‘Sanjiu’ (the third ‘nine-day’ period after the Winter Solstice, typically days 19–27) is traditionally considered the coldest time of the year in Chinese seasonal customs. However, in recent years, many regions have experienced unusually high temperatures during this period, prompting public confusion: why is ‘Sanjiu’ so hot?This phenomenon is closely linked to global climate change. Rising greenhouse gas emissions have led to a steady increase in global average temperatures and more frequent extreme weather events. Even during what should be the peak of winter, strong warm air masses can push southward or local high-pressure systems can dominate, causing temperatures to soar well above seasonal norms. Additionally, the urban heat island effect exacerbates warming in cities—dense infrastructure, traffic, and human activity release substantial heat, making urban winter temperatures significantly higher than in surrounding rural areas.Meteorologists emphasize that warmer ‘Sanjiu’ periods are not random anomalies but concrete manifestations of long-term climate warming. While occasional cold snaps may still occur, the overall trend shows milder winters and fewer extreme cold events—a new normal shaped by climate change. Thus, the paradox of a ‘hot Sanjiu’ serves as a stark reminder of climate change’s far-reaching impacts and underscores the urgency for proactive mitigation measures.It’s important to note that short-term weather fluctuations do not negate long-term climate trends. Understanding the ‘hot Sanjiu’ phenomenon scientifically can enhance public awareness and drive action against the climate crisis.
‘三九’通常指冬至后的第19天到第27天，是中国传统节气中一年中最冷的时段。然而近年来，不少地区在‘三九’期间却出现了异常高温，引发公众疑惑：为何‘三九’反而这么热？这一现象主要与全球气候变化密切相关。随着温室气体排放增加，全球平均气温持续上升，极端天气事件频发。即使在传统意义上的寒冬时节，暖空气也可能强势南下或本地受高压系统控制，导致气温明显高于常年同期。此外，城市热岛效应也在加剧局部地区的升温——密集的建筑、交通和人类活动释放大量热量，使城市冬季温度显著高于周边乡村。气象专家指出，‘三九’变暖并非偶然，而是气候变暖趋势下的具体体现。虽然个别年份仍可能出现严寒，但长期来看，冬季整体变暖、极端冷事件减少已成为新常态。因此，‘三九不冷反热’提醒我们关注气候变化带来的深远影响，并采取积极措施应对。需要注意的是，短期天气波动不能否定长期气候趋势，科学看待‘三九热’现象，有助于提升公众对气候危机的认知与行动力。
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