"Scientists connect global warming to floods"

AP story as seen the the heraldtimesonline.com:

Extreme rainstorms and snowfalls have grown substantially stronger, two studies suggest, with scientists for the first time finding the telltale fingerprints of man-made global warming on downpours that often cause deadly flooding.

Two studies in Wednesday’s issue of the journal Nature link heavy rains to increases in greenhouse gases more than ever before.

One group of researchers looked at the strongest rain and snow events of each year from 1951 to 1999 in the Northern Hemisphere and found that the more recent storms were 7 percent wetter. That may not sound like much, but it adds to a substantial increase, said the report from a team of researchers from Canada and Scotland.

The study didn’t single out specific storms but examined worst-of-each-year events all over the Northern Hemisphere. While the study ended in 1999, the close of the decade when scientists say climate change kicked into a higher gear, the events examined were similar to more recent disasters: deluges that triggered last year’s deadly floods in Pakistan and in Nashville, Tenn., and this winter’s paralyzing blizzards in parts of the United States.

The change in severity was most apparent in North America, but that could be because that’s where the most rain gauges are, scientists said.

Both studies should weaken the argument that climate change is a “victimless crime,” said Myles Allen of the University of Oxford. He co-authored the second study, which connected flooding and climate change in the United Kingdom.

Jonathan Overpeck, a University of Arizona climate scientist, who didn’t take part in either study, praised them as sensible and “particularly relevant given the array of extreme weather that we’ve seen this winter and stretching back over the last few years.”

Not all the extreme rain and snow events the scientists studied cause flooding. But since 1950, flooding has killed more than 2.3 million people, according to the World Health Organization’s disaster database.

The British study focused on flooding in England and Wales in the fall of 2000. The disaster cost more than $1.7 billion in insured damages and was the wettest autumn for the region in more than 230 years of record-keeping.

Researchers found that global warming more than doubled the likelihood of that flood occurring.

For years, scientists, relying on basic physics and climate knowledge, have said global warming would likely cause extremes in temperatures and rainfall. But this is the first time researchers have been able to point to a demonstrable cause-and-effect.

The scientists took information that shows an increase in extreme rain and snow events from the 1950s through the 1990s and ran dozens of computer models numerous times. They put in the effects of greenhouse gases — which come from the burning of fossil fuels — and then ran numerous models without those factors.

Only when the greenhouse gases are factored in do the models show a similar increase to what actually happened. All other natural effects alone don’t produce the jump in extreme rainfall.

In fact, the computer models underestimated the increase in extreme rain and snow. That is puzzling and could be even more troubling for our future, said Michael Oppenheimer of Princeton University, who wasn’t part of the study.

Most of the 10 outside climate experts who reviewed the papers for the Associated Press called the research sound and strong.