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Intense, Long-Lasting Heatwaves Unfolding At The Bottom Of The Ocean

by Gloria Dickie
March 16, 2023, 2:47 PM
in News and Opinion
Reading Time: 2 mins read
A A
5

ocean floorHeatwaves unfolding on the bottom of the ocean can be more intense and last longer than those on the sea surface, new research suggests, but such extremes in the deep ocean are often overlooked.

A team of scientists with the U.S. National Oceanic and Atmospheric Administration has conducted the first assessment of marine heatwaves along North America’s continental shelves.

They found that these bottom heatwaves ranged from 0.5 degrees Celsius to 3C warmer than normal temperatures and could last more than six months — much longer than heatwaves at the surface.

“We simply don’t have a ton of instruments on the ocean bottom along continental shelves,” said study co-author Dillon Amaya, an NOAA climate scientist. “The ocean is a powerful thing. It destroys instruments that we have in the water for too long.”

Surface heatwaves can be picked up by satellites and can result in huge algal blooms.

But, Amaya said, often no one knows a bottom marine heatwave is happening until the impacts show up in commercial bottom-dwelling species like lobsters and crabs.

The assessment, published in the journal Nature Communications, used computer models of the ocean and observations to analyze seafloor heatwaves.

It found that while sometimes a marine heatwave can hit both the sea surface and ocean bottom at the same time, bottom heatwaves can also occur on their own.

The ocean has absorbed about 90% of the excess heat from global warming, with the ocean’s average temperature increasing by about 1.5C over the last century [According to the IPCC Sixth Assessment Report, average temperatures of the world’s oceans have increased by about 0.88°C (1.58°F) since 1901. –CCD Ed].

Marine heatwaves have become about 50% more frequent over the past decade. [Given the researchers admit marine heatwaves are often missed, this statement is highly misleading. You can’t claim a 50% increase unless you have accurate baseline data. —CCD Ed.]

“It’s a little less clear if climate change is strongly impacting bottom marine heatwaves in the same way it would at the surface,” Amaya said, saying changes to ocean circulation patterns could also play a role.

h/t John S.

Top photo by Quang Nguyen Vinh via Pexels

Read rest at Reuters

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Comments 5

  1. Ian Sloan says:
    3 years ago

    It must really annoy “scientists” that they have to go to more and more extreme regions and environments that no one else can possibly visit, in order to find new scare stories about imminent amageddon

  2. Spurwing Plover says:
    3 years ago

    And it has nothing to do with SUV,s and Backyard BBQ,s Greenpeace

  3. David Lewis says:
    3 years ago

    The language in this article is misleading, probably on purpose. “Heat wave” makes us think in term of what we experience on land, with temperatures near or above 38 C (100 F). The ocean floor is very cold, just above freezing. So a “heat wave” with an increase of 3 degrees C, would mean temperatures of 4 to 5 degrees.

  4. Graham McDonald says:
    3 years ago

    “…used computer models…”

    I wonder who wrote the program(s). The same joker that made predictions for the ‘mad cow’ outbreak in England some years ago, and who later produced the model for the Covid ‘pandemic’ spread?

  5. Joseph Repas says:
    3 years ago

    A wash of speculations that show up as what the observers want to see.
    Any speculations that heat patterns from beneath the floor of the oceans due to shifting of lava and core heat may contribute to fluctuations in low levels of the ocean warming in places? Not if you need to believe in man made climate change! The might as well ask Sponge Bob Square pants for the answer.

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