More tropical cyclones in ancient past could play role in Earth's warmer future

Washington, Feb 25 (ANI): A team of climate scientists has determined that more frequent tropical cyclones in Earth's ancient past have contributed to persistent El Nino-like conditions, which could have implications for the planet's future as global temperatures continue to rise due to climate change.

The team used both cyclone and climate models to study the frequency and distribution of tropical cyclones during the Pliocene epoch, a period three to five million years ago when temperatures were up to four degrees Celsius warmer than today.

The team found that there were twice as many tropical cyclones during this period, that they lasted two to three days longer on average than they do now, and that, unlike today, they occurred across the entire tropical Pacific Ocean.

"The Pliocene is the best analog we have in the past for what could happen in our future," said Christopher Brierley, a Yale postdoctoral associate and an author of the study.

"We wondered whether all these storms could have contributed to the warmer climate," he added.

In fact, the team discovered a positive feedback cycle between tropical cyclones and upper-ocean circulation in the Pacific that explains the increase in storms and appears to have led to permanent El Nino-like conditions.

Today, cold water originating off the coasts of California and Chile skirts around the region of tropical cyclone activity on its way to the Equator, where it results in a "cold tongue" that stretches west off the coast of South America.

During the Pliocene, however, the team found that this cold water could not avoid being hit by one of the many tropical cyclones, which would churn up and mix warmer water into it.

This warming at the Equator led to changes in the atmosphere that in turn created more tropical storms-and the cycle would repeat.

"The team hopes to study how much mixing could result from tropical cyclones in today's ocean waters-something that is hard to incorporate in global climate models," said Alexey Fedorov, an associate professor at Yale and lead author of the research paper.

The existing consensus is that, while the number of intense hurricanes will increase, the overall number will actually decrease.

"However, unless we understand the causes of these differences, we will not be sure whether our projections are correct," Fedorov said.

"Changes in the frequency and distribution of these storms could be a significant component of future climate conditions," he added. (ANI)