Phosphorus, nitrogen, chloride, and suspended-sediment load estimates for the Great Lakes Restoration Initiative tributary monitoring network: Water years 2011–2023

Phosphorus, nitrogen, chloride, and suspended-sediment loads, in 24 U.S. tributaries of the Great Lakes, were estimated using U.S. Geological Survey (USGS) data from the Great Lakes Restoration Initiative (GLRI) monitoring program for the period Oct 2010 through Sept 2023 (USGS water years 2011-23). Specific water-quality constituents include total phosphorus, orthophosphate, particulate phosphorus, total nitrogen, nitrate plus nitrite, ammonium plus ammonia, chloride, and suspended sediment. Concentrations and loads, including actual and flow-normalized estimates, were estimated with Weighted Regression on Time, Discharge, and Season (WRTDS). Results are reported at daily and annual time steps in this data release and via an interactive web application (https://rconnect.usgs.gov/glritrends). This data release is an update of a previous version for water years 2011-20. Major changes include the addition of data from water years 2021-23 and the addition of chloride to the constituents.

本数据集针对美国五大湖24条支流的磷、氮、氯化物及悬浮泥沙负荷展开估算，所用数据来自美国地质调查局（U.S. Geological Survey, USGS）的五大湖修复倡议（Great Lakes Restoration Initiative, GLRI）监测项目，时间跨度为2010年10月至2023年9月（对应USGS的2011-2023水文年）。具体监测的水质组分包括总磷、正磷酸盐、颗粒态磷、总氮、硝酸盐+亚硝酸盐、铵盐+氨、氯化物以及悬浮泥沙。浓度与负荷（含实测值及流量归一化估算值）采用时间、流量与季节加权回归（Weighted Regression on Time, Discharge, and Season, WRTDS）模型进行估算。本次数据发布以日度和年度时间步长输出结果，并可通过交互式Web应用（https://rconnect.usgs.gov/glritrends）查看。本数据发布是针对2011-2020水文年旧版本的更新，主要更新内容包括新增2021-2023水文年的监测数据，以及新增氯化物这一监测组分。