Dissolved Oxygen and Temperature Data from the Hyporheic Zone of the East River Watershed July 2017 to October 2018

Dissolved oxygen (DO) is critical for aquatic ecosystems. Our focus is on the long-term DO dynamics in hyporheic zone of rivers, which are a function of both transport (hydrologic exchange between river and hyporheic zone) and uptake by biogeochemical reactions or respiration. The study site is the alpine East River watershed in Colorado, USA, meander A downstream from the pump house. Opti O2 probes were deployed in the water column and directly within the river-bed at 10, 20, and 35 cm depth (38°55'23.38"N, 106°57'4.21"W, 9046.88m) to monitor DO and temperature. A continuous data stream from July 24, 2017 to Oct 24, 2018 was autonomously telemetered to the cloud. This 14-month DO and temperature time series were obtained without any servicing for maintenance or data downloads; additionally the ability to remotely verify probe performance during field deployment was essential to confirm data validity during winter freeze-in and hydrological/weather events, such as spring melt and summer monsoons. We investigate the variations in dissolved oxygen dynamics of this snow-pack dominated watershed during a comparatively low flow water year (2018) and a relatively normal water year (2017), enabled by distinctive, in-situ, high frequency (∆t = 5min) sensors that provided a continuous time-series from the undisturbed study site over multiple seasons.

溶解氧（Dissolved Oxygen, DO）对水生生态系统至关重要。本研究聚焦河流潜流带（hyporheic zone）的长期溶解氧动态变化，其过程由两大因素共同调控：河流与潜流带间的水文交换过程，以及生物地球化学反应或呼吸作用对溶解氧的摄取过程。研究点位设于美国科罗拉多州阿尔卑斯型东河流域泵站下游的A弯道处。研究团队在水柱中以及河床内10 cm、20 cm、35 cm深度处布设了Opti O2传感器（Opti O2 probes），用于监测溶解氧与温度，点位坐标为38°55'23.38"N, 106°57'4.21"W，海拔9046.88米。2017年7月24日至2018年10月24日的连续监测数据通过自主遥传技术上传至云端，该14个月的溶解氧与温度时间序列无需人工开展维护保养或数据下载操作即可获取。此外，野外布设期间可远程验证传感器运行状态，这对确认冬季封冻、春季融雪及夏季季风等水文/气象事件期间的数据有效性至关重要。本研究依托可在多季连续监测未受干扰研究点位的特色原位高频传感器（采样间隔Δt=5分钟），分析了积雪补给主导流域在2017年（正常来水水文年）与2018年（枯水水文年）的溶解氧动态变化特征。