Time series of dissolved methane and carbon dioxide concentrations for Falling Creek Reservoir, Beaverdam Reservoir and Carvins Cove Reservoir in southwestern Virginia, USA during 2015-2025

Surface samples and depth profiles of carbon dioxide and methane concentrations were sampled from 2015 to 2025 in three drinking water reservoirs in southwestern Virginia, USA: Beaverdam Reservoir (Vinton, Virginia), Carvins Cove Reservoir (Roanoke, Virginia), and Falling Creek Reservoir (Vinton, Virginia). All three reservoirs are owned and operated by the Western Virginia Water Authority as primary or secondary drinking water sources for Roanoke, Virginia. The dataset consists of depth profiles of dissolved greenhouse gas (carbon dioxide, methane) samples measured at the deepest site of each reservoir adjacent to the dam. Additional surface samples were collected at a gauged weir on Falling Creek Reservoir's primary inflow tributary, from a wetland adjacent to Falling Creek Reservoir, and from the reservoir outflow. At Beaverdam Reservoir, additional samples were collected at three outflow sites below the dam and at the mid-reservoir outflow. Samples were collected approximately fortnightly from March-April, weekly from May-October, and monthly in November-February at Falling Creek Reservoir and Beaverdam Reservoir. Samples were collected twice in 2025 at Carvins Cove Reservoir. Additionally, upstream surface samples were taken at multiple tributaries in Carvins Cove Reservoir. In 2019, surface samples along the stream and reservoir continuum in both Falling Creek Reservoir and Beaverdam Reservoir were collected monthly during the summer stratified period. In 2025, littoral samples were collected from Falling Creek Reservoir monthly from June to October (see site descriptions file for geographic coordinates of sampling sites). A maintenance log and quality assurance/quality control analysis scripts accompany the data package.2015年至2025年间，研究团队于美国弗吉尼亚州西南部的三座饮用水水库中采集了二氧化碳与甲烷浓度的表层样品及深度剖面样品，三座水库分别为：比弗丹水库（Beaverdam Reservoir，弗吉尼亚州文顿市）、卡文斯科夫水库（Carvins Cove Reservoir，弗吉尼亚州罗阿诺克市）以及福尔溪水库（Falling Creek Reservoir，弗吉尼亚州文顿市）。上述三座水库均由西弗吉尼亚州水务管理局（Western Virginia Water Authority）所有并运营，作为弗吉尼亚州罗阿诺克市的主要或备用饮用水水源。本数据集包含各水库大坝邻近最深测点的溶解态温室气体（二氧化碳、甲烷）深度剖面样品实测数据。额外表层样品的采集点位包括：福尔溪水库主要入流支流上的计量堰、毗邻福尔溪水库的湿地以及水库出水口。针对比弗丹水库，研究团队还在大坝下游的三处出水口以及水库中部出水口开展了额外采样。福尔溪水库与比弗丹水库的采样频率如下：3月至4月约每两周一次，5月至10月每周一次，11月至2月每月一次；卡文斯科夫水库则仅在2025年完成两次采样。此外，研究团队还在卡文斯科夫水库的多条支流采集了上游表层样品。2019年夏季水体分层期内，研究团队每月采集了福尔溪水库与比弗丹水库流域内溪流-水库连续体的表层样品。2025年6月至10月，研究团队每月从福尔溪水库采集沿岸带（littoral）样品，采样点地理坐标详见站点描述文件。本数据包附带维护日志与质量保证/质量控制分析脚本。