File | Contents | Reference |
---|---|---|
IntCal04.14c | Atmospheric data for the N Hemisphere | Reimer et al 2004 |
Marine04.14c | Marine data (requires local correction) | Hughen et al 2004 |
ShCal04.14c | Atmospheric data for the S Hemisphere | McCormac et al 2004 |
The default curve is the atmospheric N hemisphere curve intcal04.14c.
Previous versions of the calibration curve are also included: cal_86.dta (was called cal10.dta in older versions), cal_93.dta (was cal20.dta) and intcal98.14c
A post-bomb compilation is also included in kueppers04.14c see Kueppers et al 2004 for details. Because of the very fast rise in radiocarbon over this period a resolution of 0.1 years may work best - or consider whether a reservoir time constant should be applied - even if only of 1-2 years as this can make a significant difference.
This program will work with any data files intended for the CALIB (*.14c) or the Groningen program (*.dta).
The current IntCal datasets are based on a BP timescale and are comma delimited. This is recognised by the program by the presence of the CAL BP label in the header. The comment lines are started with a # and the comment included as a short reference starts with ##. The format is:
CAL BP, 14C age,Error,Delta 14C,SigmaPrevious versions of CALIB used a data format with five columns of numbers:
Calendar_date Delta_14C error 14C_Age errorwhereas the Groningen program uses a basic file format of:
Calendar_date 14C_Age errorThe program automatically detects the format. In addition to the calibration curve data itself the files can also be modified to provide the reference data on the top of the plots. Lines starting with the character " or the string ## are combined together to form the reference string.
Lines not starting with the reference character or which do not contain data in the right format are ignored.
For environments with a reservoir effect a special curve can be generated using Reservoir. Samples from the oceans should use a specific marine curve and Delta_R corrections.
In the Southern Hemisphere the ShCal.14c curve should be used.
See [Mathematical Methods]
See [Mathematical Methods]
Plot { Curve "intcal04" "C:\Program Files\OxCal3\intcal04.14c"; Curve "local_marine" "C:\Program Files\OxCal3\marine04.14c"; Delta_R 100 30; Mix_Curves "mixed" "intcal04" "local_marine" 20 5; R_Date 660 35; };See [Mathematical Methods]