Special characteristics of the temperature structure near the surface
Special characteristics of the temperature structure near the surface
复制标题
近地表温度结构的特殊性
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
T. Foken
中科院分区：
文献类型：
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作者：
H. Sodemann;T. Foken
对南极大陆架冰上测得的气温剖面进行的详细分析表明，在离地面2米以下的地方经常存在逆温层。这一现象的规律性使人们得以深入描述其昼夜演变和长期行为。从额外的高分辨率的温度分布测量，据观察，逆温层导致的表面层热通量的辐射表面温度的去耦。结果表明，批量参数化是不能够提供有效的预测湍流热通量在这种条件下。一个模型与三层温度分布示出给有用的估计的空气动力学温度，即使在存在的逆温层附近的表面。这表明一种可能的方法来解决目前的大规模参数化的局限性，在高纬度地区的热通量。
SummaryDetailed analyses of air temperature profiles measured over the Antarctic shelf ice revealed the frequent presence of an inversion layer in the lower 2 m above ground. The regular character of the phenomenon allowed for an in-depth description of its diurnal evolution and long-term behavior. From additional high-resolution temperature profile measurements it was observed that the inversion layer leads to a decoupling of the surface layer heat fluxes from the radiative surface temperature. It is demonstrated that bulk parameterizations are not able to provide valid predictions of turbulent heat fluxes under such conditions. A model with a three-layer temperature profile is shown to give useful estimates for the aerodynamic temperature, even in the presence of an inversion layer near the surface. This indicates a possible approach to address the limitations of current bulk parameterizations for heat fluxes in high latitudes.