Long Term Evolution Of Early Martian Climate – Valley
Network Formation By Warm Or Cool Climate Conditions
A. Kamada1 (Ari_kmd@Pat.Gp.Tohoku.Ac.Jp), T. Kuroda1,2, T. Kodama3, Y. Kasaba4, And N. Terada1
1
Department Of Geophysics, Graduate School Of Science, Tohoku University, Sendai, Japan. 2division For The
Establishment Of Frontier Sciences, Organization For Advanced Studies, Tohoku University, Sendai, Japan.
3
Komaba Institute For Science, Graduate School Of Arts And Science, University Of Tokyo, Tokyo, Japan.
4
Planetary Plasma And Atmospheric Research Center, Tohoku University, Sendai, Japan.

Introduction:
Although Present-Day Mars Is Cold And Dry With A
Low Pressure Of Co2 Atmosphere And Little Amount
Of Surface And Subsurface H2o Ice, Decades Of
Geochemical And Geological Observations Have
Revealed That The Atmospheric Environment On Early
Mars Was Quite Different From That Of Mars Today.
Early Martian Terrains Were Carved By Numerous
Networks Of Valleys, Indicating Evidence That