2015 Technical Development Progress Update Program: Photo-Spec: Comprehensive Ground-Based Studies of SolarInduced Chlorophyll Fluorescence - tracking seasonal, diurnal and fine spatial variability Campus PI: JPL PI: Paul Wennberg Christian Frankenberg Co-Investigators: Jochen Stutz, Ulli Seibt (UCLA) Debra Wunch (Caltech) Stanley Sander, Darren Drewry, Josh Fisher (JPL) Joe Berry (Carnegie) Gretchen Keppel Aleks (U. of Michigan) Brief summary of progress to date The project is only in the first half of the first year, so most progress is still in its infancy. However, we have been able to leverage ongoing efforts at UCLA and JPL to advance the spectrometer prototype design considerably. We adapted a measurement system at UCLA that is typically used for Max-DOAS observations to record high resolution and signal-to-noise ratio spectra within the spectra range where chlorophyll fluorescence takes place. For this purpose, we used an existing Ocean Optics QE Pro spectrometer contributed by JPL to advance the prototype design without early procurements. We found that the prototype system provided the require stability, spectral resolution as well as signal-to-noise ratio and will now design a fully functional prototype, led by UCLA co-I Jochen Stutz. The tentative prototype also allowed us to test the UCLA software with the latest version of the OO spectrometer systems, which can control stepper motors, spectrometer exposures and temperature control. At JPL, we developed software to convert the proprietary data format into standard HDF5 files that can be easily shared. The implementation of the SCOPE fluorescence model into the ML-Can vegetation model also started, led by co-I Darren Drewry. Spectrometer prototype testing at UCLA. Status of Collaborations (Campus/JPL/External) The first year of this project mainly consists of the design of the spectrometer system, hence mainly involving UCLA, JPL and Caltech. Two visits to UCLA (Paul Wennberg, Christian Frankenberg and Darren Drewry) kick-started the early prototype design by providing a JPL-owned OO QE Pro spectrometer to Jochen Stutz to test the most important aspects of the envisioned final design. In the current phase of the project, we have not been burdening co-Is not involved in the hardware development with regular team meetings, but rather rely on direct one-on-one conversations with the development team on specific aspects of the design as it is maturing. We have communicated with the partners on the system requirements to make sure that the design will meet their needs. More general communications between all team members will start once the spectrometer systems are assembled and ready for use by all co-Is.
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