Water quality in the Elwha River estuary, Washington, from 2006 to 2014.

This portion of the data release presents water column dissolved nutrient concentration data and water quality parameters from samples collected in the Elwha River estuary, Washington, in 2006, 2007, 2013, and 2014 (USGS Field Activities L-15-13-PS, L-24-13-PS, T-R5-13-PS, T-R6-13-PS, T-RA-14-PS, 2014-614-FA, 2014-628-FA, 2014-633-FA, 2014-666-FA). Water column samples were collected by hand in acid-washed opaque bottles from multiple locations. Water quality was measured using a handheld Hydolab Data Sonde 4a. The locations of water sample collections were determined with a hand-held global positioning system (GPS). The water samples were filtered through GF/F filters immediately after collection. The filtrate was collected in scintillation vials and frozen until analysis at either the University of Washington marine chemistry lab (2006 and 2007 samples) or the University of California Santa Barbara Marine Science Institute analytical lab (2013 and 2014 samples). Nutrient concentration and water quality data are provided in a comma-delimited spreadsheet (.csv).

本公开数据集的该部分收录了2006、2007、2013及2014年于美国华盛顿州埃尔瓦河河口采集的水体柱溶解态营养盐浓度数据与水质参数，对应野外作业编号为美国地质调查局（USGS）的L-15-13-PS、L-24-13-PS、T-R5-13-PS、T-R6-13-PS、T-RA-14-PS、2014-614-FA、2014-628-FA、2014-633-FA、2014-666-FA。
水体柱样本通过人工方式，使用经酸洗处理的不透光采样瓶于多个采样点位采集。
水质参数采用手持式Hydolab Data Sonde 4a进行测定。
水体采样点位通过手持式全球定位系统（GPS）确定。
采集后的水体样本需立即通过GF/F滤膜进行过滤处理。
过滤所得滤液收集于闪烁瓶中并冷冻保存，随后分别送至华盛顿大学海洋化学实验室（用于2006年与2007年样本）或加州大学圣巴巴拉分校海洋科学研究所分析实验室（用于2013年与2014年样本）完成分析检测。
营养盐浓度与水质数据以逗号分隔的电子表格（.csv）格式提供。