St. Clair - Detroit River System: Total Phosphorus Mass B alance

This data set was developed in order to estimate the total phosphorus budget for the St. Clair Detroit River system for 1998 through 2016, to support the implementation of the 2012 Great Lakes Water Quality Agreement (GLWQA) on reducing Lake Eries phosphorus inputs. This study also identified, for the first time, that loads from resuspended Lake Huron sediment were likely not always detected in US and Canadian monitoring programs, due to mismatches in sampling and resuspension event frequencies, substantially underestimating the load. This additional load increased over time due to climate-induced decreases in Lake Huron ice cover and increases in winter storm frequencies. Given this more complete load inventory, we estimated that to reach a 40% reduction in the Detroit River TP load to Lake Erie, accounting for the missed load, point and non-point sources other than that coming from Lake Huron, and the atmosphere would have to be reduced by at least 50%. Note, this data set was created for a project led by the University of Michigan, and also affiliated with goals of 'Lake Futures: Enhancing Adaptive Capacity and Resilience of Lakes and Their Watersheds'. Lake Futures is a Pillar 3 project under the Global Water Futures Program funded by Canada First Research Excellence Fund.本数据集旨在估算1998至2016年圣克莱尔-底特律河水系（St. Clair-Detroit River System）的总磷收支，以支撑2012年《大湖区水质协定》（Great Lakes Water Quality Agreement, GLWQA）的落地实施，该协定旨在削减输入伊利湖（Lake Erie）的磷负荷。本研究首次发现，受采样频率与再悬浮事件频率不匹配的影响，美加两国的监测计划往往无法始终捕捉到休伦湖（Lake Huron）再悬浮沉积物携带的磷负荷，进而大幅低估了该部分负荷总量。随着气候驱动的休伦湖冰盖缩减与冬季风暴频次增加，该额外负荷随时间呈上升趋势。鉴于这份更完整的负荷清单，我们估算得出：若要实现向伊利湖输入的底特律河总磷（Total Phosphorus, TP）负荷削减40%的目标，在计入遗漏负荷、休伦湖以外的点源与非点源负荷以及大气来源负荷的前提下，其余各类负荷需至少削减50%。注：本数据集由密歇根大学（University of Michigan）牵头的项目所创建，同时服务于"湖泊未来：提升湖泊及其流域的适应能力与韧性"（Lake Futures: Enhancing Adaptive Capacity and Resilience of Lakes and Their Watersheds）的项目目标。"湖泊未来"是由加拿大卓越研究第一基金（Canada First Research Excellence Fund）资助的全球水未来计划（Global Water Futures Program）下的第三支柱项目。