DOI: 10.1038/NGEO3043
论文题名: Regional patterns of extreme precipitation on Titan consistent with observed alluvial fan distribution
作者: Faulk S.P. ; Mitchell J.L. ; Moon S. ; Lora J.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 11 起始页码: 827
结束页码: 831
语种: 英语
Scopus关键词: alluvial fan
; bedrock
; climate modeling
; extreme event
; geomorphology
; grain size
; hydrometeorology
; methane
; precipitation (climatology)
; regional climate
; sediment transport
; spatial distribution
; Titan
英文摘要: Geomorphic features typically associated with extreme rainfall events in terrestrial settings, including extensive fluvial features and alluvial fans, have been detected on Titan's surface. Methane flow from precipitation on Titan can transport sediments and potentially Erode the icy bedrock, but averaged precipitation rates from prior global-scale modelling are too low by at least an order of magnitude to initiate sediment transport of observed grain sizes at low latitudes. Here, we quantify the regional magnitude, frequency and variability of extreme rainfall events from simulations of present-day Titan, with a general circulation model coupled to a land model partially covered by wetlands reservoirs that can capture Titan's regionally varying hydroclimate. We find that the most extreme storms tend to occur in the mid-latitudes, where observed alluvial fans are most concentrated. Storms capable of sediment transport and erosion occur at all latitudes in our simulations, consistent with the observed global coverage of fluvial features. Our results demonstrate the influential role of extreme precipitation in shaping Titan's surface. We therefore suggest that, similarly to Earth but dierently from Mars, active geomorphic work may be ongoing in the present climate on Titan. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105673
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Earth, Planetary, and Space Sciences, University of California Los Angeles, Los Angeles, CA, United States
Recommended Citation:
Faulk S.P.,Mitchell J.L.,Moon S.,et al. Regional patterns of extreme precipitation on Titan consistent with observed alluvial fan distribution[J]. Nature Geoscience,2017-01-01,10(11)