All Articles Tagged As: ice age
The first comprehensive study of changes in the oxygenation of oceans at the end of the last Ice Age has implications for the future of our oceans under global warming.
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 | After the last ice age peaked about 18,000 years ago, levels of atmospheric carbon dioxide rose about 30 percent. Scientists believe that the additional carbon dioxide -- a heat-trapping greenhouse gas -- played a key role in warming the planet and melting the continental ice sheets. They have long hypothesized that the source of the gas was the deep ocean. ...> Full Article |
The ebb and flow of the ocean tides, generally thought to be one of the most predictable forces on Earth, are actually quite variable over long time periods, in ways that have not been adequately accounted for in most evaluations of prehistoric sea level changes.
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Climate researchers at the Alfred Wegener Institute for Polar and Marine Research in the Helmholtz Association expand a prevalent theory regarding the development of ice ages. In the current issue of the journal Nature, three physicists from AWI's working group "Dynamics of the Palaeoclimate" present new calculations on the connection between natural insulation and long-term changes in global climate activity.
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 | A set of maps created by the University of Sheffield have illustrated, for the first time, how our last British ice sheet shrunk during the Ice Age. Led by Professor Chris Clark from the University's Department of Geography, a team of experts developed the maps to understand what effect the current shrinking of ice sheets in parts of the Antarctic and Greenland will have on the speed of sea level rise. ...> Full Article |
Southampton researchers have estimated that sea-level rose by an average of about 1 meter per century at the end of the last Ice Age, interrupted by rapid "jumps" during which it rose by up to 2.5 meters per century. The findings, published in Global and Planetary Change, will help unravel the responses of ocean circulation and climate to large inputs of ice-sheet meltwater to the world ocean.
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 | A new study in Nature finds that in addition to Antarctica, New Zealand was warming at the end of the last ice age, indicating that the deep freeze up north, called the Younger Dryas for the white flower that grows near glaciers, bypassed much of the southern hemisphere. ...> Full Article |
Scientists have found the possible source of a huge carbon dioxide "burp" that happened some 18,000 years ago and which helped to end the last ice age.
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 | At the end of the last interglacial epoch, around 115,000 years ago, there were significant climate fluctuations. In Central and Eastern Europe, the slow transition from the Eemian Interglacial to the Weichselian Glacial was marked by a growing instability in vegetation trends with possibly at least two warming events. This is the finding of German and Russian climate researchers who have evaluated geochemical and pollen analyses of lake sediments in Saxony-Anhalt, Brandenburg and Russia. ...> Full Article |
 | Ice Age climate records from an Arizona stalagmite link the Southwest's winter precipitation to temperatures in the North Atlantic, according to new research. The stalagmite yielded an almost continuous, century-by-century climate record spanning 55,000 to 11,000 years ago, a time the Southwest flip-flopped between wet and dry periods. The finding is the first to document that the abrupt changes in Ice Age climate known from Greenland also occurred in the southwestern US. ...> Full Article |
 | In a vivid example of how a small geographic feature can have far-reaching impacts on climate, new research shows that water levels in the Bering Strait helped drive global climate patterns during ice age episodes dating back more than 100,000 years. ...> Full Article |
 | A new study that reports precise ages for glacial moraines in southern Peru links climate swings in the tropics to those of Europe and North America during the Little Ice Age approximately 150 to 350 years ago. The study, published this week in Science, "brings us one step closer to understanding global-scale patterns of glacier activity and climate during the Little Ice Age," says lead author Joe Licciardi of the University of New Hampshire. ...> Full Article |
Researchers have largely put to rest a long debate on the underlying mechanism that has caused periodic ice ages on Earth for the past 2.5 million years -- they are ultimately linked to slight shifts in solar radiation caused by predictable changes in Earth's rotation and axis.
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Team investigates the climate of planet Earth 440 million years ago
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Earth's earliest ice ages may have been due to the rise of oxygen in Earth's atmosphere, which consumed atmospheric greenhouse gases and chilled the earth. Alan J. Kaufman, professor of geology at the University of Maryland, Maryland colleague James Farquhar, and a team of scientists from Germany, South Africa, Canada, and the US, uncovered evidence that the oxygenation of Earth's atmosphere coincided with the first widespread ice age on the planet.
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Very large and abrupt changes in temperature recorded over Greenland and across the North Atlantic during the last Ice Age were actually global in extent, according to an international team of researchers led by Cardiff University.
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Team reports that sea level rise from greenhouse-induced warming of the Greenland ice sheet could be double or triple current estimates over the next century.
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New study reveals the circulation of the atmosphere over the Mediterranean during the last ice age, 23,000 to 19,000 years ago, and how this affected the local climate.
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 | Research team says methane-triggered global warming ended last 'snowball' ice age; dramatically reorganized Earth system ...> Full Article |
Natural gas reservoirs in Michigan's Antrim Shale are providing new information about global warming and the Earth's climate history, according to a recent study by Steven Petsch, a geoscientist at the University of Massachusetts Amherst. The study is also good news for energy companies hoping to make natural gas a renewable resource.
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 | Researchers have taken cores from the sediments of a Canadian Arctic lake and found an interglacial record indicating two ice-free periods that could pre-date the Holocene Epoch. ...> Full Article |
The flood believed to be behind the Noah's Ark myth kick-started European agriculture, according to new research by the Universities of Exeter and Wollongong, Australia. Published in the journal Quaternary Science Reviews, the research paper assesses the impact of the collapse of the North American (Laurentide) Ice Sheet, 8000 years ago. The results indicate a catastrophic rise in global sea level led to the flooding of the Black Sea and drove dramatic social change across Europe. The research team argues that, in the face of rising sea levels driven by contemporary climate change, we can learn important lessons from the past.
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 | A team of scientists have identified a new likely source of a spike in atmospheric methane coming out of the North during the end of the last ice age. ...> Full Article |
New research has shed light on an important, but previously little-understood period in Africa's climate history that has implications for understanding human evolution and the expansion of Homo sapiens out of tropical Africa.
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 | Carbon dioxide did not cause the end of the last ice age, a new study in Science suggests, contrary to past inferences from ice core records. ...> Full Article |
Researcher shows that deep-sea temperatures rose 1,300 years before the buildup of atmospheric carbon dioxide, ruling out CO2 as driver of the last ice age's meltdown.
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Future ice ages may be delayed by up to half a million years by our burning of fossil fuels. That is the implication of recent work by Dr Toby Tyrrell of the University of Southampton's School of Ocean and Earth Science at the National Oceanography Centre, Southampton.
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 | A question unresolved for more than a century may have an answer ...> Full Article |
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