LAGOS-NE v.1.054.1 - Lake water quality time series and geophysical data from a 17-state region of the United States

Time series of mean summer total nitrogen (TN), total phosphorus (TP), stoichiometry (TN:TP) and chlorophyll values from 2913 unique lakes in the Midwest and Northeast United States. Epilimnetic nutrient and chlorophyll observations were derived from the Lake Multi-Scaled Geospatial and Temporal Database LAGOS-NELIMNO version 1.054.1, and come from 54 disparate data sources. These data were used to assess long-term monotonic changes in water quality from 1990-2013, and the potential drivers of those trends (Oliver et al., submitted). Summer was used to approximate the stratified period, which was defined as June 15 to September 15. The median number of observations per summer for a given lake was 2, but ranged from 1 to 83. The rules for inclusion in the database were that, for a given water quality parameter, a lake must have an observation in each period of 1990-2000 and 2001-2011. Additionally, observations must span at least 5 years. Each unique lake with nutrient or chlorophyll data also has supporting geophysical data, including climate, atmospheric deposition, land use, hydrology, and topography derived at the lake watershed (variable prefix “iws”) and HUC 4 (variable prefix “hu4”) scale. Lake-specific characteristics, such as depth and area, are also reported. The geospatial data came from LAGOS-NEGEO version 1.03. For more specific information on how LAGOS-NE was created, see Soranno et al. 2015. Soranno P.A., Bissell E.G., Cheruvelil K.S., Christel S.T., Collins S.M., Fergus C.E., Filstrup C.T., Lapierre J.-F., Lottig N.R., Oliver S.K., Scott C.E., Smith N.J., Stopyak S., Yuan S., Bremigan M.T., Downing J.A., Gries C., Henry E.N., Skaff N.K., Stanley E.H., Stow C.A., Tan P.-N., Wagner T., and Webster K.E. 2015. Building a multi-scaled geospatial temporal ecology database from disparate data sources: fostering open science and data reuse. Gigascience 4: 28. doi: 10.1186/s13742-015-0067-4.

美国中西部与东北部地区2913个独立湖泊的夏季平均总氮（Total Nitrogen, TN）、总磷（Total Phosphorus, TP）、总氮总磷化学计量比（TN:TP）及叶绿素浓度时间序列数据集。湖上层营养盐与叶绿素观测数据源自湖泊多尺度地理空间与时间数据库LAGOS-NELIMNO版本1.054.1，整合自54个不同数据源。本数据集被用于评估1990-2013年间水质的长期单调变化趋势，以及该类趋势的潜在驱动因子（Oliver等，已投稿）。本研究以6月15日至9月15日作为湖泊分层期的近似夏季时段。单个湖泊在单个夏季的观测次数中位数为2，区间跨度为1至83次。数据集入选规则如下：针对某一水质参数，目标湖泊需在1990-2000年与2001-2011年两个时段各存在至少一条观测记录；同时，观测时长需至少覆盖5年。所有包含营养盐或叶绿素数据的独立湖泊，均配套有流域尺度（变量前缀为"iws"）与HUC 4尺度（变量前缀为"hu4"）下的气候、大气沉降、土地利用、水文及地形等地球物理数据。同时还报告了湖泊自身的水深与面积等专属特征参数。该地理空间数据源自LAGOS-NEGEO版本1.03。如需了解LAGOS-NE的具体构建细节，请参阅Soranno等2015年的研究：Soranno P.A., Bissell E.G., Cheruvelil K.S., Christel S.T., Collins S.M., Fergus C.E., Filstrup C.T., Lapierre J.-F., Lottig N.R., Oliver S.K., Scott C.E., Smith N.J., Stopyak S., Yuan S., Bremigan M.T., Downing J.A., Gries C., Henry E.N., Skaff N.K., Stanley E.H., Stow C.A., Tan P.-N., Wagner T., and Webster K.E. 2015. Building a multi-scaled geospatial temporal ecology database from disparate data sources: fostering open science and data reuse. Gigascience 4: 28. doi: 10.1186/s13742-015-0067-4.