The North Polar Layered Deposits (NPLD) of Mars contain a complex stratigraphy that has been suggested to retain a record of past eccentricity- and obliquity-forced climate changes. The surface accumulation rate in the current climate can be constrained by the crater retention age. We scale NPLD crater diameters to account for icy target strength and compare surface age using a new production function for recent small impacts on Mars to the previously used model of Hartmann (2005). Our results indicate that ice is accumulating in these craters several times faster than previously thought, with a 100m diameter crater being completely infilled within centuries. Craters appear to have a diameter-dependent lifetime, but the data also permit a complete resurfacing of the NPLD at similar to 1.5 ka.
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Univ Texas Austin, Jackson Sch Geosci, Austin, TX 78712 USAUniv Texas Austin, Jackson Sch Geosci, Austin, TX 78712 USA
Christian, S.
Holt, J. W.
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Univ Texas Austin, Jackson Sch Geosci, Austin, TX 78712 USAUniv Texas Austin, Jackson Sch Geosci, Austin, TX 78712 USA
Holt, J. W.
Byrne, S.
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Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85745 USAUniv Texas Austin, Jackson Sch Geosci, Austin, TX 78712 USA
Byrne, S.
Fishbaugh, K. E.
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Smithsonian Natl Air & Space Museum, Ctr Earth & Planetary Studies, Washington, DC 20013 USAUniv Texas Austin, Jackson Sch Geosci, Austin, TX 78712 USA
机构:
Univ Colorado, Astrophys & Planetary Sci, Boulder, CO 80309 USA
Lab Atmospher & Space Phys, Boulder, CO 80303 USAUniv Colorado, Astrophys & Planetary Sci, Boulder, CO 80309 USA
Wilcoski, A. X.
Hayne, P. O.
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Univ Colorado, Astrophys & Planetary Sci, Boulder, CO 80309 USA
Lab Atmospher & Space Phys, Boulder, CO 80303 USAUniv Colorado, Astrophys & Planetary Sci, Boulder, CO 80309 USA
机构:
SW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Washington Univ, Dept Earth & Planetary Sci, St Louis, MO 63130 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Phillips, Roger J.
Davis, Brian J.
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SW Res Inst, Dept Space Studies, Boulder, CO 80302 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Davis, Brian J.
Tanaka, Kenneth L.
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US Geol Survey, Astrogeol Sci Ctr, Flagstaff, AZ 86001 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Tanaka, Kenneth L.
Byrne, Shane
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Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Byrne, Shane
Mellon, Michael T.
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Univ Colorado, Atmospher & Space Phys Lab, Boulder, CO 80303 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Mellon, Michael T.
Putzig, Nathaniel E.
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SW Res Inst, Dept Space Studies, Boulder, CO 80302 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Putzig, Nathaniel E.
Haberle, Robert M.
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NASA, Ames Res Ctr, Space Sci & Astrobiol Div, Moffett Field, CA 94035 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Haberle, Robert M.
Kahre, Melinda A.
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NASA, Ames Res Ctr, Bay Area Environm Res Inst, Moffett Field, CA 94035 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Kahre, Melinda A.
Campbell, Bruce A.
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Smithsonian Inst, Ctr Earth & Planetary Studies, Washington, DC 20013 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Campbell, Bruce A.
Carter, Lynn M.
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NASA, Goddard Space Flight Ctr, Sci & Explorat Directorate, Greenbelt, MD 20771 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Carter, Lynn M.
Smith, Isaac B.
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Univ Texas Austin, Jackson Sch Geosci, Inst Geophys, Austin, TX 78758 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Smith, Isaac B.
Holt, John W.
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Univ Texas Austin, Jackson Sch Geosci, Inst Geophys, Austin, TX 78758 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Holt, John W.
Smrekar, Suzanne E.
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CALTECH, Jet Prop Lab, Pasadena, CA 91109 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Smrekar, Suzanne E.
Nunes, Daniel C.
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CALTECH, Jet Prop Lab, Pasadena, CA 91109 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Nunes, Daniel C.
Plaut, Jeffrey J.
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CALTECH, Jet Prop Lab, Pasadena, CA 91109 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Plaut, Jeffrey J.
Egan, Anthony F.
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机构:
SW Res Inst, Dept Space Operat, Boulder, CO 80302 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Egan, Anthony F.
Titus, Timothy N.
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US Geol Survey, Astrogeol Sci Ctr, Flagstaff, AZ 86001 USASW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA
Titus, Timothy N.
Seu, Roberto
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机构:
Univ Roma La Sapienza, Dept Informat Engn Elect & Telecommun, I-00184 Rome, ItalySW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA