In recent years, many regions have experienced unusually warm weather during the traditional ‘Sanjiu’ period—the coldest stretch of winter—leading to the popular phrase ‘Sanjiu as warm as spring.’ This phenomenon has drawn public attention to climate change. Normally occurring between the 19th and 27th days after the winter solstice, Sanjiu is historically the chilliest time of the year, yet temperatures in numerous areas have recently soared well above seasonal averages, sometimes resembling spring conditions.Meteorologists attribute this anomaly primarily to global warming and disruptions in atmospheric circulation. On one hand, rising greenhouse gas emissions continue to elevate Earth’s average temperatures. On the other, instability in the polar vortex and fluctuations in the jet stream can block cold Arctic air from moving southward, allowing warmer air masses to dominate.While a mild Sanjiu may feel pleasant temporarily, it can disrupt natural cycles—such as causing premature plant budding or increasing overwintering survival rates of pests—thereby affecting agriculture and ecosystems. Rapid temperature swings also pose health risks, particularly for cardiovascular conditions.Addressing this trend requires enhanced climate monitoring and early-warning systems, alongside global efforts to reduce emissions and mitigate climate change. The public should also heighten awareness of climate adaptation, enjoying warm winters cautiously while remaining alert to their hidden risks.
近年来，多地在传统“三九”寒天期间出现异常温暖的天气，被形象地称为“三九暖如春”。这一现象引发公众对气候变化的关注。‘三九’通常是一年中最冷的时段，出现在冬至后的第19至27天，但近年来不少地区在此期间气温明显高于常年同期，部分地区甚至达到春季水平。气象专家指出，这种反常暖冬主要受全球变暖和大气环流异常的共同影响。一方面，温室气体排放导致地球平均气温持续上升；另一方面，极地涡旋不稳定、西风带波动等因素使冷空气南下受阻，暖空气占据主导，造成阶段性高温。“三九暖如春”虽带来短暂舒适，但也可能扰乱自然节律，如植物提前萌发、病虫害越冬存活率提高等，进而影响农业生产和生态系统。此外，气温剧烈波动还可能增加心脑血管疾病风险。应对这一趋势，需加强气候监测与预警，同时推动节能减排，减缓全球变暖进程。公众也应增强气候适应意识，在享受暖冬的同时，警惕其潜在风险。
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