Nicole Welle | August 10, 2020
University of Iowa researchers may have found a new influence on how tropical storms develop in the Atlantic Ocean.
Researchers identified a connection between a climate system in East Asia and the frequency of tropical storm development in the Atlantic ocean. The study discusses the Rosby wave, an atmospheric phenomenon carried west to east by the East Asian Subtropical Jet Stream (EASJ). The EASJ is an upper-level river of wind, and Rosby waves ride it to the North Atlantic when tropical cyclones are most likely to form. The waves are known to affect wind shear, a key element to tropical storm formation, according to an ENN article.
The researchers analyzed various datasets and observed almost 40 years of Atlantic tropical cyclones during prime formation season. They then connected that information to EASJ activity during that same time period and discovered that a stronger EASJ is associated with fewer Atlantic tropical cyclones, according to Iowa Now.
“When the EASJ is stronger, it can enhance this pattern, which leads to stronger teleconnections and stronger wind shear in the North Atlantic,” said Wei Zhang, a climate scientist at IIHR-Hydroscience and Engineering at UI. “That can suppress Atlantic tropical cyclone formation.”
Researchers hope this new information can become a useful tool for predicting tropical cyclone formation in the Atlantic Ocean in the future.