Did climate change cause Hurricane Sandy? This series of powerpoint slides is based on an article by Mark Fischetti in Scientific American for October 30, 2012.

The hedge expressed by journalists is that many variables go into creating a big storm, so the size of Hurricane Sandy, or any specific storm, cannot be attributed to climate change. That’s true, and it’s based on good science. However, that statement does not mean that we cannot say that climate change is making storms bigger. It is doing just that—a statement also based on good science, and one that the insurance industry is embracing, by the way. (Huh? More on that in a moment.)

Scientists have long taken a similarly cautious stance, but more are starting to drop the caveat and link climate change directly to intense storms and other extreme weather events, such as the warm 2012 winter in the eastern U.S. and the frigid one in Europe at the same time.

…researchers have gotten very good in the past decade at determining what affects the variables that create big storms. Hurricane Sandy got large because it wandered north along the U.S. coast, where ocean water is still warm this time of year, pumping energy into the swirling system. But it got even larger when a cold Jet Stream made a sharp dip southward from Canada down into the eastern U.S. The cold air, positioned against warm Atlantic air, added energy to the atmosphere and therefore to Sandy, just as it moved into that region, expanding the storm even further.

Recent research by Charles Greene at Cornell University and other climate scientists has shown that as more Arctic sea ice melts in the summer—because of global warming—the NAO is more likely  to be negative during the autumn and winter. A negative NAO makes the Jet Stream more likely to move in a big, wavy pattern across the U.S., Canada and the Atlantic, causing the kind of big southward dip that occurred during Sandy. (NAO is the North Atlantic Oscillation referring to atmospheric pressure)

Climate Change and Drought In a recent op-ed in the Washington Post, James Hansen at NASA’s Goddard Institute for Space Studies in New York blamed climate change for excessive drought, based on six decades of measurements, not computer models: “Our analysis shows that it is no longer enough to say that global warming will increase the likelihood of extreme weather and to repeat the caveat that no individual weather event can be directly linked to climate change. To the contrary, our analysis shows that, for the extreme hot weather of the recent past, there is virtually no explanation other than climate change.”

He went on to write that the Russian heat wave of 2010 and catastrophic droughts in Texas and Oklahoma in 2011 could each be attributed to climate change, concluding that “The odds that natural variability created these extremes are minuscule, vanishingly small.

Relation of warmer ocean and stronger hurricanes Indeed, if you’re a regular Scientific American reader, you might recall that another well-regarded scientist predicted behemoths such as Sandy in 2007. The article, by Kevin Trenberth, a senior scientist at the National Center for Atmospheric Research, was presciently titled, “Warmer Oceans, Stronger Hurricanes.” Trenberth’s extensive analysis concluded that although the number of Atlantic hurricanes each year might not rise, the strength of them would.

Is there a link of climate change and storms? Hurricane Sandy has emboldened more scientists to directly link climate change and storms, without the hedge. On Monday, as Sandy came ashore in New Jersey, Jonathan Foley, director of the Institute on the Environment at the University of Minnesota, tweeted: “Would this kind of storm happen without climate change? Yes. Fueled by many factors. Is [the] storm stronger because of climate change? Yes.”

Raymond Bradley, director of the Climate Systems Research Center at the University of Massachusetts, was quoted in the Vancouver Sun saying: “When storms develop, when they do hit the coast, they are going to be bigger and I think that’s a fair statement that most people could sign onto.”

Insurance Company perspective Munich Re, one of the world’s largest reinsurance firms, issued a study titled “Severe Weather in North America.” According to the press release that accompanied the report, “Nowhere in the world is the rising number of natural catastrophes more evident than in North America.” … While many factors have contributed to this trend, including an increase in the number of people living in flood-prone areas, the report identified global warming as one of the major culprits: “Climate change particularly affects formation of heat-waves, droughts, intense precipitation events, and in the long run most probably also tropical cyclone intensity.”

Is Hurricane Sandy an illustration of environmental surprise? Yes No There is not enough evidence yet to be definitive