模拟区域气候变化的模式系统的建立及其效能检验

A REGIONAL CLIMATE MODELLING SYSTEM AND PRELIMINARY NUMERICAL EXPERIMENTS

建立了一个富有特色的模拟区域气候变化的模式系统．该模式系统对模式中陡峭地形的处理方法进行了改进，并且在云量参数化方案中考虑了大气的动力学结构．其中大气模式与海洋模式和土壤模式简单耦合，和ＧＣＭ单向嵌套以反映大气环流背景对区域气候的影响．通过对模拟结果的比较和检验，发现区域模式对侧边界条件的依赖性很强，客观真实的侧边界条件是模式能够正确模拟区域气候要素的最重要的条件之一．模式分辨率的提高，中尺度强迫如地形高度和下垫面类型的细致刻划，都有利于气候要素场特别是边界层和地表气候状况模拟效果的改善．

In this paper authors developed a regional climate modelling system, in which the model resolution is increased, the calculation form of the pressure gradient force over steep terrain is introduced and the dynamics featrues of the atmosphere are considered in parameterization scheme of the cloud amount. In order to reflect the effects on regional climate of the global circulation, regional model is one way nested with GCM and includes simple air sea and land air coupled processes. From the contrast and examination of the simulated results, authors find that regional models have a strong dependence on the lateral boundary conditions. Both increasing the model resolution and meticulously describing the underlying surface types can improve the simulated results of the regional climatic characteristics.