What is it about?
Poleward Transportation of mid-latitude warm-wet air is important for the equatorward outbreak of polar cold air and extreme cold surges. We find that the simultaneous blocking high pressures can bring much more warm moisture into the Arctic. The synergistic effect of blockings can accelerate the rapid phase transition of Arctic Oscillation and amplify the strength of cold air preceding to the cold surge outbreaks.
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Why is it important?
A persistent strong cold surge occurred in East Asia in late January 2018, causing mean near-surface air temperature in China to hit the second lowest since 1984. Some extended range signals of the cold extreme is found: a) the double blocking synergy is responsible for the rapid and drastic change in the Arctic circulation; b) more double blockings extended into the Arctic in recent winters, which is conducive to extreme cold events.
Perspectives
I hope this article help people think that the occurrence of an extreme event is not only by chance, but also by necessity. If we can adequately know the necessity and the principles, we can deal with disasters better.
Dr Liang Zhao
LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences
Read the Original
This page is a summary of: A Synergistic Effect of Blockings on a Persistent Strong Cold Surge in East Asia in January 2018, Atmosphere, February 2020, MDPI AG,
DOI: 10.3390/atmos11020215.
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