Mars boundary layer modeling: Diurnal moisture cycle and soil properties at the Viking Lander 1 Site.
Mars boundary layer modeling: Diurnal moisture cycle and soil properties at the Viking Lander 1 Site.
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DOI：
10.1006/icar.1995.1146
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发表时间：
1995-09
期刊：
影响因子：
3.2
通讯作者：
H. Savijärvi
中科院分区：
文献类型：
--
作者：
H. Savijärvi
利用土壤温度扩散方案、简单的土壤水文和相互作用的冰云物理对火星多尘湿润大气边界层模型进行了增强。它应用于维京着陆器1号站点（48°W, 22.5°N）的夏季条件。当土壤性质调整为干燥的至少7 cm厚的沙状表土层，水分利用率为0.05%，导热系数为0.18 W m -1 K -1，体积热容为0.8 × 10 6 J m -3 K -1时，可以很好地模拟观测到的1.6 m日VL-1温度循环。夜间较低的温度导致模式中水汽饱和和地面雾的形成。夜间辐射雾扩展至60 ~ 80 m海拔高度，但仍然很薄，1.6 m海拔高度最大冰含量为0.05 g m -3, 07 lt时冰-水垂直路径为0.43可降水量(pr) μm。柱状水汽量保持在约16 pr μm（接近Viking MAWD观测值），在最低3 km处混合良好，混合比约为0.18 g/kg，除了地表附近，地面升华/结霜和凝结/升华进入/从雾中产生的水汽形成了一个清晰的日循环。1.6 m的相对湿度在夜间（22-07 LT）达到100%，但在下午降至1%以下。
Abstract A dusty and moist martian atmospheric boundary layer model was augmented with a soil temperature diffusion scheme, simple soil hydrology, and interactive icecloud physics. It was applied to the summertime conditions at the Viking Lander 1 site (48°W, 22.5°N). A good simulation of the observed 1.6-m diurnal VL-1 temperature cycle was obtained when the soil properties were adjusted to that of a dryish at least 7-cm-thick sandlike topsoil layer with water availability of 0.05%, thermal conductivity of 0.18 W m -1 K -1 , and volumetric heat capacity of 0.8 × 10 6 J m -3 K -1 . The cold nighttime temperatures lead to saturation of water vapor and surface fog formation in the model. The radiation fog extended to 60-80-m altitudes during the night, but remained thin, with maximum ice content of 0.05 g m -3 at 1.6 m height and vertical ice-waterpath of 0.43 precipitable (pr) μm by 07 LT. The fog dispersed within two hours after sunrise. The column water vapor amount stayed at about 16 pr μm (close to the Viking MAWD observations), being well mixed in the lowest 3 km with mixing ratios of about 0.18 g/kg, except near the surface where the ground sublimation/frosting and the condensation/sublimation into/from fog created a clear diurnal cycle. The 1.6-m relative humidities hit 100% at night (22-07 LT) but dropped below 1% in the afternoon.