Khan, Nicole S.
Toth, Lauren T.
20220706
South Florida mangrove peat radiocarbon metadata
tabular digital data
Khan, Nicole S.
Toth, Lauren T.
Moyer, Ryan P.
Shaw, Jaimie E.
Capar, Paulina
Kemp, Andrew C.
Engelhart, Simon E.
Horton, Benjamin P.
20220706
Mangrove Peat Radiocarbon Ages From Snipe and Swan Key, FL
U.S. Geological Survey data release
doi:10.5066/P9OOL3L4
St. Petersburg, Florida
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
https://doi.org/10.5066/P9OOL3L4
In 2016, U.S. Geological Survey St. Petersburg Coastal and Marine Science Center (USGS SPCMSC) researchers and academic collaborators collected cores of mangrove peat from two islands in the Florida Keys: Snipe Key (24.679°N, 81.653°W) and Swan Key (25.349°N, 80.251°W). This data release contains the radiocarbon ages and associated data for peat samples analyzed throughout the two cores (SNK-16-C1 and SBC-16-C10).
Data were obtained to reconstruct millennial-scale variability in sea-level change of across the Florida Keys in Khan and others (2022).
The cores collected were assigned a Field Activity Number (FAN), 2016-344-FA. FANs are unique identifiers assigned by the USGS to provide more information about the activities conducted in the field for a study. Please visit the Coastal and Marine Geoscience Data System (CMGDS) field activity webpage for more information about the FAN related to this dataset, https://cmgds.marine.usgs.gov/fan_info.php?fan=2016-344-FA.
2016
ground condition
None planned
-81.653
-80.251
25.349
24.679
USGS Metadata Identifier
USGS:f335e6d7-c046-41ce-b5c2-b346e3a0e1dc
ISO 19115 Topic Categories
geoscientificInformation
USGS Thesaurus
radiometric dating
core analysis
push coring
geochronology
paleoceanography
sea-level change
Geographic Names Information System (GNIS)
Florida Keys
USGS Thesaurus
Holocene
None
None
Lauren T. Toth
SOUTHEAST REGION: ST. PETE COASTAL & MARINE SC
Research Physical Scientist
mailing and physical
600 4Th Street South
St. Petersburg
FL
33701
US
727-502-8029
ltoth@usgs.gov
Khan, Nicole S.
Ashe, Erica
Moyer, Ryan P.
Kemp, Andrew C.
Engelhart, Simon E.
Brain, Matthew J.
Toth, Lauren T.
Chappel, Amanda
Christie, Margaret
Kopp, Robert E.
Horton, Benjamin P.
20220730
Relative sea-level change in South Florida during the past ~5,000 years
Global and Planetary Change
Volume 216
https://doi.org/10.1016/j.gloplacha.2022.103902
No formal attribute accuracy tests were conducted.
No formal logical accuracy tests were conducted.
Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
No formal positional accuracy tests were conducted.
No formal positional accuracy tests were conducted.
USGS SPCMSC researchers and academic collaborators collected at total of 91 samples of plant macrofossils or bulk mangrove peat throughout cores SNK-16-C1 and SBC-16-C10, from Snipe Key and Swan Key, respectively, to be used for radiocarbon dating.
Macrofossils of mangrove trunks or branches, terminal stems, or prop root bark were collected for dating, where possible. These samples were cleaned of debris using sterile forceps under a binocular microscope before being sent to Woods Hole Oceanographic Institution’s National Ocean Science Accelerator Mass Spectrometry (NOSAMS) laboratory for analysis. At NOSAMS, the macrofossil samples were acid-base-acid pretreated prior to analysis to remove carbonates and other impurities.
In parts of the core where there were no macrofossils, researchers instead extracted a 1-centimeter (cm) thick layer of bulk mangrove peat. Those samples were passed through a 63-micron sieve and the <63-micron fractions of the peat samples were transferred onto a clean fiberglass filter and dried at 55 degrees Celsius. Then, the dried bulk peat samples on the filters were shipped to NOSAMS for radiocarbon analysis. The bulk peat samples were acid pretreated by NOSAMS prior to analysis.
For additional information on sample preparation, see Khan and others (2022). For additional information about radiocarbon analysis see the NOSAMS website (https://www2.whoi.edu/site/nosams/).
2017
Point
Point
91
Snipe_and_Swan_Key_mangrove_peat_radiocarbon_data.csv, Snipe_and_Swan_Key_mangrove_peat_radiocarbon_data.xlsx
Sample description and radiocarbon data from mangrove peat cores collected at Snipe Key and Swan Key, Florida.
USGS
Core ID
A unique identifier (ID) for the two cores analyzed in this study.
USGS
The core ID is a combination of the site where the core was collected (Snipe Key=SNK, Swan Key=SBC), the year the cores were collected (2016), and the core number (Snipe Key Core #1=C1, Swan Key Core #10=C10).
Accession Number
A unique identifier for each sample assigned by the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) radiocarbon laboratory.
NOSAMS (https://www2.whoi.edu/site/nosams/)
OS-126725
OS-138073
sample number
Depth in core (cm)
The depth in centimeters (cm) from the top of each core where each sample was collected.
USGS
8.5
750.5
centimeters (cm)
Sample type
The type of peat material (Bulk=bulk peat sample, Macro=macrofossil of mangrove wood) that was sampled for radiocarbon dating.
USGS
Bulk
The fine-fraction of bulk mangrove peat (<63 micron) was sampled from the core for radiocarbon dating.
USGS
Macro
Plant macrofossils of mangrove wood (trunk or branches), terminal stems, or prop root bark were sampled from the core for radiocarbon dating.
USGS
Process
The method (process) used by the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) radiocarbon laboratory to determine the radiocarbon ages of the samples.
USGS
(OC) Organic Carbon
This process is used for plant/wood and charcoal samples. These samples first undergo a series of acid-base-acid leaches to remove inorganic carbon and mobile organic acid phases. After that pre-treatment, the organic carbon samples are combusted at a high temperature to produce carbon dioxide for radiocarbon analysis.
NOSAMS (https://www2.whoi.edu/site/nosams/)
(GS) Gas Sample
These samples are submitted to NOSAMS as ampoules of carbon dioxide. Those ampoules are cracked, quantified, split (if required), and transferred to a reaction tube for reduction to pure carbon. The carbon dioxide is reduced with use of a catalyst (iron or cobalt) in the presence of excess hydrogen.
NOSAMS (https://www2.whoi.edu/site/nosams/)
F modern
F modern=Fraction modern, which is a measurement of the deviation of the carbon-14 to carbon-12 (14C/12C) ratio of a sample from “Modern.” Modern is defined as 95% of the radiocarbon concentration (in 1950 C.E.).
NOSAMS (https://www2.whoi.edu/site/nosams/)
0.5049
1.2058
a unitless ratio
F modern uncertainty
The uncertainty in the determination of the deviation of a sample's radiocarbon content from a modern standard (F modern).
NOSAMS (https://www2.whoi.edu/site/nosams/)
0.0013
0.0035
unitless uncertainty on the fraction modern ratio
Age BP
The conventional radiocarbon age of the sample in years before present (BP) where "present" by convention is 1950 C.E. If the radiocarbon age was younger than 1950, then the age is listed as ">Modern".
USGS
105
5490
years before 1950
Age BP uncertainty
The uncertainty in the conventional radiocarbon age of the sample in years. Modern (younger than 1950 C.E.) radiocarbon ages have no uncertainty so in the case of a modern age, this field is blank.
USGS
15
30
radiocarbon years
d13C
A measure of the fractionation of 12C to 13C, expressed as the ratio of 13C to 12C (delta 13C or d13C). This value is used to correct the fraction modern and the conventional radiocarbon age of the sample, measured by the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS). If blank, the d13C of the sample was not measured by NOSAMS.
USGS
-30.15
-20.10
unitless ratio
D14C
D14C (Delta 14C) is the relative difference between the absolute international standard (base year 1950) and sample activity, corrected for age and d13C (delta 13C).
NOSAMS (https://www2.whoi.edu/site/nosams/)
-499.08
196.18
unitless
Lauren T. Toth
SOUTHEAST REGION: ST. PETE COASTAL & MARINE SC
Research Physical Scientist
mailing and physical
600 4Th Street South
St. Petersburg
FL
33701
US
727-502-8029
ltoth@usgs.gov
Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
comma-delimited text, Microsoft Excel format
https://coastal.er.usgs.gov/data-release/doi-P9OOL3L4/data/South_Florida_mangrove_peat_radiocarbon_data.zip
None
20220819
Lauren T. Toth
SOUTHEAST REGION: ST. PETE COASTAL & MARINE SC
Research Physical Scientist
mailing and physical
600 4Th Street South
St. Petersburg
FL
33701
US
727-502-8029
ltoth@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998