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Scientists uncover link between ocean weather and global climate, using mechanical rather than statistical analysis

December 20, 2023
in Science
Scientists uncover link between ocean weather and global climate, using mechanical rather than statistical analysis
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Scientists uncover link between the ocean's weather and global climate

This illustration by Benjamin Storer shows oceanic weather systems (mesoscale eddies) from data overlaid with atmospherically driven climate-scale currents (black lines), which can be extracted with a coarse graining technique developed in the lab of Hussein Aluie. The image reveals how these ocean weather systems are energized (red) or weakened (blue) when interacting with climate-scales, which follows a pattern mirroring the global atmospheric circulation. Credit: University of Rochester / Benjamin Storer

An international team of scientists has found the first direct evidence linking seemingly random weather systems in the ocean with climate on a global scale. Led by Hussein Aluie, an associate professor in the University of Rochester’s Department of Mechanical Engineering and staff scientist at the University’s Laboratory for Laser Energetics, the team reported their findings in Science Advances.

The ocean has weather patterns like what we experience on land, but on different time and length scales, says lead author Benjamin Storer, a research associate in Aluie’s Turbulence and Complex Flow Group. A weather pattern on land might last a few days and be about 500 kilometers wide, while oceanic weather patterns such as swirling eddies last three to four weeks but are about one-fifth the size.

“Scientists have long speculated that these ubiquitous and seemingly random motions in the ocean communicate with climate scales, but it has always been vague because it wasn’t clear how to disentangle this complex system to measure their interactions,” says Aluie. “We developed a framework that can do exactly that. What we found was not what people were expecting because it requires the mediation of the atmosphere.”

The group’s goal was to understand how energy passes through different channels in the ocean throughout the planet. They used a mathematical method developed by Aluie in 2019, which was subsequently implemented into an advanced code by Storer and Aluie, that allowed them to study energy transfer across different patterns ranging from the circumference of the globe down to 10 kilometers. These techniques were then applied to ocean datasets from an advanced climate model and from satellite observations.

The study revealed that ocean weather systems are both energized and weakened when interacting with climate scales, and in a pattern that mirrors the global atmospheric circulation. The researchers also found that an atmospheric band near the equator called the “intertropical convergence zone,” which produces 30% of global precipitation, causes an intense amount of energy transfer, and produces ocean turbulence.

Storer and Aluie say that studying such complex fluid motion happening at multiple scales is not easy, but that it has advantages over previous attempts to link weather to climate change. They believe the team’s work creates a promising framework for better understanding the climate system.

“There’s a lot of interest in how global warming and our changing climate is influencing extreme weather events,” says Aluie. “Usually, such research efforts are based on statistical analysis that requires expansive data to have confidence in the uncertainties. We are taking a different approach based on mechanistic analysis, which alleviates some of these requirements and allows us to understand cause and effect more easily.”

The team that played a central role in the investigation also included Michele Buzzicotti, a research scientist at the University of Rome Tor Vergata; Hemant Khatri, a research associate at the University of Liverpool, and Stephen Griffies, a senior scientist at Princeton.

More information:
Benjamin Storer et al, Global Cascade of Kinetic Energy in the Ocean and the Atmospheric Imprint, Science Advances (2023). DOI: 10.1126/sciadv.adi7420. www.science.org/doi/10.1126/sciadv.adi7420

Citation:
Scientists uncover link between ocean weather and global climate, using mechanical rather than statistical analysis (2023, December 20)
retrieved 20 December 2023
from https://phys.org/news/2023-12-scientists-uncover-link-ocean-weather.html

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