Exact evaluation of gross photosynthetic production from the oxygen triple-isotope composition of O2: Implications for the net-to-gross primary production ratios

Maria G. Prokopenko, Olivier M. Pauluis, Julie Granger, Laurence Y. Yeung

Research output: Contribution to journalArticle

Abstract

The oxygen triple-isotope composition of dissolved O2 provides an integrative method to estimate the rates of Gross Photosynthetic Production (GPP) in the upper ocean, and combined with estimates of Net Community Production (NCP) yields an estimate of the net-to-gross (NCP/GPP) production ratios. However, derivations of GPP from oxygen triple-isotope measurements have involved some mathematical approximations. We derive an exact expression for calculating GPP, and show that small errors associated with approximations result in a relative error of up to ∼38% in GPP, and up to ∼50% in N/G. In open ocean regimes with low primary production, the observed magnitude of the error is comparable to the combined methodological uncertainties. In highly productive ecosystems, the error arising from approximations becomes significant. Using data collected on the Bering Sea shelf, we illustrate the differences in GPP estimates in both high and low productivity regimes that arise from exact and approximated formulations.

Original languageEnglish (US)
Article numberL14603
JournalGeophysical Research Letters
Volume38
Issue number14
DOIs
StatePublished - 2011

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primary production
isotopes
isotope
oxygen
evaluation
shelf sea
upper ocean
open ocean
productivity
ecosystem
estimates
oceans
Bering Sea
approximation
ecosystems
shelves
derivation
rate
method
formulations

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

Exact evaluation of gross photosynthetic production from the oxygen triple-isotope composition of O2 : Implications for the net-to-gross primary production ratios. / Prokopenko, Maria G.; Pauluis, Olivier M.; Granger, Julie; Yeung, Laurence Y.

In: Geophysical Research Letters, Vol. 38, No. 14, L14603, 2011.

Research output: Contribution to journalArticle

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