DOI: 10.1002/grl.50687
论文题名: Orographic precipitation in valley network headwaters: Constraints on the ancient Martian atmosphere
作者: Scanlon K.E. ; Head J.W. ; Madeleine J.-B. ; Wordsworth R.D. ; Forget F.
刊名: Geophysical Research Letters
ISSN: 0094-8664
EISSN: 1944-8395
出版年: 2013
卷: 40, 期: 16 起始页码: 4182
结束页码: 4187
语种: 英语
英文关键词: atmospheric pressure
; Noachian
; orographic precipitation
; valley networks
Scopus关键词: Global circulation model
; Greenhouse warming
; Local distributions
; Martian atmospheres
; Noachian
; Orographic precipitation
; Transient periods
; Valley network
; Atmospheric pressure
; Carbon dioxide
; Computer simulation
; Snow
; Landforms
; atmospheric modeling
; atmospheric pressure
; carbon dioxide
; global warming
; greenhouse gas
; headwater
; Mars
; Martian atmosphere
; numerical model
; orography
; precipitation (climatology)
; snowpack
; topography
英文摘要: We examine the Martian valley networks in the framework of topographic influences on precipitation. We use an analytical model and the Laboratoire de Météorologie Dynamique (LMD) early Mars global circulation model (GCM) to explore the local-scale distribution of orographically forced precipitation as a function of atmospheric pressure. In simulations with 500 mbar and 1 bar CO2 atmospheres, orographic lifting results in enhanced snowfall upslope of the observed valley network tributaries. Our framework also suggests that a 2 bar atmosphere cannot create the observed valley pattern at the highest-relief valley network, Warrego Valles. As in previous work, the GCM does not generate temperatures warm enough for rain or significant snowmelt in the highlands with CO2 greenhouse warming alone. Thus while transient periods of unusual warming are still required to melt the deposits and carve the valleys, our model predicts snow deposition in the correct locations. Key Points A model is used to predict the local distribution of snowfall on early Mars Melting these snowpacks would have created the observed distribution of valleys A 2-bar model atmosphere cannot reproduce the distribution of Warrego Valles. © 2013. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883076006&doi=10.1002%2fgrl.50687&partnerID=40&md5=f249e3942dbf4aba99efe9c93cfbfb03
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5928
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geological Sciences, Brown University, 324 Brook St., Providence, RI 02912, United States
Recommended Citation:
Scanlon K.E.,Head J.W.,Madeleine J.-B.,et al. Orographic precipitation in valley network headwaters: Constraints on the ancient Martian atmosphere[J]. Geophysical Research Letters,2013-01-01,40(16).