Editör:
Halit Emre İbrahimoğlu
24
September 2020 - 12:06
Reacting
to news of the Arctic summer sea ice minimum reaching its second lowest extent
in the 42-year satellite record on September 15, and to recent reports of a
polar heatwave, Greenland ice sheet’s loss of million tonnes of ice per day,
the collapse of the Spalte glacier and Milne Ice Shelf, and the Arctic’s shift
to a new climate, the Clean Arctic Alliance today called on world leaders to
take urgent action to slow Arctic warming.
“With
temperatures reaching 38° Celsius north of the
Arctic Circle in June, and Arctic sea ice melting faster than most climate
models predicted, the Clean Arctic Alliance is calling on world leaders to take
urgent action to curb warming of the Arctic region, by accelerating national
and regional policies and practices that will fulfill the goals of the Paris
Agreement, especially that of limiting the increase to 1.5o Celsius – requiring
a 50% reduction in emissions by 2030”, said Dr Sian Prior, Lead Advisor to the Clean
Arctic Alliance.
“The
extreme summer of 2020 is demonstrating, with global mean temperatures already
showing an increase of 1.1° Celsius, that unless urgent and collective action
is taken, a 2° Celsius increase will prove detrimental to human health and
wellbeing, our economies and the environment”
The Clean Arctic Alliance, which comprises 20
international non-profit organisations, is campaigning for a robust and effective ban
on the use and carriage of heavy fuel oil by shipping in the Arctic, while
advocating for shipping to decrease its climate impact, particularly through
reductions in black carbon emissions.
This
summer Arctic sea ice reached its lowest extent ever throughout July with
substantial openings of the sea ice north of Alaska and within the Beaufort and
Chukchi Seas, while the Northern Sea Route along Russia’s Arctic coastline
opened in July for the first time ever. The melting slowed somewhat during
early August, but picked up again in September to reach the annual sea ice
minimum in mid-September, and it is the second lowest summer sea ice extent
since the records began, over 40 years ago. Scientists are now predicting
summers with no sea ice by 2035 .
Arctic
sea ice is important to minimising risks of reaching global warming tipping
points and thresholds not just in the Arctic, but in the global climate system.
Arctic summer sea ice is expected to be lost at around 1.7° Celsius global
warming; by 1.5° Celsius – which is expected to be reached between 2030 and
2052 – there is likely to already be several days or weeks without ice and by
2° Celsius the Arctic would be ice free for several months every year.
While
this might be hailed as a boon for shipping in the Arctic, it is not good news
for the global climate system, as it drives further warming through feedback
loops. Ice loss from the Arctic ice cap drives the freshening of the oceans
(decreased salinity due to fresh water from glaciers) and global sea level
rise, while the melting Arctic permafrost releases climate warming gases
including methane, that drive further climate changes.
In
addition, recent research suggests that loss of Arctic sea ice will lead to
“projected Increases in extreme Arctic ocean surface waves” [5]. Loss of Arctic
sea ice will have impacts outside the Arctic – affecting mid-latitude weather
patterns. The Intergovernmental Panel for Climate Change’s (IPCC) Special
Report on the Ocean and Cryosphere in a Changing Climate (SROCC) observed that
this has already happened with 1° Celsius of warming.
“The
Earth has already undergone nearly 1° Celsius of warming since the late 1800s,
and the Arctic is warming much faster – between 2 to 3° Celsius over the same
period. Temperatures over the Barents Sea and around the Svalbard archipelago
have increased by 1.5° Celsius per decade over the past 40 years. When the
global temperature has increased by 1.7°Celsius, we will be on track for an
ice-free Arctic for several months of the year”, continued Prior.
“The
loss of Arctic sea ice is not only catastrophic for Arctic communities, the
ecosystems they depend upon and ice-dependent wildlife, it has enormous
ramifications for the entire planet. It will potentially upset weather patterns
further south, drive the loss of snow and glaciers from mid-latitude mountain
regions and also have an impact on fisheries.
Source
: SN-TR.
Tidak ada komentar:
Posting Komentar