ABSTRACT:

High temporal resolution monitoring of in-situ nitrogen and carbon export from four catchments along an exurban-urban gradient in the North Carolina Piedmont was conducted between the winter of 2017 and the winter of 2019. Nitrate export was measured with S::CAN and SUNA in-situ spectrometers, and total dissolved nitrogen and dissolved organic carbon was measured with S::CAN UV-Vis spectrometers. Sensor readings were calibrated to lab analyzed grab samples and automated storm samples. A subset of samples were measured for stable isotopes of nitrate, 15N and 18O. This data supports the findings of the manuscript "High frequency monitoring and nitrate sourcing reveals baseflow and stormflow controls on total dissolved nitrogen and carbon export along a rural-urban gradient" submitted to WRR for review in Nov. 2023. Sampling methodology and geospatial characterization of study catchments are reported in the manuscript text, associated supporting information, and Delesantro et al., 2022.

ABSTRACT:

Baseflow grab samples and flow measurements were collected bi-weekly from 27 urbanized catchments in the NC piedmont over periods of one to fours years between Fall 2013 and Fall 2019. A subset of 13 catchments were sampled for isotopic nitrate in 2018. Sampled catchments were selected to approximate the median and span most of the range in metrics of landcover, infrastructure, and population density for developed NHD+ catchments in the Haw and Upper Neuse River basins. Land cover, infrastructure, topography, geology, and hydrogeomorphic position of development features were characterized for the study area. This data supports the findings of the manuscript "The sources and transport of baseflow N loading across a developed rural-urban gradient" submitted to WRR for review in Nov. 2021.