Archivation of decadal global datasets of energy and water budget on land surface, and the analyses and validation

本项目旨在估算未来10年全球陆地表面能量和水收支的分布，揭示对全球水循环气候环境变化有重大影响的陆地表面关键过程。我们仔细比较了具有相同边界条件和大气强迫的若干陆地表面模式及其输出。在本项资助的最后一年（H16-H17），我们取得了以下研究成果：我们将15个模型的输出以每日1度的尺度存档了10年。在不同的条件或设置下执行多个模拟，因此每次模拟的数据集数量都会增加。分析结果表明，多模式组合相对合理，与实测土壤湿度数据更接近实际。互比较中心（Inter-comparison Center）是利用最新的互联网技术和数据挖掘方案开发的。ICC将大量的4维模拟数据可视化，帮助用户捕捉和理解隐藏的地表过程。ICC在国际上得到了广泛的认可，不仅是我们的研究团队，也得到了普通用户的认可。开发了数据分发中心（DCC）来交换模拟数据和强迫。截至2006年3月，“通过多模型分析得出的最可信的数据集”中的30多万份文件已被下载。最可信的陆地表面估计说明了全球水文气候特征的新分类和水循环的更详细信息。这些结果发表在2006年海洋、陆地和大气中心的技术报告中，并可能被列入《科学》关于淡水循环和气候变化的特刊。

This project aims to estimate global distribution of land surface energy and water budget for ten years to reveal the key processes in land surfaces, which have large impact on climatic and environmental change of the global water circulation. We carefully intercompare number of land surface models and their outputs with same boundary conditions and atmospheric forcings. In the last year of this grant (H16-H17), we have had following research fruits.1.We archived 15 model-outputs in a daily and 1-degree scale for 10 years. Several simulations were executed with different conditions or settings, so that the amount of the datasets increases in multiplied by each simulation. The intensive analyses revealed that multimodel ensembles are relatively quite reasonable and closer to the reality by validation with observed soil moisture data.2.Intercomparison Center (Inter-comparison center) was developed with up-to-date internet technology and data mining schemes. ICC visualizes the massive 4-dimensinal simulation data and helps users to capture and understand the hidden land surface processes. ICC has been internationally praised by not only our close research groups but also ordinary users. Data Distribution Center (DCC) was also developed to exchange the simulated data and the forcings. Over 300,000 files in "the most plausible datasets by multimodel analyses" have been downloaded until March, 2006.3.The most plausible land surface estimation illustrated a new categorization of global hydro-climatic characteristics and more detailed information for water circulation. These results were published in the technical report of COLA (Center for Ocean, Land, and Atmosphere) in 2006, and will probably be included in a special issue of Science on the freshwater circulation and climatic changes.