Data and scripts for "Freshwater salinization syndrome is degrading streamwater quality in the National Capital Region national parks, USA"

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., &amp; 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., &amp; 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., &amp; 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., &amp; 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., &amp; 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 [e-mail]: 610-268-2153