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Converting isotope delta from VSMOW to VPDB

Source: R/vpdb.R
to_VPDB.Rd

to_VPDB() convert d18O value expressed on the VSMOW scale to the VPDB scale.

Usage

to_VPDB(d18O_VSMOW, eq = "IUPAC")

Arguments

d18O_VSMOW

d18O values expressed on the VSMOW scale (‰).

eq

Equation used for the conversion.

  • "IUPAC" (default): the IUPAC recommended equation listed in Brand et al. (2014) and Kim et al. (2015).

  • "Coplen83": the equation listed in Coplen et al. (1983) and the Hoefs book.

Value

Returns the d18O value expressed on the VPDB scale (‰).

Details

The IUPAC recommended equation to convert between the scales is:

$$\delta^{18}O_{VPDB} = 0.97001 \times \delta^{18}O_{VSMOW} - 29.99$$

References

References are listed at to_VSMOW().

See also

to_VSMOW() converts d18O values expressed on the VPDB scale to the VSMOW scale.

Examples

to_VPDB(0)
#> [1] -29.99
to_VPDB(0, eq = "Coplen83")
#> [1] -29.98