RESONANT OBLIQUITY OF MARS

被引:36
作者
WARD, WR [1 ]
RUDY, DJ [1 ]
机构
[1] SAN JUAN CAPISTRANO RES INST,SAN JUAN CAPISTRANO,CA
关键词
D O I
10.1016/0019-1035(91)90146-K
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The obliquity of Mars executes large-scale oscillations as a result of spin axis and orbit plane precessions. This motion is an important driver of the climate system and exhibits two dominant periodicities: (i) oscillations driven by the differential spin axis and orbit precession rates during which the obliquity may change by ≳20° over ∼105 years and (ii) amplitude modulations over ∼106 years due to changes in the orbital inclination. This paper discusses a third time scale for change involving a possible spin-orbit resonance. New work on secular orbit theory implies that Mars may have passed through such a resonance recently. The mechanism typically operates on a 107-year time scale and suggests an increase in the average obliquity of Mars of nearly 15° only ∼5 × 106 years ago. This could have important implications for the planet's climatic history. © 1991.
引用
收藏
页码:160 / 164
页数:5
相关论文
共 24 条
[11]  
KAULA WM, 1979, GEOPHYS RES LETT, V6, P194, DOI 10.1029/GL006i003p00194
[12]   A NUMERICAL EXPERIMENT ON THE CHAOTIC BEHAVIOR OF THE SOLAR-SYSTEM [J].
LASKAR, J .
NATURE, 1989, 338 (6212) :237-238
[13]   THE CHAOTIC MOTION OF THE SOLAR-SYSTEM - A NUMERICAL ESTIMATE OF THE SIZE OF THE CHAOTIC ZONES [J].
LASKAR, J .
ICARUS, 1990, 88 (02) :266-291
[14]  
LASKAR J, 1988, ASTRON ASTROPHYS, V198, P341
[15]   GENERALIZED CASSINIS LAWS [J].
PEALE, SJ .
ASTRONOMICAL JOURNAL, 1969, 74 (03) :483-&
[16]   MARTIAN VALLEYS - MORPHOLOGY, DISTRIBUTION, AGE, AND ORIGIN [J].
PIERI, DC .
SCIENCE, 1980, 210 (4472) :895-897
[17]   QUASI-PERIODIC CLIMATE CHANGES ON MARS - A REVIEW [J].
POLLACK, JB ;
TOON, OB .
ICARUS, 1982, 50 (2-3) :259-287
[18]   THE ASTRONOMICAL THEORY OF CLIMATIC-CHANGE ON MARS [J].
TOON, OB ;
POLLACK, JB ;
WARD, W ;
BURNS, JA ;
BILSKI, K .
ICARUS, 1980, 44 (03) :552-607
[19]   PAST OBLIQUITY OSCILLATIONS OF MARS - ROLE OF THE THARSIS UPLIFT [J].
WARD, WR ;
BURNS, JA ;
TOON, OB .
JOURNAL OF GEOPHYSICAL RESEARCH, 1979, 84 (NB1) :243-259
[20]   PRESENT OBLIQUITY OSCILLATIONS OF MARS - FOURTH-ORDER ACCURACY IN ORBITAL E AND I [J].
WARD, WR .
JOURNAL OF GEOPHYSICAL RESEARCH, 1979, 84 (NB1) :237-241