Category Archives: Paleoclimatology

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

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Posted in Paleoclimatology | 78 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