Lake Sunapee Instrumented Buoy: High Frequency Water Quality Data - 2007-2023 (buoy version 1)

The Lake Sunapee (Global Lake Ecological Observatory Network—GLEON) instrumented buoy version 1, operated by the Lake Sunapee Protective Association (LSPA www.lakesunapee.org), was equipped with a thermistor chain, one optical dissolved oxygen probe suspended at approximately 10 meters depth (installed in 2013), and a multi-parameter sonde (installed in 2021) at 1 meter depth. An optical dissolved oxygen (DO) probe was located at 1.5 meter prior to the 2021 deployment of the multi-parameter probe from the inception of the buoy and the deep DO sensor was at 10.5 meters depth prior to 2021 since deployment. The number of thermistors and below-surface depth of the thermistors has fluctuated throughout the years and the additional water quality sensors have changed over time. The Lake Sunapee buoy is located near Loon Island Lighthouse (43.391°N, 72.058°W) during the summer months and in the Lake Sunapee Harbor (43.386°N, 72.081°W) (2010-current). During the first few years of data collection (2007-2010), the buoy was located near Loon Island year-round.

In two instances, HOBO units were deployed at the buoy's location when sensors failed. This occurred in 2015 (in place of the thermistors) and in 2018 (in place of the shallow DO sensor).

The data included in this data publication are from `version 1` of the buoy, which was decommissioned at the end of 2023. A new buoy has been purchased and is operational, but the data has changed enough to merit being stored in a new data publication; therefore, the data included in this data release `completes` the data cycle for version 1 of the LSPA buoy.

All data in this data package have been QAQC'd to remove obviously errant readings, highly suspicious readings, and artifacts of buoy maintenance. Additionally, flags have been added per sensor, to indicate calibration and non-calibration of the optical DO probe, location of the buoy, and to document other potential confounding observations.

Dissolved oxygen data and data from the multi-parameter probe are “raw”: they are have not been corrected for calibration issues, drift, or fouling. Additional documentation and data are provided including manual DO measurements, visual comparisons of buoy-recorded DO and manual DO measurements, and an overview of how and where DO offsets applied in the data logger program were removed.

萨纳皮湖（全球湖泊生态观测网络（Global Lake Ecological Observatory Network, GLEON））1号仪器浮标，由萨纳皮湖保护协会（Lake Sunapee Protective Association, LSPA，网址www.lakesunapee.org）运营，配备热敏电阻链、一台2013年安装的光学溶解氧探头（部署于约10米水深），以及2021年安装的1米水深多参数水质仪。在2021年部署多参数水质仪之前，浮标自启用起便在1.5米水深处安装了光学溶解氧（Dissolved Oxygen, DO）探头；而2021年之前部署的深层溶解氧探头布设水深为10.5米。多年来，热敏电阻的数量及其水下布设深度均有变动，新增的水质传感器也随时间迭代更新。萨纳皮湖浮标夏季部署于潜鸟岛灯塔附近（43.391°N, 72.058°W），2010年至今则部署于萨纳皮湖港（43.386°N, 72.081°W）；2007-2010年的数据采集初期，浮标全年均部署于潜鸟岛附近。

曾有两次，当传感器发生故障时，运维团队会在浮标部署位置加装HOBO设备作为临时替代：2015年替代热敏电阻，2018年替代浅层溶解氧探头。

本次数据发布涵盖的内容来自该浮标的1号版本，该版本浮标已于2023年底正式退役。目前已购置新浮标并投入运行，但新数据集与旧版差异显著，需单独归档至全新的数据发布项目中。因此，本次数据发布完整覆盖了LSPA浮标1号版本的全部数据周期。

本数据包内所有数据均已完成质量控制与质量保证（QA/QC）流程，已剔除明显异常、高度可疑的读数以及浮标维护期间产生的异常数据。此外，已为每台传感器添加标记字段，用以标识光学溶解氧探头的校准状态、浮标部署位置，并记录其他可能干扰数据质量的观测情况。

溶解氧数据及多参数水质仪采集的数据均为“原始数据”，未针对校准偏差、信号漂移或设备挂污进行校正。随数据包同步提供的补充资料与数据包括：手动溶解氧测量值、浮标记录溶解氧与手动测量值的可视化对比报告，以及关于数据记录程序中如何移除溶解氧偏移的方法与位置的概述。