Hourly water chemistry measurements at the mouth of West Falmouth Harbor, MA, USA from 2005 to 2019 and 2023

West Falmouth Harbor (West Falmouth, MA, USA) has been experiencing a dramatic increase in nitrogen loading from an upgradient municipal wastewater treatment facility since the early 2000s. As part of a long-term study into the effects of this nitrogen enrichment, we have been measuring water chemistry at the mouth of the harbor to calculate exchange between the harbor and adjacent coastal waters of Buzzards Bay. Water samples were taken hourly over 24- to 48-hour periods during several periods in 2005-2009, 2014, 2017, 2019, and 2023. Data from 2005-2009 were collected year-round; samples from 2014 and later were collected during June through August. Samples were processed for ammonium, phosphate, nitrate + nitrite, total nitrogen, and total phosphorus unless otherwise notated. During some sampling years, additional samples were run for silicate, chlorophyll, total dissolved nitrogen, total dissolved phosphorus, dissolved organic carbon, particulate organic carbon, and particulate organic nitrogen. Salinity is reported for all samples. Samples were collected with an ISCO autosampler and stored on ice until analysis. Full analysis details and quality control methods are available in Hayn et al. 2014 (doi: 10.1007/s12237-013-9699-8) and Hayn 2025 (doi: 10.7298/btm6-ba76).

美国马萨诸塞州西法尔茅斯港（West Falmouth Harbor）自21世纪初以来，正经历来自上游市政污水处理设施的氮负荷急剧增长。作为该氮富集效应长期研究的组成部分，本团队于港口水域开展水化学监测，以计算该港口与邻近巴泽兹湾（Buzzards Bay）近岸海水间的水体交换量。
2005-2009年、2014年、2017年、2019年及2023年的多个采样时段内，研究团队在24至48小时的周期内每小时采集一次水样；其中2005-2009年的数据为全年采集，2014年及之后的采样仅在6月至8月开展。
除非另有标注，所有水样均检测铵态氮、磷酸盐、硝态氮+亚硝态氮、总氮及总磷。部分采样年份还额外开展了硅酸盐、叶绿素、总溶解氮、总溶解磷、溶解有机碳、颗粒有机碳及颗粒有机氮的检测。所有样品均记录盐度数据。
水样采用ISCO自动采样器（ISCO autosampler）采集，采集后置于冰上保存直至分析。完整的分析流程与质量控制方法详见Hayn等人2014年的研究（DOI: 10.1007/s12237-013-9699-8）及Hayn 2025年的研究（DOI: 10.7298/btm6-ba76）。