Copy one of the calibration curves into memory.
ccurve(
cc = 1,
postbomb = FALSE,
cc.dir = NULL,
resample = 0,
glue = FALSE,
as.F = FALSE,
as.D = FALSE,
decimals = 8
)The calibration curve (invisible).
Calibration curve for 14C dates: cc=1 for IntCal20 (northern hemisphere terrestrial), cc=2 for Marine20 (marine),
cc=3 for SHCal20 (southern hemisphere terrestrial). Alternatively, one can also write, e.g., "IntCal20", "Marine13". One can also make a custom-built calibration curve, e.g. using mix.ccurves(), and load this using cc=4. In this case, it is recommended to place the custom calibration curve in its own directory, using cc.dir (see below).
Use postbomb=TRUE to get a postbomb calibration curve (default postbomb=FALSE). For monthly data, type e.g. ccurve("sh1-2_monthly")
Directory of the calibration curves. Defaults to where the package's files are stored (system.file), but can be set to, e.g., cc.dir="ccurves".
The IntCal curves come at a range of 'bin sizes'; every year from 0 to 5 kcal BP, then every 5 yr until 15 kcal BP, then every 10 yr until 25 kcal BP, and every 20 year thereafter. The curves can be resampled to constant bin sizes, e.g. resample=5. Defaults to FALSE.
If a postbomb curve is requested, it can be 'glued' to the pre-bomb curve. This feature is currently disabled - please use glue.ccurves instead
Return the F values, calculated from the C14 ages (columns 2 and 3). Defaults to as.F=FALSE.
If loading a curve that contains 2 additional columns containing the D14C values, then these can be returned instead of the curve's C14 ages and errors. Defaults to as.D=FALSE.
Number of decimals to report when as.F=TRUE. Defaults to 8.
Copy the radiocarbon calibration curve defined by cc into memory.
Hammer and Levin 2017, "Monthly mean atmospheric D14CO2 at Jungfraujoch and Schauinsland from 1986 to 2016", heiDATA: Heidelberg Research Data Repository V2 tools:::Rd_expr_doi("10.11588/data/10100")
Heaton et al. 2020 Marine20-the marine radiocarbon age calibration curve (0-55,000 cal BP). Radiocarbon 62, 779-820, tools:::Rd_expr_doi("10.1017/RDC.2020.68")
Hogg et al. 2013 SHCal13 Southern Hemisphere Calibration, 0-50,000 Years cal BP. Radiocarbon 55, 1889-1903, tools:::Rd_expr_doi("10.2458/azu_js_rc.55.16783")
Hogg et al. 2020 SHCal20 Southern Hemisphere calibration, 0-55,000 years cal BP. Radiocarbon 62, 759-778, tools:::Rd_expr_doi("10.1017/RDC.2020.59")
Hua et al. 2013 Atmospheric radiocarbon for the period 1950-2010. Radiocarbon 55(4), tools:::Rd_expr_doi("10.2458/azu_js_rc.v55i2.16177")
Hua et al. 2022 Atmospheric radiocarbon for the period 1950-2019. Radiocarbon 64(4), 723-745, tools:::Rd_expr_doi("10.1017/RDC.2021.95")
Levin and Kromer 2004 The tropospheric 14CO2 level in mid latitudes of the Northern Hemisphere. Radiocarbon 46, 1261-1272
Reimer et al. 2004 IntCal04 terrestrial radiocarbon age calibration, 0-26 cal kyr BP. Radiocarbon 46, 1029-1058, tools:::Rd_expr_doi("10.1017/S0033822200032999")
Reimer et al. 2009 IntCal09 and Marine09 radiocarbon age calibration curves, 0-50,000 years cal BP. Radiocarbon 51, 1111-1150, tools:::Rd_expr_doi("10.1017/S0033822200034202")
Reimer et al. 2013 IntCal13 and Marine13 radiocarbon age calibration curves 0-50,000 years cal BP. Radiocarbon 55, 1869-1887, tools:::Rd_expr_doi("10.2458/azu_js_rc.55.16947")
Reimer et al. 2020 The IntCal20 Northern Hemisphere radiocarbon age calibration curve (0-55 cal kBP). Radiocarbon 62, 725-757, tools:::Rd_expr_doi("10.1017/RDC.2020.41")
Stuiver et al. 1998 INTCAL98 radiocarbon age calibration, 24,000-0 cal BP. Radiocarbon 40, 1041-1083, tools:::Rd_expr_doi("10.1017/S0033822200019123")
van der Plicht et al. 2004. NotCal04—Comparison/Calibration 14C Records 26–50 Cal Kyr BP. Radiocarbon 46, 1225-1238, tools:::Rd_expr_doi("10.1017/S0033822200033117")
intcal20 <- ccurve(1)
marine20 <- ccurve(2)
shcal20 <- ccurve(3)
marine98 <- ccurve("Marine98")
pb.sh3 <- ccurve("sh3")
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