Eight Mile Lake Research Watershed, Carbon in Permafrost Experimental Heating Research (CiPEHR): Dissolved Organic Carbon 2007-2017

The Carbon in Permafrost Experimental Heating Research (CiPEHR) project addresses the following questions: 1) Does ecosystem warming cause a net release of C from the ecosystem to the atmosphere?, 2) Does the decomposition of old C, that comprises the bulk of the soil C pool, influence ecosystem C loss?, and 3) How do winter and summer warming alone, and in combination, affect ecosystem C exchange? We are answering these questions using a combination of field and laboratory experiments to measure ecosystem carbon balance and radiocarbon isotope ratios at a warming experiment located in an upland tundra field site near Healy, Alaska in the foothills of the Alaska Range. How have dissolved organic carbon concentrations and radiocarbon ages changed over interannual and seasonal time? How do DOC concentrations correlate with environmental variables, such as precipitation, thaw depth, water table depth, and soil temperatures? This dataset contains dissolved organic carbon (DOC) concentrations and radiocarbon values from streams draining a permafrost research site at Eight Mile Lake, AK. Several sampling years include multiple annual sampling dates, while other years include only one sampling date. Not every location was sampled every year, and not every parameter was measured every year. The dataset will continue into 2017 but whether it will be maintained after that year is unknown.

永久冻土实验加热研究（Carbon in Permafrost Experimental Heating Research, CiPEHR）项目旨在解答以下三类科学问题：1）生态系统升温是否会引发碳从生态系统向大气的净释放？2）占土壤碳库主体的老碳分解过程，是否会对生态系统碳流失产生影响？3）单独开展与联合实施的冬季、夏季升温，分别会如何作用于生态系统碳交换？为解答上述问题，研究团队结合野外实地实验与实验室分析，在位于阿拉斯加山脉山麓、阿拉斯加希利镇附近的高地苔原采样场地的升温实验装置中，测定了生态系统碳平衡与放射性碳同位素比值。研究同时关注以下科学问题：溶解有机碳浓度与放射性碳年龄在年际与季节尺度上发生了怎样的动态变化？溶解有机碳浓度与降水、解冻深度、地下水位深度及土壤温度等环境变量之间存在何种关联？本数据集涵盖了取自阿拉斯加州八英里湖永久冻土研究场地周边溪流的溶解有机碳（dissolved organic carbon, DOC）浓度数据与放射性碳数值。部分采样年度包含多次年度采样节点，其余年度仅开展单次采样。并非所有采样点位每年均会被监测，也并非所有参数每年均会被测定。该数据集的采集工作将延续至2017年，至于2017年之后是否会持续维护更新，目前尚未明确。