It is widely accepted that the average surface temperature of the Earth has been gradually increasing globally since the start of the Industrial Revolution in the 19th century (Folland
et al.,
2001). However, significant spatial and temporal variations in magnitude have also been confirmed at different latitudes and during different seasons. For example, the most dramatic warming has been found in the middle-to-high latitudes of the northern hemisphere. Winter has been shown to be the fastest-warming season in terms of the global average, followed by spring (Easterling
et al.,
2000; Kim
et al.,
2013; Screen
et al.,
2012). The Arctic is warming up at near-record speed, twice as fast as the global average, due to climate change, a phenomenon known as “Arctic amplification” (Serreze and Barry,
2011). As a result of climate warming, a new pattern of more frequent and more intense weather events has unfolded around the world (Miller
et al.,
2019; Tong
et al.,
2019; Zhang
et al.,
2019; An
et al.,
2020; Hu and Sun,
2020; Jiao
et al.,
2020). Some researchers speculate that northeastern China is one of the regions that are most likely to experience considerable changes in climate in the context of the continuous and perilous trend in global warming. Extreme warming events are expected to be more frequent, while extreme cooling events will tend to disappear (Libanda,
2020; Liu and Xu,
2020). The reality, however, is that cold winters at middle-to-high latitudes in the northern hemisphere have frequently been observed since the beginning of the 21st century (Qiao
et al.,
2014). In the recent decade, although affected by global warming, Heilongjiang has more cold winters. For instance, there was a 5-year succession of cold winters from 2009-2013 (Li
et al.,
2010; Song
et al.,
2011). In 2017-2018, cold waves frequently hit the province, with many record low temperatures observed according to the data of meteorological stations (Ban
et al.,
2019). Studies have suggested that rapid warming in the Arctic will also affect the rest of the world, which is called a “spillover effect” (Qin
et al.,
2017). The changes occurring in the Arctic, the heat sink of the northern hemisphere, are of equal importance to variations in atmospheric circulation and climate. To some extent, the effects of changes in the Arctic on climate even exceed those on atmospheric circulation (Zhang
et al.,
2008). Li
et al. (
2014) discovered that the difference in temperature between the Arctic and the Equator in winter is highly connected to winter temperatures in East Asia. An abnormal decrease in temperature as a result of temperature advection is one reason for the extremely low winter temperatures at the middle latitudes of East Asia. The above-mentioned studies indicate that frequent cold winters at middle-to-high latitudes in the northern hemisphere are necessarily related to the abrupt and accelerating Arctic warming. During the three days from December 29, 2020 to January 1, 2021, a cold wave swept across China. Experts at the China Meteorological Administration pointed out that the strong cold wave was also a result of the warming in the Arctic, which leads to variations in both the Polar Vortex and the Siberian High, and also to changes in winter temperatures in China (Li
et al.,
2021). It is another example of the direct relationship between the rapid warming of the Arctic and cold winters in China. However, so far, there have been few studies of the effects of Arctic warming and the mechanism by which it affects climate and weather patterns in other regions of the world.