James Roberts Print


  89133

  James.Roberts@jhuapl.edu

: SES

:   Planetary Geophysicist

:  Planetary

  Europa Mission, Gravity Science, New Horizons, LORRI, OSIRIS-REx, OLA

 
2006, Ph.D. in Astrophysical, Planetary, and Atmospheric Sciences, University of Colorado
2003, M.S. in Astrophysical, Planetary, and Atmospheric Sciences, University of Colorado
2001, B.S. in Physics, Virginia Polytechnic Institute and State University
2001, B. S. in Geological Sciences, Virginia Polytechnic Institute and State University

My goal is to understand why the various planets and moons of the solar system look the way they do now, what they were like early in their history, and how they evolved to their present state.  I approach these questions this by modeling large-scale geodynamics of terrestrial planets and icy satellites.  I am primarily concerned with:

  • Sources of heat in planetary interiors, tidal dissipation, radioactive decay, and impacts.
  • Solid-state convection and the removal of heat from planetary interiors.
  • Surface features and mass anomalies generated by geodynamic processes, and their effect on planetary reorientation.
  • The relationship between the thermal and orbital evolution of planets and moons.

The models are developed with the goal of explaining specific surface observations of targeted planetary bodies (e.g. Mars or Enceladus), but with appropriate parameters can be applied to planetary bodies in general.

 
AGU Index Category AGU Index Sub-Category
PLANETARY SCIENCES: SOLID SURFACE PLANETS Interiors
PLANETARY SCIENCES: SOLID SURFACE PLANETS Orbital and rotational dynamics
PLANETARY SCIENCES: SOLID SURFACE PLANETS Tectonics
GEODESY AND GRAVITY Lunar and planetary geodesy and gravity
PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS Mars
PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS Enceladus
PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS Mercury
PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS Europa
PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS Asteroids
PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS Pluto and satellites
:
2011 - Present
Senior Professional Staff, Planetary Exploration Group, Johns Hopkins University Applied Physics Lab
2008 - 2011
Postdoctoral Fellow, Planetary Exploration Group, Johns Hopkins University Applied Physics Lab
2011 - Present
Adjunct Research Assistant Professor, Department of Geology, University of Maryland
2010 - 2014
Assistant Research Professor, Department of Earth and Planetary Science, Johns Hopkins University
2006 - 2008
Postdoctoral Scholar, Department of Earth and Planetary Science, University of California, Santa Cruz
2008 - 2008
Lecturer, Department of Earth and Planetary Science, University of California, Santa Cruz
2001 - Present
American Geophysical Union
2012 - Present
Division of Planetary Sciences (affiliate)
2014 - Present
Geological Society of America
2009 - Present
Outer Planets Assessment Group
2011: Editor’s Citation for Excellence in Refereeing, American Geophysical Union
2010: Johns Hopkins University Applied Physics Laboratory Publication Award
2004-2005: “Best Should Teach” Silver Award, Graduate Teacher Program, University of Colorado
2001-2003: Supplemental Fellowships, Department of Astrophysics and Planetary Science, University of Colorado
:
The following publication information was downloaded from http://www.researcherId.com/rid/I-9030-2012. Click on the publication title to view details.
Convection in a volatile nitrogen-ice-rich layer drives Pluto's geological vigour
:   McKinnon, William B.; Nimmo, Francis; Wong, Teresa; Schenk, Paul M.; White, Oliver L.; Roberts, J. H.; Moore, J. M.; Spencer, J. R.; Howard, A. D.; Umurhan, O. M.; Stern, S. A.; Weaver, H. A.; Olkin, C. B.; Young, L. A.; Smith, K. E.; New Horizons Geology Geophys
:JUN 2 2016
: Nature
  534
  82
  +
: WOS:000376962300037
: None
The low-degree shape of Mercury
:   Perry, Mark E.; Neumann, Gregory A.; Phillips, Roger J.; Barnouin, Olivier S.; Ernst, Carolyn M.; Kahan, Daniel S.; Solomon, Sean C.; Zuber, Maria T.; Smith, David E.; Hauck, Steven A., II; Peale, Stanton J.; Margot, Jean-Luc; Mazarico, Erwan; Johnson, Catherine L.; Gaskell, Robert W.; Roberts, James H.; McNutt, Ralph L., Jr.; Oberst, Juergen
:SEP 16 2015
: Geophysical Research Letters
  42
  6951
  6958
: WOS:000363411200011
: None
The fluffy core of Enceladus
:   Roberts, James H.
:SEP 15 2015
: Icarus
  258
  54
  66
: WOS:000359095300007
: None
The Pluto system: Initial results from its exploration by New Horizons
:   Stern, S. A.; Bagenal, F.; Ennico, K.; Gladstone, G. R.; Grundy, W. M.; McKinnon, W. B.; Moore, J. M.; Olkin, C. B.; Spencer, J. R.; Weaver, H. A.; Young, L. A.; Andert, T.; Andrews, J.; Banks, M.; Bauer, B.; Bauman, J.; Barnouin, O. S.; Bedini, P.; Beisser, K.; Beyer, R. A.; Bhaskaran, S.; Binzel, R. P.; Birath, E.; Bird, M.; Bogan, D. J.; Bowman, A.; Bray, V. J.; Brozovic, M.; Bryan, C.; Buckley, M. R.; Buie, M. W.; Buratti, B. J.; Bushman, S. S.; Calloway, A.; Carcich, B.; Cheng, A. F.; Conard, S.; Conrad, C. A.; Cook, J. C.; Cruikshank, D. P.; Custodio, O. S.; Ore, C. M. Dalle; Deboy, C.; Dischner, Z. J. B.; Dumont, P.; Earle, A. M.; Elliott, H. A.; Ercol, J.; Ernst, C. M.; Finley, T.; Flanigan, S. H.; Fountain, G.; Freeze, M. J.; Greathouse, T.; Green, J. L.; Guo, Y.; Hahn, M.; Hamilton, D. P.; Hamilton, S. A.; Hanley, J.; Harch, A.; Hart, H. M.; Hersman, C. B.; Hill, A.; Hill, M. E.; Hinson, D. P.; Holdridge, M. E.; Horanyi, M.; Howard, A. D.; Howett, C. J. A.; Jackman, C.; Jacobson, R. A.; Jennings, D. E.; Kammer, J. A.; Kang, H. K.; Kaufmann, D. E.; Kollmann, P.; Krimigis, S. M.; Kusnierkiewicz, D.; Lauer, T. R.; Lee, J. E.; Lindstrom, K. L.; Linscott, I. R.; Lisse, C. M.; Lunsford, A. W.; Mallder, V. A.; Martin, N.; McComas, D. J.; McNutt, R. L., Jr.; Mehoke, D.; Mehoke, T.; Melin, E. D.; Mutchler, M.; Nelson, D.; Nimmo, F.; Nunez, J. I.; Ocampo, A.; Owen, W. M.; Paetzold, M.; Page, B.; Parker, A. H.; Parker, J. W.; Pelletier, F.; Peterson, J.; Pinkine, N.; Piquette, M.; Porter, S. B.; Protopapa, S.; Redfern, J.; Reitsema, H. J.; Reuter, D. C.; Roberts, J. H.; Robbins, S. J.; Rogers, G.; Rose, D.; Runyon, K.; Retherford, K. D.; Ryschkewitsch, M. G.; Schenk, P.; Schindhelm, E.; Sepan, B.; Showalter, M. K.; Singer, K. N.; Soluri, M.; Stanbridge, D.; Steffl, A. J.; Strobel, D. F.; Stryk, T.; Summers, M. E.; Szalay, J. R.; Tapley, M.; Taylor, A.; Taylor, H.; Throop, H. B.; Tsang, C. C. C.; Tyler, G. L.; Umurhan, O. M.; Verbiscer, A. J.; Versteeg, M. H.; Vincent, M.; Webber, R.; Weidner, S.; Weigle, G. E., II; White, O. L.; Whittenburg, K.; Williams, B. G.; Williams, K.; Williams, S.; Woods, W. W.; Zangari, A. M.; Zirnstein, E.
:OCT 16 2015
: Science
  350
  292
  +
: WOS:000362838700032
: None
Could giant basin-forming impacts have killed Martian dynamo?
:   Kuang, W.; Jiang, W.; Roberts, J.; Frey, H. V.
:NOV 28 2014
: Geophysical Research Letters
  41
  8006
  8012
: WOS:000346644600032
: None
Impact heating and coupled core cooling and mantle dynamics on Mars
:   Roberts, James H.; Arkani-Hamed, Jafar
:APR 2014
: Journal of Geophysical Research-Planets
  119
  729
  744
: WOS:000336215000002
: None
Observational bias and the apparent distribution of ponds on Eros
:   Roberts, James H.; Barnouin, Olivier S.; Kahn, Eliezer G.; Prockter, Louise M.
:OCT 2014
: Icarus
  241
  160
  164
: WOS:000343617900011
: None
Origin and flatness of ponds on asteroid 433 Eros
:   Roberts, James H.; Kahn, Eliezer G.; Barnouin, Olivier S.; Ernst, Carolyn M.; Prockter, Louise M.; Gaskell, Robert W.
:OCT 2014
: Meteoritics & Planetary Science
  49
  1735
  1748
: WOS:000343972000001
: None
Convection-driven compaction as a possible origin of Enceladus's long wavelength topography
:   Besserer, J.; Nimmo, F.; Roberts, J. H.; Pappalardo, R. T.
:MAY 2013
: Journal of Geophysical Research-Planets
  118
  908
  915
: WOS:000324912400003
: None
Thermal evolution of Mercury as constrained by MESSENGER observations
:   Michel, Nathalie C.; Hauck, Steven A., II; Solomon, Sean C.; Phillips, Roger J.; Roberts, James H.; Zuber, Maria T.
:MAY 2013
: Journal of Geophysical Research-Planets
  118
  1033
  1044
: WOS:000324912400012
: None
Subcontinental sinking slab remnants in a spherical geometry mantle model
:   Quere, S.; Lowman, J. P.; Arkani-Hamed, J.; Roberts, J. H.; Moucha, R.
:APR 2013
: Journal of Geophysical Research-Solid Earth
  118
  1760
  1777
: WOS:000319926600027
: None
Sustainability of a subsurface ocean within Triton's interior
:   Gaeman, Jodi; Hier-Majumder, Saswata; Roberts, James H.
:AUG 2012
: Icarus
  220
  339
  347
: WOS:000308057200005
: None
Impact-induced mantle dynamics on Mars
:   Roberts, James H.; Arkani-Hamed, Jafar
:MAR 2012
: Icarus
  218
  278
  289
: WOS:000301637700021
: None
The effect of the Caloris impact on the mantle dynamics and volcanism of Mercury
:   Roberts, James H.; Barnouin, Olivier S.
:FEB 16 2012
: Journal of Geophysical Research-Planets
  117
  --
  --
: WOS:000300826500001
: None
Impact basin relaxation at Iapetus
:   Robuchon, Guillaume; Nimmo, Francis; Roberts, James; Kirchoff, Michelle
:JUL 2011
: Icarus
  214
  82
  90
: WOS:000292853600007
: None
Exposure of spectrally distinct material by impact craters on Mercury: Implications for global stratigraphy
:   Ernst, Carolyn M.; Murchie, Scott L.; Barnouin, Olivier S.; Robinson, Mark S.; Denevi, Brett W.; Blewett, David T.; Head, James W.; Izenberg, Noam R.; Solomon, Sean C.; Roberts, James H.
:SEP 2010
: Icarus
  209
  210
  223
: WOS:000281687800017
: None
Giant impacts on early Mars and the cessation of the Martian dynamo
:   Roberts, J. H.; Lillis, R. J.; Manga, M.
:APR 23 2009
: Journal of Geophysical Research-Planets
  114
  --
  --
: WOS:000265537600002
: None
Near-surface heating on Enceladus and the south polar thermal anomaly
:   Roberts, J. H.; Nimmo, F.
:MAY 3 2008
: Geophysical Research Letters
  35
  --
  --
: WOS:000255593400005
: None
Tidal heating and the long-term stability of a subsurface ocean on Enceladus
:   Roberts, James H.; Nimmo, Francis
:APR 2008
: Icarus
  194
  675
  689
: WOS:000254685900021
: None
The cause for the north-south orientation of the crustal dichotomy and the equatorial location of Tharsis on Mars
:   Roberts, James H.; Zhong, Shijie
:SEP 2007
: Icarus
  190
  24
  31
: WOS:000249025300003
: None
Supercontinent cycles, true polar wander, and very long-wavelength mantle convection
:   Zhong, Shijie; Zhang, Nan; Li, Zheng-Xiang; Roberts, James H.
:SEP 30 2007
: Earth and Planetary Science Letters
  261
  551
  564
: WOS:000250189400017
: None
Degree-1 convection in the Martian mantle and the origin of the hemispheric dichotomy
:   Roberts, JH; Zhong, SJ
:JUN 23 2006
: Journal of Geophysical Research-Planets
  111
  --
  --
: WOS:000238600800003
: None
Plume-induced topography and geoid anomalies and their implications for the Tharsis rise on Mars
:   Roberts, JH; Zhong, SJ
:MAR 20 2004
: Journal of Geophysical Research-Planets
  109
  --
  --
: WOS:000220439100002
: None
On the support of the Tharsis Rise on Mars
:   Zhong, SJ; Roberts, JH
:SEP 10 2003
: Earth and Planetary Science Letters
  214
  1
  9
: WOS:000185325400001
: None
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