Study reconstructs ancient storms to help predict changes in tropical cyclone hotspot

Study reconstructs ancient storms to help predict changes in tropical cyclone hotspot
WHOI researchers reconstructed 3,000 years of storm history on Jaluit Atoll in the southern Marshall Islands. This region is the birthplace of tropical cyclones in the western North Pacific--the world's most active tropical cyclone zone. Credit: Natalie Renier, ©Woods Hole Oceanographic Institution

Intense tropical cyclones are expected to become more frequent as climate change increases temperatures in the Pacific Ocean. But not every area will experience storms of the same magnitude. New research from the Woods Hole Oceanographic Institution (WHOI) published in Nature Geoscience reveals that tropical cyclones were actually more frequent in the southern Marshall Islands during the Little Ice Age, when temperatures in the Northern Hemisphere were cooler than they are today.

This means that changes in atmospheric circulation, driven by differential ocean warming, heavily influence the location and intensity of .

In the first study of its kind so close to the equator, lead author James Bramante reconstructed 3,000 years of storm history on Jaluit Atoll in the southern Marshall Islands. This region is the birthplace of tropical cyclones in the western North Pacific—the world's most active tropical cyclone zone. Using differences in sediment size as evidence of extreme weather events, Bramante found that tropical cyclones occurred in the region roughly once a century, but increased to a maximum of four per century from 1350 to 1700 CE, a period known as the Little Ice Age.

Bramante, a recent graduate of the MIT-WHOI Joint Program in Oceanography/Applied Ocean Science and Engineering, says this finding sheds light on how climate change affects where cyclones are able to form.

"Atmospheric circulation changes due to modern, human-induced climate warming are opposite of the circulation changes due to the Little Ice Age," notes Bramante. "So we can expect to see the opposite effect in the deep tropics—a decrease in tropical cyclones close to the equator. It could be good news for the southern Marshall Islands, but other areas would be threatened as the average location of cyclone generation shifts north," he adds.

Study reconstructs ancient storms to help predict changes in tropical cyclone hotspot
WHOI geologist Andrew Ashton (left) and MIT-WHOI Joint Program graduate and lead author James Bramante collect sediment samples on a reef flat near Jaluit Atoll's northwest blue hole. Credit: James Bramante, ©Woods Hole Oceanographic Institution

During major storm events, coarse sediment is stirred up and deposited by currents and waves into "blue holes", ancient caves that collapsed and turned into sinkholes that filled with sea water over thousands of years. In a 2015 , Bramante and his colleagues took samples from a blue hole on Jaluit Atoll and found coarse sediment among the finer grains of sand. After sorting the grains by size and analyzing the data from Typhoon Ophelia, which devastated the atoll in 1958, the researchers had a template with which to identify other storm events that appear in the sediment record. They then used radiocarbon dating—a method of determining age by the ratio of carbon isotopes in a sample—to date the sediment in each layer.

Armed with previously-collected data about the ancient climate from tree rings, coral cores, and fossilized marine organisms, the researchers were able to piece together the conditions that existed at the time. By connecting this information with the record of storms preserved in sediment from Jaluit Atoll, the researchers demonstrated through computer modeling that the particular set of conditions responsible for equatorial trade winds heavily influenced the number, intensity and location where cyclones would form.

Jeff Donnelly, a WHOI senior scientist and a co-author of the study, used similar methods to reconstruct the history of hurricanes in the North Atlantic and Caribbean. He plans to expand the Marshall Islands study westward to the Philippines to study where tropical cyclones have historically formed and how climate conditions influence a storm's track and intensity. Better understanding of how storms behaved under previous conditions will help scientists understand what causes changes in tropical activity and aid people living in coastal communities prepare for extreme weather in the future, he said.

"Through the geologic archive, we can get a baseline that tells us how at-risk we really are at any one location," Donnelly says. "It turns out the past provides some useful analogies for the climate change that we're currently undergoing. The earth has already run this experiment. Now we're trying to go back and determine the drivers of tropical cyclones."


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More information: Increased typhoon activity in the Pacific deep tropics driven by Little Ice Age circulation changes, Nature Geoscience (2020). DOI: 10.1038/s41561-020-00656-2 , www.nature.com/articles/s41561-020-00656-2
Journal information: Nature Geoscience

Citation: Study reconstructs ancient storms to help predict changes in tropical cyclone hotspot (2020, November 16) retrieved 23 November 2020 from https://phys.org/news/2020-11-reconstructs-ancient-storms-tropical-cyclone.html
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