SGER- Impact of the Angora Fire on Colloidal Black Carbon in Lake Tahoe and Fallen Leaf Lake

该提案的主要目标是收集和量化太浩湖和落叶湖在太浩湖盆地安哥拉大火后的水样中的黑碳胶体(BC)。采样计划将采集落叶湖和太浩湖的近岸、湖中和出水口河流样本。除了该项目进行的采样外，我们还将利用现有的采样计划，如加州大学戴维斯分校太浩湖中段剖面(MLTP)，该剖面每30天收集一次湖泊深度剖面。12月份将向NSF水文科学提交一份提案，以解释SGER产生的数据。科学价值关于水生系统中由不完全燃烧产生的黑碳胶体知之甚少。然而，这些纳米颗粒现在被认为是全球碳循环、水文循环、全球变暖、加速积雪和冰川融化、淡水和海洋化学以及沉积物地球化学的重要组成部分。最近对海水和海洋沉积物中的BC的研究表明，BC可能在海洋和淡水水体中有很长的停留时间。这些颗粒还可能决定许多有毒有机化合物在水生生态系统中的分配。据我们所知，在湖盆发生大火后，还没有关于湖泊系统中BC胶体的研究。在安哥拉大火发生后的两年时间里，收集和分析太浩湖和落叶湖的水样中的BC。Broader影响该项目是一个难得的机会，可以研究火灾对BC胶体的影响，并确定这些胶体如何影响水环境。该项目的结果可能会对全球地球科学界以及太浩湖社区产生广泛的影响。例如，如果这项研究能够确定BC在湖泊中的停留时间，我们就能够确定BC随着时间的推移对岩石光学性质和化学成分的影响。这项研究的结果可能会应用于其他湖泊和河流。这些数据将被联邦和州的政策制定者和地方规划者用来评估和实施太浩湖地区的环境政策。该项目将通过期刊出版物和公开会议将结果传达给塔霍斯塔湖的持有者和科学界。

ABSTRACTThe primary goal of the proposal is to collect and quantify black carbon colloids(BC) in water samples from Lake Tahoe and Fallen Leaf Lake in the wake of the LakeTahoe basin Angora fire. The sampling program will collect near-shore, mid-lake andoutlet river samples from Fallen Leaf Lake and Lake Tahoe. In addition to samplingconducted by the project, we will leverage pre-existing sampling programs such as theUC-Davis Mid-Lake Tahoe Profile (MLTP), which collects depth profiles from the lakeevery 30 days. A proposal will be submitted in December to the NSF HydrologicSciences to interpret the data resulting from the SGER.Scientific meritLittle is known regarding black carbon colloids, produced by incompletecombustion, in aquatic systems. However these nano-particles are now believed to bean important component of the global carbon cycle, the hydrologic cycle, globalwarming, accelerated snow pack and glacier melt, fresh water and marine chemistry andsediment geochemistry. Recent studies of BC in seawater and marine sedimentssuggest that BC may have a very long residence time in the ocean and fresh waterbodies. These particles may also determine the partitioning of many toxic organiccompounds in aquatic ecosystems. To our knowledge there have been no studies of BCcolloids in a lake system following a major fire in its basin.Objectives. Collect and analyze BC in water samples from Lake Tahoe and Fallen Leaf Lakeover a two year period after the Angora Fire.Broader impactsThe project represents a rare opportunity to study the impact of a fire on BCcolloids and determine how these colloids impact the aquatic environment. The results ofthe project may have wide ranging impacts on the global Earth Science Community aswell as the Lake Tahoe community. For example, if the study can establish theresidence time of BC in the lake, we will be able to determine the impact of BC on thelakes optical properties and chemistry over time. The results from the study may then beapplied to other lakes and rivers. The data will be used by Federal and Statepolicymakers and local planners to evaluate and implement environmental policy in theLake Tahoe area. The project will communicate the results to the Lake Tahoestakeholders and scientific community through journal publications and public meetings.