Reconstruction of Arctic Barents-Kara sea ice extent changes over the last millennium

phys.org | 7/20/2018 | Staff
Sugar12 (Posted by) Level 4
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Under the influence of global warming, temperature in the Arctic has increased more significantly than the global average. However, winter extreme cold events in Eurasia including China, have become frequent in recent years. This trend is obviously contrary to global warming. Severe weather with cold surges, ice-snow and frozen rain occurred in southern China in 2008, and the overwhelming "boss-level" cold wave that attacked almost all of China in 2016 caused heavy casualties and property loss. Scholars believe that these events are closely related to the rapid decline of Arctic sea ice.

The Barents-Kara Sea is considered to be one of the cradles for cold waves over the Eurasian continent, and it is a key sea sector that is closely connected with cold waves over Eurasia. Studies have shown that when the Barents-Kara sea ice extent is relatively small during autumn and winter, extreme cold wave events are more likely to occur during the winter over Eurasia.

Controversies - Scholars - Occurrence - Events - Mid-latitudes

However, controversies still exist. Some scholars believe that the frequent occurrence of extreme cold events over mid-latitudes in the Northern Hemisphere in recent years are ascribed to the internal variability of atmospheric circulation, and they are not significantly related to the decrease in Arctic sea ice.

One of the main reasons for this controversy is that the length of the Arctic sea ice satellite observation data is limited regarding the analysis of changes and causes of Arctic sea ice on a long-term timescale, which severely constrains the understanding of natural variability in Arctic sea ice and its correlation with frequent extreme cold events that occur over mid-latitudes. Therefore, it is necessary to recover the Arctic sea ice time series before the instrumental period and analyze its variations on a longer timescale.

Study - Methods - High-quality - Climate - Proxy

A recent study used reliable mathematical methods combined with high-quality climate proxy data to recover the...
(Excerpt) Read more at: phys.org
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