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Temperature response of Mars to Milankovitch cycles
Author(s) -
Schorghofer Norbert
Publication year - 2008
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2008gl034954
Subject(s) - latitude , mars exploration program , milankovitch cycles , precession , geology , northern hemisphere , atmospheric sciences , range (aeronautics) , southern hemisphere , climatology , astrobiology , physics , geodesy , astronomy , glacial period , paleontology , materials science , composite material
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.