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ShellChron  

Builds Chronologies from Oxygen Isotope Profiles in Shells
View on CRAN: Click here


Download and install ShellChron package within the R console
Install from CRAN:
install.packages("ShellChron")

Install from Github:
library("remotes")
install_github("cran/ShellChron")

Install by package version:
library("remotes")
install_version("ShellChron", "0.4.0")



Attach the package and use:
library("ShellChron")
Maintained by
Niels de Winter
[Scholar Profile | Author Map]
First Published: 2020-11-20
Latest Update: 2021-07-05
Description:
Takes as input a stable oxygen isotope (d18O) profile measured in growth direction (D) through a shell + uncertainties in both variables (d18O_err & D_err). It then models the seasonality in the d18O record by fitting a combination of a growth and temperature sine wave to year-length chunks of the data (see Judd et al., (2018) ). This modeling is carried out along a sliding window through the data and yields estimates of the day of the year (Julian Day) and local growth rate for each data point. Uncertainties in both modeling routine and the data itself are propagated and pooled to obtain a confidence envelope around the age of each data point in the shell. The end result is a shell chronology consisting of estimated ages of shell formation relative to the annual cycle with their uncertainties. All formulae in the package serve this purpose, but the user can customize the model (e.g. number of days in a year and the mineralogy of the shell carbonate) through input parameters.
How to cite:
Niels de Winter (2020). ShellChron: Builds Chronologies from Oxygen Isotope Profiles in Shells. R package version 0.4.0, https://cran.r-project.org/web/packages/ShellChron. Accessed 18 Apr. 2025.
Previous versions and publish date:
0.2.8 (2020-11-20 10:40)
Other packages that cited ShellChron R package
View ShellChron citation profile
Other R packages that ShellChron depends, imports, suggests or enhances
Complete documentation for ShellChron
Functions, R codes and Examples using the ShellChron R package
Some associated functions: Virtual_shell . age_corr . cumdy . cumulative_day . d18O_model . data_import . export_results . growth_model . growth_rate_curve . mc_err_form . mc_err_orth . mc_err_proj . peakid . pipe . run_model . sd_wt . sinreg . temperature_curve . wrap_function . 
Some associated R codes: utils-pipe.R .  Full ShellChron package functions and examples
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