针对太阳辐射加热导致的误差限制了温度的准确度， 提出了一种新的太阳辐射加热误差修正方法\_\_数值分析法。通过计算流体动力学CFD软件对探空温度传感器进行了地面到32 km高空不同气压条件下的热数值模拟分析。在分析中考虑探空温度传感器的外部热环境情况， 施加对流-太阳辐射耦合热边界条件, 建立了探空温度传感器的热分析模型， 并引入了表面涂层反射率和电阻体尺寸两个影响参数。分析数值仿真结果表明， 海拔与太阳辐射加热误差之间并非简单的线性关系， 而是随着海拔的增加斜率不断增大的曲线关系。现在业务使用的温度传感器表面涂层反射率的提高和电阻体尺寸的减小在高气压条件下降低辐射加热有明显效果， 但在低气压条件下， 太阳辐射对温度准确性的影响仍十分明显。
Temperature measurement errors of thermistors induced by solar radiation pose an important bottleneck against the improvement of the precision of numerical weather forecast as well as the climate change research. To tackle this problem, a numerical analysis method was proposed. Thermal numerical in different pressures of the range from 0 to 32 km altitudes obtained by sounding temperature sensor was simulation analyzed by employing the computational fluid dynamics (CFD). In this model, the thermal environment of the thermistors has been taken into consideration. The boundary conditions of external convection and solar radiation are thermally coupled in the model, in which the reflectivity of the surface coating and the body dimension of the thermistors play critical roles. The simulated results show that the relationship between the altitude and the error caused by solar radiation heating is not a simple linear, but for a parabolic relation, with the slop increasing as the altitude increases. Correction values of the radiosonde temperature measurement result vary with respect to the altitude. According to the modeling results based on the state-of-the-art thermistors, the improvement of surface reflectivitiy and the shrinkage of the dimensions of the thermistors offer an effective way to minimize solar radiation error under high barometric pressure. Nevertheless, under low barometric pressure the solar radiation has considerable impacts on the accuracy of temperature measurement, where numerical method presented in this paper may find its applications.
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