Image Source: The New York Times
El niño southern oscillation winter weather research is entering a critical new phase as scientists study a potentially historic El Niño developing across the equatorial Pacific. The event could offer researchers an important opportunity to understand how ocean warming, atmospheric patterns and climate change are influencing global weather.
In an update issued Sept. 10, the National Oceanic and Atmospheric Administration said there was a 75% chance the developing El Niño could become “a historic event” stronger than previous events recorded since 1950. Sea surface temperatures in the equatorial Pacific are already warmer than ever recorded for this time of year.
Historic El Niño Mission Sends Saildrones Into the Pacific
To gather more information, NOAA recently launched four autonomous Saildrone Explorers from off Honolulu. The uncrewed vessels are traveling toward the region where the El Niño pattern is strengthening. Their mission was briefly interrupted when Hurricane Lowell approached the Hawaiian Islands, forcing operators to steer the drones away from danger.
Once they reach the target area, the vessels are expected to spend five months collecting data. The wind-propelled and solar-powered machines can be repositioned as conditions change, allowing scientists to monitor areas that are difficult or dangerous for crewed research ships.
Each 23-foot Saildrone Explorer carries 15 meteorological and oceanographic sensors. The instruments measure:
- Sea and air temperatures
- Salinity and ocean currents
- Carbon dioxide levels
- Wind speed and direction
- Other air-sea conditions linked to changing weather patterns
Meghan Cronin, a research oceanographer with NOAA’s Pacific Marine Environmental Laboratory, said the observations should provide scientists with much more information about the El Niño region than conventional monitoring methods alone.
Powerful Clues Could Reveal How El Niño Begins
Scientists have improved their ability to identify El Niño and La Niña events since the early 1980s, but important questions remain. Researchers now want to understand the smaller, short-term disturbances that can trigger a much larger shift in the Pacific atmosphere and ocean.
Michael McPhaden, a University of Washington researcher who has studied El Niño for nearly five decades, compared the process to starting a bonfire. Ocean heat acts like dry wood, while a temporary weather disturbance provides the spark.
This year, McPhaden said, twin cyclones on opposite sides of the equator in the western Pacific may have helped ignite the event. Strong eastward winds from the storms could have contributed to the shift. Other possible influences include Kelvin waves, which carry heat through the upper ocean, and the Madden-Julian Oscillation, a recurring pattern of tropical weather activity.
The Saildrones are designed to capture these fast-changing processes as they happen. That information could help researchers identify why some disturbances grow into major El Niño events while others fade away.
Why El Niño Matters for Winter Weather and Climate
El Niño affects far more than the tropical Pacific. Changes in the ocean and atmosphere can influence storm tracks, rainfall, drought, flooding, fisheries, agriculture, energy demand and seasonal weather patterns across the world.
That makes the el niño southern oscillation winter weather connection especially important. Although the current mission is focused on ocean observations rather than issuing a specific winter forecast, improved data could eventually help forecasters better anticipate seasonal risks.
Emily Becker, a research associate at the University of Miami’s Rosenstiel School, said the event provides an opportunity to learn what El Niño looks like in a warmer climate. Scientists are particularly interested in whether climate change is altering the strength, timing or effects of natural El Niño and La Niña variability.
Ben Kirtman, dean of the Rosenstiel School, said researchers still need answers about how El Niño interacts with the broader climate crisis. Jhordanne Jones, an assistant professor at Penn State, described the climate system as hearing a different and more irregular “melody” as global temperatures rise.
The modern observing network is far more advanced than it was in 1982, when an unexpectedly powerful El Niño caught scientists off guard. Satellites, ocean platforms and autonomous vehicles now provide continuous measurements. The new Saildrone mission adds a flexible layer of observation precisely where scientists need more detail.
Frequently Asked Questions
What is El Niño?
El Niño is a recurring climate pattern involving unusually warm ocean temperatures in the central and eastern tropical Pacific. It can disrupt atmospheric circulation and influence weather around the world.
How could El Niño affect winter weather?
El Niño can shift storm tracks and alter temperature and precipitation patterns. Its effects vary by region, and local winter conditions also depend on other climate factors.
What are Saildrones?
Saildrones are uncrewed, wind-propelled and solar-powered surface vehicles equipped with sensors that collect oceanographic and atmospheric data.
What do scientists hope to learn?
Researchers hope to discover how short-term storms, ocean heat, Kelvin waves and other atmospheric disturbances combine to start or strengthen an El Niño event.
Why is this research important?
Better observations could improve forecasts for extreme storms, flooding, drought, agriculture, energy demand, fisheries and seasonal weather risks.
