seasonalclumped (version 0.3.2)

oxygen_isotope_seasonality: Function for oxygen isotope based seasonality reconstructions.

Description

Uses records of stable oxygen isotope ratios (\(\delta^{18}O_{c}\)) through subannually resolved carbonate archives (e.g. mollusk shells or corals) to reconstruct monthly variability in temperature and salinity (assuming user provided variability in \(\delta^{18}O\) 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 \(\delta^{18}O_{c}\) data

ages

Vector containing ages for of all samples in years relative to the shell chronology

SD_d18Oc

Error on the \(\delta^{18}O_{c}\) 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 \(\delta^{18}O\) values (in permille VSMOW) of the precipitation fluid used to calculate temperatures. If only a single value is provided, the \(\delta^{18}O\) 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 \(\delta^{18}O_{w}\) to \(\delta^{18}O_{c}\) 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, \(\delta^{18}O\) of the precipitation fluid and \(\delta^{18}O_{c}\).

References

Grossman, E.L., Ku, T., Oxygen and carbon isotope fractionation in biogenic aragonite: temperature effects, Chemical Geology 1986, 59.1, 59<U+2013>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<U+2013>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<U+2013>water bivalves (Unionidae), Geochimica et Cosmochimica Acta 1999, 63.7<U+2013>8, 1049<U+2013>1057. https://doi.org/cbb7zc

Brand, W.A., Coplen, T.B., Vogl, J., Rosner, M., Prohaska, T., Assessment of international reference materials for isotope<U+2013>ratio analysis (IUPAC Technical Report), Pure and Applied Chemistry 2014, 86.3, 425<U+2013>467. https://doi.org/fpc2

de Winter, N. J., Agterhuis, T., Ziegler, M., Optimizing sampling strategies in high<U+2013>resolution paleoclimate records, Climate of the Past Discussions 2020, 1<U+2013>52. https://doi.org/fpc4

Examples

# NOT RUN {
# 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)
# }