terms and units of the k parameter in P_Sequences

[Erik Marsh]

Hi everyone – I have a follow up to my last question.

I'm trying to understand the three terms of the k parameter for P_Sequences, using the example from the manual. Units are in cm. I think I understand the first two parameters (do correct me) but not the third.

P_Sequence("variable k",1,2,U(-2,2))

1. Nominal value (k0) =1. Nominally, we assume there is 1 depositional event per cm.

2. Interpolation rate = 2. The models interpolates 2 events per cm (more events may plot better but increases processing time).
3. k distribution = U(-2,2). This varies from -2 to 2. But is this -2 events/cm (1 event per 2 cm) to 2 events/cm? What are the units here?

If I have an independently defined sedimentation rate of 1 cm every 100±10 years, how do I input that?

Thanks! – Erik

[Christopher Ramsey]

Dear Erik

This is explained in the relevant paper:

https://doi.org/10.1017/S0033822200057878

and the original P_Sequence paper:

http://dx.doi.org/10.1016/j.quascirev.2007.01.019

The third element is a logarithmic multiplier - so the range -2 to 2 implies that k is allowed to vary from 0.01 to 100 - a huge range which should cover all likely real situations.

Best wishes

Christopher

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[Erik Marsh]

Thanks Christopher! I will go back and take another look at those papers. -Erik