DOI: 10.6084/m9.figshare.26800921.v1
title: Data and scripts for "Freshwater salinization syndrome is degrading streamwater quality in the National Capital Region national parks, USA"

description: Data and scripts for "Freshwater salinization syndrome is degrading streamwater quality in the National Capital Region national parks, USA" by Daniel T. Myers, Diana Oviedo-Vargas, Scott Ensign, Melinda Daniels, John Paul Schmit, Marc Peipoch, and Jinjun Kan<br><br>The file "Myers et al. script.R" reproduces the figures and statistics in the manuscript from the data, run in R version 4.3.1, with the following packages:<br>dplyr: https://cran.r-project.org/web/packages/dplyr/index.htmltidyr: https://cran.r-project.org/web/packages/tidyr/index.htmllubridate: https://cran.r-project.org/web/packages/lubridate/index.htmlsf: https://cran.r-project.org/web/packages/sf/index.htmlmblm: https://cran.r-project.org/web/packages/mblm/index.htmlquantreg: https://cran.r-project.org/web/packages/quantreg/index.html<br><br>The file "20240129_wqp_wqx_bss_wq_npsncrn.csv" contains specific conductance records from 2005-2023, following established protocol (Norris et al., 2011).<br>Norris, M. E., Pieper, J. M., Watts, T. M., & Cattani, A. (2011). National Capital Region Network Inventory and Monitoring Program water chemistry and quantity monitoring protocol version 2.0: Water chemistry, nutrient dynamics, and surface water dynamics vital signs. Natural Resource Report NPS/NCRN/NRR—2011/423. National Park Service, Fort Collins, Colorado. https://irma.nps.gov/DataStore/Reference/Profile/2172524<br><br>The file "Watershed conditions.csv" contains watershed characteristics for each monitored stream (current and historic), from the following data sources.<br>Bock, A. R., Falcone, J. A., & Oelsner, G. P. (2018). (2023). Estimates of road salt application across the conterminous United States, 1992–2019 (ver. 2.0, August 2023). US Geological Survey Data Release. Doi: Https://Doi. Org/10.5066/P96IX385.<br>Dewitz, J., & USGS. (2021). National Land Cover Database (NLCD) 2019 Products (ver. 2.0, June 2021). In U.S. Geological Survey data release.<br>Falcone, J. A. (2011). GAGES II (Geospatial Attributes of Gages for Evaluating Streamflow) summary report. In Usgs (Issue September 2011).<br>Morgan, R. P., Kline, K. M., & Cushman, S. F. (2007). Relationships among nutrients, chloride and biological indices in urban Maryland streams. Urban Ecosystems, 10(2). https://doi.org/10.1007/s11252-006-0016-1<br>Olson, J. R., & Cormier, S. M. (2019). Modeling Spatial and Temporal Variation in Natural Background Specific Conductivity. Environmental Science and Technology, 53(8), 4316–4325. https://doi.org/10.1021/ACS.EST.8B06777/SUPPL_FILE/ES8B06777_SI_001.PDF<br>USGS GAP. (2022). Protected Areas Database of the United States (PAD-US) 3.0 (ver. 2.0, March 2023). U.S. Geological Survey Data Release.<br>U.S. Department of Commerce, U.S. Census Bureau, Geography Division. 2020 TIGER/Line Shapefiles (machine readable data files). https://www.census.gov/cgi-bin/geo/shapefiles/index.php.<br><br>For more information, contact:<br>Dan MyersPostdoctoral AssociateStroud Water Research Center970 Spencer Road, Avondale, PA 19311dmyers@stroudcenter.orgO: 610-268-2153