Share this article:
Despite the long-term global warming trend, parts of the eastern United States are getting cooler, according to new research from Dartmouth College.
The research team, led by Jonathan M. Winter, an assistant professor of geography at Dartmouth, found a "warming hole" that moved around the eastern U.S. as the seasons changed over the past 60 years.
The study determined that the warming hole tended to be located over the southeastern U.S. during the winter/spring seasons as the Polar Vortex sends arctic air into the region from time to time.
The warming hole tended to shift northward into the midwestern U.S. by the summer.
A wavier jet stream pattern may be responsible for the warming hole in the winter. Rapid warming and melting sea ice in the Arctic region may play a role in wavier jet stream patterns during the winter, according to recent studies.
The Dartmouth research team found that the jet stream over the U.S. started to become wavier in the late 1950s, according to the Dartmouth report.
During the summer months, the team concluded that the warming hole in the Midwest may actually be caused by intensified farming, increased irrigation and air pollution (increased aerosols reflect more of the sun's energy back to space).
The researchers utilized NOAA data from 1,407 temperature and 1,722 precipitation stations across the contiguous U.S. going back to 1901 to help reach their conclusion.
Daily temperatures in the warming hole cooled by an average of 1.2 degrees Fahrenheit since 1958, while the globe as a whole warmed about 1 degree during the same period.
This study was recently published in the Geophysical Research Letters.
Comments that don't add to the conversation may be automatically or manually removed by Facebook or AccuWeather. Profanity, personal attacks, and spam will not be tolerated.
Climate change may make beer more of a luxury item in the future.
The goal of limiting future warming to 1.5 degree Celsius above pre-industrial levels.
Rapid warming in the Arctic may be linked to an increase in persistent weather patterns across North America.
What were the primary causes of the slowdown in global warming from 1998 to 2012?
Governments may need to act by 2035.
Mounting evidence that humans are influencing the giant airstreams that circle the globe high above the surface and steer weather systems.