Biogeochemical Response of the Lower Great Lakes to NutrientLoading and Climate: Past, Present, and Future Trends in Tropic State Variables

这项为期三年的研究将阐明 降低五大湖的营养富集和减少，并提供 监测其他国家营养状态变量变化的基础 大型深水湖泊 收集的数据将校准现有的 现代条件的替代指标，并开发新技术 用于估计过去、现在和未来的营养变化， 五大湖的州。 现场项目将包括数据 从水柱、沉积物收集器和 安大略湖和伊利湖。 实验室实验将确定 营养盐富集对碳氮同位素的影响 浮游植物产生的有机物的特征。

This 3-year study will elucidate the historical response of the lower Great Lakes to nutrient enrichment and abatement, and provide a basis for monitoring changes in trophic state variables in other large, deep-water lakes. Data collected will calibrate existing proxy indicators to modern conditions and develop new techniques for estimating past, present and future changes in the trophic state of the Great Lakes. The field program will include data collection from the water column, sediment traps and cores from Lake Ontario and Erie. Laboratory experiments will determine the effects of nutrient enrichment on the carbon and nitrogen isotopic signature of organic matter produced by phytoplankton.