PIE LTER dissolved nutrient and particulate concentrations of freshwater inputs to the Plum Island estuarine system, Massachusetts, taken approximately monthly.

Multi-year data of water chemistry including nutrient concentrations for various forms of N, P, C, as well as suspended sediments, was determined from monthly grab samples taken at watershed inputs to the Plum Island Sound Estuary. Sampling sites were the Ipswich River (Sylvania Dam, Ipswich, MA), Parker River Dam (Central St, Newbury, MA), Egypt River (Ipswich, MA) Mill River (Newbury, MA), Muddy Run (Ipswich, MA), Little River (Newbury, MA). These nutrient concentrations are then used in conjunction with USGS discharge data (recorded at gages in the Parker River at Byfield, MA and the Ipswich River at Ipswich, MA) to calculate annual nutrient loading to the Plum Island Sound Estuary, coming over each dam. Annual yield is also calculated for both dams. Refer to file WAT-VA-Load for loading data.本数据集包含多年水体化学观测数据，涵盖多种形态氮（Nitrogen, N）、磷（Phosphorus, P）、碳（Carbon, C）的营养盐浓度及悬浮沉积物含量，数据源自普拉姆岛湾河口（Plum Island Sound Estuary）流域各输入点采集的月度瞬时水样。 本次布设的采样点位包括：伊普斯威奇河（马萨诸塞州伊普斯威奇市西尔瓦尼亚大坝）、帕克河大坝（马萨诸塞州纽伯里市中央街）、埃及河（马萨诸塞州伊普斯威奇市）、米尔河（马萨诸塞州纽伯里市）、泥泞溪（马萨诸塞州伊普斯威奇市）以及利特尔河（马萨诸塞州纽伯里市）。 随后将上述营养盐浓度数据与美国地质调查局（United States Geological Survey, USGS）径流监测数据相结合，该数据取自马萨诸塞州拜菲尔德市帕克河与马萨诸塞州伊普斯威奇市伊普斯威奇河的水文监测站点，用以计算各大坝向普拉姆岛湾河口输入的年度营养盐负荷量，同时计算两座大坝的年营养盐产出量。 负荷相关数据详见WAT-VA-Load文件。