New climate pattern similar to El Niño emerges and threatens southern hemisphere, researchers say
The new weather pattern could cause changes in the climate throughout the Southern Hemisphere. Scientists define the discovery as the identification of a new "switch" in Earth's climate system.
New climate pattern similar to El Niño begins near New Zealand - Photo Reproduction/Getty Images
Researchers claim to have discovered a new climate phenomenon that has characteristics similar to El Niño, but with different nuances that could cause changes in the climate of the entire southern hemisphere. Tentatively named "Southern Hemisphere Circumpolar Pattern Wave Number 4," or "SST-W4," this emerging weather pattern originates near New Zealand and Australia. Scientists liken the discovery to "finding a new 'switch' in Earth's climate."
What is "SST-W4"?
El Niño, or El Niño Southern Oscillation (ENSO), is a periodic and unpredictable change in winds and currents in the tropical Pacific that significantly impacts global climate. This climate phenomenon occurs, on average, every five years and is associated with floods, droughts and other global disturbances. Now, it appears that ENSO has a new equivalent: the New El Niño. According to research published in the Journal of Geophysical Research: Oceans, SST-W4 emerges further south than traditional El Niño, in the subtropical southwest Pacific, near Australia and New Zealand.
Although the area controlling these climate changes is relatively small, it could cause temperature changes throughout the Southern Hemisphere, according to the researchers. According to Balaji Senapati, a researcher at the Department of Meteorology at the University of Reading in England and lead author of the study, "this discovery is like finding a new switch in Earth's climate." Senapati adds that this demonstrates that a relatively small area of ocean can have far-reaching effects on global climate and weather patterns.
Study
Scientists had already identified a pattern a few years ago that influenced fluctuations in sea surface temperatures in the region, but they did not fully understand how it worked. In the new study, they were able to successfully simulate this pattern for the first time. To do this, they used an advanced climate model that represented 300 years of climate conditions. This model integrates atmospheric, oceanic, and sea ice components, offering a comprehensive view of Earth's climate system. By analyzing the simulated data, researchers discovered a recurring pattern in sea surface temperature variations around the Southern Hemisphere.
Expected Impacts
Scientists detailed in a statement that the climate pattern acts like a global chain reaction, generating four alternating areas of heat and cold in the oceans, forming a complete cycle in the southern hemisphere. The research reveals that this pattern originates offshore from New Zealand and Australia, in a small region that acts as a control point for SSTT-W4. Changes in ocean temperature in this specific area influence atmospheric temperatures, creating a wave pattern that moves across the Southern Hemisphere, driven by strong westerly winds, as the researchers explain.
As wind patterns change, ocean temperatures are also altered, creating areas of alternating warm and cold air. Westerly winds can then carry warmed or cooled air around the planet, forming an anomalous weather pattern that intensifies or dampens temperature swings. Researchers noted that this new phenomenon has some similarities with other known climate systems in the tropics, such as the warming El Niño or the opposite cooling phase, La Niña. However, SST-W4 occurs independently of these phenomena, suggesting that this pattern has always been part of Earth's climate system but has only now been identified.
What to expect from the discovery
In the study, scientists did not explore how the changes caused by this new El Niño could evolve. However, it is possible that this phenomenon helps explain why the Southern Hemisphere is experiencing drought, warming, and an increase in storm intensity. The researchers emphasize that, to obtain definitive conclusions, a deeper understanding of the connection between climate variability in the Southern Hemisphere and the subtropical Southwest Pacific is necessary. Either way, the discovery of this new climate pattern highlights the importance of the interaction between the ocean and the atmosphere for our climate.
Balaji Senapati, from the University of Reading, highlights that understanding this new climate system can significantly improve weather and climate forecasts, especially in the southern hemisphere. This could shed light on climate change that is still a mystery and improve our ability to predict meteorological phenomena and extreme weather events.
