Cyclone Activity Has Been Intensified in the Arctic

Cyclones are key weather elements that make a major contribution to climate trends and variability, and that also bring intense high-frequency changes in wind, temperature and precipitation. Given the recent dramatic change of the Arctic climate, Arctic cyclone activity has attracted an increasing amount of attention. We investigated the Arctic cyclone activity in the context…

Estimating the permafrost-carbon feedback on global warming

A key uncertainty is the fraction of carbon that might be decomposed under anaerobic conditions – resulting potentially in methane emissions to the atmosphere. Given the high warming potential of methane, the overall magnitude of the permafrost-carbon feedback will depend strongly on this fraction. Thawing of permafrost and the associated release of carbon constitutes a…

Soil carbon and climate change: from the Jenkinson effect to the compost-bomb instability

Study: Long-term warming equivalent to 10°C per century could be sufficient to trigger compost-bomb instability in drying organic soils Wiley: First generation climate–carbon cycle models suggest that climate change will suppress carbon accumulation in soils, and could even lead to a net loss of global soil carbon over the next century. These model results are qualitatively…

Last Time Carbon Dioxide Levels Were This High: 15 Million Years Ago

By analyzing the chemistry of bubbles of ancient air trapped in Antarctic ice, scientists have been able to determine the composition of Earth’s atmosphere going back as far as 800,000 years, and they have developed a good understanding of how carbon dioxide levels have varied in the atmosphere since that time. But there has been…

Bacteria outbreak due to ocean warming

Warming in Baltic Sea linked to Vibrio infection cases +++ Number of cases may rise as oceans warm, become less saline By Nina Chestney Reuters On July 22, 2012: Manmade climate change is the main driver behind the unexpected emergence of a group of bacteria in northern Europe which can cause gastroenteritis, new research by…

Research closes gap between Warming and CO2 Rise

Feedbacks in the climate system – in which warming is linked to natural CO2 increase, driving further warming – may operate faster than previously thought. ACE CRC: Researchers use Antarctic and Greenland ice cores to examine temperature and CO2 changes during the largest natural climate change in Earth’s recent climate history: the warming out of…

Geologic methane seeps along boundaries of Arctic permafrost thaw and melting glaciers

Release of 14C-depleted methane to the atmosphere from abundant gas seeps concentrated along boundaries of permafrost thaw and receding glaciers in Alaska and Greenland Nature Geoscience (2012) Abstract Methane, a potent greenhouse gas, accumulates in subsurface hydrocarbon reservoirs, such as coal beds and natural gas deposits. In the Arctic, permafrost and glaciers form a ‘cryosphere…

Carbon Dioxide and Climate: A Scientific Assessment

Landmark Report of an Ad Hoc Study Group on Carbon Dioxide and Climate – Woods Hole, Massachusetts to the Climate Research Board, Assembly of Mathematical and Physical Sciences, National Research Council, NATIONAL ACADEMY OF SCIENCES | Washington, D.C. 1979 We have examined the principal attempts to simulate the effects of increased atmospheric CO2 on climate.…

Changing Jet Streams May Alter Paths of Storms and Hurricanes

Hurricanes, whose development tends to be inhibited by jet streams, may become more powerful and more frequent as the jet streams move away from the sub-tropical zones where hurricanes are born. Stanford, CA—The Earth’s jet streams, the high-altitude bands of fast winds that strongly influence the paths of storms and other weather systems, are shifting—possibly…

Ozone Levels Drop When Hurricanes Are Strengthening

Hurricanes and Ozone June 11, 2005 Ozone levels drop when a hurricane is intensifying. Xiaolei Zou and Yonghui Wu, researchers at Florida State University found that variations of ozone levels from the surface to the upper atmosphere are closely related to the formation, intensification and movement of a hurricane. They studied ozone levels in 12 hurricanes…

Climate Change Linked to Ozone Loss: May Result in More Skin Cancer

A newly-discovered connection between climate change and depletion of the ozone layer over the U.S. could allow more damaging ultraviolet (UV) radiation to reach the Earth’s surface. As reported in a paper published in the July 27 issue of Science, a team of researchers led by James G. Anderson, the Philip S. Weld Professor of…

Arctic Amplification and Extreme Weather

The “Arctic Paradox” was coined during recent winters when speculations arose that the dramatic changes in the Arctic may be linked to severe snowstorms and cold temperatures in mid-latitudes, particularly along the U.S. east coast and in Europe. Recent studies have illuminated these linkages. Evidence is presented for a physical mechanism connecting Arctic Amplification —…