edu.ucar.opensky::articles:23637 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T14:53:34.739416 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7668hgk New and recent gully activity on Mars as seen by HiRISE 2010-04-07T00:00:00Z publication https://n2t.org/ark:/85065/d7668hgk https://doi.org/10.1029/2009GL041351 Dundas, C. M. author McEwen, A. S. author Diniega, S. author Byrne, S. author Martínez-Alonso, Sara-Eva author UCAR/NCAR - Library publisher Fresh-appearing gully deposits are found at tens of sites in the southern hemisphere of Mars. These deposits have latitudinal and azimuthal dependences similar to the overall preferences of southern-hemisphere gullies, suggesting that most gullies can undergo such events. Definite changes are seen at ten sites, including two previously reported. These include visible modification of gully channels and aprons. Those formation intervals constrained to better than one Mars year tend to include winter and exclude summer, suggesting seasonal activity. This seasonal activity is consistent with proposed models for gully formation driven by CO2 frost, although at least some of the new deposits are probably due to dry granular flow with no volatile involvement. As these deposits are capable of effecting distinct topographic changes to gully aprons and channels, they represent a significant component of recent gully evolution. Citation: Dundas, C. M., A. S. McEwen, S. Diniega, and S. Byrne ( 2010), New and recent gully activity on Mars as seen by HiRISE, Geophys. Res. Lett., 37, L07202, doi: 10.1029/2009GL041351. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2010 American Geophysical Union. None eng geoscientificInformation