Global warming: Eastern U.S. to see more heatwaves, rain

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University of Tennessee researchers say the eastern U.S. can expect more heatwaves and increased precipitation in a warming world. Image courtesy NASA.

New climate model pinpoints predictions down to the city level

By Summit Voice

SUMMIT COUNTY — As climate models become more sophisticated, researchers have started to fine-tune global warming impacts to the regional level, including more drought and water shortages expected in the Southwest, seasonal ice-free conditions in the Arctic, and hotter, wetter conditions in the Eastern U.S., according to a new University of Tennessee study.

The researchers, Joshua Fu, a civil and environmental engineering professor, and Yang Gao, a graduate research assistant, say heat waves will become more severe in most regions of the eastern United States and, that both the Northeast and Southeast will see a drastic increase in precipitation.

Scaling down the latest global climate models with the help of some super-computing power, the pair of scientists said they developed precise scales of cities which act as a climate crystal ball seeing high resolution climate changes almost 50 years into the future.

“Instead of studying regions, which is not useful when examining extreme weather, dynamical downscaling allows us to study small areas such as cities with a fine resolution,” said Fu, who is also a professor within the UT-ORNL Bredesen Center for Interdisciplinary Research and Graduate Education.

The researchers evaluated extreme events along with daily maximum and minimum temperatures and daily precipitation. For the 23 states east of the Mississippi River, they analyzed the present-day climate from 2001 to 2004 and predicted the future climate from 2057 to 2059.

This is the first study to predict heat waves for the top 20 cities in the eastern U.S. For example, Nashville will see a temperature rise of 3.21 degrees Celsius and Memphis will see a rise of 2.18 degrees Celsius.

In comparing present climate to future, the researchers found that heat waves will become more severe throughout the eastern part of the nation. The Northeast and eastern Midwest will experience a greater increase in heat waves than the Southeast, which will almost equalize the temperatures between the future North and current South.

“Currently, the mean heat wave duration is about four days in the Northeast and eastern Midwest and five days in the Southeast,” said Fu. “By the end of the 2050s, the Northeast and eastern Midwest will be gaining on the Southeast by increasing two days.”

In addition, the Northeast and eastern Midwest are likely to suffer from steeper increases in the severity of heat waves.

“While the Southeast has the highest intensity in heat waves, the northeast is likely to experience the highest increase,” said Fu. “We are looking at temperature increases of 3 to 5 degrees Celsius, with New York experiencing the highest hike.”

Both the Northeast and Southeast will experience an increase of precipitation of 35 percent or more. Most coastal states will see the greatest increase, of about 150 millimeters a year. Taking into consideration heat waves and extreme precipitation, the Northeast shows the largest increases in precipitation. This suggests a greater risk of flooding.

“It is important that the nation take actions to mitigate the impact of climate change in the next several decades,” said Fu. “These changes not only cost money—about a billion a year in the U.S.—but they also cost lives.”

Fu and Gao collaborated with researchers at Emory University and the National Center for Atmospheric Research. They received assistance from the National Center for Computational Sciences, the UT-ORNL Joint Institute for Computational Sciences and UT’s National Institute for Computational Sciences.

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