火星上的太阳辐射激活尘埃层
An Insolation Activated Dust Layer on Mars
摘要：
火星被照亮的尘埃表面就像一个气泵。它是由土壤内低压下的热蠕变驱动的。在表层土壤中，这种气体流动必须由压力梯度来维持。这相当于尘埃颗粒上的升力。因此，顶层处于张力下，这降低了跃移的阈值风速。我们进行了实验室实验，以量化该活化层的厚度。我们使用平均粒度为67 $μ$ m的玄武岩。我们发现活性层的深度为100至200 $\rm μm$。按火星的规模，激活将减少约10%的跳跃阈值风速。
英文摘要：
The illuminated dusty surface of Mars acts like a gas pump. It is driven by thermal creep at low pressure within the soil. In the top soil layer this gas flow has to be sustained by a pressure gradient. This is equivalent to a lifting force on the dust grains. The top layer is therefore under tension which reduces the threshold wind speed for saltation. We carried out laboratory experiments to quantify the thickness of this activated layer. We use basalt with an average particle size of 67 $μ$m. We find a depth of the active layer of 100 to 200 $\rm μm$. Scaled to Mars the activation will reduce threshold wind speeds for saltation by about 10%.
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