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的西法尔茅斯港（West Falmouth Harbor）自21世纪初以来，其氮负荷因上游市政污水处理设施的排放出现了急剧增长。作为针对此次氮富集效应开展的长期研究的一部分，我们持续在港口水域监测水化学指标，以测算该港与毗邻的布泽尔湾（Buzzards Bay）近岸海域之间的水体交换量。在2005-2009年、2014年、2017年、2019年及2023年的多个采样周期内，我们以每小时1次的频率采集水样，每个采样周期持续24至48小时。2005-2009年的采样数据为全年采集；2014年及之后的采样仅在每年6月至8月开展。除非另有标注，所有水样均会针对铵盐、磷酸盐、硝酸盐+亚硝酸盐、总氮及总磷开展检测分析。在部分采样年份中，还会额外针对硅酸盐、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开展检测。所有水样均会上报盐度数据。水样采用ISCO自动采样器（ISCO autosampler）采集，并全程低温冰存直至实验室分析。完整的分析流程与质量控制方法可参见Hayn等人2014年发表的研究（DOI: 10.1007/s12237-013-9699-8）以及Hayn 2025年的成果（DOI: 10.7298/btm6-ba76）。