Mississippi River spatial water chemistry Environmental Research Letters datasets

We mapped surface water chemistry along the entire length of the Upper Mississippi
River (UMR) to understand spatial patterns in nitrate sources and processing. We used a
sensor-based and boat-mounted sensing platform to continuously measure underway water
chemistry. Measurements were linked with global positioning systems (GPS) to create maps of
surface water chemistry. Here, we archive data associated with an Environmental Research
Letters publication (Loken et al. 2018). Data include a single spatial survey of the entire
length of the UMR (Minneapolis, Minnesota to Cairo, Illinois) in August 2015 and repeat
surveys in Navigation Pool 8 (located near La Crosse, WI). Data have been provided in three
formats (raw, hydraulic-corrected, and tau-corrected). Additionally, we archive laboratory
chemistry data from water samples collected during the project. Sites include a range of
main channel, backwaters, and tributaries. Water chemistry samples were analyzed at the
North Temperate Lakes - Long Term Ecological Research facility and linked with underway
sensor measurements.

本研究沿密西西比河上游（Upper Mississippi River, UMR）全河段开展地表水化学测绘，旨在解析硝酸盐来源与转化过程的空间分布格局。
研究采用船载传感器探测平台，对航行进过程中的水体化学特性进行连续监测。
将监测数据与全球定位系统（global positioning systems, GPS）数据关联，以此生成地表水化学空间分布图。
本数据集归档了发表于《Environmental Research Letters》的论文（Loken等，2018）所关联的相关数据。
数据包含2015年8月对密西西比河上游全河段（明尼苏达州明尼阿波利斯市至伊利诺伊州开罗市）的单次空间测绘，以及对位于威斯康星州拉克罗斯附近的航运池8号（Navigation Pool 8）的重复监测数据。
数据共提供三种格式：原始数据、水力校正数据与tau校正数据。
此外，本数据集还归档了本研究期间采集的水样的实验室化学分析数据。
监测点位涵盖主河道、回水区与支流等多种类型。
所有水样的化学分析均在北温带湖泊长期生态研究站（North Temperate Lakes - Long Term Ecological Research）完成，并与航行进过程中的传感器监测数据进行关联匹配。