B22E-04
The impact of Carbonic Anhydrase on the partitioning of leaf and soil CO18O and COS gas exchange across scales
Tuesday, 15 December 2015: 11:05
2006 (Moscone West)
Lisa Wingate1, Richard A Wehr2, Roisin Commane3, Jerome Ogee4, Joana Sauze4, Samuel Jones1, Thomas Launois1, Steven Wohl1, Mary Whelan5, Laura K Meredith6, Bernard Genty7, Teresa Gimeno1, Juergen Kesselmeier8, Alexandre Bosc9, Matthias Cuntz10, J William Munger3, David D Nelson11, Scott R Saleska2, Steven C Wofsy3 and Mark S Zahniser11, (1)INRA Bordeaux-Aquitaine, Villenave d'Ornon Cedex, France, (2)University of Arizona, Tucson, AZ, United States, (3)Harvard University, Cambridge, MA, United States, (4)INRA Institut National de la Recherche Agronomique, Paris Cedex 07, France, (5)University of California Merced, Merced, CA, United States, (6)Stanford University, Stanford, CA, United States, (7)Cnrs/CEA/Aix-Marseille University, UMR6191 BVME, Saint-Paul-lez-Durance, France, (8)Max Planck Institute for Chemistry, Mainz, Germany, (9)INRA Bordeaux-Aquitaine, Cestas-Gazinet, France, (10)Helmholtz Centre for Environmental Research UFZ Leipzig, Leipzig, Germany, (11)Aerodyne Research Inc., Billerica, MA, United States
Abstract:
Photosynthesis (GPP), the largest CO2 flux to the land surface, is currently estimated with considerable uncertainty at between 100-175 Pg C yr-1. More robust estimates of global GPP could be obtained from the atmospheric budgets of other valuable tracers, such as carbonyl sulfide (COS) or the oxygen isotopic composition (δ18O) of atmospheric CO2. However, quantifying GPP using these tracers hinges on a better understanding of how soil micro-organisms modify the atmospheric concentrations of CO18O and COS at large scales. In particular, understanding better the role and activity of the enzyme Carbonic Anhydrase (CA) in soil micro-organisms is critical. We present novel datasets and model simulations demonstrating the progress in the collection of multi-tracer field datasets and how a new generation of multi-tracer land surface models can provide valuable constraints on photosynthesis and respiration across scales.
