect because it hit...
  • Did a Pacific Ocean meteor trigger the Ice Age?

    09/20/2012 5:02:02 AM PDT · by Renfield · 38 replies
    PhysOrg ^ | 9-19-2012
    (Phys.org)—When a huge meteor collided with Earth about 2.5 million years ago in the southern Pacific Ocean it not only likely generated a massive tsunami but also may have plunged the world into the Ice Ages, a new study suggests. A team of Australian researchers says that because the Eltanin meteor – which was up to two kilometres across - crashed into deep water, most scientists have not adequately considered either its potential for immediate catastrophic impacts on coastlines around the Pacific rim or its capacity to destabilise the entire planet's climate system. "This is the only known deep-ocean impact...
  • The Eltanin Impact Crater

    10/17/2004 9:46:13 PM PDT · by SunkenCiv · 29 replies · 1,736+ views
    Geological Society of America ^ | October 27-30, 2002 | Christy A. Glatz, Dallas H. Abbott, and Alice A. Nunes
    An impact event occurred at 2.15±0.5 Ma in the Bellingshausen Sea. It littered the oceanic floor with asteroidal debris. This debris is found within the Eltanin Impact Layer. Although the impact layer was known, the crater had yet to be discovered. We have found a possible source crater at 53.7S,90.1W under 5000 meters of water. The crater is 132±5km in diameter, much larger than the previously proposed size of 24 to 80 km.
  • Do Cosmic Ray Changes Regulate Ice Ages? Global Warming Puzzler

    02/07/2010 10:11:07 AM PST · by neverdem · 30 replies · 985+ views
    NCTimes.com ^ | February 6th, 2010 | Bradley Fikes
    According to a new paper by Gerald E. Marsh (PDF), they do. If true, this has great implications for the debate over whether humans are causing global warming, or whether it is a natural phenomenon. More about Marsh here.Marsh says that changes in carbon dioxide levels simply can’t account for the differences in temperatures between interglacials, while changes in cloud cover caused by a change in galactic cosmic ray flux can.Changes in cosmic rays The conventional global warming explanation for the Ice Ages and interglacial periods (we are in one right now), is that a change in the Earth’s orbit...
  • Carbon dioxide not to blame in ice age mystery

    06/20/2009 9:22:50 PM PDT · by neverdem · 30 replies · 1,709+ views
    Science News ^ | June 18th, 2009 | Sid Perkins
    The reason why those cold spells now come less frequently is still unknown Scientists have peered back in time with a new analytical technique to see atmospheric concentrations of carbon dioxide more than 2 million years into the past. The findings indicate that a long-term decline in the levels of that greenhouse gas isn’t to blame for a geologically recent shift in the frequency of ice ages, scientists say. The record of ice ages in North America stretches back 2.4 million years (SN: 2/5/05, p. 94). Until about 1.2 million years ago, ice ages in the Northern Hemisphere occurred about...