1. Compact Probe for In-Situ Optical Snow Grain Size Stratigraphy
Dan Berisford, Noah Molotch, Michael Durand, Thomas H. Painter

2. Traditional Grain Size Measurement
Hand lens grain size estimation

3. Radiative transfer from hand lens
Painter et al., Journal of Glaciology 2007

4. Traditional Grain Size Measurement
Reference!!!

5. Contact Spectroscopy Advantages Less subjective Repeatable Faster
Data applicable to remote sensing
Painter et al., Journal of Glaciology 2007

6. Contact Spectroscopy optical equivalent grain size
obtained by integrating absorption feature and comparing to RT model
Painter et al., 2007; Nolin and Dozier, 2000.

7. Spectral Profiler Probe
sleeve
reflectance
probe
drive tube
fiber
Send optics down bore hole
Lateral reflectance spectra
Fiber optic sends signal to surface
No snowpit!

8. fiber optic to spectrometer
drive tube
probe carrier body
spectral reflectance probe
optical inspection camera
aluminum sleeve with machined slits for lateral viewing
nylon brush

9. drive tube
fiber optic to spectrometer
thumb screw
clamp
base plate
aluminum sleeve section

10. Spectral Profiler Probe Hardware
fiber optic to spectrometer
base plate
aluminum sleeve
drive tube
reflectance probe
clamp

11. Spectral Profiler Probe Hardware
optical inspection camera
spectral reflectance probe
nylon brush
In-bore light source

12. on off 2 configurations In-bore fiber light light spectrometer
light source
light source on
off

13. Probe stowed for transport

14. Field Testing
spectrometer
tarp to block sunlight

15. Field testing

16. Niwot Ridge April 2010 results

17. Niwot Ridge April 2010 results

18. Storm Peak Lab Feb 2010 results

19. Future Work miniaturize probe add density measurement
algorithm for on-site grain size retreval
take measurements over large geographic area

20. Acknowledgements Alex Arnsten Jennifer Petrzelka
Part of this work was performed at the Jet Propulsion Laboratory/California Institute of Technology under contract from NASA.

21. supplemental