Circulation and Respiration in Ice-covered Arctic Lakes

每年大约有9个月的时间，北极湖泊的水域处于冰下。该项目建议开展时间序列研究：1)量化对冰下热结构和环流、融雪水混合、春季和秋季混合的物理控制；2)量化不同形态和不同地质基底的北极湖泊的呼吸速率；3)说明这些物理和生物地球化学过程之间的联系和反馈。测量将包括温度和电导率、气象学、沉积物温度、冰厚、积雪以及新开发的氧气和二氧化碳分压传感器的呼吸作用。在北极的一些地区，湖泊几乎覆盖了陆地表面面积的一半。因此，预计它们将对大气底边界层和区域空气-陆地气体交换产生重大影响。该项目将开始为在区域尺度上参数化北极系统模式提供必要的过程理解。

For approximately nine months of each year, the waters of arctic lakes are under ice. The PI proposes to carry out time series studies: 1) to quantify physical controls on under ice thermal structure and circulation, mixing of snow melt waters, mixing during spring and fall, 2) to quantify respiration rates in arctic lakes of differing morphology and on different geological substrates, and 3) to illustrate the linkages and feedbacks between these physical and biogeochemical processes. Measurements will include temperature and conductivity, meteorology, sediment temperatures, ice thickness, snow cover, and respiration with newly developed oxygen and pCO2 sensors.Lakes cover nearly half the land surface area in some parts of the Arctic. As such, they are expected to have a significant impact on the atmospheric bottom boundary layer and air-land gas exchange regionally. This project will begin to provide the process understanding necessary to parameterize Arctic system models on regional scales.