Sentences with phrase «september ozone hole»

«First signs of healing in the Antarctic ozone layer: September ozone hole has shrunk by 4 million square kilometers since 2000.»

The team found that the September ozone hole has shrunk by more than 4 million square kilometers — about half the area of the contiguous United States — since 2000, when ozone depletion was at its peak.

Not exact matches

Using satellites, ground - based instruments, and ozone - measuring weather balloons, they showed that since 2000, the September hole shrunk by 4 million square kilometers — an area bigger than India.

In September, the ozone hole is at its largest because the cold winter months coupled with the returning daylight permit stratospheric cloud formations that do the most damage to the ozone layer.

The ozone hole, depicted in red, begins forming every year in early September, when the spring sunlight ends Antarctica's long, dark winters.

Weather balloon measurements and other data showed that last September, the ozone hole was 4 million square kilometers smaller than its peak size.

The images above show the Antarctic ozone hole on September 16 (the International Day for the Preservation of the Ozone Layer) in the years 1979, 1987, 2006, and ozone hole on September 16 (the International Day for the Preservation of the Ozone Layer) in the years 1979, 1987, 2006, and Ozone Layer) in the years 1979, 1987, 2006, and 2011.

The researchers tracked the yearly opening of the Antarctic ozone hole in the month of September, from 2000 to 2015.

Solomon and her colleagues believed they would get a clearer picture of chlorine's effects by looking earlier in the year, at ozone levels in September, when cold winter temperatures still prevail and the ozone hole is opening up.

The Antarctic ozone hole forms and expands during the Southern Hemisphere spring (August and September) because of the high levels of chemically active forms of chlorine and bromine in the stratosphere.

The largest ozone hole ever seen has opened up over Antartica, a sign that ozone - depleting gases churned out years ago are just now coming to their peak, NASA scientists reported September 8, 2000.

Their measurements, focusing on a time period in September each year — during which time the colder temperatures in the atmosphere promote the reactions that destroy ozone so that the hole is opening up — show that since 2000, the hole has shrunk by 1.7 million square miles, an area more than half the size of the continental United States.

Figure 2: Total column ozone loss relative to pre-ozone hole conditions in the 1970s in percent (left) and total number of molecules (right)(1 DU = 2.69 molecules / cm2) averaged over 2010 - 2019, during September for the Southern Hemisphere and March for the Northern Hemisphere.

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Suddenly on September 25, 2002, a broad accumulation of ozone briefly overpowered that year's ozone hole.

In the early 1980s, scientists discovered a hole in the ozone layer that forms over Antarctica during the Southern Hemisphere's spring months, from September to November.

Models suggest that both the loss of ozone (the ozone hole that occurs in September / October every year) and increases in greenhouse gases lead to an increase in frequency of this climate pattern.