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Temperature response of Mars to Milankovitch cycles
Institute for Astronomy, University of Hawaii at Manoa, Honolulu, Hawaii, USA
On Mars annual mean surface temperature near ±60° latitude varies predominately with precession and is not closely related to annual mean insolation. Based on the last few million years of orbital history, the precession cycle dominates in a narrow latitude range 54°–65°, in which the margins of the two ice-rich permafrost layers in each hemisphere happen to lie, while mean annual temperature at other latitudes is controlled by the obliquity cycle. The phenomenon already exists on an airless uniform body in Mars orbit, where this latitude range shifts to 62°–74° on both hemispheres, and is closely related to temperature amplitude dependent reradiation into space.
Received 7 June 2008; accepted 14 August 2008; published 23 September 2008.
Citation: (2008), Temperature response of Mars to Milankovitch cycles, Geophys. Res. Lett., 35, L18201, doi:10.1029/2008GL034954.
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