Water Oxygen and Hydrogen Isotope Ratios From the West Florida Shelf

To assess the spatial and temporal hydrographic variability along the West Florida Shelf (including Tampa Bay and Charlotte Harbor), stable oxygen (d18O) and hydrogen (dD) isotope ratios were measured using water samples collected from across the region by the U.S. Geological Survey (USGS) and collaborators. Surface, bottom, and groundwater samples from a marine well network along the central West Florida Shelf, as well as surface, intermediate, and bottom water samples within the Tampa Bay estuary were collected from 2022–2024 during USGS Field Activity Numbers (FANs) 2022-340-FA (Chestang and others, 2025) and 2022-349-DD (Hunt, 2025; Tamborski and others, 2025). Additional samples from Tampa Bay marine and riverine surface waters were collected in 2025, corresponding to USGS FAN 2025-311-DD. This data release also includes d18O and dD data obtained by digitizing legacy data previously published by Sackett and others (1991) and Netratanawong (1995).

Chestang, E.S., Ellis, A.M., Smith, C.G., Knapp, A., Tamborski, J.J., and Lindgren, A., 2025, Short-lived radium-isotope (Radium-223 and -224) specific activity for samples collected between November 2022 and March 2024 along the West Florida Shelf (Indian Rocks Beach, Nature Coast, and Venice Headland) (ver. 2.0, August 2025): U.S. Geological Survey data release, https://doi.org/10.5066/P1ZIOFSX.

Hunt, H.R., 2025, Isotopic fingerprints of the coastal margins: tracing dissolved iron sources from land to sea: USF Tampa Graduate Theses and Dissertations, https://digitalcommons.usf.edu/etd/10872.

Tamborski, J., Lindgren, A., Alorda-Kleinglass, A., Buck, K.N., Boiteau, R.M., Chappell, P.D., Conway, T.M., Smith, C., and Knapp, A.N., 2025, Dissolved radium from STING I Cruise AE2305 on R/V Atlantic Explorer and STING II Cruise EN704 on R/V Endeavor and U.S. Geological Survey small boat surveys in the Gulf of Mexico from Feb to Jul 2023: Biological and Chemical Oceanography Data Management Office (BCO-DMO), https://doi.org/10.26008/1912/bco-dmo.982223.1.

Sackett, W.M., Netratanawong, T., and Holmes, M., 1991, Stable carbon and oxygen isotope variations in waters of the Tampa Bay estuary: Proceedings of the Tampa Bay Area Scientific Information Symposium 2, pp. 137-142.

Netratanawong, T., 1995, Stable isotopic investigation of the hydrological cycle of west-central Florida: USF Tampa Graduate Theses and Dissertations, https://digitalcommons.usf.edu/etd/9837.