Data Release
Local Radiocarbon Reservoir Age (ΔR) Variability from the Nearshore and Open-Ocean Environments of the Florida Keys Reef Tract During the Holocene and Associated U-Series and Radiocarbon Data
By Lauren T. Toth,1 Hai Cheng,2,3 R. Lawrence Edwards,3 Erica Ashe,4 and Julie Richey1
1U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, 600 Fourth Street South, St. Petersburg, FL 33701, USA
2 Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, USA
3 Institute of Global and Environmental Change, Xi'an Jiaotong University, Xi'an 310049, China
4 Department of Statistics and Biostatistics, Rutgers University, 110 Frelinghuysen Rd., Piscataway, NJ 08854, USA
Summary
Holocene-aged corals from reef cores collected throughout the Florida Keys reef tract (FKRT; Fig. 1) were dated using a combination of U-series and radiocarbon techniques to quantify the millennial-scale variability in the local radiocarbon reservoir age (ΔR) of the shallow water environments of south Florida. ΔR provides a measure of the deviation of local radiocarbon concentrations of marine environments from the global average and can be used as a tracer of oceanic circulation and local hydrology. We combined our coral-based estimates of ΔR using statistical modelling to reconstruct millennial-scale variability in ΔR at locations on the FKRT with (“nearshore”) and without (“open ocean”) terrestrial influence. We also used the models to provide temporally-explicit estimates of ΔR that can be used in radiocarbon calibrations of marine samples from the region. In v.1.0, the coral-based estimates of ΔR were derived using data from the Marine13 radiocarbon calibration curve (Reimer and others, 2013). In v.2.0, the ΔR estimates were instead derived using the Marine20 radiocarbon calibration curve (Heaton and others, 2020). For further information regarding data collection and analysis methods refer to Toth et al. (2017).
Toth, L.T., Cheng,H., Edwards, R.L., Ashe, E., and Richey, J.N., 2017, Millennial-scale variability in the local radiocarbon reservoir age of south Florida during the Holocene: Quaternary Geochronology, v. 42, p. 130–143, https://doi.org/10.1016/j.quageo.2017.07.005.
Note: This data release was versioned on August 30, 2021. Please see the Suggested Citation section for details.
Data
| File Name and Description | Metadata (XML format) | Metadata (text format) | Download File |
|---|---|---|---|
| FKRT_Holocene_U_Series_Data.zip U-series data used to determine the 230Th ages of 68 Holocene corals from the FKRT (.csv, .xlsx) |
FL_keys_radiocarbon_reservoir_ age_variability_metadata.xml |
FL_keys_radiocarbon_reservoir_ age_variability_metadata.txt |
FKRT_Holocene_U_Series_Data.zip (45 KB) |
| FKRT_Holocene_Radiocarbon_Data.zip Radiocarbon data used to determine the conventional radiocarbon ages of 68 Holocene corals from the FKRT (.csv, .xlsx) |
Same as above | Same as above | FKRT_Holocene_Radiocarbon_Data.zip (40 KB) |
| FKRT_Coral_Based_DeltaR_Marine13.zip ΔR estimates using the Marine13 radiocarbon calibration curve for the 68 corals from the FKRT, description of those coral samples, and summary of data used to calculate ΔR (.csv, .xlsx) |
Same as above | Same as above | FKRT_Coral_Based_DeltaR_Marine13.zip (45 KB) |
| DeltaR_Data_Screening_Summary.zip Summary of the data screening procedures that were used to determine which data were included in the models of ΔR variability (.csv, .xlsx) |
Same as above | Same as above | DeltaR_Data_Screening_Summary.zip (37 KB) |
| Modeled_Nearshore_DeltaR_vs_ 230Th_Marine13.zip Statistical model output of ΔR variability from nearshore environments from 9,500 years ago to present with a 5-year time step using 230Th age and ΔR values using the Marine13 radiocarbon calibration curve to derive age before present (.csv, .xlsx) |
Same as above | Same as above | Modeled_Nearshore_DeltaR_vs_ 230Th_Marine13.zip (121 KB) |
| Modeled_Nearshore_DeltaR_vs_ Conventional_14C_Marine13.zip Modeled predictions of nearshore ΔR over the range of conventional radiocarbon ages from 9,000 years ago to present with a 5-year time step based on and ΔR values derived using the Marine13 radiocarbon calibration curve (.csv, .xlsx) |
Same as above | Same as above | Modeled_Nearshore_DeltaR_vs_ Conventional_14C_Marine13.zip (138 KB) |
| Modeled_OpenOcean_DeltaR_vs_ 230Th_Marine13.zip Statistical model output of ΔR variability from open-ocean environments from 8,000 years ago to present with a 5-year time step using 230Th age and ΔR values using the Marine13 radiocarbon calibration curve to derive age before present (.csv, .xlsx) |
Same as above | Same as above | Modeled_OpenOcean_DeltaR_vs_ 230Th_Marine13.zip (105 KB) |
| Modeled_OpenOcean_DeltaR_vs_ Conventional_14C_Marine13.zip Modeled predictions of open-ocean ΔR over the range of conventional radiocarbon ages from 7,500 years ago to present with a 5-year time step based on and ΔR values derived using the Marine13 radiocarbon calibration curve (.csv, .xlsx) |
Same as above | Same as above | Modeled_OpenOcean_DeltaR_vs_ Conventional_14C_Marine13.zip (103 KB) |
| FKRT_Coral_Based_DeltaR_Marine20.zip ΔR estimates using the Marine20 radiocarbon calibration curve for the 68 corals from the FKRT, description of those coral samples, and summary of data used to calculate ΔR (.csv, .xlsx) |
FL_keys_radiocarbon_reservoir_age_ variability_metadata_Marine20.xml |
FL_keys_radiocarbon_reservoir_age_ variability_metadata_Marine20.txt |
FKRT_Coral_Based_DeltaR_Marine20.zip (45 KB) |
| Modeled_Nearshore_DeltaR_vs_ 230Th_Marine20.zip Statistical model output of ΔR variability from nearshore environments from 9,500 years ago to present with a 5-year time step using 230Th age and ΔR values using the Marine20 radiocarbon calibration curve to derive age before present (.csv, .xlsx) |
Same as above | Same as above | Modeled_Nearshore_DeltaR_vs_ 230Th_Marine20.zip (121 KB) |
| Modeled_Nearshore_DeltaR_vs_ Conventional_14C_Marine20.zip Modeled predictions of nearshore ΔR over the range of conventional radiocarbon ages from 9,000 years ago to present with a 5-year time step based on and ΔR values derived using the Marine20 radiocarbon calibration curve (.csv, .xlsx) |
Same as above | Same as above | Modeled_Nearshore_DeltaR_vs_ Conventional_14C_Marine20.zip (138 KB) |
| Modeled_OpenOcean_DeltaR_vs_ 230Th_Marine20.zip Statistical model output of ΔR variability from open-ocean environments from 8,000 years ago to present with a 5-year time step using 230Th age and ΔR values using the Marine20 radiocarbon calibration curve to derive age before present (.csv, .xlsx) |
Same as above | Same as above | Modeled_OpenOcean_DeltaR_vs_ 230Th_Marine20.zip (105 KB) |
| Modeled_OpenOcean_DeltaR_vs_ Conventional_14C_Marine20.zip Modeled predictions of open-ocean ΔR over the range of conventional radiocarbon ages from 7,500 years ago to present with a 5-year time step based on and ΔR values derived using the Marine20 radiocarbon calibration curve (.csv, .xlsx) |
Same as above | Same as above | Modeled_OpenOcean_DeltaR_vs_ Conventional_14C_Marine20.zip (103 KB) |
Figure 1. Map of the Florida Keys reef tract (FKRT). The FKRT extends across six sub-regions (Dry Tortugas National Park [N.P.], the Marquesas, the Lower, Middle, and Upper Keys, and Biscayne National Park) and is bounded by the Florida Keys National Marine Sanctuary (FKNMS). Sampling locations indicate the reefs where the Holocene reef cores sampled in this study were collected.
Suggested Citation
Toth, L.T., Cheng, H., Edwards, R.L., Ashe, E., and Richey, J.N., 2017, Local radiocarbon reservoir age (ΔR) variability from the nearshore and open-ocean environments of the Florida Keys reef tract during the Holocene and associated U-series and radiocarbon data (ver. 2.0, August 2021): U.S. Geological Survey data release, https://doi.org/10.5066/F7P8492Q.
First posted September 07, 2017
Revised August 30, 2021, ver. 2.0