A clumped isotope temperature calibration of the form:
$$y = a \times 10^6 / T^2 + b$$,
where T is in Kelvin.

```
tempcal(
Tc,
slope = 0.0449,
intercept = 0.167,
slpcnf = 0.001,
intcnf = 0.01,
ignorecnf = FALSE
)
```

## Arguments

- Tc
The temperature in \(^{\circ}\)C.

- slope
The slope of the regression.

- intercept
The intercept of the regression.

- slpcnf
The confidence of the slope of the regression.

- intcnf
The confidence of the intercept of the regression.

- ignorecnf
Whether or not to ignore the confidence of the temperature
calibration.

## Value

A tibble with input Tc and estimated
\(\Delta_47\) value with lower and upper bounds.

## Details

Defaults to Bonifacie et al. 2017
$$\Delta_47 = (0.0449 \pm 0.001 \times 10^6) / T^2 + (0.167 \pm 0.01)$$

## References

M. Bonifacie, D. Calmels, J. M. Eiler, J. Horita, C. Chaduteau,
C. Vasconcelos, P. Agrinier, A. Katz, B. H. Passey, J. M. Ferry, J.
Bourrand. Calibration of the dolomite clumped isotope thermometer from 25
to 350 \(^\circ\)C, and implications for a universal calibration for all (Ca, Mg,
Fe)CO\({}_3\) carbonates. **2017**, *200*, 255–279.