Filtered chlorophyll a time series for Beaverdam Reservoir, Carvins Cove Reservoir, Claytor Lake, Falling Creek Reservoir, Gatewood Reservoir, Smith Mountain Lake, Spring Hollow Reservoir in southwestern Virginia, and Lake Sunapee in Sunapee, New Hampshire, USA during 2014-2024

Water column chlorophyll a was analyzed from 2014 to 2024 in seven freshwater reservoirs in southwestern Virginia (VA), USA, and one freshwater lake in central New Hampshire (NH), USA. These waterbodies are: Beaverdam Reservoir (Vinton, VA), Carvins Cove Reservoir (Roanoke, VA), Claytor Lake (Pulaski, VA), Falling Creek Reservoir (Vinton, VA), Gatewood Reservoir (Pulaski, VA), Smith Mountain Lake (Bedford, VA), Spring Hollow Reservoir (Salem, VA), and Lake Sunapee (Sunapee, NH). Beaverdam, Carvins Cove, Falling Creek, and Spring Hollow Reservoirs are owned and operated by the Western Virginia Water Authority as primary or secondary drinking water sources for Roanoke, Virginia; Gatewood Reservoir is a drinking water source for the Town of Pulaski, Virginia; and Smith Mountain Lake is jointly treated by the Bedford Regional Water Authority and the Western Virginia Water Authority as a drinking water source for Franklin County, Virginia. Claytor Lake is managed for hydroelectric power generation by the Appalachian Power Company. Lake Sunapee is a glacially-formed lake known for its oligotrophic water quality. The dataset consists of depth profiles of chlorophyll a samples generally measured at the deepest site of each reservoir adjacent to the dam or at the buoy site of Lake Sunapee. The water column samples were collected approximately fortnightly from March-April and weekly from May-October at Falling Creek Reservoir and Beaverdam Reservoir, approximately fortnightly from May-August in most years at Carvins Cove Reservoir, approximately fortnightly from May-August in Gatewood and Spring Hollow Reservoirs from 2014-2016, approximately fortnightly from May-August of 2014 in Smith Mountain Lake, sporadically from May-August of 2014 in Claytor Lake, and sporadically from June-August of 2021-2022 and 2024 in Lake Sunapee. Additional chlorophyll a samples were collected at multiple upstream and inflow sites along tributaries to Beaverdam and Falling Creek Reservoirs in summer 2019. The water samples collected were analyzed for both phaeophytin and chlorophyll a to quantify and correct for degraded phytoplankton within the sample.

本数据集针对美国弗吉尼亚州西南部7座淡水水库以及美国新罕布什尔州中部1座淡水湖，于2014年至2024年间开展水柱叶绿素a（chlorophyll a）分析。这些水体分别为：比弗达姆水库（Beaverdam Reservoir，弗吉尼亚州文顿）、卡文斯科夫水库（Carvins Cove Reservoir，弗吉尼亚州罗阿诺克）、克莱托尔湖（Claytor Lake，弗吉尼亚州普拉斯基）、福灵溪水库（Falling Creek Reservoir，弗吉尼亚州文顿）、盖特伍德水库（Gatewood Reservoir，弗吉尼亚州普拉斯基）、史密斯山湖（Smith Mountain Lake，弗吉尼亚州贝德福德）、斯普林霍洛水库（Spring Hollow Reservoir，弗吉尼亚州塞勒姆）以及萨纳皮湖（Lake Sunapee，新罕布什尔州萨纳皮）。
比弗达姆、卡文斯科夫、福灵溪及斯普林霍洛水库由西弗吉尼亚水务管理局（Western Virginia Water Authority）所有并运营，作为弗吉尼亚州罗阿诺克市的一级或二级饮用水水源；盖特伍德水库为弗吉尼亚州普拉斯基镇的饮用水水源；史密斯山湖由贝德福德区域水务管理局与西弗吉尼亚水务管理局联合处理，作为弗吉尼亚州富兰克林县的饮用水水源。克莱托尔湖由阿巴拉契亚电力公司（Appalachian Power Company）管理，用于水力发电。萨纳皮湖为冰川成因湖泊，以其贫营养（oligotrophic）水质闻名。
本数据集包含各水库紧邻大坝的最深测点，以及萨纳皮湖浮标测点的叶绿素a浓度垂直剖面数据。采样频率详情如下：福灵溪水库与比弗达姆水库的水柱样本于3-4月约每两周采集一次，5-10月每周采集一次；多数年份中卡文斯科夫水库的样本于5-8月每两周采集一次；2014-2016年，盖特伍德与斯普林霍洛水库的样本于5-8月每两周采集一次；2014年史密斯山湖的样本于5-8月每两周采集一次；2014年克莱托尔湖的样本仅在5-8月零星采集；2021-2022年及2024年萨纳皮湖的样本仅在6-8月零星采集。
2019年夏季，研究团队还在比弗达姆与福灵溪水库的支流沿岸多个上游及入水口测点额外采集了叶绿素a样本。所采集的水样均针对褐藻素（phaeophytin）与叶绿素a开展分析，以量化并校正样本中降解的浮游植物。