Workshop Overview:
Our ability to close the Earth’s carbon budget and predict feedbacks in a warming climate depends critically on knowing where, when and how carbon dioxide (CO2) is exchanged between the land and atmosphere. A new generation of satellite missions such as GOSAT and OCO-2 aim at retrieving column-averaged mixing ratios of atmospheric CO2 with sufficiently high accuracy and precision to enable inversions of land-atmosphere CO2 fluxes (so called top-down approach), greatly reducing uncertainties in biospheric net fluxes. However, a complementary bottom-up approach is needed to understand how biological processes control this net flux. For example, both the magnitude and its seasonality of photosynthesis (commonly referred to as GPP) are uncertain, and we currently have no direct means of assessing this flux.
The focus of this workshop is on a newly developed capacity to monitor chlorophyll fluorescence from terrestrial vegetation by satellite. This new retrieval promises to provide direct and spatially resolved information on GPP, an ideal bottom-up complement to the atmospheric net CO2 exchange inversions. Sunlight absorbed by chlorophyll in photosynthetic organisms is mostly used to drive photosynthesis, but some can also be dissipated as heat or re-radiated at longer wavelengths (660-800 nm). This re-emitted light is termed solar-induced chlorophyll fluorescence (Fs) and has been found to strongly correlate with GPP.
We will leverage our efforts on previous studies and workshops related to the ESA Earth Explorer FLEX mission concept. These studies, mostly focused on canopy and leaf-level interpretation, will provide the ground-work for our workshop, which will be focused on the global carbon cycle and synergies with atmospheric net flux inversions. Our primary goal is thus to advance our understanding of Fs and its relation to GPP and environmental stress at the planetary scale.
Team Leads
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Caltech
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Jet Propulsion Laboratory
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Joseph Berry
Carnegie/Stanford
- Ian Baker — Colorado State University
- Joseph Berry — Carnegie Institution for Science
- Kevin Bowman — JPL
- Saulo Castro-Contreras — University of Alberta
- Maria Pilar Cendrero-Mateo — University of Arizona
- Alexander Damm — University of Zurich
- Darren Drewry — JPL
- Bethany Ehlmann — Caltech
- Joshua Fisher — JPL
- Jaume Flexas — Universitat de les Illes Balears
- Christian Frankenberg — JPL
- John Gamon — University of Alberta
- Bernard Genty — CNRS CEA Cadarache
- Luis Guanter — University of Oxford
- Thomas Hilker — Oregon State University
- Le (Elva) Kuai — JPL
- Joanna Joiner — NASA Goddard Space Flight Center
- Martin Jung — Max Planck Institute for Biogeochemistry
- Jung-Eun Lee — JPL
- Junjie Liu — JPL
- Anna Michalak — Carnegie/Stanford
- Charles Miller — JPL
- Christopher O'Dell — Colorado State University
- Nicholas Parazoo — JPL
- Albert Porcar-Castell — University of Helsinki
- Christopher Schwalm — Northern Arizona University
- Christian Van der Tol — ITC-University of Twente
- Paul Wennberg — Caltech
- Debra Wunch — Caltech
Presentations
| Speaker | Affiliation | Presentation |
|---|---|---|
| Ian Baker | Colorado State University | The Global Carbon Cycle (38 MB .pdf) |
| Joe Berry | Carnegie Institution for Sciences, Stanford | A Primer into Photosynthesis and Chlorophyll Fluorescence (16.8 MB .pdf) |
| Christian Frankenberg | JPL | Retrieval of Chlorophyll Fluorescence from Space (50.4 MB .pdf) |
| Team Leads | Workshop Goals and Objectives (84 KB .jpg) |
|
| Bernard Genty | CNRS CEA Cadarache | The Basic Relationships Between Chlorophyll Fluorescence and Photosynthesis in Plants (6.55 MB .pdf) |
| Joanna Joiner | NASA GSFC | Challenges in Retrieving and Using Space-Based Fluorescence (900 KB .pdf) |
| Luis Guanter | Free University Berlin | USARecap of Fluorescence Retrieval Techniques from Ground and Space (I/II) (1.3 MB .pdf) |
| Alexander Damm | University of Zurich | Fluorescence: Lessons Learned from Ground-Based and Airborne Studies (7 MB .pdf) |
| Jaume Flexas | University of Zurich | Stress Responses of Terrestrial Vegetation and Their Manifestation in Fluorescence and GPP (1.6 MB .pdf) |
| Martin Jung | Max Planck Institute for Biogeochemistry | Statistical Modelling (Upscaling) of Gross Primary Production (GPP) (6 MB .pdf) |
| Christiaan van der Tol | ITC-University of Twente | Scaling Flourescence from Leaf to CanopyScaling Flourescence from Leaf to Canopy (996 KB .pdf) |
| J. Albert Porcar-Castell | Univeristy of Helsinki | From Leaf-Level Flourescence to Regional GPP: Open Questions and Challenges (856 KB .pdf) |
| Ian Baker | Colorado State University | How Can We Exploit Fluorescence Simulations and Retrievals? (2.4 MB .pdf) |
| Paul Wennberg | Caltech | Determining Fluxes of CO2 using Mass Constraints (3.5 MB .pdf) |
| Thomas Hilker | Oregon State University | Improved Estimates of Vegetation Carbon Cycle Components (4.9 MB .pdf) |
| Anna Michalak | Carnegie Institution for Sciences, Stanford | A Bird's Eye View of the Carbon Cycle (9 MB .pdf) |
| Luis Guanter | Free University Berlin | What others observations are needed in addition to Fs for a Fobust GPP estimate? (1.3 MB .pdf) |
| Nick Parazoo | JPL | Complementary Estimates of Carbon Pools from Fs and CO2 (11.5 MB .pdf) |
