[QODLink]
Weather
Blowing in the wind - glacial flour
Dust formed from the action of glaciers on underlying rock blows from Alaska into the Pacific Ocean.
Last Modified: 07 Nov 2012 10:13

Glacial dust blowing into the Gulf of Alaska. [GALLO/GETTY]

Most people are aware of dust in the atmosphere. It produces a whitish haze, reducing visibility at times. Deposits of dust occur when it rains and reddish dust from North Africa occasionally falls across France and the UK when the winds are from a southerly direction.

The dust is known to have an effect on weather systems. Huge amounts of dust blow from the Sahara desert across the Atlantic Ocean. Some 60 to 200 million tons travel across the Atlantic Ocean every year. It is known that that the dust has a negative impact on hurricane formation.

Another source of atmospheric dust is less well known . The NASA above shows glacial dust, known as flour, drifting southwestwards from the Copper River delta and extending more than 100km southwestwards into the Gulf of Alaska.

This dust, which results from the grinding action of glaciers on the underlying bedrock, adds to atmospheric pollution. Studies are taking place to examine the likely effect this dust will have on human health. It is thought that, as glacial retreat continues, the quantity of glacial flour in the atmosphere will increase significantly.

208

Featured on Al Jazeera
Swathes of the British electorate continue to show discontent with all things European, including immigration.
Astronomers have captured images of primordial galaxies that helped light up the cosmos after the Big Bang.
Critics assail British photographer's portrayal of indigenous people, but he says he's highlighting their plight.
As Western stars re-release 1980s charity hit, many Africans say it's a demeaning relic that can do more harm than good.
Featured
No one convicted after 58 people gunned down in cold blood in 2009 in the country's worst political mass killing.
While hosting the World Internet Conference, China tries Tiananmen activist for leaking 'state secrets' to US website.
Once staunchly anti-immigrant, some observers say the conservative US state could lead the way in documenting migrants.
NGOs say women without formal documentation are being imprisoned after giving birth in Malaysia.
Public stripping and assault of woman and rival protests thereafter highlight Kenya's gender-relations divide.