FloX: A System for Automatic Long Term Measurements of Top of Canopy Sun Induced Chlorophyll Fluorescence

Transcription

1 FloX: A System for Automatic Long Term Measurements of Top of Canopy Sun Induced Chlorophyll Fluorescence Julitta, Tommaso; Burkart, Andreas; Rossini, Micol; Schickling, Anke; Colombo, Roberto; Rascher, Uwe; Cogliati, Sergio; Migliavacca, Mirco

2 Meroni et al Cogliati et al ESA-CEFLES2 ESA-SEN3EXP ESA-SEN2EXP ESA- SOYFLEX ESA-fluorecence ESA-HyFLEX Rossini et al ESA-FLEXEU Rossini et al. 2015

3 FloX (FLuorescence box) FloX is an automated field spectroscopy device capable of collecting unattended, continuous, long-term hyperspectral measurements. FloX is specifically designed to passively measure Chlorophyll fluorescence induced by sun, under natural light conditions. Spectrometer FWHM (nm) Sampling interval (nm) Spectral range (nm) Application Spec Sun-induced Chl fluorescence at O 2 -B and O 2 -A Spec 2 (optional) Irradiance, Radiance, Reflectance and VIs

4 TECHNICAL DETAILS

5 FLEX mission and FLORIS requirements FloX matches the technical requirements of FLORIS. Report for mission selection:

6 How does the FloX work? Single Beam System Measurement cycle Optimization of upward channel Optimization of downward channel Collection of upward channel Collection of downward channel Collection of upward channel Collection of Dark Current upward Collection of Dark Current downward

7 How does the FloX work? Single Beam System Measurement cycle Optimization of upward channel Optimization of downward channel Collection of upward channel Collection of downward channel Collection of upward channel Collection of Dark Current upward Collection of Dark Current downward

8 How does the FloX work? Single Beam System Measurement cycle Optimization of upward channel Optimization of downward channel Collection of upward channel Collection of downward channel Collection of upward channel Collection of Dark Current upward Collection of Dark Current downward

9 How does the FloX work? Single Beam System Measurement cycle Optimization of upward channel Optimization of downward channel Collection of upward channel Collection of downward channel Collection of upward channel Collection of Dark Current upward In order to guarantee high quality data the system is thermoregulated with an active CCD cooling. Collection of Dark Current downward

10 ADDITIONAL INFO Operational Simultaneous metadata Display Automatic crosscalibration Data storage Data transmission Dimension Power supply Energy saver Dust protection Spectrometer temperature, Internal temperature and humidity, GPS position, GPS time Live assessment of the systems status including real time SIF estimates Automatic calibratrion of upward and downward channel SD card up to 64 GB (12 months of measurements) Wireless data transmission Small form factor (50 x 30 x 20 cm) 12 Volt. From battery and solar panels, average of 60 Watt. Day/night switch for energy saving Active dust protection for Cosine Receptors

11 DATA PROCESSING R packages: FieldspectroscopyCC and FiledspectroscopyDP License: Open Source Calibration and charaterization of the systems used Signal to Noise Ratio Wavelength characterization and calibration Radiometric calibration Data processing: Calculate reflectance Vegetation Indices reflectance based SIF retrieval

12 ACTIVE REFERENCE How to check the uncertainty and the stability of the retrieval?

13 ACTIVE REFERENCE How to check the uncertainty and the stability of the retrieval? LED off LED + LED ++ LED +++ LED ++++ The active reference is calibrated to mimic the fluorescence emission of a plant. Both peaks are tuneable to different emission intensities.

14 ACTIVE REFERENCE Lab vs. field measurements Results confirm the possibility of using the active system as reference

15 ACTIVE REFERENCE An active reference is the missing key for comparing fluorescence measurements from different groups and devices.

16 Recent FIELD EXPERIMENTS

17 FloX in the Field MAJADAS - SPAIN - December 2016 Permanent installation in December Site Mediterranean savanna Ecosystem: oak trees (Quercus Ilex), and herbaceous species. Set up Automatic rotating arm allows the measurment of the two spots. Objectives Seasonal dynamics of fluorescence

18 UDINE - ITALY June 2016 ESA SoyFlex campaign 2 variety of soybean Wild type Minn Gold Parameter Wild Minn Gold Canopy heigh (cm) fapar (%) LAI 10 8 Total Chl (ug cm -2 ) 48 13

19 FloX in the Field Milano - Italy MILANO - ITALY January 2017 FloX under frozen conditions

20 THANKS FOR YOUR ATTENTION www-jb-hyperspectral.com

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22 live SIF estimate

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