paleofire (version 1.2.4)

pretreatment: Calculate particules accumulation rates for sediment records

Description

This is the R version of the CharAnalysis CharPretreatment.m function originally develloped by P. Higuera and available at https://sites.google.com/site/charanalysis

Usage

pretreatment(
  params,
  serie,
  Int = TRUE,
  first = NULL,
  last = NULL,
  yrInterp = NULL
)

Arguments

params

A matrix with the following colums: CmTop, CmBot, AgeTop, AgeBot, Volume, in the same order.

serie

A proxy record to be transformed in accumulation rates, could be particule counts, surfaces, volumes, etc.

Int

Logical specifying whether the function interpolates missing values, default TRUE (missing values specified could be specified as -999 or NA)

first, last

Date of the first, last sample for accumulation rate calculation, if NULL first, last are automatically specified as the the minimum and maximum ages of the record respectively

yrInterp

Temporal resolution of the interpolated accumulation rates, if NULL, yrInterp is automatically specified as the median resolution of the record

Value

Return an output structure with the following:

cmI

interpolated depths

ybpI

interpolated ages

accI

accumulation rates

Examples

# NOT RUN {
# }
# NOT RUN {
# In this example we will use the charcoal record of the Lac du Loup from Blarquez et al. (2010).
# Blarquez, O., C. Carcaillet, B. Mourier, L. Bremond, and O. Radakovitch. 2010. Trees in the
# subalpine belt since 11 700 cal. BP: origin, expansion and alteration of the modern forest.
# The Holocene 20:139-146.

# Load raw charcoal data in mm^2
A=read.csv("http://blarquez.com/public/code/loupchar.csv")
C_=A[,6] # charcoal areas
P_=A[,1:5] # CmTop, CmBot, AgeTop, AgeBot, Volume

# Calculates charcoal accumulation rate (CHAR, mm2.cm-2.yr-1)
CHAR=pretreatment(params=P_,serie=C_,Int=TRUE)
plot(CHAR)
# }
# NOT RUN {
# }