1st Seminar: Ground-based Measurement and Modeling of Solar-Induced Fluorescence in Japan (Dr. Tomomichi Kato)
Strong representation of Solar-Induced Fluorescence (SIF) for the ecosystem-level photosynthesis activity has been confirmed by satellite studies [Joiner et al., 2013; Frankenberg et al., 2011 etc.] and by field studies [Porcar-Castell, 2011, Yang et al., 2015]. To examine the further potential of SIF, the ground-based SIF emissions were calculated from long-term spectrum data of Phenological Eyes Network (PEN) and compared to eddy-GPP at 5 sites in Japan. Moreover, the effort for developing the combined modeling of single-leaf photosynthesis and 3D radiative transfer has started recently. I will introduce the preliminary results and overview of ground-based and modeling SIF studies by Japanese community.
2nd Seminar: On-going challenges and future perspective of SIF monitoring by GOSAT and GOSAT-2 (Dr. Hibiki Noda)
Atmospheric concentrations of greenhouse gasses, such as CO2 and CH4 have increased due to human activities, such as fossil funeral burning and land use change, and this increase is the main driving cause of climate change in global scale. To deal with the issue, it is necessary to monitor the spatial distribution and temporal dynamics of GHGs concentrations and their emission and sequestration with underlying mechanisms. On January 2009, to monitor atmospheric CO2 and CH4 in global scale, Ministry of the Environment of Japan, Japan Aerospace Exploration Agency (JAXA) and National Institute of Environmental Studies (NIES) launched Greenhouse Gases Observing Satellite (GOSAT).
Although TANSO-FTS, the sensor on GOSAT was designed for gas measurement, Joiner et al. (2011) and Frankenberg et al. (2011) have suggested that TANSO-FTS could detect overlapping part of solar-induced chlorophyll fluorescence (SIF) emitted by terrestrial vegetation and Fraunhofer lines. The chlorophyll fluorescence is weak radiation that emitted by chlorophyll in the photosynthetic process, and in plant ecophysiology it has been a biophysical index to examine the photosynthetic responses to environmental stresses such as extreme temperatures and drought.
In recent years, SIF is drawn considerable attention as a new technique to evaluate CO2 uptake function of terrestrial ecosystem, which is large carbon sink, uptakes 31 % of anthropogenic CO2 through photosynthesis by plants. In this talk, I will present our on-going and future challenges by GOSAT and GOSAT-2 to observe such photosynthetic activity of terrestrial ecosystems and its possible consequences with the atmospheric CO2 concentration from national, continental to global scales under climate change.
Dr. Tomomichi Kato and Dr. Hibiki Noda will be visiting the Biospheric Sciences Lab the week of February 27th to discuss the use of SIF in carbon cycle studies. Dr. Kato is an Assistant Professor in the Research Faculty of Agriculture at Hokkaido University, Japan. Dr. Noda is a Research Scientist at the Center for Global Environmental Research（Satellite Remote Sensing Section) at the National Institute for Environmental Studies (NIES), Japan. They will both give brief 20 minute talk on their work during the Biospheric Sciences seminar.