OxCal > Calibration Curves

# Calibration Curves

- Atmospheric curves
- Marine curves

## Atmospheric Curves

The main curves recommended for calibration are:

- IntCal series
  - IntCal09: Northern Hemisphere (Reimer et al. 2009)
  - SHCal04: Southern Hemisphere (McCormac et al. 2004)
- Bomb series (Hua and Barbetti 2004)
  - Bomb04NH1: North of 40¡N; note this is prepended with the last 300 years of IntCal04
  - Bomb04NH2: Between 40¡N and mean summer intertropical convergence zone; note this is prepended with the last 300 years of IntCal04
  - Bomb04NH3: Northern hemisphere mean summer intertropical convergence zone; note this is prepended with the last 300 years of IntCal04
  - Bomb04SH: Southern hemisphere; note this is prepended with the last 300 years of SHCal04
- Kueppers04: Bomb series based on growth season (Kueppers et al. 2004)

For comparison with older calibrations the following are also included:

- IntCal04: Northern Hemisphere (Reimer et al. 2004)
- IntCal98 (Stuiver et al. 1998)

For post-bomb results the function R_F14C() should be used which uses results in the form of F14C as defined by Reimer et al. 2004. As a default OxCal works on a resolution of 0.2yr with such data. To obtain results similar to those for the non-smoothed curve in CALIBomb (Reimer et al. 2004), you should set the resolution to 0.01. For many purposes you should consider adding a Reservoir time constant in this time period as even short-lived plants grow over several months.

## Marine Curves

The recommended marine curve is:

- Marine09 - Modelled ocean average (Reimer et al. 2009)

For marine calibrations you will need to find an appropriate ΔR offset from the CHRONO Marine Reservoir Database.

For comparison with older calibrations the following are also included:

- Marine04 - Modelled ocean average (Hughen et al. 2004)
- Marine98 (Stuiver et al. 1998)