气候变化领域集成服务门户(CCPortal): Environmental effects of large impacts on Mars

CCPortal

DOI	10.1126/science.1073586
	Environmental effects of large impacts on Mars
	Segura T.L.; Toon O.B.; Colaprete A.; Zahnle K.
发表日期	2002
ISSN	0036-8075
起始页码	1977
结束页码	1980
卷号	298 期号:5600
英文摘要	The martian valley networks formed near the end of the period of heavy bombardment of the inner solar system, about 3.5 billion years ago. The largest impacts produced global blankets of very hot ejecta, ranging in thickness from meters to hundreds of meters. Our simulations indicated that the ejecta warmed the surface, keeping it above the freezing point of water for periods ranging from decades to millennia, depending on impactor size, and caused shallow subsurface or polar ice to evaporate or melt. Large impacts also injected steam into the atmosphere from the craters or from water innate to the impactors. From all sources, a typical 100-, 200-, or 250-kilometers asteroid injected about 2, 9, or 16 meters, respectively, of precipitable water into the atmosphere, which eventually rained out at a rate of about 2 meters per year. The rains from a large impact formed rivers and contributed to recharging aquifers.
英文关键词	Aquifers; Computer simulation; Environmental impact; Extraterrestrial atmospheres; Freezing; Ice; Melting; Solar system; Water; Impactor sizes; Martian surface analysis; environmental effect; impact; Mars; planetary atmosphere; valley; article; astronomy; atmosphere; environmental change; evaporation; freezing; greenhouse effect; melting point; precipitation; priority journal; river; simulation; Atmosphere; Carbon Dioxide; Computer Simulation; Exobiology; Extraterrestrial Environment; Ice; Life; Mars; Minor Planets; Temperature; Water; Asteroidea
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/245413
作者单位	Prog. in Atmosph. and Oceanic Sci., Laboratory for Space Physics, University of Colorado, Boulder, CO 80309-0392, United States; NASA-Ames Research Center, MS 245-3, Moffett Field, CA 94035, United States
推荐引用方式 GB/T 7714	Segura T.L.,Toon O.B.,Colaprete A.,et al. Environmental effects of large impacts on Mars[J],2002,298(5600).
APA	Segura T.L.,Toon O.B.,Colaprete A.,&Zahnle K..(2002).Environmental effects of large impacts on Mars.Science,298(5600).
MLA	Segura T.L.,et al."Environmental effects of large impacts on Mars".Science 298.5600(2002).