Latest Dobson unit Stories

2007-10-03 10:40:00

The ozone hole over Antarctica has shrunk 30 percent as compared to last year's record size. According to measurements made by ESA's Envisat satellite, this year's ozone loss peaked at 27.7 million tonnes, compared to the 2006 record ozone loss of 40 million tonnes. Ozone loss is derived by measuring the area and the depth of the ozone hole. The area of this year's ozone hole "“ where the ozone measures less than 220 Dobson Units "“ is 24.7 million sq km, roughly the size of North...

2006-10-20 15:50:00

WASHINGTON -- This year's Antarctic ozone hole is the biggest ever, government scientists said Thursday. The so-called hole is a region where there is severe depletion of the layer of ozone - a form of oxygen - in the upper atmosphere that protects life on Earth by blocking the sun's ultraviolet rays. Scientists say human-produced gases such as bromine and chlorine damage the layer, causing the hole. That's why many compounds such as spray-can propellants have been banned in recent years....

2006-10-02 17:25:00

Ozone measurements made by ESA's Envisat satellite have revealed the ozone loss of 40 million tonnes on 2 October 2006 has exceeded the record ozone loss of about 39 million tonnes for 2000. Ozone loss is derived by measuring the area and the depth of the ozone hole. The size of this year's ozone hole is 28 million square km, nearly as large as the record ozone hole extension during 2000, and the depth of the ozone hole is around 100 Dobson Units, rivalling the record low ozone values in...

2005-12-06 18:06:09

NASA's 2005 assessment of the size and thickness of the ozone layer was the first based on observations from the Ozone Monitoring Instrument on the agency's Aura spacecraft. Aura was launched in 2004. This year's ozone hole measured 9.4 million square miles at its peak between September and mid-October, which was slightly larger than last year's peak. The size of the ozone hole in 1998, the largest ever recorded, averaged 10.1 million square miles. For 10 of the past 12 years, the Antarctic...

2005-10-18 11:50:44

GENEVA (Reuters) - Depletion of the ozone layer above Antarctica, caused by emissions of industrial chemicals, seems to have peaked, indicating that global environmental pacts were working, U.N. scientists said on Tuesday. The seasonal hole above the South Pole and Antarctica is now shrinking after falling short of the record years of 2003 and 2000, the United Nations' World Meteorological Organization (WMO) said in its latest bulletin. It peaked at 26.9 million sq kms on September...

2005-08-30 13:57:14

A new global study involving long-term data from satellites and ground stations indicates Earth's ozone layer, while still severely depleted following decades of thinning from industrial chemicals in the atmosphere, is no longer in decline. Betsy Weatherhead, a researcher with the Cooperative Institute for Research in Environmental Sciences, a joint institute of the University of Colorado at Boulder and the National Oceanic and Atmospheric Administration and corresponding author of the...

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