Georeferenced Lake Nutrient Chemistry (GLNC) Database (updated March 2019)

This fileset includes files associated with the Georeferenced Lake Nutrient Chemistry (GLNC) Database, which is described in an open access publication in Scientific Data:Williams, J.J., Labou, S.G. 2017. A database of georeferenced nutrient chemistry data for mountain lakes of the Western United States. Scientific Data. 4: 170069. http://dx.doi.org/10.1038/sdata.2017.69The Georeferenced Lake Nutrient Chemistry (GLNC)
Database was constructed to create a spatially-extensive lake chemistry
database needed to assess atmospheric nutrient deposition effects on Western
U.S. mountain lakes. The database includes nitrogen and phosphorus water chemistry
data spanning 1964-2015, with 148,336 chemistry results from 51,048 samples
collected across 3,602 lakes in the Western U.S. Data were obtained from public
databases, government agencies, scientific literature, and researchers, and were
formatted into a consistent table structure. All data are georeferenced to a
modified version of the National Hydrography Dataset Plus version 2. The
database is transparent and reproducible; R code and input files used to format
data are provided in an appendix. The database will likely be useful to those assessing
spatial patterns of lake nutrient chemistry associated with atmospheric deposition
or other environmental stressors. The most recent version of the database was uploaded March 23, 2019.Updates Log: Updated March 2019 (GLNC_March_2019.zip) to correct total phosphorus (TP) units in s18 (western lake survey). In March 2017 version, orig_units were incorrect (should have been ug/L). Values in 'value' field should be have been divided by 1000 to get units
of mg P/L consistent with parameter "TP_mg/L" and units "mg P/L". This has now been corrected.

本文件集包含与地理参照湖泊营养化学数据库（Georeferenced Lake Nutrient Chemistry，简称GLNC）相关的文件。该数据库在《Scientific Data》杂志上以开放获取的形式进行了描述：Williams, J.J., Labou, S.G. 2017. A database of georeferenced nutrient chemistry data for mountain lakes of the Western United States. Scientific Data. 4: 170069. http://dx.doi.org/10.1038/sdata.2017.69。该GLNC数据库旨在构建一个空间广泛覆盖的湖泊化学数据库，以便评估大气营养沉积对美国西部山区湖泊的影响。数据库涵盖了1964-2015年间氮和磷的水化学数据，包括来自美国西部3,602个湖泊的51,048个样本的148,336个化学结果。数据来源于公共数据库、政府机构、科学文献和研究人员，并已格式化为一致的表格结构。所有数据均参照修改后的国家水文数据集Plus版本2进行地理参照。数据库具有透明性和可重复性；数据格式化的R代码和输入文件附于附录中。该数据库对于评估与大气沉积或其他环境胁迫相关的湖泊营养化学的空间模式将非常有用。最新版本的数据库于2019年3月23日上传。更新日志：2019年3月更新（GLNC_March_2019.zip）以纠正s18（西部湖泊调查）中总磷（TP）的单位。在2017年3月版本中，原单位有误（应为ug/L）。'value'字段中的值应除以1000以获得与参数“TP_mg/L”和单位“mg P/L”一致的mg P/L单位。现在已更正。