Timothy N. Titus, Space Scientist U.S. Geological Survey, Astrogeology Team 2255 N. Gemini Dr., Flagstaff, AZ, 86001 Phone: (928) 556-7201 E-mail: ttitus@usgs.gov Education Military Service Highlights of Qualifications Professional Experience Research Interests Selected Publications Return to About:People

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Education

• Ph.D.,Astrophysics, University of Wyoming, Laramie, WY, 1996
• M.S., Astrophysics, Iowa State University, Ames, IA, 1988
• B.A., Physics/Mathematics, Drake University, Des Moines, IA, 1985

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Military Service

Lieutenant Colonel Timothy N. Titus
J4, Director of Logistics
Joint Staff
Arizona Army National Guard
Phoenix, AZ

Military Education:

• Engineer Officer Basic Course (1988)
• Artillery Officer Advance Course (1992)
• Combined Arms Service and Staff School (1995)
• Command General Staff College (2000)
• Quartermaster Officer Advance Course (2003)

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Highlights of Qualifications

• Selected as a Mars Reconnaissance Orbiter Participating Scientist on CRISM
• Extensive experience analyzing Mars Odyssey (ODY) THermal Emission IMaging System (THEMIS) data.
• Extensive experience extracting and analyzing Mars Global Surveyor (MGS) Thermal Emission Spectrometer (TES) data.
• Extensive knowledge of several programming languages, including IDL.
• Writes and maintains a GUI software package that enhances the analysis of TES spectral data.
• Extensive knowledge of multivariate analysis techniques, especially Principal Components Analysis (PCA).

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Professional Experience

1999-Present	Space Scientist	U.S. Geological Survey, Flagstaff, AZ. Research: Spectral analysis of Martian polar regions using data from MGS TES.
1997-1999	Remote Sensing Analyst	Contracted with the U.S. Geological Survey, Flagstaff, AZ, and Oak Ridge Associated Universities, Oak Ridge, TN. Research: Spectral analysis of Martian polar regions using data from MGS TES.
1996 - 1997	Staff Lecturer	University of Wyoming, Laramie, WY. Research: Multivariate analysis of galaxy spectra

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Research Interests

• Mars Polar Processes: Specifically - the CO₂ cycle and polar energy balance.
• Mars Thermal Inertia Studies: Specifically - the use of 2-layer thermal inertia models to detect sub-surface ice.
• Mars Aeolian Studies: Specially - the global inventory and characterization of Mars dunes.
• Cave Detection using the Thermal Infrared Remote Sensing: Specifically - using ground truth thermal characterization of terrestrial caves to develope techniques and procedures for detecting caves on Earth, the Moon, and Mars.

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Selected Publications

Mellon, M. T., Boynton, W. V., Feldman, W. C., Arvidson, R. E., Titus, T. N., Bandfield, J. L., Putzig, N., and Sizemore, H., 2008, A Pre-Landing Assessment of the Ice-Table Depth and Ground-Ice Characteristics in Martian Permafrost at the Phoenix Landing Site, J. Geophys. Res., doi:10.1029/2007JE003067, in press.

Titus, T.N., W . M . Calvin, H . H . Kieffer, Y. Langevin, T.H. Prettyman, Martian Polar Processes, Ch. 25 in Bell III, J. F., ed., 2008, The Martian Surface: Composition, Mineralogy, and Physical Properties, Cambridge University Press. ISBN: 9780521866989.

Wynne, J. Judson; Titus, Timothy N.; Chong Diaz, Guillermo, 2008, On developing thermal cave detection techniques for earth, the moon and mars, Earth and Planetary Science Letters, Volume 272, Issue 1-2, p. 240-250.

Cushing, Glen E.; Titus, Timothy N., 2008, MGS-TES thermal inertia study of the Arsia Mons Caldera, Journal of Geophysical Research, Volume 113, Issue E6, CiteID E06006

Titus, Timothy N.; Colaprete, Anthony; Prettyman, Thomas H., 2008 Introduction to planetary and space science special issue: Mars polar processes, Planetary and Space Science, Volume 56, Issue 2, p. 147-149.

Calvin, W. M.; Titus, T. N., 2008 Summer season variability of the north residual cap of Mars as observed by the Mars Global Surveyor Thermal Emission Spectrometer (MGS-TES), Planetary and Space Science, Volume 56, Issue 2, p. 212-226.

Wagstaff, Kiri L.; Titus, Timothy N.; Ivanov, Anton B.; CastañRebecca; Bandfield, Joshua L., 2008 Observations of the north polar water ice annulus on Mars using THEMIS and TES, Planetary and Space Science, Volume 56, Issue 2, p. 256-265.

Hayward, Rosalyn K.; Mullins, Kevin F.; Fenton, Lori K.; Hare, Trent M.; Titus, Timothy N.; Bourke, Mary C.; Colaprete, Anthony; Christensen, Philip R., 2007, Mars Global Digital Dune Database and initial science results, Journal of Geophysical Research, Volume 112, Issue E11, CiteID E11007

Cushing, G. E.; Titus, T. N.; Wynne, J. J.; Christensen, P. R., 2007 THEMIS observes possible cave skylights on Mars Geophysical Research Letters, Volume 34, L17201

Armstrong, J. C.; Nielson, S. K.; Titus, T. N., 2007, Survey of TES high albedo events in Mars' northern polar craters, Geophysical Research Letters, Volume 34, Issue 1, CiteID L01202

Kieffer, Hugh H.; Christensen, Philip R.; Titus, Timothy N.,2006, CO2 jets formed by sublimation beneath translucent slab ice in Mars' seasonal south polar ice cap, Nature, Volume 442, Issue 7104, pp. 793-796.

Johnson, J., Staid, M., Titus, T., Becker, K., 2006, Shocked plagioclase signatures in Thermal Emission Spectrometer data of Mars, Icarus, Volume 180, Issue 1, p. 60-74.

Titus, T., 2005, Thermal infrared and visual observations of a water ice lag in the Mars southern summer, Geophys. Res. Lett., Vol. 32, L24204, doi:10.1029/2005GL024211.

Cushing, G., Titus, T., Christensen, P.,2005, THEMIS VIS and IR observations of a high-altitude Martian dust devil, Geophys. Res. Lett., Vol. 32, L23202, doi:10.1029/2005GL024478.

Titus, T., Colaprete,A., 2005, Mars Atmospheric Surface Interactions and the CO2 Cycle, Eos Trans. AGU, 86(46), 462, doi:10.1029/2005EO460006.

Colaprete, A, Barnes, J., Haberle, R., Hollingsworth, J., Kieffer, H., Titus, T.,2005, Albedo of the south pole on Mars determined by topographic forcing of atmosphere dynamics, Nature, Volume 435, Issue 7039, pp. 184-188.

Armstrong, J., Titus, T., Kieffer, H., 2005, Evidence for subsurface water ice in Korolev crater, Icarus, Volume 174, Issue 2, p. 360-372.

Eluszkiewicz, J., Moncet, J-L., Titus, T., Hansen, G., 2005, A microphysically-based approach to modeling emissivity and albedo of the martian seasonal caps, Icarus, Volume 174, Issue 2, p. 524-534.

James, P., Hansen, G., Titus, T., 2005,The carbon dioxide cycle, Advances in Space Research, Volume 35, Issue 1, p. 14-20.

Prettyman, T., Titus, T., 2004, Exploring Martian Polar Atmospheric Circulation and Surface Interactions, Eos Trans. AGU, 85(41), 403, doi:10.1029/2004EO410005.

Haberle, R., Mattingly, B., Titus, T., 2004, Reconciling different observations of the CO2 ice mass loading of the Martian north polar cap, Geophysical Research Letters, Volume 31, Issue 5, CiteID L05702.

Titus, T., 2004, Mars: Water, water everywhere, Nature, Volume 428, Issue 6983, pp. 610-611.

Titus, T., Kieffer, H., Christensen, P.,2003, Exposed Water Ice Discovered near the South Pole of Mars, Science, Vol. 299, Issue 5609, pp. 1048-1051.

Kieffer, H., Titus, T.,2001, TES mapping of Mars' north seasonal cap, Icarus, Vol. 154, Issue 1, pp. 162-180.

Titus, T., Kieffer, H, 2001, Slab Ice and Snow Flurries in the Martian Polar Night, J. Geophys. Res. Vol. 106 , No. E10 , p. 23,181.

Kieffer, H., Titus, T., Mullins, K., Christensen, P.,1999, Mars south polar spring and summer behavior observed by TES: Season cap evolution controlled by frost grain size., J.Geophys. Res., vol. 105, no. E4, 9653-9699.

Titus, T., Spillar, E., Johnson, P.,1997, Population analysis of faint galaxies with mixture modeling., Astron. J., 114, 958.

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