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Latest Stratospheric sulfur aerosols Stories

2011-04-14 15:28:30

Scientists have known for decades that black carbon aerosols add to global warming. These airborne particles made of sooty carbon are believed to be among the largest man-made contributors to global warming because they absorb solar radiation and heat the atmosphere. New research from Carnegie's Long Cao and Ken Caldeira, along with colleagues George Ban-Weiss and Govindasamy Bala, quantifies how black carbon's impact on climate depends on its altitude in the atmosphere. Their work, published...

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2011-02-22 05:40:00

NASA is scheduled to launch its latest Earth-orbiting satellite -- Glory -- in the predawn hours early Wednesday in what is to be a $424 million mission to observe and analyze airborne particles emitted from volcanoes, forest fires, smokestacks and tailpipes. The satellite will be launched from Vandenberg Air Force Base in Santa Barbara County, California. It will be carried by a Taurus XL rocket into space about 440 miles above Earth, where it will join a fleet of satellites that has been...

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2011-02-18 09:27:10

Climatologists have known for decades that airborne particles called aerosols can have a powerful impact on the climate. However, pinpointing the magnitude of the effect has proven challenging because of difficulties associated with measuring the particles on a global scale. Soon a new NASA satellite -- Glory -- should help scientists collect the data needed to provide firmer answers about the important particles. In California, engineers and technicians at Vandenberg Air Force Base are...

2011-02-14 22:10:20

Shipping, China top emissions growth in new analysis of 150 years of emissions A new analysis of sulfur emissions appearing in the journal Atmospheric Chemistry and Physics shows that after declining for a decade, worldwide emissions rose again in 2000 due largely to international shipping and a growing Chinese economy. An accurate read on sulfur emissions will help researchers predict future changes in climate and determine present day effects on the atmosphere, health and the environment....

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2011-01-24 10:15:00

Could Dimming the Sun Change Teleconnections in Weather Patterns as we Know Them? Solar radiation management projects, also known as sun dimming, seek to reduce the amount of sunlight hitting the Earth to counteract the effects of climate change. Global dimming can occur as a side-effect of fossil fuels or as a result of volcanic eruptions, but the consequences of deliberate sun dimming as a geoengineering tool are unknown. A new study by Dr Peter Braesicke, from the Centre for Atmospheric...

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2010-07-02 11:16:37

Dozens of scientists descended on Sacramento, Calif., in June hoping for what most of us don't want to see during hot summer days: thick, sooty haze. The team of some sixty researchers from across the country and several universities and government agencies -- including NASA scientists and aircraft -- took to the skies to sort out one of the stickiest questions in climate science: What effects do tiny aerosol particles in that haze --particularly those containing carbon -- have on the Earth's...

2010-06-16 23:22:39

Haze, scientifically known as atmospheric aerosols - microscopic particles suspended in the Earth's atmosphere - represents a major environmental problem because it degrades visibility, affects human health and influences the climate. Despite its profound impacts, how the haze is formed is not fully understood, says a Texas A&M University professor of atmospheric sciences and chemistry who has studied air chemistry for more than 20 years. Professor Renyi Zhang published his work in the...

2010-06-02 20:39:26

Airplanes, ground instruments, and weather balloons to study effect of airborne particles on climate More than 60 scientists from a dozen institutions have converged on this urban area to study how tiny particles called aerosols affect the climate. Sending airplanes and weather balloons outfitted with instruments up in the air, the team will be sampling aerosols in the Sacramento Valley from June 2-28. Researchers from the Department of Energy's Pacific Northwest National Laboratory in...

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2010-05-27 10:45:34

The large number of tiny organic aerosols floating in the atmosphere "“ emitted from tailpipes and trees alike "“ share enough common characteristics as a group that scientists can generalize their makeup and how they change in the atmosphere. The groundbreaking research by Colette Heald, assistant professor in the Department of Atmospheric Science at Colorado State University, was highlighted this month on the cover of the American Geophysical Union's prestigious Geophysical...

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2010-05-02 07:57:56

NSF-supported climate scientist Mark Flanner and colleagues find differences in the rates for spring warming and snow cover decline in Eurasia and North America, and are studying whether aerosols are a key factor Over the past 30 years, springtime snow melt and warming appear to be proceeding at a faster rate in Eurasia than in North America. Climate scientist Mark Flanner, an assistant professor at the University of Michigan and a recent Advanced Study Program graduate at the National...


Word of the Day
grass-comber
  • A landsman who is making his first voyage at sea; a novice who enters naval service from rural life.
According to the OED, a grass-comber is also 'a sailor's term for one who has been a farm-labourer.'