Towards a drastically greener Arctic

Posted by Thomas Anderson

Scientists are currently predicting that rising temperatures will lead to a massive "greening," or increase in plant cover, in the Arctic.

Indeed, new models project that wooded areas in the Arctic could increase by as much as 50 percent over the next few decades - accelerating climate warming at a rate greater than previously expected.

"Such widespread redistribution of Arctic vegetation would have impacts that reverberate through the global ecosystem," explained Richard Pearson of Natural History's Center for Biodiversity and Conservation.

"[To be sure], plant growth in Arctic ecosystems has increased over the past few decades, a trend that coincides with increases in temperatures, which are rising at about twice the global rate."

According to Pearson, the team used climate scenarios for the 2050s to explore how this trend is likely to continue in the future. The scientists developed models that statistically predict the types of plants that could grow under certain temperatures and precipitation.

"Although it comes with some uncertainty, this type of modeling is a robust way to study the Arctic because the harsh climate limits the range of plants that can grow, making this system simpler to model compared to other regions such as the tropics," he said.

The models reveal the potential for massive redistribution of vegetation across the Arctic under future climate, with about half of all vegetation switching to a different class and a massive increase in tree cover.

What might this look like? In Siberia, for instance, trees could grow hundreds of miles north of the present tree line.

"These impacts would extend far beyond the Arctic region," Pearson confirmed. "For example, some species of birds seasonally migrate from lower latitudes and rely on finding particular polar habitats, such as open space for ground-nesting."

In addition, the researchers investigated the multiple climate change feedbacks that greening would produce. They found that a phenomenon called the albedo effect, based on the reflectivity of the Earth's surface, would have the greatest impact on the Arctic's climate.

When the sun hits snow, most of the radiation is reflected back to space. But when it hits an area that's "dark," or covered in trees or shrubs, more sunlight is absorbed in the area and temperature increases. This has a positive feedback to climate warming: the more vegetation there is, the more warming will occur.

"By incorporating observed relationships between plants and albedo, we show that vegetation distribution shifts will result in an overall positive feedback to climate that is likely to cause greater warming than has previously been predicted," added Scott Goetz of the Woods Hole Research Center.