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Study clearly links greenhouse gases with heat waves

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The 2012 U.S. heat wave was notable for its breadth.

‘We’re not optimally adapted to that new climate … ‘

By Summit Voice

FRISCO — Extreme weather, including heat waves, is four times more likely in the north-central and northeastern U.S. than it was in the pre-industrial era, according to Stanford researchers.

The study closely looked at the physical processes that create hazardous weather, including a crop-shriveling midwestern drought and the widespread 2012 U.S. heat wave.

In 2012 alone, the United States experienced 11 extreme weather events that each caused at least $1 billion in damage.

“It’s clear that our greenhouse gas emissions have increased the likelihood of some kinds of extremes, and it’s clear that we’re not optimally adapted to that new climate,” said Noah Diffenbaugh, a Stanford associate professor of environmental Earth system science.

Diffenbaugh, along with research assistant Martin Scherer, found strong evidence that the high levels of greenhouse gases now in the atmosphere have increased the likelihood of severe heat such as occurred in the United States in 2012.

Using climate models, they quantified how the risk of such damaging weather has changed in the current climate of high greenhouse gas concentrations, as opposed to an era of significantly lower concentrations and no global warming. Their findings don’t pinpoint global warming as the cause of particular extreme weather events, but they do reveal the increasing risk of such events as the world warms.

“Going forward, if we want to understand and manage climate risks, it’s more practically relevant to understand the likelihood of the hazard than to ask whether any particular disaster was caused by global warming,” Diffenbaugh said.

Diffenbaugh cautioned against trying to determine whether global warming caused any individual extreme event. But the observed global warming clearly appears to have affected the likelihood of record heat, the researchers said.

The study, looking at the likelihood of July 2012 U.S. temperatures recurring, is part of a larger report edited by scientists at the National Oceanic and Atmospheric Administration (NOAA) and published Sept. 5 in the Bulletin of the American Meteorological Society. The report includes studies of a dozen 2012 extreme weather events by research teams around the world, about half of which found some evidence that human-caused climate change contributed to an extreme weather event.

Close study of extreme weather events can help quantify the likelihood that society will face conditions similar to those that occurred in the summer of 2012, thereby informing efforts to reduce vulnerability and increase resilience. Diffenbaugh argues that the new results can also help to quantify the true cost of emissions to society, since the cost of the disaster is measurable.

“Knowing how much our emissions have changed the likelihood of this kind of severe heat event can help us to minimize the impacts of the next heat wave, and to determine the value of avoiding further changes in climate,” Diffenbaugh said.

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