Calculations for chlorophyll fluorescence incorporated into the Community Land Model

Thursday, 18 December 2014: 12:05 PM
Jung-Eun Lee, Brown University, Providence, RI, United States, Joseph A Berry, Carnegie Institution for Science, Stanford, CA, United States, Christiaan Van der Tol, ITC, Enschede, Netherlands, Luis Guanter, Free University of Berlin, Berlin, Germany, Alexander Damm, Universität Zürich, Zürich, Switzerland, Ian T Baker, Colorado State University, Atmospheric Sciences, Fort Collins, CO, United States and Christian Frankenberg, NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Several studies have shown that sun-induced fluorescence (SIF) is sensitive to photosynthesis rates, thus providing useful information for studying terrestrial gross primary production (GPP). Here, we have incorporated equations for SIF into a land surface model, the National Center for Atmospheric Research Community Land Model version 4 (NCAR CLM4), to better estimate terrestrial GPP. First, we use existing theory and data to explain how SIF was incorporated into CLM4.. We then demonstrate that our simulated fluorescence values are reasonable when compared with satellite (Greenhouse gases Observing SATellite; GOSAT) and in situ flux-tower measurements. Photosynthesis influences energy, water and carbon cycles, and we expect that the incorporation of SIF, along with satellite and in situ measurements, will improve estimates for GPP and thereby play a critical role in improving land surface models.