Category Archives: Paleoclimatology

Study: Sharks can handle climate change in the Arctic

From the University of Chicago and the “I didn’t know Jaws lived near the North Pole ” department: Shark teeth analysis provides detailed new look at Arctic climate change A new study shows that some shark species may be able … Continue reading

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Posted in Paleoclimatology | 78 Comments

That ocean currents switch flipping thing again

From the National Science Foundation: Press Release 14-081 Ancient ocean currents may have changed pace and intensity of ice ages Climate scientists have long tried to explain why ice-age cycles became longer and more intense some 900,000 years ago, switching … Continue reading

Posted in Oceans, Paleoclimatology | 53 Comments

Research provides new theory on cause of ice age 2.6 million years ago

From Royal Holloway, University of London New research published today (Friday 27th June 2014) in the journal Nature Scientific Reports has provided a major new theory on the cause of the ice age that covered large parts of the Northern … Continue reading

Posted in Paleoclimatology, Salinity | 68 Comments

Study: the Greenland ice sheet collapsed 400,000 years ago

From Oregon State University Study links Greenland ice sheet collapse, sea level rise 400,000 years ago CORVALLIS, Ore. – A new study suggests that a warming period more than 400,000 years ago pushed the Greenland ice sheet past its stability … Continue reading

Posted in Greenland ice sheet, Paleoclimatology | 69 Comments

Study finds climate of the past behaved as hemispherical opposites

This is from a press release from the Korean Institute of Geoscience and Mineral resources (KIGAM) The English in the PR is not the best, but is does have an interesting finding. Identifying opposite patterns of climate change between the … Continue reading

Posted in Paleoclimatology | 30 Comments

‘Climate Disruption’ of the past seen in mummy DNA

One of the favorite boogeyman arguments used in climate alarmism is that climate has been stable for thousands of years, and that our recent industrialized era emissions will result in climate tipping point. However, this study in the Proceeding of … Continue reading

Posted in Carbon dioxide, Climate News, Paleoclimatology | 32 Comments

Another example of ‘team science’ suppression

Over the past decade, we have seen many examples of what would be categorized as” team science” when it comes to suppressing ideas that are considered inconvenient or contrary to belief systems in climate science. Over at the blog Bishop … Continue reading

Posted in censorship, Climate ugliness, Paleoclimatology | 109 Comments

Mining proxies for the Southern Annular Mode

Steve McIntyre writes about what he considers another “completely worthless” exercise in statistical data mining, writing: =============================================================== In today’s post, I will look at a new Naturemag climate reconstruction claiming unprecedentedness (h/t Bishop Hill): “Evolution of the Southern Annular Mode … Continue reading

Posted in Paleoclimatology, Proxies | 29 Comments

Claim: Modern Ocean Acidification Is Outpacing Ancient Upheaval, Study Suggests

Rate May Be Ten Times Faster, According to New Data From Lamont-Doherty Earth Observatory: Some 56 million years ago, a massive pulse of carbon dioxide into the atmosphere sent global temperatures soaring. In the oceans, carbonate sediments dissolved, some organisms … Continue reading

Posted in Ocean acidification, Paleoclimatology | 223 Comments

Glacial Inception: the climatic ‘madhouse’

Guest essay by William McClenney Abstract: I used to think there was only one known substitute for intelligence – stupidity. I have since realized that I left out evil (see Hitler et al). I have also come to the conclusion … Continue reading

Posted in Glaciers, Global cooling, Paleoclimatology | 100 Comments

What caused a 1300 year deep freeze 12,800 years ago? New PNAS paper says it wasn’t an impact

About 12,800 years ago, the last Ice Age was coming to an end, the planet was warming up. Then, inexplicably, the planet plunged into a deep freeze, returning to near-glacial temperatures for more than a millennium before getting warm again. … Continue reading

Posted in Paleoclimatology | 135 Comments

Today’s Antarctic region once as hot as California, Florida

From Yale University, where that means that even though Earth 40-50 million years ago had a completely different arrangement of continents and climate, it still somehow will “underscore the potential for increased warmth at Earth’s poles and the associated risk … Continue reading

Posted in Antarctic, Paleoclimatology | 57 Comments

Ice dating from Krypton

Here’s something useful that works like radiocarbon dating, but on ice. Since it is cosmic ray based, it makes me wonder if it could be used to reconstruct the cosmic ray record to test Svensmark’s theory of cosmic ray modulation … Continue reading

Posted in Antarctic, Paleoclimatology, Science | 42 Comments

When Greenland was green in warmer times

From the University of Vermont Science: There’s something ancient in the icebox Researchers find 3-million-year-old landscape beneath Greenland Ice Sheet Glaciers are commonly thought to work like a belt sander. As they move over the land they scrape off everything—vegetation, … Continue reading

Posted in Paleoclimatology | 85 Comments

Duke Neukom’s Secret Sauce

Guest Post by Willis Eschenbach In my last post, I talked about the “secret sauce”, as I described it, in the Neukom et al. study “Inter-hemispheric temperature variability over the past millennium”. By the “secret sauce” I mean the method … Continue reading

Posted in Paleoclimatology, Proxies | Tagged , , , | 115 Comments

New study shows Arctic sea ice extent ~6000 years ago was much less than today

This is interesting, somehow the Earth managed to reduce a good portion of the Arctic Ice Cap during the Holocene Climate Optimum from approximately 10,000-6,000 years ago without the help of the industrial revolution, fossil fuels, or automobile emissions. This … Continue reading

Posted in Arctic, Paleoclimatology, Sea ice | 87 Comments

The Goldilocks principle: New hypothesis explains earth’s continued habitability

From the University of Southern California Geologic cycles act as a climate control, releasing and absorbing atmospheric carbon dioxide in a balance that helps keep the planet not too hot and not too cold Researchers from USC and Nanjing University … Continue reading

Posted in Paleoclimatology | 83 Comments

Claim: UCLA study yields more accurate data on thousands of years of climate change

From the University of California – Los Angeles Research also helps unravel the mystery of retreating glaciers in the Pacific Ocean’s western tropics Using a cutting-edge research technique, UCLA researchers have reconstructed the temperature history of a region that plays … Continue reading

Posted in Glaciers, Paleoclimatology | 86 Comments

Claim: Ghenghis Khan rode climate change to power

From the National Science Foundation Press Release 14-032 Climate of Genghis Khan’s ancient time extends long shadow over Asia of today Current drought in Mongolia could have serious consequences View of the modern-day Orkhon Valley near Karakorum, the ancient Mongol … Continue reading

Posted in Climate News, Paleoclimatology | 83 Comments

Sun’s energy output may have led to marked natural climate change in Europe over the last 1000 years

From Cardiff University Sun’s energy influences 1,000 years of natural climate variability in North Atlantic Changes in the sun’s energy output may have led to marked natural climate change in Europe over the last 1000 years, according to researchers at … Continue reading

Posted in Paleoclimatology, Solar | 213 Comments

Climate change before our current CO2 worries wrecked Indian mega-cities

From the University of Cambridge, it makes you wonder how climate could just go and change abruptly on its own back then, with CO2 levels being in the “safe zone” and all that: =========================================================== Decline of Bronze Age ‘megacities’ linked … Continue reading

Posted in Paleoclimatology | 72 Comments

New hockey team paper: models tuned to tree rings and other palaeo-climate reconstructions

A new paper is out in a special issue of Climate of the Past called Progress in paleoclimate modelling It is from the ‘hockey team’ and titled “Using palaeo-climate comparisons to constrain future projections in CMIP5″.  I loved this tweet … Continue reading

Posted in Gavin Schmidt, Paleoclimatology | 44 Comments

Giant mass extinction may have been quicker than previously thought – carbon dioxide blamed

From the Massachusetts Institute of Technology , another “carbon as planet killer” scenario. MIT researchers find that the end-Permian extinction happened in 60,000 years — much faster than earlier estimates The largest mass extinction in the history of animal life … Continue reading

Posted in Paleoclimatology | 165 Comments

New high-resolution record of middle to late Miocene climate evolution

From AGU weekly highlights: After the fairly warm Miocene climate optimum about 17-15 million years ago, Earth’s climate began to cool. Holbourn et al. present a new high-resolution record of climate evolution over the middle to late Miocene from 12.9 … Continue reading

Posted in Paleoclimatology | 20 Comments

Inconvenient study: Arctic was warmer than the present during the Medieval Warm Period

New paper finds temperatures were as much as 0.5c warmer in the Arctic during the MWP than today. The Hockeyschtick reports: A paper published yesterday in Global and Planetary Change reconstructs temperatures in Northern Fennoscandia [within the Arctic circle] over the … Continue reading

Posted in Climate News, Paleoclimatology | 85 Comments

Claim: Arctic warmth unprecedented in 44,000 years

Using radiocarbon dating, new research in Geophysical Research Letters has calculated the age of relic moss samples that have been exposed by modern Arctic warming. Results claim that temperatures in the Arctic are warmer than during any sustained period since … Continue reading

Posted in Arctic, Climate News, Paleoclimatology | 69 Comments

Who knew? Plants are ‘heavy water’ rain gauges

From the GFZ GeoForschungsZentrum Potsdam, Helmholtz Centre  and the Varved D2O department: The water cycle amplifies abrupt climate change The role of the hydrological cycle during abrupt temperature changes is of prime importance for the actual impact of climate change … Continue reading

Posted in Curious things, Paleoclimatology, Rainfall | Tagged , , , | 32 Comments

Bad news for Michael Mann’s ‘treemometers’ ?

From the “trees aren’t linear instruments and the Liebigs Law department” and the Smithsonian Tropical Research Institute, comes this story that suggests the older trees are, the less linear their tree ring growth might be, which has implications for “paleoclimatology” … Continue reading

Posted in Climate News, Michael E. Mann, Paleoclimatology | 95 Comments

Do super-tides kick start interglacials ?

Guest essay by Clive Best It is proposed that for the last 800,000 years  super-tides caused by maxima in orbital eccentricity have been the key factor needed to break up large northern ice sheets to enable the 41,000 year insolation … Continue reading

Posted in Climate News, Paleoclimatology | 134 Comments

Many Climate Reconstructions Incorrectly Attributed to Temperature Change.

Guest essay by Dr. Tim Ball The Intergovernmental Panel on Climate Change (IPCC) set climate research back thirty years, mostly by focusing world attention on CO2 and higher temperature. It was a classic misdirection that required planning. The IPCC was … Continue reading

Posted in IPCC, Paleoclimatology | Tagged , , , , , , , | 151 Comments

Oh say can you see modern sea level rise from a geological perspective?

Guest post by David Middleton Experts say the IPCC underestimated future sea level rise A new study surveys 90 sea level rise experts, who say sea level rise this century will exceed IPCC projections Wednesday 4 December 2013 John Abraham … Continue reading

Posted in Adjustments/Corrections, Al Gore, Alarmism, Antarctic, Arctic, Gravity, Greenland ice sheet, Hiatus in Global Warming, IPCC, IPCC AR5 Report, Paleoclimatology, Sea level | Tagged , , , , | 101 Comments

Defusing the Arctic Methane Time Bomb

Guest Post by David Middleton The Arctic methane time bomb keeps ticking… From Scientific American… Climatewire More Arctic Methane Bubbles into Atmosphere A new study suggests more than twice as much of the potent greenhouse gas is bubbling out of … Continue reading

Posted in Alarmism, Arctic, Methane, Paleoclimatology, Sea ice, Sea level | 80 Comments

New ice core record shows climate variability in West Antarctica

Similar warming and cooling trends occurred in the mid-nineteenth and eighteenth centuries From AGU highlights: A 308-year ice core record provides new data on climate variability in coastal West Antarctica and shows that a clear warming trend has occurred in … Continue reading

Posted in Antarctic, Paleoclimatology | Tagged , , , , , , , | 31 Comments

Rapid climate changes in the younger Dryas, but with a 120 year time lag

From GFZ GeoForschungsZentrum Potsdam, Helmholtz Centre Regional climate changes can be very rapid. A German-British team of geoscientists now reports that such a rapid climate change occurred in different regions with a time difference of 120 years. Investigation in the … Continue reading

Posted in Paleoclimatology | Tagged , , , , , , , | 44 Comments

Study: Greenland Ice Sheet was smaller 3000-5000 years ago than today

From the University of Buffalo Clues in the Arctic fossil record suggest that 3-5,000 years ago, the ice sheet was the smallest it has been in the past 10,000 years Summary: Ice sheets are like bulldozers. As they grow, they … Continue reading

Posted in Greenland ice sheet, Paleoclimatology | Tagged , , , , , , , | 83 Comments