火星南极地区基底熔化可行性的热物理评估
Thermophysical assessment on the feasibility of basal melting in the south polar region of Mars
摘要：
明亮的基底反射物的雷达图从火星先进雷达地下和电离层探测（MARSIS）的火星南极层状沉积物（SPLD）已被解释为冰下湖泊的证据。然而，这种解释很难与火星低地热流和南极寒冷的地面温度相一致。我们进行了全面的热物理演化模拟的SPLD和冰下湖泊可能只形成在特殊情况下。如果SPLD包含超过60%的灰尘体积或极多孔的冰（> 30%），则可能形成冰下湖泊，这是不可能的。SPLD底部厚（>100米）的脏冰层（>90%的灰尘）也可能使基底融化，类似于污泥而不是湖泊。在SPLD中形成冰下湖泊的其他情况同样不太可能，例如最近在浅水处的岩浆侵入。
英文摘要：
Bright basal reflectors in radargram from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) of the Martian south polar layered deposits (SPLD) have been interpreted to be evidence of subglacial lakes. However, this interpretation is difficult to reconcile with the low Martian geothermal heat flow and the frigid surface temperature at the south pole. We conduct a comprehensive thermophysical evolution modeling of the SPLD and show that subglacial lakes may only form under exceptional circumstances. Subglacial lakes may form if the SPLD contains more than 60 % dust volumetrically or extremely porous ice (>30 %), which is unlikely. A thick (>100 m) layer of dirty ice (>90% dust) at the base of the SPLD may also enable basal melting, resembling a sludge instead of a lake. Other scenarios enabling subglacial lakes in the SPLD are equally unlikely, such as recent magmatic intrusions at shallow depths.
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