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New model can predict marine heat waves, extreme ocean acidity months in advance - StuffsEarth
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Alienx
November 25, 2024
Forecast skill for MHW, OAX (Ω a ), and OAX ([H+ ]). Credit: Nature Geoscience (2024). DOI: 10.1038/s41561-024-01593-0
In the 21st century, the Earth’s oceans are growing warmer and more acidic. This change is happening slowly over the long-term, but it can also cause short-term, local spikes.
These events are like the heat waves and or bad air quality days we experience here on land, they just happen underwater. And, if they are bad enough, they can devastate marine ecosystems.
INSTAAR Ph.D. student Samuel Mogen, INSTAAR director Nicole Lovenduski and collaborators take aim at these ocean extremes in a new paper published in Nature Geoscience . The researchers outline a method for forecasting both marine heat waves and acute ocean acidity. The new model is adept at forecasting these events up to a year in advance, with varying degrees of certainty based on the location.
Though Mogen and his collaborators are not the first to develop a predictive model for marine heat waves, they are the first to forecast ocean acidification. In the past, this research has been stymied by a lack of data—acidity is much harder to measure than temperature. While satellites can accurately measure sea surface temperature from above, acidity levels can only be measured by collecting physical water samples.
However, in recent years, scientists have been hard at work entering measurements from research cruises into large earth system models like the one Mogen used. Much of this research has been contributed by Mogen’s collaborators at the National Center for Atmospheric Research in Boulder.
“We’re getting to the point where we can use them to try and understand the evolution of carbon in the ocean in the short-term future,” Mogen said.
Carbon is key for understanding ocean acidity, especially in the 21st century. As global emissions increase, more and more carbon dioxide leaches into seawater from the atmosphere, making it more acidic. Mogen’s model predicts, for the first time, how large-scale climate patterns might impact this effect.
In one example, the researchers found that the recurring warming event in the central and eastern tropical Pacific Ocean called an El Niño seems to lead to widespread ocean acidity. This effect is especially pronounced in the eastern pacific, off the coast of the Americas.
Mogen and his collaborators used a mineral called aragonite as a proxy for ocean acidification. As acidity goes up, aragonite concentrations go down. And, this change has a direct effect on marine organisms. Mollusks, like clams and snails, and corals rely on aragonite to form shells and exoskeletons. Without it, they are left unprotected.
“It can impact how you grow a shell, how quickly your shell dissolves and just your overall survival,” Mogen explained.
This is just one of the myriad ways that ocean acidity affects marine life. Many are still being discovered.
As acute ocean acidification events worsen, Mogen hopes that his research will pave the way to better forecasting and more sustainable management of marine ecosystems.
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“If you can predict these events in advance, you might be able to inform a manager of a regional fishery and they can alter their practices,” Mogen explained. “Maybe you change how you’re harvesting fish to allow the ecosystem to make it through an extreme event.”
Mogen’s paper is fresh off the (virtual) presses, but the researchers actually put the finishing touches on their model a year ago. Back in November of 2023, they produced a forecast for the upcoming year that foretold widespread marine heat waves and ocean acidity.
Mogen says that, at first glance, the heat wave predictions seem to have played out. But, it will take a while longer to crunch incoming data on acidity. As new information flows in, the researchers will dive back in and further validate the model. In the end, they hope to give decision makers the best possible tools to predict ocean extremes and mitigate their impacts.
More information:
Samuel C. Mogen et al, Multi-month forecasts of marine heatwaves and ocean acidification extremes, Nature Geoscience (2024). DOI: 10.1038/s41561-024-01593-0
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