Diatoms Reveal Climate Changes Nov 19, 2009
Using diatoms in sediment from Swedish mountain lakes, Christina Jonsson, Department of Physical Geography and Quaternary Geology at Stockholm University, has studied changes in atmospheric circulation. Northern Sweden is sensitive to changes in atmospheric circulation since the region is affected by air masses of differing origin, from the North Atlantic, the Baltic, and the Arctic ... The dissertation enhances our knowledge of how changes in atmospheric circulation have impacted the climate in... (Science Daily)
Baked Australia: Water Management Lessons for the World from Down Under Nov 12, 2009
Lacking a substantial mountain range and abutted by the cold Antarctic waters of the Southern Ocean, precious little moisture fills its air without the help of variable atmospheric circulation patterns predicted to provide less precipitation to the region as global temperatures rise. Add to this decades of overextractions for dams, irrigation and urban use, and a devastating natural cycle is spun: Less water means more desiccated vegetation, leading to that reduce the land's ability to store... (Scientific American)
Ethiopia's Climate 27 Million Years Ago Had Higher Rainfall, Warmer Soil Oct 25, 2009
24, 2009) Thirty million years ago, before Ethiopia's mountainous highlands split and the Great Rift Valley formed, the tropical zone had warmer soil temperatures, higher rainfall and different atmospheric circulation patterns than it does today, according to new research of fossil soils found in the central African nation. See also. (Science Daily)
Volunteers wanted for simulated 520-day Mars mission... Oct 23, 2009
Volunteers wanted for simulated 520-day Mars mission. Volunteers wanted for simulated 520-day Mars mission. (The Drudge Report)
Workshop on Methane on Mars Oct 22, 2009
Atmospheric circulation and chemistry. Mechanisms for storage and release. (NASA Watch)
Sand Dunes Reveal Unexpected Dryness During Heavy Monsoon Oct 8, 2009
Part of the explanation may lie in local patterns of atmospheric circulation. At the peak of the summer monsoon, central China experiences both heavy summer rainfall and strong upward airflow. (Science Daily)
Logbooks from Darwin and Cook voyages used for climate study Oct 6, 2009
The Royal Navy ships' logbooks will also feed into a larger international project known as Acre (Atmospheric Circulation Reconstructions over the Earth), which aims to build historical climate records from observations only. Bookmark with. (BBC News -- UK)
'Killer' Southeast U.S. Drought Low On Scale, Says Study Oct 3, 2009
Instead, says Seager, dry spells appear to be generated by random changes in regional atmospheric circulation. This means weather could dry up at any time. (Science Daily)
October 2009 Geology and GSA Today highlights Oct 2, 2009
Climate modeling studies help explain these contrasting patterns of climate change, showing that atmospheric circulation associated with a strong monsoon may actually reduce precipitation in northern China's drylands. Warm summer temperatures from 11,500 to 8000 years ago may also have increased aridity at the desert margin. (EurekAlert!)
Air Pollutants From Abroad A Growing Concern Sep 30, 2009
In addition, the committee said that projected climate change will lead to a warmer climate and shifts in atmospheric circulation, likely affecting the patterns of emission, transport, transformation, and deposition for all types of pollution. However, predicting the net impacts of the potential changes is extremely difficult with present knowledge. (Science Daily)
The Troposphere Sep 20, 2009
Investigating the Layered Structure of the Earths Atmosphere. Like the planet itself, the atmosphere is layered. (Suite101.com)
Arctic sea ice reaches minimum extent for 2009, third lowest ever recorded Sep 18, 2009
Atmospheric circulation patterns helped the Arctic sea ice spread out in August to prevent another record-setting minimum, said Meier. But most of the 2009 September Arctic sea ice is thin first- or second-year ice, rather than thicker, multi-year ice that used to dominate the region, said Meier. (EurekAlert!)
El Niño, Global Warming Link Questioned; Possible Link Between 1918 El Niño And Flu Pandemic? Sep 16, 2009
(May 29, 2008) Fluctuations in sea-surface temperatures to the north of Australia and changes in atmospheric circulation patterns over the sub-tropical Indian Ocean have been identified as key factors leading to. . (Science Daily)
Ozone: More UV Radiation In Tropics, Antarctica Sep 16, 2009
Using a sophisticated computer model, Hegglin and U of T physicist Theodore Shepherd determined that 21st-century climate change will alter atmospheric circulation, increasing the flux of ozone from the upper to the lower atmosphere and shifting the distribution of ozone within the upper atmosphere. The result will be a change in the amount of UV radiation reaching the Earth s surface which varies dramatically between regions: e.g. up to a 20 per cent increase in UV radiation over southern high... (Science Daily)
Federal Agency Advances Walrus Listing Petition Sep 9, 2009
The center reports ice extent declined more slowly in the first part of August this year due to a recent atmospheric circulation pattern, which transported ice toward the Siberian coast and discouraged export of ice out of the Arctic Ocean. The center said it was unlikely that 2009 will see a record low extent but the minimum summer ice will still be much lower than the 1979 to 2000 average. (W-USA News, DC)
Old Moon Discovery Helps Unlock Earth Ocean Secrets Sep 3, 2009
14, 2007) A team of NASA and university scientists has detected an ongoing reversal in Arctic Ocean circulation triggered by atmospheric circulation changes that vary on decade-long time scales. The results. (Science Daily)
Satellites and submarines give the skinny on sea ice thickness Sep 2, 2009
A single extreme melt or freeze season may be the result of any number of seasonal factors, from storminess to the Arctic Oscillation (variations in atmospheric circulation over the polar regions that occur on time scales from weeks to decades). But climate is not the same as weather. (EurekAlert!)
Human impacts and environmental factors are changing the northwest Atlantic ecosystem Sep 1, 2009
The community structure of zooplankton, a major food source for whales and many other marine species including fish, has changed, due in part to climate and physical processes acting over the North Atlantic Basin, indicating the importance of winds and atmospheric circulation patterns to the function and structure of this ecosystem. Species-selective harvesting patterns have also contributed to shifts in the composition of the ecosystem, which is now dominated by small pelagic fishes such as... (EurekAlert!)
Small fluctuations in solar activity, large influence on the climate Aug 28, 2009
1 per cent. Complex interplay mechanisms in the stratosphere and the troposphere, however, create measurable changes in the water temperature of the Pacific and in precipitation". Top Down - Bottom up In order for such reinforcement to take place many small wheels have to interdigitate. The initial process runs from the top downwards: increased solar radiation leads to more ozone and higher temperatures in the stratosphere. "The ultraviolet radiation share varies much more strongly than the... (EurekAlert!)
Venus spot continues to puzzle Aug 11, 2009
As it stands with the current information available, it seems that the most likely and natural explanation for the local brightening was caused by perturbations in the atmospheric circulation. "In other words, the observers witnessed Venus weather," concludes the report. (Astronomy Now Online)
Cloud Changes May Worsen Global Warming Jul 24, 2009
All models predict a warming ocean, but if they don't have the correct relationship between clouds and atmospheric circulation, they won't produce a realistic cloud response. "I am optimistic that there will be major progress in understanding global cloud changes during the next several years," said Norris. (Science Daily)
Solar Cycle Linked To Global Climate Jul 18, 2009
(May 29, 2008) Fluctuations in sea-surface temperatures to the north of Australia and changes in atmospheric circulation patterns over the sub-tropical Indian Ocean have been identified as key factors leading to. (Feb. (Science Daily)
Earth's most prominent rainfall feature creeping northward Jul 2, 2009
"In addition many other people who live in the tropics but farther afield from the Pacific could be affected because this band of rain shapes atmospheric circulation patterns throughout the world.". The band of rainfall happens at what is called the intertropical convergence zone. (EurekAlert!)
Water on Mars Jun 26, 2009
"Groundwater that has been out of atmospheric circulation for eons will be very salty," Dr. Grimm stated. "it is a near-ideal exploration target for inductive systems." He added. (Suite101.com)
New instrument has potential to detect water deep underground on Mars Jun 25, 2009
"Groundwater that has been out of atmospheric circulation for eons will be very salty," says the project's principal investigator Dr. Robert Grimm, a director in the Space Science and Engineering Division at Southwest Research Institute. "It is a near-ideal exploration target for inductive systems.". (EurekAlert!)
Predicting Droughts With Greater Certainty Jun 4, 2009
ScienceDaily (June 3, 2009) Using new data and reconstructions of the Dust Bowl drought in America during the 1930s, climatologists at the ETH have shown for the first time a three-dimensional picture of the atmospheric circulation that led to the drought ... Scientists have been studying the Dust Bowl phenomenon for decades, and until now the mechanisms that caused this exceptionally long period of drought have not been fully understood, as little information has been available on the... (Science Daily)
Toxic 'carbon tet' lingers in air near schools May 20, 2009
"The fact that you still find it in the air is not that surprising." What has happened, Mitchell says, is that atmospheric circulation mixes carbon tetrachloride into air throughout the world, creating a fairly steady level globally. Elevated levels across the USA. (USA Today -- Tech)
Andes Mountains Older Than Previously Believed May 17, 2009
29, 2009) The interplay between tectonic deformation, uplift and erosive processes creates the topography of mountain ranges, which, in turn, influences atmospheric circulation patterns and the distribution of. (Mar. (Science Daily)
AGU Journal highlights -- May 6, 2009 May 7, 2009
Analysis of unusual atmospheric circulation during the Dust Bowl may help predict Midwest droughts ... Using historical upper air data, reconstructions, and model simulations, Brnnimann et al. analyze atmospheric circulation during the Dust Bowl, focusing on features thought to be critical to understanding Dust Bowl droughts ... Title: Exceptional atmospheric circulation during the "Dust Bowl". (EurekAlert!)
* Too much hot air,too little action Apr 30, 2009
Although the research station is far from major sources of human pollution, atmospheric circulation brings air from Europe and North America into the Arctic region. There is less human influence here and most of the pollution comes straight here at this time of the year. (Taipei Times, Taiwan -- World Business)
Natural Cycle Linked to Past and Present Global Warming Cycles: Earth Now Entering Global Cooling for the Next 180 Years Apr 16, 2009
The shifts of nearly 4 degrees of latitude, or approximately 380 kilometers (240 miles) results in an overall change in the atmospheric circulation in such a manner to cause the climate to migrate northward during global warming cycles and allow some melting of high latitude snow and ice packs, and a rises in atmospheric carbon dioxide levels through a very complex natural feedback system ... atmospheric circulation. (Yahoo News -- Press Releases)
Uneven Ozone Recovery In Warmer Climate? Apr 12, 2009
Climate Change And Atmospheric Circulation Will Make For Uneven Ozone Recovery ... Climate Change And Atmospheric Circulation Will Make For Uneven Ozone Recovery. (Science Daily)
Climate change and atmospheric circulation will make for uneven ozone recovery Apr 11, 2009
Public release date: 10-Apr-2009. Contact: Sarah DeWitt. (EurekAlert!)
Solar Activity And Climate Change: New Sun-Watching Satellite To Monitor Sunlight Fluctuations Mar 30, 2009
13, 2001) A new NASA computer climate model reinforces the long-standing theory that low solar activity could have changed the atmospheric circulation in the Northern Hemisphere from the 1400's to the. (July 23, 2004) Scientists using measurements from NASA's Solar Radiation and Climate Experiment (SORCE) satellite have discovered that Venus and sunspots have something in common: they both block some of the. (Science Daily)
Ozone: New Simulation Shows Consequences Of A World Without Earth's Natural Sunscreen Mar 20, 2009
" Their "world avoided" simulation took months of computer time to process. The team started with the Goddard Earth Observing System Chemistry-Climate Model (GEOS-CCM), an earth system model of atmospheric circulation that accounts for variations in solar energy, atmospheric chemical reactions, temperature variations and winds, and other elements of global climate change. For instance, the new model accounts for how changes in the stratosphere influence changes in the troposphere (the air masses... (Science Daily)
PHOTOS: Five Global Warming "Tipping Points" Mar 18, 2009
In the Amazon Basin, climate shifts may lead to less rainfall, causing a large loss of species diversity--crippling the forest's ability to help maintain the region's air quality, fresh water cycle, and atmospheric circulation. Between 2005 and 2006, 43 international climate experts volunteered to evaluate each of five tipping points, presented here--specifically, judging the likelihood that achieving a tipping point would lead to potentially dangerous global warming. (National Geographic)
Stalagmites Confirm 9,000-Year Lower Brazil Rainfall Feb 28, 2009
In their paper published recently in Nature Geoscience, Burns and co-investigators Francisco Cruz of the University of Sao Paolo and Mathias Vuille of the State University of New York, Albany, say they have discovered an unexpected east-west atmospheric circulation pattern that fits their new data and explains the Nordeste anomaly ... The reason for the unusual rainfall pattern, with opposite dry and wet periods than expected, turned out to be a heretofore unobserved change in zonal (east-west)... (Science Daily)
Ice Declining Faster Than Expected In Both Arctic And Antarctic Glaciers Feb 26, 2009
Snow and ice are declining in both polar regions, affecting human livelihoods as well as local plant and animal life in the Arctic, as well as global ocean and atmospheric circulation and sea level. See also. (Science Daily)
