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Inconvenient study: La Niña killed coral reefs 4100 years ago and lasted over two millennia

From Georgia Tech and the “it’s your SUV that’s killing the coral reefs today, why can’t you get that through your head” department comes this inconvenient study. La Nina-like conditions associated with 2,500-year-long shutdown of coral reef growth A new study has found that La Niña-like conditions in the Pacific Ocean off the coast of…

Exposed ice wedges at the coast of the Siberian island Muostakh. With this picture in mind, one can understand, why early researchers thought ice wedges could be nothing else than buried glaciers.
Credit Photo: Thomas Opel, Alfred-Wegener-Institut

Study: Siberian permafrost has been warming for 7000 years

Winters in Siberian permafrost regions have warmed since millenia For the first time, researchers have reconstructed the development of winter temperatures in Russia’s Lena River Delta based on old ground ice data From the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research For the first time, researchers at the Alfred Wegener Institute have…

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An Engineer’s Ice-Core Thought Experiment

Guest essay by Ronald D Voisin (For the Ice-Core “Near-Perfect-Recordation” Enthusiasts) Ice-cores analysis has provided many valuable insights into past climate. We can be more confident for some of these insights than others. One troubling insight surrounds the peaks of historic CO2 atmospheric concentration. In this essay, I would like to describe what I believe…

asteroid-impact

Study casts doubt on mammoth-killing cosmic impact

From UC-Davis: Rock soil droplets formed by heating most likely came from Stone Age house fires and not from a disastrous cosmic impact 12,900 years ago, according to new research from the University of California, Davis. The study, of soil from Syria, is the latest to discredit the controversial theory that a cosmic impact triggered…

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Vostok and the 8000 year time lag

Guest essay by Euan Mearns In their seminal paper on the Vostok Ice Core, Petit et al (1999) [1] note that CO2 lags temperature during the onset of glaciations by several thousand years but offer no explanation. They also observe that CH4 and CO2 are not perfectly aligned with each other but offer no explanation.…

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New Study: Two Thousand Years of Northern European Summer Temperatures Show a Downward Trend

In a paper published in the Journal of Quaternary Science, Esper et al. (2014) write that tree-ring chronologies of maximum latewood density (MXD) “are most suitable to reconstruct annually resolved summer temperature variations of the late Holocene.” And working with what they call “the world’s two longest MXD-based climate reconstructions” – those of Melvin et…