Solar-induced chlorophyll fluorescence is a powerful proxy for assessing biomass photosynthetic activity since part of the energy absorbed by Chlorophyll is dissipated by fluorescence. The Japanese GOSAT satellite is the first to provide high spectral resolution in the O2 A-band and thereby allows for quantification of fluorescence using Fraunhofer lines in the 755-775 nm range. We will a) present our retrieval method based on Fraunhofer lines and b) discuss the potential impact on XCO2 retrievals. The retrieval method has been applied to GOSAT data, providing global maps of chlorophyll fluorescence, clearly correlating with photosynthetic activity. On the global scale, tropical regions are most pronounced but show little seasonal variability. The seasonal cycle of biomass activity in the northern hemisphere can be clearly detected. We will discuss the annual average and seasonal variability of retrieved fluorescence and compare with other methods to derive photosynthetic activity (such as NDVI or model GPP).

Diese Veranstaltung ist Teil der Reihe Karlsruher Meteorologisches Kolloquium

Referent/in
Dr. Christian Frankenberg

California Institute of Technology, Pasadena, USA
Jet Propulsion Laboratory

Veranstalter
Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Karlsruher Institut für Technologie (KIT)
Kreuzeckbahnstraße 19
82467 Garmisch-Partenkirchen
E-Mail: hape schmid ∂does-not-exist.imk kit edu

Zielgruppe
Wissenschaftliche Mitarbeitende