High-frequency water quality data for Gwynns Falls, Baisman Run, and Pond Branch, Baltimore County and Baltimore City, MD, USA

This resource includes water quality sensor data measured at three stations along the main stem of the Gwynns Falls watershed, spanning an urban to rural gradient of development from Baltimore City to Baltimore County, MD, USA. In addition, two forested reference sites, Baisman Run and Pond Branch at Oregon Ridge, and one urban site, Dead Run (tributary to Gwynns Falls), are instrumented in Baltimore County, MD, USA. Sensor data are collected at a 5-minute frequency by YSI EXO2 sondes that include temperature, specific conductance, turbidity, dissolved oxygen, and pH. In addition, s::can spectrolyser v3 sondes measure nitrate-nitrogen, total organic carbon, and dissolved organic carbon at a 15-minute frequency at 5 of the sites. A Seabird SUNA is currently measuring nitrate-nitrogen at Dead Run at a 30-minute frequency. All Dead Run data are provided in a separate linked resource. High frequency data are collected for the purpose of evaluating event-based water quality /discharge behavior, as a complement to weekly grab-sample stream chemistry data that have been collected by the Baltimore Ecosystem Study since 1998. The six sites are co-located with USGS stream gages. Data are telemetered to UMBC. Infrequent synoptic grab sampling is also carried out and this data set is also included this resource. This resource is part of the Baltimore Social-Environmental Collaborative Urban Integrated Field Laboratory supported by Department of Energy as well as the Critical Zone Collaborative Network supported by NSF.

本数据集包含沿美国马里兰州巴尔的摩市至巴尔的摩县的格温斯福尔斯（Gwynns Falls）流域干流布设的3个监测站点的水质传感器数据，监测覆盖了从市区到县域的城乡开发梯度。此外，在美国马里兰州巴尔的摩县境内，还布设了2个森林参照站点——俄勒冈岭的贝斯曼溪（Baisman Run）与庞德溪（Pond Branch），以及1个城市站点死溪（Dead Run，格温斯福尔斯的支流）。YSI EXO2型探头以5分钟的采样频率采集传感器数据，测量参数涵盖温度、比电导率、浊度、溶解氧及pH值。此外，5个监测站点配备了s::can spectrolyser v3型探头，以15分钟的采样频率测量硝态氮、总有机碳及溶解性有机碳。目前，死溪站点还部署了Seabird SUNA型探头，以30分钟的采样频率测量硝态氮。所有死溪站点的监测数据均在单独的关联资源中提供。本数据集采集高频数据的目的是评估基于水文事件的水质与径流行为，作为巴尔的摩生态研究（Baltimore Ecosystem Study）项目自1998年起采集的每周人工河流水化学取样数据的补充。上述6个监测站点均与美国地质调查局（USGS）的河道水位监测站同址布设。数据通过远程传输至马里兰大学巴尔的摩县分校（UMBC）。本数据集同时纳入了不定期的同步瞬时取水样监测数据。本数据集隶属于美国能源部（Department of Energy）资助的巴尔的摩社会-生态协同城市综合野外实验室项目，同时也是美国国家科学基金会（National Science Foundation，简称NSF）资助的关键带协同网络项目的组成部分。