1. Compact Probe for In-Situ Optical Snow Grain Size Stratigraphy Daniel Berisford 1, Noah Molotch 1,2, Thomas H. Painter 1, Michael Durand 3 1.NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 2.INSTAAR, University of Colorado, Boulder, CO 3.The Ohio State University, Columbus, OH Presented at the American Geophysical Union fall meeting, San Francisco, CA. December 13, 2010

2. Traditional Grain Size Measurement Hand lens grain size estimation

3. Traditional Grain Size Measurement http://www.comet.ucar.edu/class/hydromet/09_Oct13_1999/docs/cline/comet_snowhydro/sld038.htm

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

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 Send optics down hole Lateral reflectance spectra Fiber optic sends signal to surface No snowpit! Much faster than pit methods probe carrier body drive tube optical camera spectral reflectance probe nylon brush aluminum sleeve fiber optic to spectrometer

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

9. fiber optic to spectrometer base plate aluminum sleeve drive tube reflectance probe clamp

10. 2 configurations fiber light In-bore light

11. Field Testing probe stowed for transport Niwot Ridge, CO Storm Peak Lab, Steamboat Springs, CO

12. Niwot Ridge April 2010 results

13. Storm Peak Lab Feb 2010 results

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

15. Acknowledgements Jennifer Petrzelka Ty Atkins Alex Arnsten Ian McCubbin (Storm Peak Lab) Gannet Hallar (Storm Peak Lab) Part of this work was performed at the Jet Propulsion Laboratory/California Institute of Technology under contract from NASA.

16. Compact Probe for In-Situ Optical Snow Grain Size Stratigraphy Daniel Berisford 1, Noah Molotch 1,2, Thomas H. Painter 1, Michael Durand 3 1.NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 2.INSTAAR, University of Colorado, Boulder, CO 3.The Ohio State University, Columbus, OH Presented at the American Geophysical Union fall meeting, San Francisco, CA. December 13, 2010

17. supplemental

18. Field Testing tarp to block sunlight spectrometer

19. Field testing

22. Aluminum reflectance spectrum

23. Kapton tape reflectance spectrum