Earlier ice loss accelerates lake warming in the Northern Hemisphere.
Earlier ice loss accelerates lake warming in the Northern Hemisphere.
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DOI：
10.1038/s41467-022-32830-y
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发表时间：
2022-09-02
影响因子：
16.6
通讯作者：
中科院分区：
文献类型：
--
作者：
大地理区域的湖泊温度如何响应冰物候的广泛变化（即季节性冰形成和损失的时间）仍不清楚。在这里，我们分析了卫星数据和全球尺度的模拟，以研究湖冰季节性的长期变化对整个北半球地表水温度趋势的贡献。我们的分析表明，在封冰的几个月里，湖面普遍过度变暖，平均是开放水域季节计算的1.4倍。从1979年到2020年，这种过度变暖主要受到冰破裂平均时间提前8天的影响。在未来湖冰永久消失之前，由于预估的未来湖冰物候变化，过度的湖泊变暖可能会进一步放大。过度的湖泊变暖可能会改变湖内的物理和生物地球化学过程，对湖泊生态系统产生许多影响。湖泊温度如何对湖冰的广泛变化作出反应尚不清楚。在这里，作者展示了由于北半球早期的冰损失和较晚的冰形成，在冰封月和冰封月期间过度的湖泊变暖。
How lake temperatures across large geographic regions are responding to widespread alterations in ice phenology (i.e., the timing of seasonal ice formation and loss) remains unclear. Here, we analyse satellite data and global-scale simulations to investigate the contribution of long-term variations in the seasonality of lake ice to surface water temperature trends across the Northern Hemisphere. Our analysis suggests a widespread excess lake surface warming during the months of ice-off which is, on average, 1.4 times that calculated during the open-water season. This excess warming is influenced predominantly by an 8-day advancement in the average timing of ice break-up from 1979 to 2020. Until the permanent loss of lake ice in the future, excess lake warming may be further amplified due to projected future alterations in lake ice phenology. Excess lake warming will likely alter within-lake physical and biogeochemical processes with numerous implications for lake ecosystems. How lake temperatures are responding to widespread changes in lake ice remains unclear. Here the authors show the excess lake warming during the ice-off and ice-on month due to earlier ice loss and later ice formation across the Northern Hemisphere.
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影响因子：
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通讯作者：
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