pdr_estimate_k0

Estimate initial k from heavy isotope concentration data

Pool dilution is a isotope tracer technique wherein a
biogeochemical pool is artifically enriched with its heavy isotopologue
and the gross productive and consumptive fluxes of that pool are
quantified by the change in pool size and isotopic composition over time.
This package calculates gross production and consumption rates from
closed-system isotopic pool dilution time series data. Pool size
concentrations and heavy isotope (e.g., 15N) content are measured over time
and the model optimizes production rate (P) and the first order rate
constant (k) by minimizing error in the model-predicted total pool size,
as well as the isotopic signature. The model optimizes rates by weighting
information against the signal:noise ratio of concentration and heavy-
isotope signatures using measurement precision as well as the magnitude of
change over time. The calculations used here are based on von Fischer and
Hedin (2002) <doi:10.1029/2001GB001448> with some modifications.

Kendalynn A. Morris

PoolDilutionR

Calculate Gross Biogeochemical Flux Rates from Isotope Pool
Dilution Data

Ben Bond-Lamberty

pdr_estimate_k0 function

<dl><dt>time</dt>
<dd>Vector of numeric time values (e.g. days); first should be zero</dd>
<dt>n</dt>
<dd>Observed heavy isotope (as a volume), same length as time</dd>
<dt>frac_k</dt>
<dd>Fractionation: 13C consumption as a fraction of 12C consumption</dd>
<dt>quiet</dt>
<dd>Suppress output message, logical</dd></dl>

Arguments

Estimate initial k from heavy isotope concentration data — pdr_estimate_k0

<dl>

<dt>time</dt>
<dd>Vector of numeric time values (e.g. days); first should be zero</dd>


<dt>n</dt>
<dd>Observed heavy isotope (as a volume), same length as time</dd>


<dt>frac_k</dt>
<dd>Fractionation: 13C consumption as a fraction of 12C consumption</dd>


<dt>quiet</dt>
<dd>Suppress output message, logical</dd>

</dl>

pdr_estimate_k0: Estimate initial k from heavy isotope concentration data

Description

Usage

Value

Arguments

Examples