So far we’ve been seeing lots of signs of a cold coming winter: birds migrating from Siberia to Britain weeks early, unusual early-autumn snowfalls across Europe, various reports warning of the worst winter in decades etc. In August, weather analyst Gavin Partridge put up one of his weather videos here. In it he looks at past solar activity, the current Solar Cycle no. 24, and its strong similarity to Solar Cycle no. 12.
Articles Tagged: climate cycles
The Ordovician geologic period included a climate characterized by high atmospheric carbon dioxide (CO2) levels, warm average temperatures and flourishing life. Near the end of the period, CO2 levels dropped significantly but precisely when and how fast is poorly known.
El Nino is a natural, tropical, ocean temperature phenomenon, in which warm water near the equator in the Pacific moves towards South America’s northern coast and then turns northward, as far as Haida Gwaii and Alaska, said Walker. “As warm things expand, we see a higher water level, on the order of tens of centimetres, depending on where you are,” said Walker. “So that’s super imposed on the tides and storms are then superimposed on top of that.”
Researchers at The University of Texas at Austin have found that a well-known period of abrupt climate change 12,000 years ago occurred rapidly in northern latitudes but much more gradually in equatorial regions, a discovery that could prove important for understanding and responding to future climate change.
German scientists Horst-Joachim Lüdecke, Alexander Hempelmann and Carl Otto Weiss have published two influential studies in the European Geophysical Union journal. The first, published in 2013, examined the past 250 years of climate history. The second, published earlier this year, extended the research through the past 2,500 years. Their findings are consistent with the main currents of modern climate science (as opposed to climate politics): The analysis of the past 2500 years involved data from tree rings, sediment cores, stalagmites, etc. A plot of the data yields a climate operating with cyclic behavior.
The second ice age during the Cryogenian period was not followed by the sudden and chaotic melting-back of the ice as previously thought, but ended with regular advances and retreats of the ice, according to research published by scientists from the University of Birmingham in the journal Nature Geoscience. The researchers also found that the constant advance and retreat of ice during this period was caused by the Earth wobbling on its axis
Multiscale monsoon variability during the last two climatic cycles revealed by spectral signals in Chinese loess and speleothem records
The East Asian Monsoon (EAM) exhibits a significant variability on timescales ranging from tectonic to centennial as inferred from loess, speleothem and marine records. However, the relative contributions and plausible driving forces of the monsoon variability at different timescales remain controversial. […] Spectral results of these two proxies display clear glacial and orbital periodicities corresponding to ice volume and solar cycles, and evident millennial signals which are in pace with Heinrich rhythm and Dansgaard–Oeschger (DO) cycles.