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

In rbacon: Age-Depth Modelling using Bayesian Statistics

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
)

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.

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.

Value

all MCMC estimates of accumulation rate of the chosen age.

Author(s)

Maarten Blaauw, J. Andres Christen

Examples

## Not run: 
  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)

## End(Not run)

rbacon documentation built on Sept. 30, 2024, 9:40 a.m.