PoolDilutionR: Calculate Gross Biogeochemical Flux Rates from Isotope Pool
Dilution 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.
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