Phosphorus concentrations and flow data, Old Woman Creek, Ohio, 2015-2023

The Old Woman Creek National Estuarine Research Reserve is located in Huron, Ohio (USA), along the southern shore of Lake Erie. Old Woman Creek is a fourth order stream that flows through a 0.6 km² wetland complex during its last 2 stream km, and surface connectivity between the stream and lake is mediated by a barrier sand beach that can open and close depending on flow, wind, waves, and precipitation. The Reserve has been measuring water quality in Old Woman Creek since 1980. Data presented in this package represent a small part of this long-term monitoring used in the study by Anderson et al. (2024, http://dx.doi.org/10.2139/ssrn.4947733) titled "We know less about phosphorus retention in constructed wetlands than we think we do: A quantitative literature synthesis". This study aims to identify gaps in our collective understanding of structural wetland features, monitoring methods, and long-term trajectories in restored and constructed wetlands. It uses the Old Woman Creek data presented in this data package to test different sampling frequencies to determine how sampling approach affects observed trends in total phosphorus loading. The data in this package include total phosphorus concentrations collected at the Inlet and Outlet of Old Woman Creek between 2015 and 2023. Total phosphorus concentrations were collected between 1 and 3 times per day at the Inlet and once per day to once per week at the Outlet, depending on streamflow. Additionally, flow data measured at 15-minute intervals at the stream Outlet between 2020 and 2023 are also included. This Outlet flow data corresponds well with flow measurements made by the United States Geological Survey (USGS) at the stream Inlet. While the Inlet flow data is not included in this package, it was used in the study by Anderson et al. (2024) and can be obtained from USGS's website by searching for gauge number 04199155. Additional data from the Old Woman Creek National Estuarine Research Reserve long-term water quality monitoring program is available by contacting the Reserve's Research Coordinator.老妇人溪国家河口研究保护区（Old Woman Creek National Estuarine Research Reserve）坐落于美国俄亥俄州休伦市，毗邻伊利湖南岸。老妇人溪为四阶溪流（fourth order stream），在其最后2公里河段流经一片面积0.6平方千米的湿地综合体（wetland complex）；溪流与湖泊的地表连通性由一道屏障沙坝（barrier sand beach）调控，该沙坝可随流量、风力、浪况及降水条件开合。该保护区自1980年起便开展老妇人溪的水质监测工作。本数据包收录的数据，是Anderson等人2024年发表于《我们对人工湿地磷截留的认知远低于预期：一项定量文献综合研究》（http://dx.doi.org/10.2139/ssrn.4947733）的研究中所使用的长期监测数据的一部分。该项研究旨在厘清当前学界对恢复湿地与人工湿地的结构特征、监测方法及长期动态的认知空白，利用本数据包收录的老妇人溪数据测试不同采样频率（sampling frequency），以探究采样方案对总磷负荷（total phosphorus loading）观测趋势的影响。本数据包涵盖2015年至2023年期间，老妇人溪溪口（Inlet）与出水口（Outlet）处采集的总磷（total phosphorus）浓度数据：溪口处的总磷浓度采样频率为每日1至3次，出水口处则根据径流量（streamflow）调整为每日1次至每周1次。此外，数据包还包含2020年至2023年期间以15分钟为间隔采集的出水口流量数据，该数据与美国地质调查局（United States Geological Survey, USGS）在溪口处测得的流量数据吻合度较高。尽管本数据包未收录溪口流量数据，但Anderson等人2024年的研究已使用该数据，用户可通过美国地质调查局官网搜索测站编号04199155获取。若需获取老妇人溪国家河口研究保护区长期水质监测项目的更多数据，可联系该保护区的研究协调员。