Ozone May Play Larger Role In Warming At High Latitudes Than Thought

[hatrack]

WASHINGTON - Ozone pollution in the Northern Hemisphere, churned out by factories and vehicles that burn fossil fuels, is a major factor in the dramatic warming of the Arctic zone, NASA climate scientists reported on Tuesday. This finding is surprising, since ozone has been considered a minor player in the study of global climate change, according to Drew Shindell, a research scientist at NASA's Goddard Institute for Space Studies in New York City.

Carbon dioxide has long been considered a key cause of overall global warming, because it remains in the atmosphere for a long time, Shindell said in a telephone interview. But ozone - the damaging, heat-trapping tropospheric ozone encountered at lower levels of the atmosphere, as opposed to the protective ozone observed at higher altitude - was seen as fairly perishable and therefore less of a factor, he said.

Globally, ozone accounts for perhaps one-seventh of the global warming and climate change that carbon dioxide does, Shindell said. However, a new study of climate change over the past 100 years indicates that ozone may be responsible for as much as 50 percent of the warming in the Arctic zone.

This is because many of the world's most highly industrialized nations are in the Northern Hemisphere, and at relatively high latitudes. For most of the year, that means the ozone produced in these countries is blown by prevailing winds north and east, toward the Arctic Circle.

EDIT

http://www.planetark.com/dailynewsstory.cfm/newsid/35643/story.htm

[bemildred]

1. Dang, it just always turns out to be more complicated than we thought.

Sigh.