Episodic warming of early Mars by punctuated volcanism

  title={Episodic warming of early Mars by punctuated volcanism},
  author={I Halevy and JamesW. Head},
The widespread evidence for liquid water on the surface of early Mars is di cult to reconcile with a dimmer early Sun. Many geomorphological features suggestive of aqueous activity, such as valley networks and open-basin lakes, date to approximately 3.7 billion years ago1–5, coincident with a period of high volcanic activity5,6. This suggests that volcanic emissions of greenhouse gases could have sustained a warmer and wetter climate on early Mars. However, models that consider only CO2 and H2O… CONTINUE READING