Hexbyte Glen Cove Northeast Atlantic countries create new protected sea area thumbnail

Hexbyte Glen Cove Northeast Atlantic countries create new protected sea area

Hexbyte Glen Cove

Credit: CC0 Public Domain

The governments of 15 countries in the Northeast Atlantic on Friday created a new protected area of the ocean they say is bigger than the combined land mass of Germany and the United Kingdom.

The countries designated a marine protected area for seabirds covering nearly 600,000 square kilometers (about 230,000 square miles) as part of their efforts to ensure the conservation and sustainability of marine biodiversity.

The protected zone area is viewed as crucial for the feeding and breeding of local and migrating seabirds.

Government representatives also gave their blessing at a meeting in Portugal to a new North-East Atlantic Environment Strategy, which features commitments to reduce the and , , and pollution, including .

The plan includes a target to reduce trash in the sea by 50% by 2025, and by 75% by 2030.

The 15 countries belong to the so-called OSPAR Convention. They are Germany, Belgium, Denmark, Spain, Finland, France, Ireland, Iceland, Luxembourg, Norway, the Netherlands, Portugal, the United Kingdom, Sweden and Switzerland. The European Union is also a member.

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Hexbyte Glen Cove Apparent Atlantic warming cycle likely an artifact of climate forcing thumbnail

Hexbyte Glen Cove Apparent Atlantic warming cycle likely an artifact of climate forcing

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This map of the Earth shows the spacial pattern of temperature variance by percentage. The most variance is seen in the tropics with less at the poles. Credit: Daniel J. Brouillette. Penn State

Volcanic eruptions, not natural variability, were the cause of an apparent “Atlantic Multidecadal Oscillation,” a purported cycle of warming thought to have occurred on a timescale of 40 to 60 years during the pre-industrial era, according to a team of climate scientists who looked at a large array of climate modeling experiments.

The result complements the team’s previous finding that what had looked like an “AMO” occurring during the period since industrialization is instead the result of a competition between steady human-caused warming from greenhouse gases and cooling from more time-variable industrial sulphur pollution.

“It is somewhat ironic, I suppose,” said Michael E. Mann, distinguished professor of atmospheric science and director, Earth System Science Center, Penn State. “Two decades ago, we brought the AMO into the conversation, arguing that there was a long-term natural, internal climate centered in the North Atlantic based on the limited observations and simulations that were available then, and coining the term ‘AMO.’ Many other scientists ran with the concept, but now we’ve come full circle. My co-authors and I have shown that the AMO is very likely an artifact of climate change driven by human forcing in the modern era and natural forcing in pre-industrial times.”

The researchers previously showed that the apparent AMO cycle in the modern era was an artifact of industrialization-driven climate change, specifically the competition between warming over the past century from carbon pollution and an offsetting cooling factor, industrial sulphur pollution, that was strongest from the 1950s through the passage of the Clean Air Acts in the 1970s and 1980s. But they then asked, why do we still see it in pre-industrial records?

Their conclusion, reported today (Mar. 5) in Science, is that the early signal was caused by large volcanic eruptions in past centuries that caused initial cooling and a slow recovery, with an average spacing of just over half a century. The result resembles an irregular, roughly 60-year AMO-like oscillation.

“Some hurricane scientists have claimed that the increase in Atlantic hurricanes in recent decades is due to the uptick of an internal AMO cycle,” said Mann. “Our latest study appears to be the final nail in the coffin of that theory. What has in the past been attributed to an internal AMO oscillation is instead the result of external drivers, including human forcing during the industrial era and natural volcanic forcing during the pre-industrial era.”

The researchers looked at state-of-the-art climate models both for preindustrial times over the past thousand years where external factors such as solar and volcanic drivers were used, and unforced, “control” simulations where no external drivers were applied and any changes that happen are internally generated. When they looked at simulations for the short, 3- to 7-year El Niño Southern Oscillation (ENSO) cycles, they found that these cycles occurred in the models without adding forcing by climate change, volcanic activity, or anything else.

However, when they looked for the AMO, it did not occur in the unforced model and only appeared in modern times using climate change variables as forcing and in preindustrial times with forcing by .

“The models do show intrinsic internal oscillations on a 3- to 7-year time scale characteristic of the established El Niño phenomenon, but nothing on the multi-decadal scale that would be the AMO,” said Byron A. Steinman, associate professor of Earth and environmental sciences, University of Minnesota Duluth, who was also on the project. “What we know is an oscillation like El Niño is real, but the AMO is not.”

Mann suggested that while some influential scientists continue to dismiss certain trends as the result of a supposed internal AMO cycle, the best available scientific evidence does not support the existence of such a .

More information:
M.E. Mann el al., “Multidecadal climate oscillations during the past millennium driven by volcanic forcing,” Science (2021). science.sciencemag.org/cgi/doi … 1126/science.abc5810

Apparent Atlantic warming cycle likely an artifact of climate forcing (2021, March 4)
retrieved 5 March 2021
from https://phys.org/news/2021-03-apparent-atlantic-artifact-climate.html

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