Evolution of Land Surface Models: Quantitative Perspective
Land surface model is an integral part of earth system model. It simulates the exchange of energy,water, momentum, and carbon between land surface and atmosphere. With the advance of technology and knowledge, land surface models become more and more complex; some papers have already provided excellent reviews on them. This work tried to investigate the evolution of land surface models from the perspective of quantity. Quantity was defined as the most basic unit of model. Some quantities are related to systems, e.g. air temperature of atmosphere. There are hierarchical of systems considered in this study,with atmosphere, and land surface as the top-level systems. Each system can contain subsystems, e.g.vegetation contains canopy and root, and canopy contains leaf. All quantities can be classified as variable,property of matter (e.g. latent heat of fusion of liquid water), flux of matter from one system to the other (e.g. rain from atmosphere to soil surface), constant (e.g. gravitational acceleration), and process (e.g. soil freeze and thaw process). Variables were further classified as prognostic, diagnostic, input, lookup,empirical constant and parameter. Six well-documented land surface models were considered in this study,including the earliest BUCKET model of 1 960 s, and the most recent Community Land Model, which was released in early 2 000 s. With the help of Java and Mysql database, the past evolution of land surface models was presented, based on the number of quantities used in the above-mentioned land surface models.Results show that quantities of vegetation component increased steadily, with quantities of other components show no such trend. Number of parameter quantities also increases over time. The recently published land surface models were also mentioned; and the future development of land surface models were discussed.
land surface model quantity evolution trend
Shuhua Yi
State Key Laboratory of Cryosphere Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, China Academic of Science, Lanzhou 730000, China
国际会议
2009 International Conference on Earth Science and Technology(2009地球科学与技术国际学术讨论会)
北京
英文
86-90
2009-05-14（万方平台首次上网日期，不代表论文的发表时间）