The impact of microbial carbonic anhydrase activity on atmospheric concentrations of CO18O and COS at large scales - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Conference Papers Year : 2017

The impact of microbial carbonic anhydrase activity on atmospheric concentrations of CO18O and COS at large scales

Abstract

Photosynthesis (GPP), the largest CO 2 flux from the land surface, i s currently estimated with considerable uncertainty between 100-175 Pg C yr -1 . More robust estimates of global GPP could be obtained from the atmospheric b udgets of other tracers such as, the oxygen isotopic composition (δ 18 O) of atmospheric CO 2 or carbonyl sulphide (COS). However, estimating GPP using thes e tracers hinges on a better understanding of how soil microbes modify th e atmospheric concentrations of CO 18 O and COS at large scales. In par ticular, understanding better the role and activity of the enzyme Carbonic Anhydrase (CA) in soil microbes is a critical factor u nderpinning the successful implementation of these tracers in global scale models. We addr essed this knowledge gap by measuring the exchange of CO 18 O and COS between soil microcosms and the atmosphere from over 60 sites covering a range of biome s across Europe and the USA. This novel dataset has led to the development of a new mechanistic framework that can be easily i mplemented in mult i-tracer Earth system models to predict variati ons in soil CA a ctivity across the terrestrial land surface. Using this multi-tracer approach we provi de independent estimates of globa l GPP constrained by the atmospheric budgets of CO 2 , CO 18 O and COS.
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Dates and versions

hal-02787886 , version 1 (05-06-2020)

Identifiers

  • HAL Id : hal-02787886 , version 1
  • PRODINRA : 439916

Cite

Matthias Cuntz, Lisa Wingate. The impact of microbial carbonic anhydrase activity on atmospheric concentrations of CO18O and COS at large scales. 10. International Carbon Dioxide Conference, Aug 2017, Interlaken, Switzerland. ⟨hal-02787886⟩
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