Orographic precipitation in valley network headwaters: Constraints on the ancient Martian atmosphere
نویسندگان
چکیده
منابع مشابه
Photochemical instability of the ancient Martian atmosphere
[1] We develop a 1-D steady state photochemical model of the modern Martian atmosphere and apply it to possible Martian atmospheres present and past. A unique feature of our model is that the major current sink of oxygen is dry deposition (surface reactions) of highly reactive, oxidized molecules (chiefly H2O2), rather than oxygen escape to space. Another difference is that we allow hydrogen to...
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■ Abstract The influence of surface orography on patterns of precipitation gives rise to some of the most pronounced climate gradients on Earth, and plays a fundamental role in the interaction between the atmosphere and the rest of the Earth System on a wide variety of time scales. The physical mechanisms involved comprise a rich set of interactions encompassing fluid dynamics, thermodynamics, ...
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Department of Geology and Geophysics, Yale University, New Haven, Connecticut; KirShbaum—Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, Quebec, Canada; Warren—Department of Meteorology, University of Reading, Reading, United Kingdom; lareau—Department of Atmospheric Sciences, University of Utah, Salt Lake City, Utah; Palany—Météo-France, Martinique; JameS—Forestry ...
متن کاملNew Martian valley network volume estimate consistent with ancient ocean and warm and wet climate
The volume of Martian valley network (VN) cavity and the amount of water needed to create the cavity by erosion are of significant importance for understanding the early Martian climate, the style and rate of hydrologic cycling, and the possibility of an ancient ocean. However, previous attempts at estimating these two quantities were based on selected valleys or at local sites using crude esti...
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Valley networks, concentrations of dendritic channels that often suggest widespread pluvial and fluvial activity, have been cited as indicators that the climate of Mars differed significantly in the past from the present hyperarid cold desert conditions. Some researchers suggest that the change in climate was abrupt, while others favor a much more gradual transition. Thus, the precise timing of...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2013
ISSN: 0094-8276
DOI: 10.1002/grl.50687