An approach to estimating and extrapolating model error based on inverse problem methods:towards accurate numerical weather prediction

Model error is one of the key factors restricting the accuracy of numerical weather prediction(NWP). Considering the continuous evolution of the atmosphere, the observed data(ignoring the measurement error) can be viewed as a series of solutions of an accurate model governing the actual atmosphere. Model error is represented as an unknown term in the accurate model, thus NWP can be considered as an inverse problem to uncover the unknown error term. The inverse problem models can absorb long periods of observed data to generate model error correction procedures. They thus resolve the deficiency and faultiness of the NWP schemes employing only the initial-time data. In this study we construct two inverse problem models to estimate and extrapolate the time-varying and spatial-varying model errors in both the historical and forecast periods by using recent observations and analogue phenomena of the atmosphere. Numerical experiment on Burgers’ equation has illustrated the substantial forecast improvement using inverse problem algorithms. The proposed inverse problem methods of suppressing NWP errors will be useful in future high accuracy applications of NWP.     

高校物理实验室仪器设备的规范化管理

本文详细阐述高校物理实验设备的管理,并提出了规范化管理的方式     

冲击电流计测量电容的实验中标准电容的取值对测量结果的影响

分析了利用冲击电流计测量电容的过程中产生误差的原因,着重讨论了标准电容的取值对测量结果的影响。结果表明:标准电容值与被测电容值的差值越小测量结果的误差也越小。     

快速调节交流电桥的平衡

本介绍交流电桥平衡条件和一种快速调节交流电桥平衡的方法，对初学大有益处。     

交流电桥的灵敏度和抗干扰问题的探讨

通过理论和实验,阐述了提高交流电桥灵敏度的方法和测量电路的选择。