paleofire (version 1.1.8)

pfComposite: Produce a composite serie from multiple charcoal records

Description

Produce a composite serie from multiple charcoal records using bootstrap resampling, the sites charcoal values are binned and the mean in each bin is calculated prior the bootstrap procedure. This procedure is equivalent to Power et al. 2008.

Usage

pfComposite(TR, bins = NULL, nboot = 1000, binning = TRUE, conf = c(0.05, 0.95))

Arguments

TR

An object returned by pfTransform

bins

Numeric, the sequence for binning given in years (e.g. bins=seq(from=0, to=10000, by=200)). If unspecified the sequence is defined as bins=seq(from=min age, to=max age, by=median resolution).

nboot

Numeric, a number specifying the number of bootstrap replicates.

binning

Logical, set to TRUE (default) for binning, if transformed data are first interpolated this argument can be set to FALSE (no binning).

conf

Numeric, define confidence levels.

Value

Object of the class "pfComposite"

References

Power, M., J. Marlon, N. Ortiz, P. Bartlein, S. Harrison, F. Mayle, A. Ballouche, R. Bradshaw, C. Carcaillet, C. Cordova, S. Mooney, P. Moreno, I. Prentice, K. Thonicke, W. Tinner, C. Whitlock, Y. Zhang, Y. Zhao, A. Ali, R. Anderson, R. Beer, H. Behling, C. Briles, K. Brown, A. Brunelle, M. Bush, P. Camill, G. Chu, J. Clark, D. Colombaroli, S. Connor, A. L. Daniau, M. Daniels, J. Dodson, E. Doughty, M. Edwards, W. Finsinger, D. Foster, J. Frechette, M. J. Gaillard, D. Gavin, E. Gobet, S. Haberle, D. Hallett, P. Higuera, G. Hope, S. Horn, J. Inoue, P. Kaltenrieder, L. Kennedy, Z. Kong, C. Larsen, C. Long, J. Lynch, E. Lynch, M. McGlone, S. Meeks, S. Mensing, G. Meyer, T. Minckley, J. Mohr, D. Nelson, J. New, R. Newnham, R. Noti, W. Oswald, J. Pierce, P. Richard, C. Rowe, M. Sanchez Goni, B. Shuman, H. Takahara, J. Toney, C. Turney, D. Urrego-Sanchez, C. Umbanhowar, M. Vandergoes, B. Vanniere, E. Vescovi, M. Walsh, X. Wang, N. Williams, J. Wilmshurst, and J. Zhang. 2008. Changes in fire regimes since the Last Glacial Maximum: an assessment based on a global synthesis and analysis of charcoal data. Climate Dynamics 30:887-907.

Examples

## Composite charcoal record for North America:
ID=pfSiteSel(id_region=="WNA0" & l12==1)
plot(ID)
## Transform data
res3=pfTransform(ID,method=c("MinMax","Box-Cox","Z-Score"),BasePeriod=c(200,4000))

## Composite
comp=pfComposite(res3,bins=seq(from=0,to=12000,by=200))
plot(comp)