rbacon (version 3.3.1)

accrate.age: Obtain estimated accumulation rates for any age of a core.

Description

Obtain accumulation rates (in years per cm, so actually sedimentation times) as estimated by the MCMC iterations for any age of a core.

Usage

accrate.age(
  age,
  set = get("info"),
  cmyr = FALSE,
  ages = c(),
  BCAD = set$BCAD,
  silent = TRUE,
  na.rm = FALSE
)

Value

all MCMC estimates of accumulation rate of the chosen age.

Arguments

age

The age for which the accumulation rates need to be returned.

set

Detailed information of the current run, stored within this session's memory as variable info.

cmyr

Accumulation rates can be calculated in cm/year or year/cm. By default cmyr=FALSE and accumulation rates are calculated in year per cm.

ages

The ages of the age-depth model. Not provided by default, but can be provided to speed things up if the function is called repeatedly

BCAD

The calendar scale of graphs and age output-files is in cal BP by default, but can be changed to BC/AD using BCAD=TRUE.

silent

Warn when ages are outside the core's range. Default silent=TRUE.

na.rm

Remove NA entries. These are NOT removed by default, ensuring that always the same amount of iterations is returned.

Author

Maarten Blaauw, J. Andres Christen

Details

Considering accumulation rates is crucial for age-depth modelling, and even more so if they are subsequently used for calculating proxy influx values, or interpreted as proxy for environmental change such as carbon accumulation. See also accrate.age.ghost, accrate.depth and accrate.depth.ghost. Bacon deals explicitly with accumulation rate and its variability through defining prior distributions. This function obtains accumulation rates (in years per cm, so actually sedimentation times) as estimated by the MCMC iterations for any age of a core. Deals with only 1 age at a time. See also accrate.depth.

Examples

if (FALSE) {
  Bacon(run=FALSE, coredir=tempfile())
  agedepth(yr.res=50, d.res=50, d.by=10)
  accrate.a5000 <- accrate.age(5000)
  plot(accrate.a5000, pch='.')
  hist(accrate.a5000)
}