气候变化领域集成服务门户(CCPortal): Seasonal variations of snow depth on mars

CCPortal

DOI	10.1126/science.1066556
	Seasonal variations of snow depth on mars
	Smith D.E.; Zuber M.T.; Neumann G.A.
发表日期	2001
ISSN	0036-8075
起始页码	2141
结束页码	2146
卷号	294 期号:5549
英文摘要	Using topography collected over one martian years from the Mars Orbiter Laser Altimeter on the Mars Global Surveyor (MGS) spacecraft, we have measured temporal changes in the elevation of the martian surface that correlate with the seasonal cycle of carbon dioxide exchange between the surface and atmosphere. The greatest elevation change (1.5 to 2 meters) occurs at high latitudes (above 80°), whereas the bulk of the mass exchange occurs at lower latitudes (below 75° N and below 73° S). An unexpected period of sublimation was observed during northern hemisphere autumn, coincident with dust storms in the southern hemisphere. Analysis of MGS Doppler tracking residuals revealed temporal variations in the flattening of Mars that correlate with elevation changes. The combined changes in gravity and elevation constrain the average density of seasonally deposited carbon dioxide to be 910 ± 230 kilograms per cubic meter, which is considerably denser than terrestrial snow.
英文关键词	Carbon dioxide; Snow; Spacecraft; Sublimation; Surveying; Tracking (position); Seasonal cycle; Topography; Martian surface analysis; carbon dioxide; snow; carbon dioxide; depth; Mars; seasonal variation; snow; topography; altitude; article; astronomy; atmosphere; density; Doppler echography; dust; gravity; mass; measurement; priority journal; seasonal variation; surface property; Atmosphere; Carbon Dioxide; Dry Ice; Extraterrestrial Environment; Gravitation; Mars; Seasons; Temperature
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/245520
作者单位	Laboratory for Terrestrial Physics, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, United States
推荐引用方式 GB/T 7714	Smith D.E.,Zuber M.T.,Neumann G.A.. Seasonal variations of snow depth on mars[J],2001,294(5549).
APA	Smith D.E.,Zuber M.T.,&Neumann G.A..(2001).Seasonal variations of snow depth on mars.Science,294(5549).
MLA	Smith D.E.,et al."Seasonal variations of snow depth on mars".Science 294.5549(2001).