湖-气热传输模型及参数敏感性研究          下载免费PDF全文

颜金凤  李倩  夏南  孙菽芬 《湖泊科学》2007,19(6):735-743

在一维涡扩散模型的基础上,发展了考虑冬天结冰和夏天蒸发等水体相变问题及对流混合过程的湖-气热传输模型.模型采用焓代替温度作为预报变量,这也更加方便处理水的相变问题.模型的计算结果与以色列Kinneret湖的观测资料进行对比,验证了模型的合理性,说明了加入对流混合过程是符合湖-气热传输的实际物理机制的.对风速和湖面摩擦速度作了敏感性实验,证明他们对湖面温度和蒸发潜热有着重要的影响.  相似文献   

Development of a Model for Water and Heat Exchange Between the Atmosphere and a Water Body     

孙蔬芬  颜金凤  夏南  孙长海 《大气科学进展》2007,24(5):927-938

A model for studying the heat and mass exchange between the atmosphere and a water body is developed, in which the phase change process of water freezing in winter and melting in summer and the function of the convective mixing process are taken into consideration. The model uses enthalpy rather than temperature as the predictive variable. It helps to set up governing equations more concisely, to deal with the phase change process more easily, and make the numerical scheme simpler. The model is verified by observed data from Lake Kinneret for a non-frozen lake in summer time, and Lake Lower Two Medicine for a frozen lake in winter time. Reasonably good agreements between the model simulations and observed data indicate that the model can serve as a component for a water body in a land surface model. In order to more efficiently apply the scheme in a climate system model, a sensitivity study of various division schemes with less layers in the vertical direction in the water body is conducted. The results of the study show that the division with around 10 vertical layers could produce a prediction accuracy that is comparable to the fine division with around 40 layers.  相似文献