Morris2023

Sequential measurements of methane concentration and isotopic signature were taken using a Picarro G2920 with a Small Sample Introduction module.
This instrument provides gas concentrations in ppm and signatures in delta-13C, here we provide those data converted into volume of methane and atom percent.

datasets

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

Morris2023 function

<dl>
 <dt>id</dt>
<dd>Sample ID, a factor</dd> <dt>time_days</dt>
<dd>time in days between measurements, starting at 0</dd> <dt>cal12CH4ml</dt>
<dd>ml of 12C-CH4 at each timestep</dd> <dt>cal13CH4ml</dt>
<dd>ml of 13C-CH4 at each timestep</dd> <dt>AP_obs</dt>
<dd>atom percent 13C-CH4 at each timestep</dd>
</dl>

Format

Example time series data from a methane dilution pool experiment. — Morris2023

<dl>
 <dt>id</dt>
<dd>Sample ID, a factor</dd>

 <dt>time_days</dt>
<dd>time in days between measurements, starting at 0</dd>

 <dt>cal12CH4ml</dt>
<dd>ml of 12C-CH4 at each timestep</dd>

 <dt>cal13CH4ml</dt>
<dd>ml of 13C-CH4 at each timestep</dd>

 <dt>AP_obs</dt>
<dd>atom percent 13C-CH4 at each timestep</dd>


</dl>

Morris2023: Example time series data from a methane dilution pool experiment.

Description

Usage

Arguments

Format