Presentation Title

Angular Dependence of Solar Induced Chlorophyll Fluorescence

Faculty Mentor

Jochen Stutz

Start Date

17-11-2018 12:30 PM

End Date

17-11-2018 2:30 PM

Location

HARBESON 27

Session

POSTER 2

Type of Presentation

Poster

Subject Area

biological_agricultural_sciences

Abstract

Photosynthetic activity provides crucial information about photosynthesis and carbon dioxide exchange of biospheres, but methods to observe it on an ecosystem or global scale are sparse. Solar induced chlorophyll fluorescence (SIF) is a novel remote-sensing method to monitor photosynthetic activity from local to global scales. In addition to satellite-retrieved SIF measurements, exploring SIF measurements on intermediate scales help understand biosphere dynamics and processes on smaller scales to determine how different biomes react to climate change. SIF quantifies the fluorescence emitted during photosynthesis using solar absorption lines in the red and far-red wavelength range. SIF is modulated by plant biochemistry, the diurnal cycle, the ratio of direct-to-diffuse solar radiation, the incident angle, and curvature of leaves. Surprisingly, there are no published studies on the angular characteristics of SIF. This study therefore aims to quantify the angular distribution of SIF through measurements on single banana leaves, to better understand SIF from more complex canopies, such as agricultural fields, and tropical and boreal forests. An opto-mechanical setup was developed to probe SIF and to measure three vegetation indices at different viewing angles. Initial tests showed that leaf position and placement impacts the angular distribution of SIF and vegetation indices. In addition, SIF emissions may be distributed differently depending on plant species when observing SIF and vegetation indices from an optical setup.

Summary of research results to be presented

Initial tests showed that leaf position and placement impacts the angular distribution of SIF and vegetation indices. In addition, SIF emissions may be distributed differently depending on plant species when observing SIF and vegetation indices from an optical setup.

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Nov 17th, 12:30 PM Nov 17th, 2:30 PM

Angular Dependence of Solar Induced Chlorophyll Fluorescence

HARBESON 27

Photosynthetic activity provides crucial information about photosynthesis and carbon dioxide exchange of biospheres, but methods to observe it on an ecosystem or global scale are sparse. Solar induced chlorophyll fluorescence (SIF) is a novel remote-sensing method to monitor photosynthetic activity from local to global scales. In addition to satellite-retrieved SIF measurements, exploring SIF measurements on intermediate scales help understand biosphere dynamics and processes on smaller scales to determine how different biomes react to climate change. SIF quantifies the fluorescence emitted during photosynthesis using solar absorption lines in the red and far-red wavelength range. SIF is modulated by plant biochemistry, the diurnal cycle, the ratio of direct-to-diffuse solar radiation, the incident angle, and curvature of leaves. Surprisingly, there are no published studies on the angular characteristics of SIF. This study therefore aims to quantify the angular distribution of SIF through measurements on single banana leaves, to better understand SIF from more complex canopies, such as agricultural fields, and tropical and boreal forests. An opto-mechanical setup was developed to probe SIF and to measure three vegetation indices at different viewing angles. Initial tests showed that leaf position and placement impacts the angular distribution of SIF and vegetation indices. In addition, SIF emissions may be distributed differently depending on plant species when observing SIF and vegetation indices from an optical setup.