mixCurves {rcarbon}

Creates mixed calibration curves.

Description

Function for generating mixed calibration curves (e.g. intcal20/marine20, intcal20/shcal20) with user-defined proportions.

Usage

mixCurves(
  calCurve1 = "intcal20",
  calCurve2 = "marine20",
  p = 0.5,
  resOffsets = 0,
  resErrors = 0
)

Arguments

calCurve1

Name of the first curve, chosen from 'intcal20','intcal13','intcal13nhpine16','shcal20','shcal13','shcal13shkauri16',”marine13','marine20'. Default is 'intcal20'.

calCurve2

Name of the second curve, from the same list. Default is 'marine20'.

p

The proportion of contribution of the first curve. Default is 1.

resOffsets

Offset value for the marine reservoir effect to be applied to calCurve2. Default is 0.

resErrors

Error of the marine reservoir effect offset to be applied to calCurve2. Default is 0.

Details

The function is based on the mix.calibrationcurves function of the clam package.

Value

A three-column matrix containing calibrated year BP, uncalibrated age bp, and standard deviation. To be used as custom calibration curve for the calibrate function.

References

Blaauw, M. and Christen, J.A.. 2011. Flexible paleoclimate age-depth models using an autoregressive gamma process. Bayesian Analysis, 6, 457-474. Blaauw, M. 2018. clam: Classical Age-Depth Modelling of Cores from Deposits. R package version 2.3.1. https://CRAN.R-project.org/packacge=clam Marsh, E.J., Bruno, M.C., Fritz, S.C., Baker, P., Capriles, J.M. and Hastorf, C.A., 2018. IntCal, SHCal, or a Mixed Curve? Choosing a 14 C Calibration Curve for Archaeological and Paleoenvironmental Records from Tropical South America. Radiocarbon, 60(3), pp.925-940.

See Also

calibrate

Examples

myCurve <- mixCurves('intcal20','marine20',p=0.7,resOffsets=300,resErrors=20)
x <- calibrate(4000,30,calCurves=myCurve)