冰盖湖泊的不同氧气趋势是由冰盖的减少和生态记忆驱动的
Joachim Jansen1,2,3, Gesa A Weyhenmeyer4, Laura H Härkönen5
1Institute for Atmospheric and Earth System Research, University of Helsinki, Helsinki FI-00014, Finland.
概括
气候变暖正在改变冰盖湖泊中的溶氧 (DO). 小湖面临恶化的缺氧,而大湖则由于不同的冰盖变化而显示出改善的氧气水平.
科学领域:
- 临界技术 临界技术
- 气候变化科学 气候变化科学
- 生态生态学 生态生态学
背景情况:
- 溶解氧 (DO) 对于冰盖湖泊中的水生生物至关重要.
- 季节性冰盖通常会导致氧气耗尽.
- 气候变暖对冬季氧化的影响尚未完全理解.
研究的目的:
- 为了研究北半球湖泊中冰下溶解氧的趋势.
- 确定湖泊大小如何影响DO对气候变化的反应.
- 为了确定驱动不同湖泊形态学的观察到的DO趋势的因素.
主要方法:
- 从19,645个湖泊 (1960-2022) 分析了660万个物理和化学观测结果.
- 对溶解氧趋势的系统分析.
- 层次建模以评估形态测量和季节性影响.
主要成果:
- 冰下DO趋势与湖泊大小有很大差异.
- 小湖 (<10公) 显示了负DO趋势 (-0.14毫克L-1十年-1).
- 大型湖泊 (≥104公) 呈现出积极的DO趋势 (0.11毫克L−1十年−1).
- 在大型湖泊中,冰盖的持续时间缩短得更快.
- 夏季氧气耗尽在小型湖泊中转移到冬季.
- 大型湖泊受益于漫长的秋季通风和较短的冬季冰盖.
结论:
- 气候变暖加剧了季节性冰覆盖的小湖泊的脱氧.
- 大型湖泊可能会经历改善的冰下氧化.
- 湖泊形态测量是预测DO应对气候变化的关键因素.
- 持续的变暖对较小湖泊的水生生态系统构成重大威胁.
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