Paleo-climatology

New Study: East Antarctica Was Up To 6°C Warmer Than Today During The Medieval Warm Period

New Study: East Antarctica Was Up To 6°C Warmer Than Today During The Medieval Warm Period

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Share this…FacebookTwitterAs recently as 2000 to 1000 years ago, spanning the Roman to Medieval Warm Periods, East Antarctica was 5-6°C warmer than it is today. The consequent ice melt resulted in >60 meters higher water levels in East Antarctica’s lakes. East Antarctica has been rapidly cooling in recent decades, with magnitudes reaching -0.7°C to -2.0°C […]

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Unheralded Global Ocean 2000-Year Temperature Reconstruction Reveals Embarrassingly Small Modern Changes

Unheralded Global Ocean 2000-Year Temperature Reconstruction Reveals Embarrassingly Small Modern Changes

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Share this…FacebookTwitterIt didn’t receive much a attention in 2015, but a comprehensive Nature journal study of 0-2000 A.D. global sea surface temperatures shows 1) climate changes occurred more than twice as fast during the Little Ice Age (LIA) than since 1800, 2) the entire first millennium was >1 standard deviation (s.d. unit) warmer than today, […]

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Scientists Assert Relative Sea Levels Were 32 Meters Higher Than Today In South Greenland 13,800 Years Ago

Scientists Assert Relative Sea Levels Were 32 Meters Higher Than Today In South Greenland 13,800 Years Ago

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Share this…FacebookTwitterPrior to the transition from the last ice age to the current interglacial climate, when CO2 levels still lingered below 250 ppm, the relative sea levels in southern Greenland were “at least ∼32 m above present.” Relative sea levels have undergone a series of major changes since the last glacial maximum, when global sea […]

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New Study Finds Robust Statistical Probability Temperature Drives CO2 Changes, Upending 'Scientific Perception'

New Study Finds Robust Statistical Probability Temperature Drives CO2 Changes, Upending ‘Scientific Perception’

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Share this…FacebookTwitterPrompted by the observation that dramatic COVID-related reductions in 2020 human CO2 emissions had zero impact on the Earth’s CO2 concentration, two scientists conduct extensive statistical probability analyses to conclude temperature changes lead CO2 changes, not the other way around. The nearly global acceptance of economically-devastating lockdowns as a mitigating response to the COVID-19 pandemic […]

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Earth's Oceans Used To Be 20-25°C Warmer Than They Are Today

Earth’s Oceans Used To Be 20-25°C Warmer Than They Are Today

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Share this…FacebookTwitterToday’s global ocean temperatures hover around 15°C on average. About 400 to 500 million years ago, Earth’s ocean temperatures averaged 35-40°C and atmospheric CO2 concentrations were “5-10x higher than present day values” (Henke et al., 2018). During this period, the marine biosphere thrived (Voosen et al., 2019). Image Source: Henke et al., 2018 Image […]

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Scientists Find Peak 1940s Warmth, Post-1950s Cooling In The Same Western US Region Where Hockey Sticks Emerged

Scientists Find Peak 1940s Warmth, Post-1950s Cooling In The Same Western US Region Where Hockey Sticks Emerged

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Share this…FacebookTwitterA new 1735-2015 temperature reconstruction (Heeter et al., 2020) using Western US tree ring proxies shows peak 1940s warmth and post-1950s cooling. This is the same region Dr. Michael Mann used tree ring data to construct his famous hockey stick graph. Image Source: Heeter et al., 2020 A new Scandinavian temperature reconstruction (Seftigen et […]

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Determined Scientists Add Phantom 'Unprecedented' Warmth To New Temperature Reconstructions

Determined Scientists Add Phantom ‘Unprecedented’ Warmth To New Temperature Reconstructions

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Share this…FacebookTwitterPaleoclimate reconstructions that find no unusual modern warming are nonetheless characterized as showing sharp temperature increases in recent decades anyway. A new (Li et al., 2020) 1818-2012  temperature reconstruction determined 1955 (6.33 °C) and 2001 (7.17 °C) were the 1st and 5th coldest years in northeastern China in the last 200 years. The two […]

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Scientists: Antarctica Ice Sheet Thinned 400 Meters 5000 Years Ago, And Natural Oceanic Cycles Drive Climate

Scientists: Antarctica Ice Sheet Thinned 400 Meters 5000 Years Ago, And Natural Oceanic Cycles Drive Climate

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Share this…FacebookTwitterToday we present two papers on climate reconstruction using proxy data. One about East Antarctica and the other about belize. Hat-tip reader Mary Brown. AMO behind sea surface temperatures First we look at a paper authored by a team of German scientists: “Great Blue Hole (Lighthouse Reef, Belize): A continuous, annually-resolved record of Common […]

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New Study Finds Weak CO2-Induced Warming An 'Implausible' Explanation For The End-Triassic Mass Extinction

New Study Finds Weak CO2-Induced Warming An ‘Implausible’ Explanation For The End-Triassic Mass Extinction

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Share this…FacebookTwitterEvidence that temperature swings of ±17°C occurred during the end-Triassic mass extinction event imply that CO2 would have needed to increase 8- to 1,024-fold (3 to 10 doublings) to have induced that magnitude of temperature change. It didn’t. Evidence from a new study (Petryshyn et al., 2020) suggests “repeated” temperature swings of 16-17°C occurred […]

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Two New Temperature Records Show No Warming In Central Asia Since 1766 A.D. Or In Spain Since 1350 A.D.

Two New Temperature Records Show No Warming In Central Asia Since 1766 A.D. Or In Spain Since 1350 A.D.

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Share this…FacebookTwitterScientists continue to publish papers revealing no unusual climate trends for the last several centuries in many regions of the world. Despite the 135 ppm increase in CO2 concentration (275 ppm to 410 ppm) since the 1700s, a new 250-year temperature (precipitation) reconstruction (Peng et al., 2020) shows there has been no net warming […]

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Wild Horses And Mammoths Were Still Eating Grass Year-Round In The Arctic Until 2500-4000 Years Ago

Wild Horses And Mammoths Were Still Eating Grass Year-Round In The Arctic Until 2500-4000 Years Ago

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Share this…FacebookTwitterSurface temperatures needed to have been much warmer than today to supply enough grass year-round for horses and mammoths to subsist in the Arctic through the Late Holocene. Wrangel Island is located in the Arctic’s Chukchi Sea, which is covered in sea ice for all but a few weeks of the year today (Porter […]

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Mann, Rahmstorf Struggle To Defend: Flawed Hockey Stick Chart Under Fire (Again) In Germany

Mann, Rahmstorf Struggle To Defend: Flawed Hockey Stick Chart Under Fire (Again) In Germany

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Share this…FacebookTwitter Climate alarmism dissenters getting increasingly vocal. Yesterday I reported on how science editor Axel Bojanowski at German national daily DIE WELT had written a commentary on the deceptive use of a faulty climate hockey stick by ZDF German broadcasting. Naturally whenever anything of the sort happens here in Germany, attack dog Stefan Rahmstorf […]

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