Global dust storm signal in the meteorological excitation of Mars' rotation

	Global dust storm signal in the meteorological excitation of Mars' rotation
	Zhou, Y. H.1; Salstein, D. A.2; Xu, X. Q.1; Liao, X. H.1
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
	2013-05-01
卷号	118 期号:5 页码:952-962
关键词	Mars' rotation global dust storm excitation seasonal variations diurnal and semidiurnal variations
英文摘要	The meteorological excitation of Mars' rotation refers to the change of Mars' orientation parameters caused by meteorological processes, e.g., that portion due to variations of atmospheric circulation and surface pressure, and a cryospheric part due to the variable Martian polar ice caps associated with the CO2 sublimation/condensation effects. Global dust storms (GDSs) are unique meteorological events on Mars that cause changes in surface pressure, polar caps extent, and circulation patterns on a global scale, which in turn alter Mars' rotation under the conservation of Mars' total angular momentum. In this paper, the GDS signal in the meteorological excitation of Mars' rotation is investigated on seasonal, diurnal, and semidiurnal time scales, based on the Martian Climate Database. On seasonal scales, the cryospheric excitation plays a less important role in general, due to its location at high latitudes, than its atmospheric counterpart. The GDS brings (-3%, +15%) changes in the amplitude of annual polar motion and length-of-day (LOD) variation and (+22%, -34%) changes in the amplitude of semiannual polar motion and LOD variation. On diurnal and semidiurnal scales, the cryospheric excitation can be fully neglected in comparison to its atmospheric counterpart. A significant GDS signal is found with respect to the diurnal polar motion and semidiurnal LOD excitation variation, because of strong atmospheric tides arising from GDS effects. The amplitude increases in diurnal polar motion and semidiurnal LOD variation during some periods of the Martian year may reach 3-5 times as large as those during the same stage in a typical Martian year.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geochemistry & Geophysics
研究领域[WOS]	Geochemistry & Geophysics
关键词[WOS]	GENERAL-CIRCULATION MODEL ; SEASONAL MASS REDISTRIBUTION ; ANGULAR-MOMENTUM ; MARTIAN ATMOSPHERE ; SURFACE PRESSURE ; INTERANNUAL VARIABILITY ; INTERIOR STRUCTURE ; THERMAL TIDES ; CO2 EXCHANGE ; GRAVITY
收录类别	SCI
语种	英语
WOS记录号	WOS:000324912400007
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18021]
专题	上海天文台_天文地球动力学研究中心
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Atmospher & Environm Res Inc, Lexington, MA USA
推荐引用方式 GB/T 7714	Zhou, Y. H.,Salstein, D. A.,Xu, X. Q.,et al. Global dust storm signal in the meteorological excitation of Mars' rotation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,2013,118(5):952-962.
APA	Zhou, Y. H.,Salstein, D. A.,Xu, X. Q.,&Liao, X. H..(2013).Global dust storm signal in the meteorological excitation of Mars' rotation.JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,118(5),952-962.
MLA	Zhou, Y. H.,et al."Global dust storm signal in the meteorological excitation of Mars' rotation".JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 118.5(2013):952-962.