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Earth-like aqueous debris-flow activity on Mars at high orbital obliquity in the last million years

Artikel i vetenskaplig tidskrift
Författare Tjalling de Haas
Hauber Ernst
Susan J. Conway
Henk van Steijn
Andreas Johnsson
Maarten Kleinhans
Publicerad i Nature Communications
Volym 6
Sidor artikel nr 7543
ISSN 2041-1723
Publiceringsår 2015
Publicerad vid Institutionen för geovetenskaper
Sidor artikel nr 7543
Språk en
Länkar dx.doi.org/10.1038/ncomms8543
Ämnesord Mars, Istok, debris flows, water, impact crater, snow, obliquity
Ämneskategorier Planetsystemet, Klimatforskning, Exogen geovetenskap, Fysisk geografi

Sammanfattning

Liquid water is currently extremely rare on Mars, but was more abundant during periods of high obliquity in the last few millions of years. This is testified by the widespread occurrence of mid-latitude gullies: small catchment-fan systems. However, there are no direct estimates of the amount and frequency of liquid water generation during these periods. Here we determine debris-flow size, frequency and associated water volumes in Istok crater, and show that debris flows occurred at Earth-like frequencies during high-obliquity periods in the last million years on Mars. Results further imply that local accumulations of snow/ice within gullies were much more voluminous than currently predicted; melting must have yielded centimetres of liquid water in catchments; and recent aqueous activity in some mid-latitude craters was much more frequent than previously anticipated.

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