"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: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=573694
• 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会长时间覆盖。 冰盖产生的条件与其他季节根本不同，光线较低，温度低以及存在气体交换的障碍。 在整个北部温带地区，我们都观察到冰盖时期的迅速下降。 气候变化的预测表明，可以预期进一步减少冰覆盖。 但是，与冬季工作有关的后勤挑战意味着我们对冬季湖泊当前状况的了解相对较差。 结果，对未来变化的预测充满了不确定性。 该提案的主要目的是了解冰覆盖时期下降将如何影响湖泊生态学和生物地球化学。 在冬季，我们将使用高频自主传感器网络来测量温度，光和氧气浓度的变化。 我们还将执行基于过程的详细测量，以了解不同湖类型的生物地球化学变化。 最后，我们将使用这种新的理解来建立冬季生物地球化学的模型。 这将使我们能够预测冰覆盖减少的生态和生物地球化学作用，并有助于改善对气候变化如何影响湖泊的理解。