Tag Archives: Younger Dryas

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

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

Multiple, Intense, Abrupt Late Pleistocene Warming And Cooling: Implications For Understanding The Cause Of Global Climate Change

Guest essay by Dr. Don J. Easterbrook Dept. of Geology, Western Washington University, Bellingham, WA The results of oxygen isotope measurements from ice cores in the Greenland and Antarctic ice sheets several decades ago stunned the scientific world. Among the … Continue reading

Posted in Paleoclimatology | Tagged , , , , , , , | 89 Comments

Where Lies the Younger Dryas Smoking Gun?

Guest Post by Dan Johnston I have been following the proposed collision theory for the onset of the Younger Dryas for a number of years with considerable interest as it explains so much in a relatively straightforward fashion, if true. … Continue reading

Posted in Paleoclimatology | Tagged , | 86 Comments

Widespread evidence of cosmic impact documented – likely cause of the Younger Dryas cool climate episode

From the University of California – Santa Barbara some paleoclimatology without the need to see hockey sticks. Comprehensive analysis of impact spherules supports theory of cosmic impact 12,800 years ago (Santa Barbara, California) –– About 12,800 years ago when the … Continue reading

Posted in Paleoclimatology | Tagged , , | 73 Comments

Claim: Trigger for Earth’s last big freeze identified

From the University of Massachusetts at Amherst AMHERST, Mass. – For more than 30 years, climate scientists have debated whether flood waters from melting of the enormous Laurentide Ice Sheet, which ushered in the last major cold episode on Earth … Continue reading

Posted in Modeling, Paleoclimatology | Tagged , , , , , | 90 Comments

‘Counterintuitive finding suggests that unexpected factors may govern a glacier’s response to climate change’

From the University at Buffalo, new evidence that large ice sheets can grow/disappear quickly on decadal scales in response to regional temperature changes. A descriptive video follows. How fast can ice sheets respond to climate change? Scientists report that prehistoric … Continue reading

Posted in Glaciers, Paleoclimatology | Tagged , , , , , | 35 Comments

‘We don’t believe the ice cores can be interpreted purely as a signal of temperature’

From the University of Wisconsin: Greenland ice may exaggerate magnitude of 13,000-year-old deep freeze by Chris Barncard Ice samples pulled from nearly a mile below the surface of Greenland glaciers have long served as a historical thermometer, adding temperature data … Continue reading

Posted in Greenland ice sheet, Paleoclimatology | Tagged , , , , , , , | 43 Comments

The Intriguing Problem Of The Younger Dryas—What Does It Mean And What Caused It?

This is a follow up posting to Younger Dryas -The Rest of the Story! Guest post by Don J. Easterbrook Dept. of Geology, Western Washington University. The Younger Dryas was a period of rapid cooling in the late Pleistocene 12,800 … Continue reading

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Younger Dryas -The Rest of the Story!

WUWT readers may recall this recent story: New evidence of Younger Dryas extraterrestrial impact The story below provides much more detail about the Younger Dryas event and the split that has developed in the scientific community over the cause. I’ve added … Continue reading

Posted in Paleoclimatology | Tagged , , , , , , , | 156 Comments

New evidence of Younger Dryas extraterrestrial impact

From the University of California – Santa Barbara Study finds new evidence supporting theory of extraterrestrial impact (Santa Barbara, Calif.) –– An 18-member international team of researchers that includes James Kennett, professor of earth science at UC Santa Barbara, has … Continue reading

Posted in Paleoclimatology | Tagged , , , , , , , | 117 Comments

New evidence supporting extraterrestrial impact at the start of the Younger Dryas

There’s a new paper in PNAS worth having a look at. It seems the authors found some very strong evidence for a comet or asteroid impact during the period known as the Younger Dryas. According to Wikipedia: The Younger Dryas … Continue reading

Posted in Paleoclimatology | Tagged , , , , , , , | 254 Comments

Evaporation, not outflow, drained ancient Lake Agassiz during the Younger Dryas

From the University of Cincinnati: Long-Lost Lake Offers Clues to Climate Change What caused water levels to drop in an immense yet long-vanished lake? Research by a University of Cincinnati geologist suggests that conditions 12,000 years ago encouraged evaporation. Not long … Continue reading

Posted in Paleoclimatology | Tagged , , , | 64 Comments

Easterbrook on the magnitude of Greenland GISP2 ice core data

MAGNITUDE AND RATE OF CLIMATE CHANGES Guest post by Dr. Don J. Easterbrook, Dept. of Geology, Western Washington University The GISP2 Greenland ice core has proven to be a great source of climatic data from the geologic past. Ancient temperatures … Continue reading

Posted in Paleoclimatology | Tagged , , , , , | 132 Comments

On “Trap-Speed”, ACC and the SNR

Guest post by William McClenney “Trap-Speed”: We will initiate this discussion by looking at some of the early, and then later, recognitions of some of climate change’s “best lap times” in terms of sheer speed. Perhaps one of the more … Continue reading

Posted in Paleoclimatology | Tagged , , | 75 Comments