Publications		Joel Harper Department of Geosciences, University of Montana
Papers (updated ~once yr-1)
Pfeffer, W. T., J. T. Harper, and S. O'Neel (2008), Kinematic constraints on glacier contributions to 21st-century sea-level rise, Science, 321(5894), 1340-1343. Bradford, J. H., J. Nichols, M. T. D., and J. T. Harper (in press), Continuous Profiles Of Electromagnetic Wave Velocity and Water Content in Glaciers, Annals of Glaciology. Meierbachtol, T., J. T. Harper, N. F. Humphrey, J. Shaha, and J. Bradford ( 2008), Air Compression As A Mechanism For The Underdamped Slug Test Response In Fractured Glacier Ice, Journal of Geophysical Research Earth Surface, 113, F04009, doi:10.1029/2007JF000908. Fudge, T. J., N. F. Humphrey, J. T. Harper, and W. T. Pfeffer (2008), Diurnal Fluctuations in Borehole Water Levels: Configuration of the Drainage System Beneath Bench Glacier, Alaska, Journal of Glaciology, 54(185), 297-306, doi 210.3189/002214308784886072. Harper, J. T., N. F. Humphrey, W. T. Pfeffer, and B. Lazar (2007), Two modes of Accelerated Glacier Sliding Related to Water, Geophysical Research Letters, 34(12), L12503, doi:12510.11029/12007GL030233. Moore, J. N., J. T. Harper, and M. C. Greenwood (2007), Significance of trends toward earlier snowmelt runoff, Columbia and Missouri Basin headwaters, western United States, Journal of Geophysical Research, 34, L16402, doi:16410.11029/12007GL031022. Bleha, J. A., and J. T. Harper (2007), Snowmelt Water Generation in a Large Mountain Basin of Northwest Montana from a MODIS Driven Model, paper presented at Symposium on Environmental Sensing, Inland Northwest Research Alliance, Boise, ID, Oct. 25-26. Bradford, J. H., and J. T. Harper (2006), Measuring complex dielectric permittivity from GPR to estimate liquid water content in snow, Society of Exploration Geophysicists Technical Program, 25, 1352-1356, doi:1310.1190/1351.2369770. Bradford, J. H., and J. T. Harper (2005), Wavefield Migration as a Tool for Estimating Spatially Continuous Radar Velocity and Water Content in Glaciers, Geophysical Research Letters, 32, L08502, doi:08510.01029/02004GL021770. Fudge, T. J., J. T. Harper, N. F. Humphrey, and W. T. Pfeffer (2005), Timing and pattern of termination of diurnal water pressure fluctuations: Bench Glacier, Alaska, Annals of Glaciology, 40, 102-106. Harper, J. T., N. F. Humphrey, W. T. Pfeffer, T. Fudge, and S. O'Neel (2005), Evolution of subglacial water pressure along a glacier's length, Annals of Glaciology, 40, 31-36. Harper, J. T., and N. F. Humphrey (2003), High altitude Himalayan climate inferred from glacial ice flux, Geophysical Research Letters, 30(14), 1764-1769, doi:1710.1029/2003GL017329. Harper, J. T., and J. H. Bradford (2003), Snow stratigraphy over a uniform depositional surface: spatial variability and measurement tools, Cold Regions Science and Technology, 37(3), 289-298. Harper, J. T., N. F. Humphrey, and M. C. Greenwood (2002), Basal conditions and glacier motion during the winter/spring transition, Worthington Glacier, Alaska, U.S.A, Journal of Glaciology, 48(160), 42-50. Harper, J. T., and J. H. Bradford (2002), Spatial variability of snow stratification in the absence of terrain factors, paper presented at International Snow Science Workshop, International Snow Science Workshop Canada Inc., Penticton, B.C. Canada. Marshall, H. P., J. T. Harper, W. T. Pfeffer, and N. F. Humphrey (2002), Depth-varying constitutive properties observed in an isothermal glacier, Geophysical Research Letters, 29(61), 1-4. Harper, J. T., N. F. Humphrey, W. T. Pfeffer, S. V. Huzurbazar, D. B. Bahr, and B. C. Welch (2001), Spatial variability in the flow of a valley glacier: Deformation of a large array of boreholes, Journal of Geophysical Research, 106(B5), 8547-8562. Pfeffer, W. T., N. F. Humphrey, B. Amadei, J. T. Harper, and W. J. (2000), In-situ stress tensor measured in an Alaskan glacier, Annals of Glaciology, 31, 229-235. Harper, J. T., N. F. Humphrey, and W. T. Pfeffer (1998), Three-dimensional deformation measured in an Alaskan Glacier, Science, 281(5381), 1340-1342. Harper, J. T., N. F. Humphrey, and W. T. Pfeffer (1998), Crevasse patterns and the strain rate tensor: a high resolution comparison, Journal of Glaciology, 44(146), 68-76. Jones, L. S., and J. T. Harper (1998), Channel avulsions and related processes, and large-scale sedimentation patterns since 1875, Rio Grande, San Luis Valley, Colorado, Geological Society of America Bulletin, 110(3), 411-421. Welch, B. C., W. T. Pfeffer, J. T. Harper, and N. F. Humphrey (1998), Mapping subglacial surfaces below temperate valley glaciers using 3-dimensional radio-echo sounding techniques, Journal of Glaciology, 44(146), 164-170. Harper, J. T., N. F. Humphrey, W. T. Pfeffer, and B. C. Welch (1996), Short wavelength variations in the horizontal velocity field of a valley glacier, in Glaciers, Ice Sheets and Volcanoes, edited by S. C. Colbeck, pp. 41-48, U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, N.H. Welch, B. C., W. T. Pfeffer, J. T. Harper, and N. F. Humphrey (1996), A maximum glacier-bed surface obtained by radio-echo sounding, in Glaciers, Ice Sheets and Volcanoes, edited by S. C. Colbeck, pp. 105-110, U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, N.H. Harper, J. T., and N. F. Humphrey (1995), Borehole video analysis of a temperate glacier's englacial and subglacial structure; implications for glacier flow models, Geology, 23(10), 901-904. Harper, J. T. (1993), Glacier terminus fluctuations on Mount Baker, Washington, U.S.A., 1940-1990, and climatic variations, Arctic and Alpine Research, 25(4), 332-340.
Last Year's Abstracts (to get a feel for ongoing research)
Harper, J. T., J. H. Bradford, N. F. Humphrey, T. W. Meierbachtol, and W. T. Pfeffer (2008), Fractures As An Extension Of The Subglacial Drainage System, in Workshop on the Mass Balance and Dynamics of Arctic Glaciers, edited by J. Oerlemans and C. Tijm-Reijmer, pp. 57-59, Institute for Marine and Atmospheric Research, Utrecht University, The Netherlands, Obergurgl, Austria. Harper, J. T., N. F. Humphrey, W. T. Pfeffer, J. Brown, D. R. Schuler, and D. Sturgis (2008), Densification and Melt water Runoff on The Greenland Ice Sheet, in Workshop on the Mass Balance and Dynamics of Arctic Glaciers, edited by J. Oerlemans and C. Tijm-Reijmer, pp. 60-61, Institute for Marine and Atmospheric Research, Utrecht University, The Netherlands, Obergurgl, Austria. Reardon, B. A., J. T. Harper, and D. B. Fagre (2008), Mass Balance Sensitivity Of Cirque Glaciers In The Northern U.S. Rocky Mountains, Montana, U.S.A, in Workshop on mass balance measurements and modeling, edited by J. O. Hagen, et al., pp. 1-5, International Glaciological Society, Skeikampen, Norway. Nichols, J., J. Bradford, J. Harper, T. Meierbachtol, and N. Humphrey (2008), Detection of Fracture Induced Anisotropy in Temperate Glaciers Using Georadar, Eos Trans. AGU, 89(53), Abstract NS43A-1178. Humphrey, N. F., S. V. Huzurbazar, A. Chatterjee, J. T. Harper, and W. T. Pfeffer (2008), Deriving Spatial and Temporal Statistics of Meltwater Infiltration Using a Bayesian Hierarchical Modeling Analysis of 10m Borehole Thermal Data, Eos Trans. AGU, 89(53), Abstract C13A-0561. Brown, J. M., J. H. Bradford, J. T. Harper, W. T. Pfeffer, and N. F. Humphrey (2008), Change in Firn Densification Rates to 80 m Depth Across the Percolation Zone of Western Greenland, Eos Trans. AGU, 89(53), Abstract C31B-0490. Bradford, J. H., J. Nichols, D. Mikesell, J. T. Harper, and N. Humphrey (2008), In-situ measurement of the elastic properties in a temperate glacier using SH, P, and 3D seismic reflection analysis, Eos Trans. AGU, 89(53), Abstract NS41A-02.
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