近日，济南大明湖冬泳赛吸引了众多游泳爱好者参与。不少来自南方沿海城市的选手表示，尽管是冬季，但大明湖的水温竟比他们家乡海边的水温还要高，令人意外。据气象与水文数据显示，受内陆湖泊保温效应及地下水补给影响，大明湖冬季水温通常维持在4℃至6℃之间；而南方部分海域因寒潮南下、海水流动性强等因素，水温反而可能降至3℃以下。此外，淡水比热容较大，在低温环境下降温速度慢于海水，也使得内陆湖泊在严寒季节仍保有相对“温和”的水温。参赛者们笑称：“本以为来北方挑战极限，结果发现水没想象中冷！”这一现象不仅体现了中国南北气候与水体特性的差异，也让冬泳这项融合勇气与健康的运动更添趣味。赛事组织方也借此机会普及冬泳安全知识，提醒参与者科学评估自身体能与水温适应能力，确保安全完赛。
Recently, the Daming Lake Winter Swimming Competition in Jinan drew numerous swimming enthusiasts. Surprisingly, many participants from southern coastal cities noted that despite being in winter, the water temperature of Daming Lake was actually warmer than that of the sea back home. According to meteorological and hydrological data, due to the lake’s inland location, thermal retention effect, and groundwater inflow, Daming Lake’s winter water temperature typically stays between 4°C and 6°C. In contrast, some southern coastal waters can drop below 3°C during cold surges, as seawater is more exposed to wind and has higher thermal conductivity. Additionally, freshwater has a higher specific heat capacity than seawater, meaning it cools more slowly in cold conditions—helping inland lakes retain relatively milder temperatures during harsh winters. Participants joked, “We came north expecting an extreme challenge, only to find the water wasn’t as cold as we thought!” This phenomenon highlights the climatic and hydrological differences between northern and southern China, adding an unexpected twist to the physically demanding yet health-promoting sport of winter swimming. Organizers also took the opportunity to promote safety awareness, urging swimmers to assess their physical condition and acclimatization to cold water scientifically to ensure a safe experience.
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