Rich80105
2024-12-02 02:19:39 UTC
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Permalinkhttps://scitechdaily.com/once-in-a-2000-year-event-study-explains-unprecedented-antarctic-ice-loss-equivalent-to-10x-the-size-of-the-uk/
"In 2023, the Antarctic sea ice shrank to historically low levels,
with winter ice coverage falling more than 2 million square kilometers
below normalroughly equivalent to ten times the size of the UK. This
significant decrease was particularly striking given the steady
increase in sea ice that had been observed up until 2015, making the
abrupt drop even more unexpected.
Using a large climate dataset called CMIP6, British Antarctic Survey
researchers investigated this unprecedented sea ice loss. They
analyzed data from 18 different climate models to understand the
probability of such a significant reduction in sea ice and its
connection to climate change.
Lead author Rachel Diamond explained that while 2023s extreme low sea
ice was made more likely by climate change, it was still considered
very rare according to the models.
She says: This is the first time this large set of climate models has
been used to find out how unlikely 2023s low sea ice actually was. We
only have forty-five years of satellite measurements of sea ice, which
makes it extremely difficult to evaluate changes in sea ice extent.
This is where climate models come into their own.
According to the models, the record-breaking minimum sea ice extent
would be a one-in-a-2000-year event without climate change. This tells
us that the event was very extreme anything less than one-in-100 is
considered exceptionally unlikely.
Caroline Holmes, a co-author on the study, said: Strong climate
change i.e. the temperature changes were already seeing, and those
expected if emissions continue to rise rapidly in the models makes
it four times more likely that we see such a big decline in sea ice
extent. This suggests that 2023s extreme low was made more likely by
climate change.
Long-term Consequences and Future Projections
The researchers also used the models to look at how well sea ice is
likely to recover. By looking at similar events in the models, the
authors found that after such extreme sea ice loss, not all of the sea
ice around Antarctica returns even after twenty years. This adds
model evidence to existing observational evidence that the last few
years low sea ice could signal a lasting regime shift in the Southern
Ocean."
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Rising sea temperatures will have an impact on weather in New Zealand,
sadly our current government is ignoring both the likely impact of
climate change on New Zealand directly, but also our commitments to
reduce emissions under international treaties to prepare for and try
to reduce the impact of climate change. They don't look further than
the interests of political donors . . .