Claim: Extreme weather can be blamed on climate via statistics

Here is a photo of statisticians attributing weather events to CO2 and/or climate change.

If you need more of an explanation of the problem of using statistics for causality attribution, Statistician to the Stars Matt Briggs has addressed this issue in detail here.

The media release is below.

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Was that climate change?
Linking extreme weather to global warming

STANFORD’S SCHOOL OF EARTH, ENERGY & ENVIRONMENTAL SCIENCES

After an unusually intense heatwave, downpour or drought, Noah Diffenbaugh and his research group inevitably receive phone calls and emails asking whether human-caused climate change played a role.

“The question is being asked by the general public and by people trying to make decisions about how to manage the risks of a changing climate,” said Diffenbaugh, a professor of Earth system science at Stanford’s School of Earth, Energy & Environmental Sciences. “Getting an accurate answer is important for everything from farming to insurance premiums, to international supply chains, to infrastructure planning.”

In the past, scientists typically avoided linking individual weather events to climate change, citing the challenges of teasing apart human influence from the natural variability of the weather. But that is changing.

“Over the past decade, there’s been an explosion of research, to the point that we are seeing results released within a few weeks of a major event,” said Diffenbaugh, who is also the Kimmelman Family Senior Fellow at the Stanford Woods Institute for the Environment.

In a new study, published in this week’s issue of Proceedings of the National Academy of Sciences, Diffenbaugh and a group of current and former Stanford colleagues outline a four-step “framework” for testing whether global warming has contributed to record-setting weather events. The new paper is the latest in a burgeoning field of climate science called “extreme event attribution,” which combines statistical analyses of climate observations with increasingly powerful computer models to study the influence of climate change on individual extreme weather events.

Climate change fingerprints

In order to avoid inappropriately attributing an event to climate change, the authors began with the assumption that global warming had played no role, and then used statistical analyses to test whether that assumption was valid. “Our approach is very conservative,” Diffenbaugh said. “It’s like the presumption of innocence in our legal system: The default is that the weather event was just bad luck, and a really high burden of proof is required to assign blame to global warming.”

The authors applied their framework to the hottest, wettest and driest events that have occurred in different areas of the world. They found that global warming from human emissions of greenhouse gases has increased the odds of the hottest events across more than 80 percent of the surface area of the globe for which observations were available. “Our results suggest that the world isn’t quite at the point where every record hot event has a detectable human fingerprint, but we are getting close,” Diffenbaugh said.

For the driest and wettest events, the authors found that human influence on the atmosphere has increased the odds across approximately half of the area that has reliable observations. “Precipitation is inherently noisier than temperature, so we expect the signal to be less clear,” Diffenbaugh said. “One of the clearest signals that we do see is an increase in the odds of extreme dry events in the tropics. This is also where we see the biggest increase in the odds of protracted hot events – a combination that poses real risks for vulnerable communities and ecosystems.”

The Stanford research team, which includes a number of former students and postdocs who have graduated to positions at other universities, has been developing their extreme event framework in recent years, focusing on individual events such as the 2012-2017 California drought and the catastrophic flooding in northern India in June 2013. In the new study, a major goal was to test the ability of their framework to evaluate events in multiple regions of the world, and to extend beyond extreme temperature and precipitation, which have been the emphasis of most event attribution studies.

Test cases

One high-profile test case was Arctic sea ice, which has declined by around 40 percent during the summer season over the past three decades. When the team applied their framework to the record-low Arctic sea ice cover observed in September 2012, they found overwhelming statistical evidence that global warming contributed to the severity and probability of the 2012 sea ice measurements. “The trend in the Arctic has been really steep, and our results show that it would have been extremely unlikely to achieve the record-low sea ice extent without global warming,” Diffenbaugh said.

Another strength of a multi-pronged approach, the team says, is that it can be used to study not only the weather conditions at the surface, but also the meteorological “ingredients” that contribute to rare events. “For example, we found that the atmospheric pressure pattern that occurred over Russia during the 2010 heat wave has become more likely in recent decades, and that global warming has contributed to those odds,” said co-author Daniel Horton, an assistant professor at Northwestern University in Evanston, Illinois, and a former postdoc in Diffenbaugh’s lab who has led research on the influence of atmospheric pressure patterns on surface temperature extremes. “If the odds of an individual ingredient are changing – like the pressure patterns that lead to heat waves – that puts a thumb on the scales for the extreme event.”

Diffenbaugh sees the demand for rigorous, quantitative event attribution growing in the coming years. “When you look at the historical data, there’s no question that global warming is happening and that extremes are increasing in many areas of the world,” he said. “People make a lot of decisions – short term and long term – that depend on the weather, so it makes sense that they want to know whether global warming is making record-breaking events more likely. As scientists, we want to make sure that they have accurate, objective, transparent information to work with when they make those decisions.”

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13 thoughts on “Claim: Extreme weather can be blamed on climate via statistics”

  1. So can we take these statements seriously- Diffenbaugh said. “The trend in the Arctic has been really steep, and our results show that it would have been extremely unlikely to achieve the record-low sea ice extent without global warming,” I don’t think anyone has to be a highly paid idiot to come out with statements such as that – I would have thought that first off the guy would have to build a reasonable case to show that ‘Man’ has been directly involved with the general temperature rise in that area to be able to pontificate about it – pick a headline out of the sky why don’t you

  2. With the greatest of respect anyone so arrogant as to sew up the whole question of climate in such a simplistic manner should question his own apparent arrogance in the face of Mother nature who at the end of the day is still going to be in control! (IMHO)

  3. “The trend in the Arctic has been really steep, and our results show that it would have been extremely unlikely to achieve the record-low sea ice extent without global warming,” Diffenbaugh said.

    It’s not whether or not the planet is experiencing global warming but rather if it has a human-induced component. Notice the obvious is conveniently swept aside from the conversation.

  4. “One high-profile test case was Arctic sea ice”

    This melt is caused by strong warming of waters in the arctic?
    Warming out of line with current agw models?

    So their conclusion is what exactly, that warm ocean currents melt ice.

  5. “Drought, tornadoes and other extreme weather is at an all time low.” Climate depot posted on Drudge Report.

  6. If your job is dependent upon attributing any weather event to “AGW”, that’s just what you’ll do.

  7. This is truly uninformed propaganda. These folks cant even show that fossil fuel CO2 controls atmospheric CO2 content so how can they pretend to attribute weather events to it.
    They need to look at Humlum’s work and web site and get a clue.

  8. Clever idea.

    Almost all climate change projections have failed.
    So let’s ignore the failed projections and apply “climate science” AFTER events occur.
    In that way, you can always come up with a climate change reason for why something happened.

    You take an almost 100% failure rate for predicting the future and turn it into an inevitable 100% success rate by, in effect, predicting what would happen after it already happened.

  9. ‘Almost all climate change projections have failed’.
    The modelers estimate an error range for their models, and then compare Industrial era temperature data to the model projections using known data on Ghg historical emissions; the actual temperature trends fall within the error bands of the modelers projections. By that standard, the models are a success.

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