The work was guided by World Weather Attribution, which involves research organizations worldwide, including Climate Central. The group's work follows established scientific approaches and the findings are published before they are put through peer review.
The group aims to help the public quickly understand links between climate change and individual instances of extreme weather. Its rapid attribution analyses have previously focused on droughts, heat waves and coral bleaching.
Scientists involved with the Louisiana study said the region's complex weather made their task more difficult than usual. It required the use of modeling experiments involving some of the world's most powerful climate models.
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"This was absolutely the most challenging analysis we've done so far," said Heidi Cullen, Climate Central's chief scientist, and one of the authors of the new paper. Still, Cullen said she considered the findings "really robust."
National Center for Atmospheric Research senior scientist Kevin Trenberth, who was not involved with the study, said the findings provided a "partial commentary" on the storm. He said the work missed key details related to the roles of El Niño in the heavy rains.
"Extreme events always result from an intersection of natural variability of some sort riding on top of and enhancing global warming effects," Trenberth said. "This aspect was not addressed in this study."
The complexity of the new study "had a big impact on how certain we were" that "we would be able to do a sensible analysis," said Geert Jan van Oldenborgh, a Royal Netherlands Meteorological Institute climate scientist who was involved with this and prior rapid attribution studies.
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"However, in the end, we are as sure as in the other studies that there is an increase due to climate change," Van Oldenborgh said.
Princeton's Van der Wiel said she hopes the research will help Louisianans better plan for modern flood risks - after they've pieced their lives back together.
"We are climate scientists," Van der Wiel said. "We wanted to help. This is what we can do."
More From Climate Central:
The Fuel Behind Louisiana's Torrential Rains, Floods
Landfalling Typhoons Have Become More Intense
The Human Fingerprints on Coastal Floods
This article originally appeared on Climate Central, all rights reserved.
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