The cold truth about climate change and snow

Dec 05, 2005
The cold truth about climate change and snow

What would the Earth be like if one fine day all the snow melted away?
Obviously, it would be a much warmer place. But what's interesting is how much warmer, says Stephen Vavrus, an associate scientist at the Center for Climatic Research at the University of Wisconsin-Madison.

Image: If all the planet's snow were to melt away, Earth would on average be around eight-tenths of a degree Celsius warmer, according to Stephen Vavrus, an associate scientist at the Center for Climatic Research at the University of Wisconsin-Madison. Vavrus generated computer simulations of a snow-free world to assess snow's impact on several climatic variables such as temperature and atmospheric circulation. This map illustrates the effects across the globe. Graphic: Stephen Vavrus, Center for Climatic Research

Working with computer-generated simulations, Vavrus found that in the absence of snow cover, global temperatures would likely spike by about eight-tenths of a degree Celsius. That increase represents as much as a third of the warming that climate change experts have predicted, should levels of heat-trapping greenhouse gases double.

"This was not just a what-if question," says Vavrus, whose work comes amidst mounting reports on the steady melt of Arctic ice. "I wanted to quantify the influence of global snow cover on the present-day climate because that has relevance for the type of climate changes we are expecting in the future." Vavrus will discuss his findings today during the fall meeting of the American Geophysical Union (Dec. 5-9, 2005).

Vavrus, a climate modeling specialist, digitally simulated a snow-free world, and measured the impact of missing snow cover on a range of climatic variables including soil temperatures, cloud cover, atmospheric circulation patterns and soil moisture levels.

Aside from his temperature-related projections, Vavrus also made the counterintuitive finding that in the absence of snow, total regions of permafrost-the permanently frozen soil of the cold north-are likely to expand in area. Without the insulating effect of snow, in other words, soils in colder regions of the world are in fact likely to get much colder. The surprising result has implications for the health of permafrost-associated ecosystems, and may influence decisions in the field of construction.

Already, permafrost changes have triggered structural problems in Alaskan buildings and roadways, says Vavrus, and "there's every reason to think we'll see even stronger effects in the future," he adds.

In forthcoming simulations, Vavrus plans to continue exploring the effects of both nearby and faraway snow cover on local climate conditions.

Source: University of Wisconsin

Explore further: Computer model shows moon's core surrounded by liquid and it's caused by Earth's gravity

add to favorites email to friend print save as pdf

Related Stories

Recommended for you

Comet Jacques makes a 'questionable' appearance

8 hours ago

What an awesome photo! Italian amateur astronomer Rolando Ligustri nailed it earlier today using a remote telescope in New Mexico and wide-field 4-inch (106 mm) refractor. Currently the brightest comet in ...

Image: Our flocculent neighbour, the spiral galaxy M33

8 hours ago

The spiral galaxy M33, also known as the Triangulum Galaxy, is one of our closest cosmic neighbours, just three million light-years away. Home to some forty billion stars, it is the third largest in the ...

Titan offers clues to atmospheres of hazy planets

8 hours ago

When hazy planets pass across the face of their star, a curious thing happens. Astronomers are not able to see any changes in the range of light coming from the star and planet system.

Having fun with the equation of time

8 hours ago

If you're like us, you might've looked at a globe of the Earth in elementary school long before the days of Google Earth and wondered just what that strange looking figure eight thing on its side was.

User comments : 0