Sensing vegetation fluorescence from space: Analysis of 3-years of GOSAT data and the potential of the Orbiting Carbon Observatory-2 This talk will show the path of satellite remote sensing of solar induced chlorophyll fluorescence (SIF) using high-resolution near-infrared spectra obtained from the Japanese GOSAT satellite and provide an outlook of the potential of NASA’s Orbiting Carbon Observatory (OCO-2). Recent results from the analysis of 3 years of GOSAT data and its application for global carbon cycle research, esp. in conjunction with space-based CO2 measurements, will be summarized with a focus on recent findings for the Amazon basin, showing signs of water limitation for carbon uptake in parts of the tropical rainforest. Another aspect will cover a recent PNAS paper on crop productivity in the US corn belt. Further focus will be on sensitivity studies for the OCO-2 mission, providing performance estimates based on actual solar spectra recorded during Thermal Vacuum Tests at JPL as well as comprehensive sensitivity studies using the OCO-2 orbit simulator. Space-based observations of anomalous methane emissions: Four Corners The global atmospheric methane burden and its variable growth have proven difficult to explain. Even in North America we find a ~10 Tg CH4 gap between annual emissions estimated from the atmospheric observations (top-down) and from inventories (bottom-up). This talk will present methane observations made from space combined with earth-based remote sensing column measurements showing that the largest anomalous methane levels viewable from space over the conterminous US is located at the Four Corners region in the Southwest. Comparing high-resolution simulations with SCIAMACHY observations indicates emissions ~1/2 Tg CH4/yr have been emitted from this one region alone, persisting since the start of observations in 2003. This finding demonstrates that space-based observations of methane can be used to identify regions of anomalously large methane emissions, quantitatively inform emission rates, and guide ground-based follow-up studies.

Diese Veranstaltung ist Teil der Reihe Karlsruher Meteorologisches Kolloquium

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Referent/in
Dr. Christian Frankenberg

NASA/JPL

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