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Seasonal cycle of Martian relative humidity shows that, in the southern andthe northern RSL sites, humidity decreases when RSL increment while humidity ishigh on the fading season. We suggest that the recurrence of RSL is caused bythe different angle of response between wet and dry grains. 2D DEM simulationindicates that, when the ratio of a liquid bridge volume to a particle volumeis the order of 10^{-7}, the repose angle of Martian sand can increase to ~40degrees due to cohesion, which is near the slope around RSL starting area.Thus, if this amount of liquid bridge is generated by deliquescence orcapillary condensation of vapor and if the water evaporates following thehumidity and temperature cycles, Martian sand can induce avalanche on RSLslope. When grains are wet again, sand and dust deposit on RSL, which may bethe mechanism of RSL disappearance and recharge of grains for the next season.In our model, because liquid induces RSL indirectly (RSL itself is the granularflow), the amount of liquid can be drastically reduced compared with the wetmechanism. In this case, as well as temperature, the seasonal cycle of relativehumidity plays an important role in the recurrence of RSL.

Angle of repose of Martian wet sand using discrete element method:  Implication for the seasonal cycle of recurring slope lineae(RSL) by relative  humidity