oxygen_isotope_seasonality: Function for oxygen isotope based seasonality...

In seasonalclumped: Toolbox for Clumped Isotope Seasonality Reconstructions

Description

Uses records of stable oxygen isotope ratios (δ18Oc) through subannually resolved carbonate archives (e.g. mollusk shells or corals) to reconstruct monthly variability in temperature and salinity (assuming user provided variability in δ18O composition of the precipitation fluid).

Usage

oxygen_isotope_seasonality(
  d18Oc,
  ages,
  SD_d18Oc = 0.1,
  d18Ow = 0,
  d18O_fun = "KimONeil97",
  export = FALSE
)

Arguments

d18Oc	Vector containing subannually resolved δ18Oc data
ages	Vector containing ages for of all samples in years relative to the shell chronology
SD_d18Oc	Error on the δ18Oc measurements. Either a single value (constant uncertainty) or a vector of length equal to the period in SST data (365 days by default) containing information about the error of each datapoint (1 standard deviation; default = 0.1 permille).
d18Ow	Vector containing δ18O values (in permille VSMOW) of the precipitation fluid used to calculate temperatures. If only a single value is provided, the δ18O of the fluid is presumed constant at this value. Default = 0 permille VSMOW.
d18O_fun	String containing the name of the transfer function used to convert temperature and δ18Ow to δ18Oc data (for example: "KimONeil97" or "GrossmanKu86"). Defaults to Kim and O'Neil (1997).
export	Export table summary of result (CSV format)? TRUE/FALSE

Value

A data frame containing monthly reconstructions of temperature, δ18O of the precipitation fluid and δ18Oc.

References

Grossman, E.L., Ku, T., Oxygen and carbon isotope fractionation in biogenic aragonite: temperature effects, Chemical Geology 1986, 59.1, 59–74. https://doi.org/bvpzws

Kim, S., O'Niel, J.R., Equilibrium and nonequilibrium oxygen isotope effects in synthetic carbonates, Geochimica et Cosmochimica Acta 1997, 61.16, 3461–3475. https://doi.org/c7bwbp

Dettman, D.L., Reische, A.K., Lohmann, K.C., Controls on the stable isotope composition of seasonal growth bands in aragonitic fresh–water bivalves (Unionidae), Geochimica et Cosmochimica Acta 1999, 63.7–8, 1049–1057. https://doi.org/cbb7zc

Brand, W.A., Coplen, T.B., Vogl, J., Rosner, M., Prohaska, T., Assessment of international reference materials for isotope–ratio analysis (IUPAC Technical Report), Pure and Applied Chemistry 2014, 86.3, 425–467. https://doi.org/fpc2

de Winter, N. J., Agterhuis, T., Ziegler, M., Optimizing sampling strategies in high–resolution paleoclimate records, Climate of the Past Discussions 2020, 1–52. https://doi.org/fpc4

Examples

# find attached dummy data
Case1 <- seasonalclumped::Case1
d18Oc <- Case1[, 29]
d18Oc <- d18Oc[-which(is.na(d18Oc))]
ages <- Case1[, 27]
ages <- ages[-which(is.na(ages))]
# Run function
monthly <- oxygen_isotope_seasonality(d18Oc,
ages,
0.1,
0,
"KimONeil97",
FALSE)

seasonalclumped documentation built on Jan. 16, 2021, 5:26 p.m.