"Biogeochemistry of lakes in winter, and the implications of declining ice cover"

“冬季湖泊的生物地球化学以及冰盖减少的影响”

• 批准号: 418506-2012
• 负责人: Baulch, Helen
• 金额: $ 1.89万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=631909
• 关键词: Biogeochemistry; lakes; winter; implications; declining

Lakes across much of Canada are ice-covered for long periods every year. Ice cover creates conditions fundamentally different from other seasons, with low light penetration, low temperatures, and the presence of a barrier to gas exchange. Throughout much of the North Temperate Zone we have observed rapid declines in periods of ice cover. Climate change predictions suggest further reductions in ice cover can be expected. However, logistical challenges associated with winter field work mean that we have relatively poor understanding of current conditions in lakes during winter. As a result, prediction of future changes is fraught with uncertainty.The major objective of this proposal is to understand how declining periods of ice cover will affect lake ecology and biogeochemistry. We will use a high frequency autonomous sensor network to measure changes in temperature, light and oxygen concentrations through winter months. We will also perform detailed process-based measurements to understand biogeochemical changes across different lake types. Finally, we will use this new understanding to build models of winter biogeochemistry. This will allow us to predict the ecological and biogeochemical effects of reduced ice cover, and contribute to an improved understanding of how climate change will affect lakes.

加拿大大部分地区的湖泊每年都有很长一段时间被冰覆盖。冰盖造成了与其他季节截然不同的条件，光线穿透度低，温度低，并且存在气体交换障碍。在北温带的大部分地区，我们观察到冰层覆盖期的迅速减少。气候变化预测表明，预计冰盖将进一步减少。然而，与冬季野外工作相关的后勤挑战意味着我们对冬季湖泊的现状了解相对较差。因此，对未来变化的预测充满了不确定性。本提案的主要目的是了解冰盖减少期将如何影响湖泊生态和生物地球化学。我们将使用高频自主传感器网络来测量整个冬季的温度、光线和氧气浓度的变化。我们还将进行详细的基于过程的测量，以了解不同湖泊类型的生物地球化学变化。最后，我们将利用这一新认识建立冬季生物地球化学模型。这将使我们能够预测冰盖减少对生态和生物地球化学的影响，并有助于更好地了解气候变化将如何影响湖泊。