Sweating to Shivering: Study Finds Rapid Swings in Temperature Have Increased

A September heat wave switching into a snowstorm over one day in the Rocky Mountains. Winter snowfall suddenly melting and saturating fields of dormant crops, before refreezing and encasing them in damaging ice. Early spring warmth prompting plants to blossom followed by a cold snap that freezes and drops their petals.

Rapid temperature change events like these have increased in frequency and intensity over recent decades, a new study found.

The transition periods for these abrupt temperature shifts have also shortened, according to the study, published Tuesday in the journal Nature Communications.

Because the quick changes in temperature give communities and ecosystems little chance to respond, they may pose greater challenges than heat waves or cold snaps alone, said Wei Zhang, an assistant professor of climate science at Utah State University and one of the lead authors of the study.

“The impact could really be cascading on a different level,” he said.

The researchers warned these temperature flips could have damaging effects on people and natural environments, including destruction of crops, harm to ecosystems and strains on power infrastructure. And low-income countries, where there is less access to weather forecasting and infrastructure is less resilient, are more vulnerable.

The researchers examined temperature data from 1961 to 2003 to identify global patterns in sudden weather shifts, where temperatures in an area either jumped from cold temperatures to warm or plunged from warm to cold within five days. They found that instances of these flips increased in more than 60 percent of regions they surveyed.