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Joseph A MacGregor

Photo of JOSEPH MACGREGOR

Joseph A MacGregor

  • RSCH AST, EARTH SCIENCES REMOTE SENS
  • 301.614.5876
  • NASA/GSFC
  • Mail Code: 615
  • Greenbelt , MD 20771
  • Employer: NASA

    • Brief Bio

    Joe MacGregor is a glaciologist and geophysicist interested in the past, present and future flow of ice sheets. He seeks to understand why ice sheets flow more quickly in some areas than in others, how this flow evolves over time and how we can better observe the controls upon ice flow. These are critical concerns for Earth’s two remaining ice sheets in Greenland and Antarctica, along with ice masses elsewhere in the Solar System. With a diverse set of collaborators at NASA and partner institutions, his current research synthesizes observations from a variety of methods, including airborne radar sounding (e.g., Operation IceBridge), satellite remote sensing (e.g., Landsat, MODIS, InSAR), ground-based surveys (e.g., ice core chemistry, borehole thermometry) and laboratory measurements (e.g., dielectric spectroscopy) to better understand ice sheets.

    Education

    2008 - Ph.D., Geophysics, University of Washington (Seattle, WA)

    2002 - B.S. with honors, Geophysical Engineering, Minor: Public Affairs for Engineers, Colorado School of Mines (Golden, CO)

    Positions/Employment

    5/2018 - 9/2021

    Project Scientist, Operation IceBridge (OIB)

    Cryospheric Sciences Laboratory (Code 615), NASA Goddard Space Flight Center (GSFC), Greenbelt, MD
    3/2016 - 5/2018

    Deputy Project Scientist, OIB

    Code 615, NASA GSFC, Greenbelt, MD
    2/2016 - Present

    Research Physical Scientist

    Code 615, NASA GSFC, Greenbelt, MD
    9/2013 - 2/2016

    Research Associate

    Institute for Geophysics, The University of Texas at Austin (UTIG), Austin, TX
    9/2011 - 8/2013

    Research Scientist Associate V

    UTIG, Austin, TX
    10/2009 - 8/2011

    Postdoctoral Fellow

    UTIG, Austin, TX
    9/2008 - 9/2009

    Research Associate

    Dept. of Geosciences, The Pennsylvania State University, State College, PA

    Awards

    • 2022 - NASA GSFC HBG Peer Award for Best Publication – First Author Civil Servant
    • 2020 - Robert H. Goddard Award, Science Team (Operation IceBridge)
    • 2019 - Best Science Story, NASA GSFC SED Poster Party
    • 2017 - NASA 610 HBG Best Science Paper
    • 2013 - NASA Cryospheric Sciences Most Valuble Player
    • 2011 - UTIG Director's Circle of Excellence
    • 2008 - David A. Johnston Award for Research Excellence

    Professional Service

    Other Professional Information

    Google Scholar page

    Publications

    Refereed

    Frémand, A. C., P. Fretwell, J. Bodart, et al. H. D. Pritchard, A. Aitken, J. L. Bamber, R. Bell, C. Bianchi, R. G. Bingham, D. D. Blankenship, G. Casassa, G. Catania, K. Christianson, H. Conway, H. F. Corr, X. Cui, D. Damaske, V. Damm, R. Drews, G. Eagles, O. Eisen, H. Eisermann, F. Ferraccioli, E. Field, R. Forsberg, S. Franke, S. Fujita, Y. Gim, V. Goel, S. P. Gogineni, J. Greenbaum, B. Hills, R. C. Hindmarsh, P. Holmlund, N. Holschuh, J. W. Holt, A. Humbert, R. W. Jacobel, D. Jansen, A. Jenkins, W. Jokat, T. Jordan, E. King, J. Kohler, W. Krabill, K. Langley, J. Lee, G. Leitchenkov, C. Leuschen, B. Luyendyk, J. MacGregor, E. MacKie, K. Matsuoka, M. Morlinghem, J. Mouginot, F. O. Nitsche, Y. Nogi, O. A. Nost, J. Paden, F. Pattyn, S. V. Popov, M. Riger-Kusk, E. Rignot, D. M. Rippin, A. Rivera, J. Roberts, N. Ross, A. Ruppel, D. M. Schroeder, M. J. Siegert, A. M. Smith, D. Steinhage, M. Studinger, B. Sun, I. Tabacco, K. Tinto, S. Urbini, D. Vaughan, B. C. Welch, D. S. Wilson, D. A. Young, and A. Zirizzotti. 2023. "Antarctic Bedmap data: FAIR sharing of 60 years of ice bed, surface and thickness data." Earth System Science Data, 15 (7): 2695-2710 [10.5194/essd-2022-355]

    Bodart, J. A., R. G. Bingham, D. A. Young, et al. J. A. MacGregor, D. W. Ashmore, E. Quartini, A. S. Hein, D. G. Vaughan, and D. D. Blankenship. 2023. "High mid-Holocene accumulation rates over West Antarctica inferred from a pervasive ice-penetrating radar reflector." The Cryosphere, 17: [10.5194/tc-2022-199]

    Colgan, W., J. Jakobsen, A. Solgaard, et al. A. Løkkegaard, J. Abermann, S. A. Khan, B. Csatho, J. A. MacGregor, R. S. Fausto, N. Karlsson, A. Pedersen, S. B. Andersen, J. Sonntag, C. S. Hvidberg, and A. P. Ahlstrøm. 2022. "Sixty years of ice form and flow at Camp Century, Greenland." Journal of Glaciology, [10.1017/jog.2022.112]

    Briner, J. P., C. K. Walcott, J. M. Schaefer, et al. N. E. Young, J. A. MacGregor, K. Poinar, B. A. Keisling, S. Anandakrishnan, M. R. Albert, T. Kuhl, and G. Boeckmann. 2022. "Drill-site selection for cosmogenic-nuclide exposure dating of the bed of the Greenland Ice Sheet." The Cryosphere, 16 (10): 3933-3948 [10.5194/tc-16-3933-2022]

    MacGregor, J. A., W. Chu, W. T. Colgan, et al. M. A. Fahnestock, D. Felikson, N. B. Karlsson, S. M. Nowicki, and M. Studinger. 2022. "GBaTSv2: A revised synthesis of the likely basal thermal state of the Greenland Ice Sheet." The Cryosphere, [10.5194/tc-16-3033-2022]

    Colgan, W., A. Wansing, K. Mankoff, et al. M. Lösing, J. Hopper, K. Louden, J. Ebbing, F. G. Christiansen, T. Ingeman-Nielsen, L. C. Liljedahl, J. A. MacGregor, Á. Hjartarson, S. Bernstein, N. B. Karlsson, S. Fuchs, J. Hartikainen, J. Liakka, R. S. Fausto, D. Dahl-Jensen, A. Bjørk, J.-O. Naslund, F. Mørk, Y. Martos, N. Balling, T. Funck, K. K. Kjeldsen, D. Petersen, U. Gregersen, G. Dam, T. Nielsen, S. A. Khan, and A. Løkkegaard. 2022. "Greenland Geothermal Heat Flow Database and Map (Version 1)." Earth System Science Data, 14 (5): 2209-2238 [10.5194/essd-14-2209-2022]

    Kenny, G. G., W. R. Hyde, M. Storey, et al. A. A. Garde, M. J. Whitehouse, P. Beck, L. Johansson, A. S. Søndergaard, A. A. Bjørk, J. A. MacGregor, S. A. Khan, J. Mouginot, B. C. Johnson, E. A. Silber, D. K. Wielandt, K. H. Kjær, and N. K. Larsen. 2022. "A Late Paleocene age for Greenland’s Hiawatha impact structure." Science Advances, 8 (10): [10.1126/sciadv.abm2434]

    Silber, E. A., B. C. Johnson, E. Bjonnes, et al. J. A. MacGregor, N. K. Larsen, and S. E. Wiggins. 2021. "Effect of ice sheet thickness on formation of the Hiawatha impact crater." Earth and Planetary Science Letters, 566: 116972 [10.1016/j.epsl.2021.116972]

    Karlsson, N. B., A. M. Solgaard, K. D. Mankoff, et al. F. Gillet-Chaulet, J. A. MacGregor, J. E. Box, M. Citterio, W. T. Colgan, S. H. Larsen, K. K. Kjeldsen, N. J. Korsgaard, D. I. Benn, I. J. Hewitt, and R. S. Fausto. 2021. "A first constraint on basal melt-water production of the Greenland ice sheet." Nature Communications, 12 (1): 3461 [10.1038/s41467-021-23739-z]

    MacGregor, J. A., M. Studinger, E. Arnold, et al. C. J. Leuschen, F. Rodríguez-Morales, and J. D. Paden. 2021. "Brief communication: An empirical relation between center frequency and measured thickness for radar sounding of temperate glaciers." The Cryosphere, 15 (6): 2569-2574 [10.5194/tc-15-2569-2021]

    Bessette, J. T., D. M. Schroeder, T. M. Jordan, and J. A. MacGregor. 2021. "Radar‐Sounding Characterization of the Subglacial Groundwater Table Beneath Hiawatha Glacier, Greenland." Geophysical Research Letters, 48 (10): [10.1029/2020gl091432]

    MacGregor, J. A., L. N. Boisvert, B. Medley, et al. A. A. Petty, J. P. Harbeck, R. E. Bell, J. B. Blair, E. Blanchard‐Wrigglesworth, E. Buckley, M. S. Christoffersen, J. R. Cochran, B. M. Csathó, E. L. De Marco, R. T. Dominguez, M. A. Fahnestock, S. L. Farrell, S. P. Gogineni, J. S. Greenbaum, C. M. Hansen, M. A. Hofton, J. W. Holt, K. C. Jezek, L. S. Koenig, N. T. Kurtz, R. Kwok, C. F. Larsen, C. J. Leuschen, C. D. Locke, S. S. Manizade, S. Martin, T. A. Neumann, S. M. Nowicki, J. D. Paden, J. A. Richter‐Menge, E. J. Rignot, F. Rodríguez‐Morales, M. R. Siegfried, B. E. Smith, J. G. Sonntag, M. Studinger, K. J. Tinto, M. Truffer, T. P. Wagner, J. E. Woods, D. A. Young, and J. K. Yungel. 2021. "The scientific legacy of NASA's Operation IceBridge." Reviews of Geophysics, (59): e2020RG000712 [10.1029/2020rg000712]

    Colgan, W., J. A. MacGregor, K. D. Mankoff, et al. R. Haagenson, H. Rajaram, Y. M. Martos, M. Morlighem, M. A. Fahnestock, and K. K. Kjeldsen. 2021. "Topographic Correction of Geothermal Heat Flux in Greenland and Antarctica." Journal of Geophysical Research: Earth Surface, 126 (2): [10.1029/2020jf005598]

    Johnson, J. T., K. C. Jezek, G. Macelloni, et al. M. Brogioni, L. Tsang, E. Dinnat, J. P. Walker, N. Ye, S. Misra, J. R. Piepmeier, R. Bindlish, D. M. Le Vine, P. E. O'Neill, L. Kaleschke, M. Andrews, C. Yardim, M. Aksoy, M. Durand, C.-C. Chen, O. Demir, A. Bringer, J. Z. Miller, S. Brown, R. Kwok, T. Lee, Y. H. Kerr, D. Entekhabi, J. Peng, A. Colliander, S. K. Chan, J. Macgregor, B. C. Medley, R. D. De Roo, and M. Drinkwater. 2021. "Microwave Radiometry at Frequencies from 500 to 1400 MHz: An Emerging Technology for Earth Observations." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 1-1 [10.1109/jstars.2021.3073286]

    Kjeldsen, K. K., S. A. Khan, W. T. Colgan, J. A. MacGregor, and R. S. Fausto. 2020. "Time‐Varying Ice Sheet Mask: Implications on Ice‐Sheet Mass Balance and Crustal Uplift." Journal of Geophysical Research: Earth Surface, 125 (12): [10.1029/2020jf005775]

    MacGregor, J. A., M. A. Fahnestock, W. T. Colgan, et al. N. K. Larsen, K. K. Kjeldsen, and J. M. Welker. 2020. "The age of surface-exposed ice along the northern margin of the Greenland Ice Sheet." Journal of Glaciology, 66 (258): 667-684 [10.1017/jog.2020.62]

    MacGregor, J. A., W. F. Bottke, M. A. Fahnestock, et al. J. P. Harbeck, K. H. Kjaer, J. D. Paden, D. E. Stillman, and M. Studinger. 2019. "A Possible Second Large Subglacial Impact Crater in Northwest Greenland." Geophysical Research Letters, 46: [10.1029/2018gl078126]

    Winebrenner, D. P., P. M. Kintner, and J. A. MacGregor. 2019. "New Estimates of Ice and Oxygen Fluxes Across the Entire Lid of Lake Vostok from Observations of Englacial Radiowave Attenuation." Journal of Geophysical Research: Earth Surface, 124: [10.1029/2018jf004692]

    Alley, R. B., D. Pollard, B. R. Parizek, et al. S. Anandakrishnan, M. Pourpoint, N. T. Stevens, J. A. MacGregor, K. Christianson, A. Muto, and N. Holschuh. 2019. "Possible Role for Tectonics in the Evolving Stability of the Greenland Ice Sheet." Journal of Geophysical Research: Earth Surface, 124: [10.1029/2018jf004714]

    Kjær, K. H., N. K. Larsen, T. Binder, et al. A. A. Bjørk, O. Eisen, M. A. Fahnestock, S. Funder, A. A. Garde, H. Haack, V. Helm, M. Houmark-Nielsen, K. K. Kjeldsen, S. A. Khan, H. Machguth, I. McDonald, M. Morlighem, J. Mouginot, J. D. Paden, T. E. Waight, C. Weikusat, E. Willerslev, and J. A. MacGregor. 2018. "A large impact crater beneath Hiawatha Glacier in northwest Greenland." Science Advances, 4 (11): eaar8173 [10.1126/sciadv.aar8173]

    Kwok, R., N. T. Kurtz, L. Brucker, et al. A. Ivanoff, T. Newman, S. L. Farrell, J. King, S. Howell, M. A. Webster, J. Paden, C. Leuschen, J. A. Macgregor, J. Richter-Menge, J. Harbeck, and M. Tschudi. 2017. "Inter-comparison of snow depth retrievals over Arctic sea ice fromradar data acquired by Operation IceBridge." The Cryosphere, 2571-2593 [10.5194/tc-2017-103]

    Scambos, T., R. Bell, R. Alley, et al. S. Anandakrishnan, D. Bromwich, K. Brunt, K. Christianson, T. Creyts, S. Das, R. DeConto, P. Dutrieux, H. Fricker, D. Holland, J. MacGregor, B. Medley, J. Nicolas, D. Pollard, M. Siegfried, A. Smith, E. Steig, L. Trusel, D. Vaughan, and P. Yager. 2017. "How much, how fast?: A science review and outlook for research on the instability of Antarctica's Thwaites Glacier in the 21st century." Global and Planetary Change, 153: 16-34 [10.1016/j.gloplacha.2017.04.008]

    Koenig, L. S., A. Ivanoff, P. M. Alexander, et al. J. A. MacGregor, X. Fettweis, B. Panzer, J. D. Paden, R. R. Forster, I. Das, J. McConnell, M. Tedesco, C. Leuschen, and P. Gogineni. 2016. "Annual Greenland accumulation rates (2009–2012) from airborne Snow Radar." The Cryosphere, 10: 1739–1752 [10.5194/tcd-9-6697-2015]

    Colgan, W. T., H. Machguth, M. MacFerrin, et al. J. D. Colgan, D. van As, and J. A. Macgregor. 2016. "The abandoned ice-sheet base at Camp Century, Greenland, in a warming climate." Geophysical Research Letters, 43: [10.1002/2016GL069688]

    MacGregor, J. A., M. A. Fahnestock, G. A. Catania, et al. A. Aschwanden, G. D. Clow, W. T. Colgan, P. S. Gogineni, M. Morlighem, S. M. Nowicki, J. D. Paden, S. F. Price, and H. Seroussi. 2016. "A synthesis of the basal thermal state of the Greenland Ice Sheet." J. Geophys. Res. Earth Surf., 121: [10.1002/2015jf003803]

    Cavitte, M. G., D. D. Blankenship, D. A. Young, et al. D. M. Schroeder, F. Parrenin, E. Lemeur, J. A. Macgregor, and M. J. Siegert. 2016. "Deep radiostratigraphy of the East Antarctic plateau: connecting the Dome C and Vostok ice core sites." J. Glaciol., 1-12 [10.1017/jog.2016.11]

    MacGregor, J. A., W. T. Colgan, M. A. Fahnestock, et al. M. Morlighem, G. A. Catania, J. D. Paden, and S. P. Gogineni. 2016. "Holocene deceleration of the Greenland Ice Sheet." Science, 351 (6273): 590-593 [10.1126/science.aab1702]

    Grimm, R. E., D. E. Stillman, and J. A. MacGregor. 2015. "Dielectric signatures and evolution of glacier ice." Journal of Glaciology, 61 (230): 1159-1170 [10.3189/2015jog15j113]

    MacGregor, J. A., J. Li, J. D. Paden, et al. G. A. Catania, G. D. Clow, M. A. Fahnestock, S. P. Gogineni, R. E. Grimm, M. Morlighem, S. Nandi, H. Seroussi, and D. E. Stillman. 2015. "Radar attenuation and temperature within the Greenland Ice Sheet." J. Geophys. Res. Earth Surf., 120 (6): 983-1008 [10.1002/2014jf003418]

    Brunt, K. M., and J. A. Macgregor. 2015. "What Instruments are Available for Polar Studies?" Eos, 96: [10.1029/2015EO026855]

    MacGregor, J. A., M. A. Fahnestock, G. A. Catania, et al. J. D. Paden, S. Prasad Gogineni, S. K. Young, S. C. Rybarski, A. N. Mabrey, B. M. Wagman, and M. Morlighem. 2015. "Radiostratigraphy and age structure of the Greenland Ice Sheet." J. Geophys. Res. Earth Surf., 120 (2): 212-241 [10.1002/2014jf003215]

    Macgregor, J. A., G. A. Catania, H. Conway, et al. D. M. Schroeder, I. Joughin, D. A. Young, S. D. Kempf, and D. D. Blankenship. 2013. "Weak bed control of the eastern shear margin of Thwaites Glacier, West Antarctica." Journal of Glaciology, 59 (217): 900-912 [10.3189/2013jog13j050]

    Stillman, D. E., J. A. MacGregor, and R. E. Grimm. 2013. "Electrical response of ammonium-rich water ice." Annals of Glaciology, 54 (64): 21-26 [10.3189/2013aog64a204]

    Stillman, D. E., J. A. MacGregor, and R. E. Grimm. 2013. "The role of acids in electrical conduction through ice." J. Geophys. Res. Earth Surf., 118 (1): 1-16 [10.1029/2012jf002603]

    Matsuoka, K., J. A. MacGregor, and F. Pattyn. 2012. "Predicting radar attenuation within the Antarctic ice sheet." Earth and Planetary Science Letters, 359-360: 173-183 [10.1016/j.epsl.2012.10.018]

    MacGregor, J. A., K. Matsuoka, E. D. Waddington, D. P. Winebrenner, and F. Pattyn. 2012. "Spatial variation of englacial radar attenuation: Modeling approach and application to the Vostok flowline." Journal of Geophysical Research: Earth Surface, 117 (F3): [10.1029/2011jf002327]

    Macgregor, J. A., G. A. Catania, M. S. Markowski, and A. G. Andrews. 2012. "Widespread rifting and retreat of ice-shelf margins in the eastern Amundsen Sea Embayment between 1972 and 2011." Journal of Glaciology, 58 (209): 458-466 [10.3189/2012jog11j262]

    MacGregor, J. A., S. Anandakrishnan, G. A. Catania, and D. P. Winebrenner. 2011. "The grounding zone of the Ross Ice Shelf, West Antarctica, from ice-penetrating radar." Journal of Glaciology, 57 (205): 917-928.

    Jacobel, R. W., B. C. Welch, D. Osterhouse, R. Pettersson, and J. A. MacGregor. 2009. "Spatial variation of radar-derived basal conditions on Kamb Ice Stream, West Antarctica." Annals of Glaciology, 50 (51): 10-16 [10.3189/172756409789097504]

    MacGregor, J., K. Matsuoka, and M. Studinger. 2009. "Radar detection of accreted ice over Lake Vostok Antarctica." Earth Planet Sci Lett, 282 (1-4): 222-233 [10.1016/j.epsl.2009.03.018]

    MacGregor, J., K. Matsuoka, M. Studinger, E. Waddington, and D. Winebrenner. 2009. "Millennially averaged accumulation rates for the Lake Vostok region inferred from deep internal layers." Annals of Glaciology, 50 (51): 25-34.

    MacGregor, J. A., D. P. Winebrenner, H. Conway, et al. K. Matsuoka, P. A. Mayewski, and G. D. Clow. 2007. "Modeling englacial radar attenuation at Siple Dome, West Antarctica, using ice chemistry and temperature data." Journal of Geophysical Research, 112 (F3): F03008 [10.1029/2006jf000717]

    O'Neal, M. A., M. E. O'Mansky, and J. A. MacGregor. 2005. "Modeling the natural degradation of earthworks." Geoarchaeology, 20 (7): 739-748 [10.1002/gea.20079]

    Non-Refereed

    Smith, I., W. M. Calvin, D. E. Smith, et al. C. Hansen, S. Diniega, A. McEwen, N. Thomas, D. Banfield, T. N. Titus, P. Becerra, M. Kahre, F. Forget, M. Hecht, S. Byrne, C. S. Hvidberg, P. O. Hayne, J. W. Iii, M. Mellon, B. Horgan, J. Mustard, J. W. Holt, A. Howard, D. McCleese, C. Stoker, P. James, N. E. Putzig, J. Whitten, P. Buhler, A. Spiga, M. Crismani, K. M. Aye, A. Portyankina, R. Orosei, A. Bramson, J. Hanley, M. Sori, O. Aharonson, S. Clifford, H. Sizemore, G. Morgan, B. Hartmann, N. Schorghofer, R. Clark, D. Berman, D. Crown, F. Chuang, M. Siegler, E. N. Dobrea, K. Lynch, R. W. Obbard, M. R. Elmaary, D. Fisher, A. Kleinboehl, M. Balme, B. Schmitt, M. Daly, R. C. Ewing, K. E. Herkenhoff, L. Fenton, S. D. Guzewich, M. Koutnik, J. Levy, R. Massey, A. Łosiak, V. Eke, D. Goldsby, A. Cross, T. Hager, S. Piqueux, A. Kereszturi, K. Seelos, S. Wood, E. Hauber, C. Amos, P. Russell, R. Jaumann, G. Michael, S. Conway, A. Khayat, S. Lewis, G. Luizzi, G. Martinez, K. Mesick, L. Montabone, A. Johnsson, A. Pankine, C. Phillips-Lander, P. Read, L. Edgar, K. Zacny, A. McAdam, A. Rutledge, T. Bertrand, J. Widmer, D. Stillman, A. Soto, Z. Yoldi, R. Young, A. Svensson, L. Sam, M. Landis, A. Bhardwaj, M. Chojnacki, E. Kite, P. Thomas, J. Plaut, J. Bapst, S. Milkovich, J. Whiteway, J. Moores, C. Rezza, R. Karimova, I. Mishev, A. V. Brenen, P. Acharya, J. Chesal, A. Pascuzzo, E. Vos, G. Osinski, C. Andres, C. Neisch, S. Hibbard, P. Sinha, J. P. Knightly, S. Cartwright, S. Kounaves, C. Orgel, M. Skidmore, J. MacGregor, R. Staehle, J. Rabassa, C. Gallagher, A. Coronato, A. G. Galofre, J. Wilson, L. McKeown, N. Oliveira, P. Fawdon, U. Gayathri, C. Stuurman, C. Herny, F. Butcher, F. Bernardini, M. Perry, R. Hu, S. Mukherjee, V. Chevrier, M. E. Banks, T. Meng, P. A. Johnson, B. Tober, J. C. Johnson, S. Ulamsec, J. C. Echaurren, A. Khuller, C. Dinwiddie, S. Adeli, B. L. Henderson, L. R. Lozano, D. Lalich, E. Rivera-Valentín, S. Nerozzi, E. Petersen, F. Foss, R. Lorenz, J. Eigenbrode, M. Day, A. Brown, M. Pajola, Ö. Karatekin, A. Lucchetti, C. Cesar, C. Newman, T. G. Cave, L. Tamppari, M. Mischna, M. Patel, P. Streeter, J. C. Stern, and C. M. Dundas. 2021. "Solar-System-Wide Significance of Mars Polar Science." Vol. 53, Issue 4 (Planetary/Astrobiology Decadal Survey Whitepapers) 53 (4): [10.3847/25c2cfeb.4db95c67]

    MacGregor, J. A. 2014. "Cryosphere: Bottom-up restructuring of ice." Nature Geosci 7 (7): 481-482 [10.1038/ngeo2191]

    Grants

    01/23/2003 - Greenland-scape: Uncovering topography and geology beneath the Greenland Ice Sheet, NASA Earth Surface and Interior
    PI
    01/01/2021 - 12/31/2023 Calibrated sensitivity of the Greenland Ice Sheet to major climate changes from next-generation radiostratigraphy and ensemble modeling, NASA Cryospheric Sciences
    PI
    03/01/2019 - 09/30/2019 Reconnaissance of the ice margin near the Hiawatha impact crater, NASA Goddard Fellows Innovation Challenge
    PI
    01/01/2016 - 12/31/2018 A peek into the history of the Greenland Ice Sheet using radar layers and modeling, NASA Cryospheric Science
    Co-I
    01/01/2015 - 12/31/2017 New estimates of the oxygen flux into, and its distribution within, Lake Vostok using radar sounding observations, NASA Habitable Worlds
    Co-I
    01/01/2015 - 12/31/2017 Accumulation and flow of the Greenland Ice Sheet during the late Holocene, NASA IceBridge Research
    PI
    01/01/2014 - 12/31/2016 Partitioning of soluble impurities in ice: A foundation for planetary radar exploration, NASA Planetary Geology & Geophysics
    Co-I
    01/01/2014 - 12/31/2014 Accumulation and flow of the Greenland Ice Sheet during the Anthropocene, UT Jackson School of Geosciences Seed Grant Program
    PI
    01/01/2012 - 12/31/2014 A synthetic approach to mapping the thermal state of the bed of the Greenland Ice Sheet and critical boundary conditions for the next generation of ice-sheet models, NASA IceBridge Research
    Post-doc
    01/01/2012 - 12/31/2014 Collaborative Research: A new radiostratigraphy of the Greenland Ice Sheet and critical boundary conditions for the next generation of ice-sheet models, NSF Arctic Natural Sciences
    Post-doc
    01/01/2010 - 12/31/2012 New broadband measurements of the dielectric properties of ice cores: A foundation for planetary radar sounding, NASA Planetary Geology & Geophysics
    Post-doc

    Selected Public Outreach

    A possible second large subglacial impact crater in northwest Greenland 2 / 2019 - 2 / 2019
    https://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=4691

    NASA SVS animation contextualizing second possible impact crater in northwest Greenland.

    Massive Crater Discovered under Greenland Ice 11 / 2018 - 11 / 2018
    https://svs.gsfc.nasa.gov/12941

    NASA collaborative production describing the discovery of the Hiawatha impact crater.

    Greenland Ice Sheet stratigraphy 2015 - 2015
    http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=4249

    NASA SVS animation illustrating collection, tracing and dating of Greenland's internal stratigraphy.

    Professional Societies

    American Geophysical Union, 2002 - Present
    International Glaciological Society, 2002 - Present

    Brief Bio

    Joe MacGregor is a glaciologist and geophysicist interested in the past, present and future flow of ice sheets. He seeks to understand why ice sheets flow more quickly in some areas than in others, how this flow evolves over time and how we can better observe the controls upon ice flow. These are critical concerns for Earth’s two remaining ice sheets in Greenland and Antarctica, along with ice masses elsewhere in the Solar System. With a diverse set of collaborators at NASA and partner institutions, his current research synthesizes observations from a variety of methods, including airborne radar sounding (e.g., Operation IceBridge), satellite remote sensing (e.g., Landsat, MODIS, InSAR), ground-based surveys (e.g., ice core chemistry, borehole thermometry) and laboratory measurements (e.g., dielectric spectroscopy) to better understand ice sheets.

    Publications

    Refereed

    Frémand, A. C., P. Fretwell, J. Bodart, et al. H. D. Pritchard, A. Aitken, J. L. Bamber, R. Bell, C. Bianchi, R. G. Bingham, D. D. Blankenship, G. Casassa, G. Catania, K. Christianson, H. Conway, H. F. Corr, X. Cui, D. Damaske, V. Damm, R. Drews, G. Eagles, O. Eisen, H. Eisermann, F. Ferraccioli, E. Field, R. Forsberg, S. Franke, S. Fujita, Y. Gim, V. Goel, S. P. Gogineni, J. Greenbaum, B. Hills, R. C. Hindmarsh, P. Holmlund, N. Holschuh, J. W. Holt, A. Humbert, R. W. Jacobel, D. Jansen, A. Jenkins, W. Jokat, T. Jordan, E. King, J. Kohler, W. Krabill, K. Langley, J. Lee, G. Leitchenkov, C. Leuschen, B. Luyendyk, J. MacGregor, E. MacKie, K. Matsuoka, M. Morlinghem, J. Mouginot, F. O. Nitsche, Y. Nogi, O. A. Nost, J. Paden, F. Pattyn, S. V. Popov, M. Riger-Kusk, E. Rignot, D. M. Rippin, A. Rivera, J. Roberts, N. Ross, A. Ruppel, D. M. Schroeder, M. J. Siegert, A. M. Smith, D. Steinhage, M. Studinger, B. Sun, I. Tabacco, K. Tinto, S. Urbini, D. Vaughan, B. C. Welch, D. S. Wilson, D. A. Young, and A. Zirizzotti. 2023. "Antarctic Bedmap data: FAIR sharing of 60 years of ice bed, surface and thickness data." Earth System Science Data 15 (7): 2695-2710 [10.5194/essd-2022-355]

    Bodart, J. A., R. G. Bingham, D. A. Young, et al. J. A. MacGregor, D. W. Ashmore, E. Quartini, A. S. Hein, D. G. Vaughan, and D. D. Blankenship. 2023. "High mid-Holocene accumulation rates over West Antarctica inferred from a pervasive ice-penetrating radar reflector." The Cryosphere 17 [10.5194/tc-2022-199]

    Colgan, W., J. Jakobsen, A. Solgaard, et al. A. Løkkegaard, J. Abermann, S. A. Khan, B. Csatho, J. A. MacGregor, R. S. Fausto, N. Karlsson, A. Pedersen, S. B. Andersen, J. Sonntag, C. S. Hvidberg, and A. P. Ahlstrøm. 2022. "Sixty years of ice form and flow at Camp Century, Greenland." Journal of Glaciology [10.1017/jog.2022.112]

    Briner, J. P., C. K. Walcott, J. M. Schaefer, et al. N. E. Young, J. A. MacGregor, K. Poinar, B. A. Keisling, S. Anandakrishnan, M. R. Albert, T. Kuhl, and G. Boeckmann. 2022. "Drill-site selection for cosmogenic-nuclide exposure dating of the bed of the Greenland Ice Sheet." The Cryosphere 16 (10): 3933-3948 [10.5194/tc-16-3933-2022]

    MacGregor, J. A., W. Chu, W. T. Colgan, et al. M. A. Fahnestock, D. Felikson, N. B. Karlsson, S. M. Nowicki, and M. Studinger. 2022. "GBaTSv2: A revised synthesis of the likely basal thermal state of the Greenland Ice Sheet." The Cryosphere [10.5194/tc-16-3033-2022]

    Colgan, W., A. Wansing, K. Mankoff, et al. M. Lösing, J. Hopper, K. Louden, J. Ebbing, F. G. Christiansen, T. Ingeman-Nielsen, L. C. Liljedahl, J. A. MacGregor, Á. Hjartarson, S. Bernstein, N. B. Karlsson, S. Fuchs, J. Hartikainen, J. Liakka, R. S. Fausto, D. Dahl-Jensen, A. Bjørk, J.-O. Naslund, F. Mørk, Y. Martos, N. Balling, T. Funck, K. K. Kjeldsen, D. Petersen, U. Gregersen, G. Dam, T. Nielsen, S. A. Khan, and A. Løkkegaard. 2022. "Greenland Geothermal Heat Flow Database and Map (Version 1)." Earth System Science Data 14 (5): 2209-2238 [10.5194/essd-14-2209-2022]

    Kenny, G. G., W. R. Hyde, M. Storey, et al. A. A. Garde, M. J. Whitehouse, P. Beck, L. Johansson, A. S. Søndergaard, A. A. Bjørk, J. A. MacGregor, S. A. Khan, J. Mouginot, B. C. Johnson, E. A. Silber, D. K. Wielandt, K. H. Kjær, and N. K. Larsen. 2022. "A Late Paleocene age for Greenland’s Hiawatha impact structure." Science Advances 8 (10): [10.1126/sciadv.abm2434]

    Silber, E. A., B. C. Johnson, E. Bjonnes, et al. J. A. MacGregor, N. K. Larsen, and S. E. Wiggins. 2021. "Effect of ice sheet thickness on formation of the Hiawatha impact crater." Earth and Planetary Science Letters 566 116972 [10.1016/j.epsl.2021.116972]

    Karlsson, N. B., A. M. Solgaard, K. D. Mankoff, et al. F. Gillet-Chaulet, J. A. MacGregor, J. E. Box, M. Citterio, W. T. Colgan, S. H. Larsen, K. K. Kjeldsen, N. J. Korsgaard, D. I. Benn, I. J. Hewitt, and R. S. Fausto. 2021. "A first constraint on basal melt-water production of the Greenland ice sheet." Nature Communications 12 (1): 3461 [10.1038/s41467-021-23739-z]

    MacGregor, J. A., M. Studinger, E. Arnold, et al. C. J. Leuschen, F. Rodríguez-Morales, and J. D. Paden. 2021. "Brief communication: An empirical relation between center frequency and measured thickness for radar sounding of temperate glaciers." The Cryosphere 15 (6): 2569-2574 [10.5194/tc-15-2569-2021]

    Bessette, J. T., D. M. Schroeder, T. M. Jordan, and J. A. MacGregor. 2021. "Radar‐Sounding Characterization of the Subglacial Groundwater Table Beneath Hiawatha Glacier, Greenland." Geophysical Research Letters 48 (10): [10.1029/2020gl091432]

    MacGregor, J. A., L. N. Boisvert, B. Medley, et al. A. A. Petty, J. P. Harbeck, R. E. Bell, J. B. Blair, E. Blanchard‐Wrigglesworth, E. Buckley, M. S. Christoffersen, J. R. Cochran, B. M. Csathó, E. L. De Marco, R. T. Dominguez, M. A. Fahnestock, S. L. Farrell, S. P. Gogineni, J. S. Greenbaum, C. M. Hansen, M. A. Hofton, J. W. Holt, K. C. Jezek, L. S. Koenig, N. T. Kurtz, R. Kwok, C. F. Larsen, C. J. Leuschen, C. D. Locke, S. S. Manizade, S. Martin, T. A. Neumann, S. M. Nowicki, J. D. Paden, J. A. Richter‐Menge, E. J. Rignot, F. Rodríguez‐Morales, M. R. Siegfried, B. E. Smith, J. G. Sonntag, M. Studinger, K. J. Tinto, M. Truffer, T. P. Wagner, J. E. Woods, D. A. Young, and J. K. Yungel. 2021. "The scientific legacy of NASA's Operation IceBridge." Reviews of Geophysics e2020RG000712 [10.1029/2020rg000712]

    Colgan, W., J. A. MacGregor, K. D. Mankoff, et al. R. Haagenson, H. Rajaram, Y. M. Martos, M. Morlighem, M. A. Fahnestock, and K. K. Kjeldsen. 2021. "Topographic Correction of Geothermal Heat Flux in Greenland and Antarctica." Journal of Geophysical Research: Earth Surface 126 (2): [10.1029/2020jf005598]

    Johnson, J. T., K. C. Jezek, G. Macelloni, et al. M. Brogioni, L. Tsang, E. Dinnat, J. P. Walker, N. Ye, S. Misra, J. R. Piepmeier, R. Bindlish, D. M. Le Vine, P. E. O'Neill, L. Kaleschke, M. Andrews, C. Yardim, M. Aksoy, M. Durand, C.-C. Chen, O. Demir, A. Bringer, J. Z. Miller, S. Brown, R. Kwok, T. Lee, Y. H. Kerr, D. Entekhabi, J. Peng, A. Colliander, S. K. Chan, J. Macgregor, B. C. Medley, R. D. De Roo, and M. Drinkwater. 2021. "Microwave Radiometry at Frequencies from 500 to 1400 MHz: An Emerging Technology for Earth Observations." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 1-1 [10.1109/jstars.2021.3073286]

    Kjeldsen, K. K., S. A. Khan, W. T. Colgan, J. A. MacGregor, and R. S. Fausto. 2020. "Time‐Varying Ice Sheet Mask: Implications on Ice‐Sheet Mass Balance and Crustal Uplift." Journal of Geophysical Research: Earth Surface 125 (12): [10.1029/2020jf005775]

    MacGregor, J. A., M. A. Fahnestock, W. T. Colgan, et al. N. K. Larsen, K. K. Kjeldsen, and J. M. Welker. 2020. "The age of surface-exposed ice along the northern margin of the Greenland Ice Sheet." Journal of Glaciology 66 (258): 667-684 [10.1017/jog.2020.62]

    MacGregor, J. A., W. F. Bottke, M. A. Fahnestock, et al. J. P. Harbeck, K. H. Kjaer, J. D. Paden, D. E. Stillman, and M. Studinger. 2019. "A Possible Second Large Subglacial Impact Crater in Northwest Greenland." Geophysical Research Letters 46 [10.1029/2018gl078126]

    Winebrenner, D. P., P. M. Kintner, and J. A. MacGregor. 2019. "New Estimates of Ice and Oxygen Fluxes Across the Entire Lid of Lake Vostok from Observations of Englacial Radiowave Attenuation." Journal of Geophysical Research: Earth Surface 124 [10.1029/2018jf004692]

    Alley, R. B., D. Pollard, B. R. Parizek, et al. S. Anandakrishnan, M. Pourpoint, N. T. Stevens, J. A. MacGregor, K. Christianson, A. Muto, and N. Holschuh. 2019. "Possible Role for Tectonics in the Evolving Stability of the Greenland Ice Sheet." Journal of Geophysical Research: Earth Surface 124 [10.1029/2018jf004714]

    Kjær, K. H., N. K. Larsen, T. Binder, et al. A. A. Bjørk, O. Eisen, M. A. Fahnestock, S. Funder, A. A. Garde, H. Haack, V. Helm, M. Houmark-Nielsen, K. K. Kjeldsen, S. A. Khan, H. Machguth, I. McDonald, M. Morlighem, J. Mouginot, J. D. Paden, T. E. Waight, C. Weikusat, E. Willerslev, and J. A. MacGregor. 2018. "A large impact crater beneath Hiawatha Glacier in northwest Greenland." Science Advances 4 (11): eaar8173 [10.1126/sciadv.aar8173]

    Kwok, R., N. T. Kurtz, L. Brucker, et al. A. Ivanoff, T. Newman, S. L. Farrell, J. King, S. Howell, M. A. Webster, J. Paden, C. Leuschen, J. A. Macgregor, J. Richter-Menge, J. Harbeck, and M. Tschudi. 2017. "Inter-comparison of snow depth retrievals over Arctic sea ice fromradar data acquired by Operation IceBridge." The Cryosphere 2571-2593 [10.5194/tc-2017-103]

    Scambos, T., R. Bell, R. Alley, et al. S. Anandakrishnan, D. Bromwich, K. Brunt, K. Christianson, T. Creyts, S. Das, R. DeConto, P. Dutrieux, H. Fricker, D. Holland, J. MacGregor, B. Medley, J. Nicolas, D. Pollard, M. Siegfried, A. Smith, E. Steig, L. Trusel, D. Vaughan, and P. Yager. 2017. "How much, how fast?: A science review and outlook for research on the instability of Antarctica's Thwaites Glacier in the 21st century." Global and Planetary Change 153 16-34 [10.1016/j.gloplacha.2017.04.008]

    Koenig, L. S., A. Ivanoff, P. M. Alexander, et al. J. A. MacGregor, X. Fettweis, B. Panzer, J. D. Paden, R. R. Forster, I. Das, J. McConnell, M. Tedesco, C. Leuschen, and P. Gogineni. 2016. "Annual Greenland accumulation rates (2009–2012) from airborne Snow Radar." The Cryosphere 10 1739–1752 [10.5194/tcd-9-6697-2015]

    Colgan, W. T., H. Machguth, M. MacFerrin, et al. J. D. Colgan, D. van As, and J. A. Macgregor. 2016. "The abandoned ice-sheet base at Camp Century, Greenland, in a warming climate." Geophysical Research Letters 43 [10.1002/2016GL069688]

    MacGregor, J. A., M. A. Fahnestock, G. A. Catania, et al. A. Aschwanden, G. D. Clow, W. T. Colgan, P. S. Gogineni, M. Morlighem, S. M. Nowicki, J. D. Paden, S. F. Price, and H. Seroussi. 2016. "A synthesis of the basal thermal state of the Greenland Ice Sheet." J. Geophys. Res. Earth Surf. 121 [10.1002/2015jf003803]

    Cavitte, M. G., D. D. Blankenship, D. A. Young, et al. D. M. Schroeder, F. Parrenin, E. Lemeur, J. A. Macgregor, and M. J. Siegert. 2016. "Deep radiostratigraphy of the East Antarctic plateau: connecting the Dome C and Vostok ice core sites." J. Glaciol. 1-12 [10.1017/jog.2016.11]

    MacGregor, J. A., W. T. Colgan, M. A. Fahnestock, et al. M. Morlighem, G. A. Catania, J. D. Paden, and S. P. Gogineni. 2016. "Holocene deceleration of the Greenland Ice Sheet." Science 351 (6273): 590-593 [10.1126/science.aab1702]

    Grimm, R. E., D. E. Stillman, and J. A. MacGregor. 2015. "Dielectric signatures and evolution of glacier ice." Journal of Glaciology 61 (230): 1159-1170 [10.3189/2015jog15j113]

    MacGregor, J. A., J. Li, J. D. Paden, et al. G. A. Catania, G. D. Clow, M. A. Fahnestock, S. P. Gogineni, R. E. Grimm, M. Morlighem, S. Nandi, H. Seroussi, and D. E. Stillman. 2015. "Radar attenuation and temperature within the Greenland Ice Sheet." J. Geophys. Res. Earth Surf. 120 (6): 983-1008 [10.1002/2014jf003418]

    Brunt, K. M., and J. A. Macgregor. 2015. "What Instruments are Available for Polar Studies?" Eos 96 [10.1029/2015EO026855]

    MacGregor, J. A., M. A. Fahnestock, G. A. Catania, et al. J. D. Paden, S. Prasad Gogineni, S. K. Young, S. C. Rybarski, A. N. Mabrey, B. M. Wagman, and M. Morlighem. 2015. "Radiostratigraphy and age structure of the Greenland Ice Sheet." J. Geophys. Res. Earth Surf. 120 (2): 212-241 [10.1002/2014jf003215]

    Macgregor, J. A., G. A. Catania, H. Conway, et al. D. M. Schroeder, I. Joughin, D. A. Young, S. D. Kempf, and D. D. Blankenship. 2013. "Weak bed control of the eastern shear margin of Thwaites Glacier, West Antarctica." Journal of Glaciology 59 (217): 900-912 [10.3189/2013jog13j050]

    Stillman, D. E., J. A. MacGregor, and R. E. Grimm. 2013. "Electrical response of ammonium-rich water ice." Annals of Glaciology 54 (64): 21-26 [10.3189/2013aog64a204]

    Stillman, D. E., J. A. MacGregor, and R. E. Grimm. 2013. "The role of acids in electrical conduction through ice." J. Geophys. Res. Earth Surf. 118 (1): 1-16 [10.1029/2012jf002603]

    Matsuoka, K., J. A. MacGregor, and F. Pattyn. 2012. "Predicting radar attenuation within the Antarctic ice sheet." Earth and Planetary Science Letters 359-360 173-183 [10.1016/j.epsl.2012.10.018]

    MacGregor, J. A., K. Matsuoka, E. D. Waddington, D. P. Winebrenner, and F. Pattyn. 2012. "Spatial variation of englacial radar attenuation: Modeling approach and application to the Vostok flowline." Journal of Geophysical Research: Earth Surface 117 (F3): [10.1029/2011jf002327]

    Macgregor, J. A., G. A. Catania, M. S. Markowski, and A. G. Andrews. 2012. "Widespread rifting and retreat of ice-shelf margins in the eastern Amundsen Sea Embayment between 1972 and 2011." Journal of Glaciology 58 (209): 458-466 [10.3189/2012jog11j262]

    MacGregor, J. A., S. Anandakrishnan, G. A. Catania, and D. P. Winebrenner. 2011. "The grounding zone of the Ross Ice Shelf, West Antarctica, from ice-penetrating radar." Journal of Glaciology 57 (205): 917-928

    Jacobel, R. W., B. C. Welch, D. Osterhouse, R. Pettersson, and J. A. MacGregor. 2009. "Spatial variation of radar-derived basal conditions on Kamb Ice Stream, West Antarctica." Annals of Glaciology 50 (51): 10-16 [10.3189/172756409789097504]

    MacGregor, J., K. Matsuoka, and M. Studinger. 2009. "Radar detection of accreted ice over Lake Vostok Antarctica." Earth Planet Sci Lett 282 (1-4): 222-233 [10.1016/j.epsl.2009.03.018]

    MacGregor, J., K. Matsuoka, M. Studinger, E. Waddington, and D. Winebrenner. 2009. "Millennially averaged accumulation rates for the Lake Vostok region inferred from deep internal layers." Annals of Glaciology 50 (51): 25-34

    MacGregor, J. A., D. P. Winebrenner, H. Conway, et al. K. Matsuoka, P. A. Mayewski, and G. D. Clow. 2007. "Modeling englacial radar attenuation at Siple Dome, West Antarctica, using ice chemistry and temperature data." Journal of Geophysical Research 112 (F3): F03008 [10.1029/2006jf000717]

    O'Neal, M. A., M. E. O'Mansky, and J. A. MacGregor. 2005. "Modeling the natural degradation of earthworks." Geoarchaeology 20 (7): 739-748 [10.1002/gea.20079]

    Non-Refereed

    Smith, I., W. M. Calvin, D. E. Smith, et al. C. Hansen, S. Diniega, A. McEwen, N. Thomas, D. Banfield, T. N. Titus, P. Becerra, M. Kahre, F. Forget, M. Hecht, S. Byrne, C. S. Hvidberg, P. O. Hayne, J. W. Iii, M. Mellon, B. Horgan, J. Mustard, J. W. Holt, A. Howard, D. McCleese, C. Stoker, P. James, N. E. Putzig, J. Whitten, P. Buhler, A. Spiga, M. Crismani, K. M. Aye, A. Portyankina, R. Orosei, A. Bramson, J. Hanley, M. Sori, O. Aharonson, S. Clifford, H. Sizemore, G. Morgan, B. Hartmann, N. Schorghofer, R. Clark, D. Berman, D. Crown, F. Chuang, M. Siegler, E. N. Dobrea, K. Lynch, R. W. Obbard, M. R. Elmaary, D. Fisher, A. Kleinboehl, M. Balme, B. Schmitt, M. Daly, R. C. Ewing, K. E. Herkenhoff, L. Fenton, S. D. Guzewich, M. Koutnik, J. Levy, R. Massey, A. Łosiak, V. Eke, D. Goldsby, A. Cross, T. Hager, S. Piqueux, A. Kereszturi, K. Seelos, S. Wood, E. Hauber, C. Amos, P. Russell, R. Jaumann, G. Michael, S. Conway, A. Khayat, S. Lewis, G. Luizzi, G. Martinez, K. Mesick, L. Montabone, A. Johnsson, A. Pankine, C. Phillips-Lander, P. Read, L. Edgar, K. Zacny, A. McAdam, A. Rutledge, T. Bertrand, J. Widmer, D. Stillman, A. Soto, Z. Yoldi, R. Young, A. Svensson, L. Sam, M. Landis, A. Bhardwaj, M. Chojnacki, E. Kite, P. Thomas, J. Plaut, J. Bapst, S. Milkovich, J. Whiteway, J. Moores, C. Rezza, R. Karimova, I. Mishev, A. V. Brenen, P. Acharya, J. Chesal, A. Pascuzzo, E. Vos, G. Osinski, C. Andres, C. Neisch, S. Hibbard, P. Sinha, J. P. Knightly, S. Cartwright, S. Kounaves, C. Orgel, M. Skidmore, J. MacGregor, R. Staehle, J. Rabassa, C. Gallagher, A. Coronato, A. G. Galofre, J. Wilson, L. McKeown, N. Oliveira, P. Fawdon, U. Gayathri, C. Stuurman, C. Herny, F. Butcher, F. Bernardini, M. Perry, R. Hu, S. Mukherjee, V. Chevrier, M. E. Banks, T. Meng, P. A. Johnson, B. Tober, J. C. Johnson, S. Ulamsec, J. C. Echaurren, A. Khuller, C. Dinwiddie, S. Adeli, B. L. Henderson, L. R. Lozano, D. Lalich, E. Rivera-Valentín, S. Nerozzi, E. Petersen, F. Foss, R. Lorenz, J. Eigenbrode, M. Day, A. Brown, M. Pajola, Ö. Karatekin, A. Lucchetti, C. Cesar, C. Newman, T. G. Cave, L. Tamppari, M. Mischna, M. Patel, P. Streeter, J. C. Stern, and C. M. Dundas. 2021. "Solar-System-Wide Significance of Mars Polar Science." Vol. 53, Issue 4 (Planetary/Astrobiology Decadal Survey Whitepapers) 53 (4): [10.3847/25c2cfeb.4db95c67]

    MacGregor, J. A. 2014. "Cryosphere: Bottom-up restructuring of ice." Nature Geosci 7 (7): 481-482 [10.1038/ngeo2191]

                                                                                                                                                                                            
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