Description Usage Arguments Details Value Author(s) References Examples
This function fits a "Constant Flux Constant Sedimentation Rate" (CF:CS) model to 210Pb activity data from different soil depths to estimate the sedimentation rate of the profile.
1 2 | calc_SedimentationRate(x, reverse = TRUE, fix_a0 = FALSE,
verbose = TRUE, ...)
|
x |
| depth (cm )| activity (Bq/kg) | | [ ,1] | [ ,2] | |------------|------------------| [1, ]| ~~~~ | ~~~~ | [2, ]| ~~~~ | ~~~~ | ... | ... | ... | [x, ]| ~~~~ | ~~~~ | |
reverse |
|
fix_a0 |
|
verbose |
|
... |
Futher arguments passed to |
Model
y = a0 * exp((l/s) * x)
y
= 210Pb activity at depth x
(cm)
a0
= 210Pb activity at depth x=0
l
= 210Pb decay constant (= 0.03114 a-1)
s
= sedimentation rate (cm/a)
x
= depth below surface (cm)
A list
with the following structure:
Element | Data type | Description |
$summary | data.frame | summary table of important model results |
$data | data.frame | original input data |
$model | nls | model output generated by minpack.lm::nlsLM
|
Christoph Burow, University of Cologne
Szmytkiewicz, A., Zalewska, T., 2014. Sediment deposition and accumulation rates determined by sediment trap and 210Pb isotope methods in the Outer Puck Bay (Baltic Sea). Oceanologia 56(1), 85-106.
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