Extreme low temperature records
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Global Patterns and Records of Extreme Low Temperatures
Extreme low temperature records are a significant aspect of climate variability, with impacts ranging from societal disruptions to ecological stress. The coldest place on Earth is Antarctica, where land surface temperatures have reached a record low of -110.9 °C, highlighting the severity of cold extremes in polar regions. Other biomes, such as tundra, also experience extremely low average minimum temperatures, with zonal averages as low as -66.6 ± 14.8 °C, demonstrating the global diversity of cold extremes .
Trends in Extreme Low Temperature Events
Despite global warming, extreme low temperature (ELT) events continue to occur. Analyses of global observational data from 1970 to 2019 show a significant decrease in the frequency of low temperature extremes at 41.1% of stations worldwide, but the magnitude of low temperature records is still increasing at nearly half of the stations, indicating that while such events are less frequent, they can still be intense when they occur . In the United States, the ratio of record high to record low temperatures has increased to about 2:1 in the early 21st century, reflecting a trend toward fewer record cold events, but not their complete disappearance .
Regional Case Studies of Record-Shattering Cold Events
Europe and France
In France, persistent cold events have been studied using rare-event algorithms. While the frequency of extreme cold spells has decreased over time, their intensity remains stationary. Simulations show that present-day conditions can still produce winters as cold as the record-shattering event of 1963, despite overall warming trends .
China
China has experienced several record-breaking low temperature events in recent decades. In 2021, 20 ELT events were recorded, with some regions experiencing much lower temperatures than climatological averages. The spatial impact varied, with the most significant effects in Northwest, North, and Northeast China. The mechanisms behind these events often involve intensified high-pressure systems and enhanced polar jet streams, which facilitate the southward movement of cold air masses 59. In high-elevation areas like the northeastern Tibetan Plateau, Arctic air masses and polar vortex activity are key drivers of extreme cold events .
South Africa
Even in regions with robust warming trends, such as southern Africa, ELT events still occur. In July 2021, South Africa experienced a significant cold event that broke at least 27 long-term low temperature records. This event was driven by a combination of atmospheric circulation anomalies, including a cut-off low, a cold front, and a ridging anticyclone, which together intensified cold air advection from the Southern Ocean .
The Balkans
The Balkan Peninsula experienced an exceptionally cold episode in January 2017, with some locations facing minimum temperatures expected only once every 15 to 300 years. This event was linked to an outbreak of Arctic air masses and a cutoff low in the upper atmosphere, underscoring the role of synoptic-scale circulation in producing extreme cold .
Atmospheric Circulation and Mechanisms
Extreme low temperature records are often associated with specific atmospheric circulation patterns. In China, the phase of the Arctic Oscillation (AO) influences the regional occurrence of record-breaking cold events, with negative AO phases favoring northern China and positive phases favoring southern China. Intensified high-pressure systems and enhanced jet streams are common features that facilitate the movement and accumulation of cold air masses, leading to record low temperatures 510.
Conclusion
Extreme low temperature records continue to be set in various regions, even as global warming trends reduce their frequency. The intensity of these events can remain high, and their occurrence is closely tied to atmospheric circulation patterns, such as polar vortex activity, high-pressure systems, and jet stream dynamics. Understanding these mechanisms is crucial for forecasting and preparing for future cold extremes, which, while less frequent, can still have significant impacts worldwide 1234+5 MORE.
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