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  • 2005-2009  (2)
  • 2005  (2)
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  • 2005-2009  (2)
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  • 1
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    The Effect of Impacts on the Martian Climate (2005)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Evidence for the presence of liquid water early in Mars history continues to accumulate. The most recent evidence for liquid water being pervasive early in Mars history is the discoveries of sulfate and gypsum layers by the Mars Exploration Rovers and Mars Express. However, the presence of liquid water at the surface very early in Mars history presents a conundrum. The early sun was most likely approximately 75% fainter than it is today. About 65-70 degrees of greenhouse warming is needed to bring surface temperatures to the melting point of water. To date climate models have not been able to produce a continuously warm and wet early Mars. This may be a good thing as there is morphological and mineralogical evidence that the warm and wet period had to be relatively short and episodic. The rates of erosion appear to correlate with the rate at which Mars was impacted thus an alternate possibility is transient warm and wet conditions initiated by large impacts. It is widely accepted that even relatively small impacts (approximately 10 km) have altered the past climate of Earth to such an extent as to cause mass extinctions. Mars has been impacted with a similar distribution of objects. The impact record at Mars is preserved in the abundance of observable craters on it surface. Impact induced climate change must have occurred on Mars.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Workshop on The Role of Volatile and Atmospheres on Martian Impact Craters; LPI-Contrib-1273
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Outflow Channels Influencing Martian Climate: Global Circulation Model Simulations with Emplaced Water (2005)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The existence of surface water on Mars in past geologic epochs is inferred on the basis of geomorphologic interpretation of spaceflight images, and is supported by the recent Mars Odyssey identification of ice-rich soils [1]. The Mars Exploration Rovers have provided further chemical evidence for past surface hydrologic activity [2]. One issue is whether this water-rich climate ever existed in a steady state, or whether it was triggered by catastrophic events such as large impacts [3], and/ or catastrophic outburst floods, the topic of consideration here.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXVI, Part 18; LPI-Contrib-1234-Pt-18
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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