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St. Petersburg Coastal and Marine Science Center

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
2Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, USA
3Institute of Global and Environmental Change, Xi’an Jiaotong University, Xi’an 310049, China
4Department 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. For further information regarding data collection and analysis methods refer to Toth et al. (2016, 2017). This research is a part of the U.S. Geological Survey (USGS) Coral Reef Ecosystem Studies Project (https://coastal.er.usgs.gov/crest/).

Toth, L.T., H. Cheng, R.L. Edwards, E. Ashe, and J.N. Richey, 2017, Millennial-scale variability in the local radiocarbon reservoir age of south Florida during the Holocene: Quaternary Geochronology.

Toth, L.T., Stathakopoulos, A., and Kuffner, I.B., 2016, The structure and composition of Holocene coral reefs in the Middle Florida Keys: U.S. Geological Survey Open-File Report 2016–1074, 27 p., http://dx.doi.org/10.3133/ofr20161074.

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.
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.
Same as above Same as above FKRT_Holocene_Radiocarbon_Data.zip
(40 KB)
FKRT_Coral_Based_DeltaR.zip
ΔR estimates for the 68 corals from the FKRT, description of those coral samples, and summary of data used to calculate ΔR.
Same as above Same as above FKRT_Coral_Based_DeltaR.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.
Same as above Same as above DeltaR_Data_Screening
_Summary.zip

(37 KB)
Modeled_Nearshore_DeltaR_vs_230Th.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 to derive age before present.
Same as above Same as above Modeled_Nearshore_DeltaR
_vs_230Th.zip

(121 KB)
Modeled_Nearshore_DeltaR_vs_Conventional_14C.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.
Same as above Same as above Modeled_Nearshore_DeltaR
_vs_Conventional_14C.zip

(138 KB)
Modeled_OpenOcean_DeltaR_vs_230Th.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 to derive age before present.
Same as above Same as above Modeled_OpenOcean_DeltaR
_vs_230Th.zip

(105 KB)
Modeled_OpenOcean_DeltaR_vs_Conventional_14C.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.
Same as above Same as above Modeled_OpenOcean_DeltaR
_vs_Conventional_14C.zip

(103 KB)

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.
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: U.S. Geological Survey data release, https://doi.org/10.5066/F7P8492Q.

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