CO2 Sublimation and Jet-Like Activity
Our colleague, Candy Hansen, had the idea of mapping fan structures over the much of the southern polar region of Mars with the help of the general public. This was taken up and implemented in the Zooniverse project, PlanetFour. The project is supported by former Bern post-docs Anya Portyankina and Michael Aye.
Hansen, C.J., S. Byrne, G. Portyankina, M. Bourke, C. Dundas, A. McEwen, M. Mellon, A. Pommerol, and N. Thomas, (2013), Observations of the northern seasonal polar cap on Mars: I. Spring sublimation activity and processes. Icarus, 225, 881-897, doi:10.1016/j.icarus.2012.09.024
Portyankina, G., A. Pommerol, K.-M. Aye, C.J. Hansen, and N. Thomas, (2013), Observations of the Northern seasonal polar cap on Mars II: HiRISE photometric analysis of evolution of northern polar dunes in spring, Icarus, 225, 898-910, doi: 10.1016/j.icarus.2012.10.017.
Pommerol, A., T. Appéré, G. Portyankina, K.?M. Aye, N. Thomas, and C.J. Hansen (2013), Observations of the Northern seasonal polar cap on Mars III: CRISM / HiRISE observations of spring sublimation, Icarus, 225, 911-922, doi:10.1016/j.icarus.2012.08.039
Portyankina, G., A. Pommerol, K.-M. Aye, C.J. Hansen, and N. Thomas, (2012) Polygonal cracks in the seasonal semi-translucent CO2 ice layer in Martian polar areas, J. Geophys. Res. (Planets), 117, Issue E2, CiteID E02006, doi: 10.1029/2011JE003917.
Thomas, N., G. Portyankina, C. J. Hansen, and A. Pommerol (2011), Sub-surface CO2 gas flow in Mars' polar regions: Gas transport under constant production rate conditions, Geophys. Res. Lett., 38, L08203, doi:10.1029/2011GL046797.
Pommerol, A., G. Portyankina, N. Thomas, K.-M. Aye, C.J. Hansen, M. Vincendon, and Y. Langevin, (2011) Evolution of south seasonal cap during Martian spring: insights from highresolution observations by HiRISE and CRISM/MRO, J. Geophys. Res. (Planets), 116, 8007, doi: 10.1029/2010JE003790.
Hansen, C.J., M. Bourke, N.T. Bridges, C. Colon, S. Diniega, C. Dundas, K. Herkenhoff, A. McEwen, M. Mellon, G. Portyankina, and N. Thomas, (2011), Seasonal Erosion and Restoration of Mars’ Northern Polar Dunes, Science, 331, 575-578, doi:10.1126/science.1197636.
Thomas, N., G. Portyankina, C.J. Hansen, and A. Pommerol, (2011), HiRISE observations of gas sublimation-driven activity in Mars' southern polar regions: IV. Fluid dynamics models of CO2 jets, Icarus, 212, 66-85, dx.doi.org/10.1016/j.icarus.2010.12.016
Space Research & Planetary Sciences Division Web Site