Verification of GRAPES unified global and regional numerical weather prediction model dynamic core

During the past few years, most of the new developed numerical weather prediction models adopt the strategy of multi-scale technique. Therefore, China Meteorological Administration has devoted to developing a new generation of global and regional multi-scale model since 2003. In order to validate the performance of the GRAPES （Global and Regional Assimilation and PrEdiction System） model both for its scientific design and program coding, a suite of idealized tests has been proposed and conducted, which includes the density flow test, three-dimensional mountain wave and the cross-polar flow test. The density flow experiment indicates that the dynamic core has the ability to simulate the fine scale nonlinear flow structures and its transient features. While the three-dimensional mountain wave test shows that the model can reproduce the horizontal and vertical propagation of internal gravity waves quite well. Cross-polar flow test demonstrates the rationality of both for the semi-Lagrangian departure point calculation and the discretization of the model near the poles. The real case forecasts reveal that the model has the ability to predict the large-scale weather regimes in summer such as the subtropical high, and to capture the major synoptic patterns in the mid and high latitudes.     

利用HFC网进行宽带接入

本文讨论了各种接入方式 ,其中包括铜线接入新技术、光纤接入、HFC接入和无线接入等技术。其中 ,重点对HFC接入方案进行了介绍 ,它是我国当前最佳的接入方案     

Implications of stalagmite density for past climate change: An example from stalagmite growth during the last deglaciation from Wanxiang Cave,western Loess Plateau

Science Bulletin - The density of a stalagmite (WX42A) from Wanxiang Cave, Wudu County, Gansu Province, China, in the western margin of the Asian summer monsoon region, presents regular...     

温特斯模型参数并行求解方法与应用

针对能源生产中压缩空气日产量具有明显周期性和规律变化的特性,提出了一种基于霍尔特-温特斯模型的参数并行计算预测方法。从时间序列分析、指数平滑以及最优平滑系数的并行求解入手,建立了压缩空气日产量预测模型。实验结果表明该预测模型在提高运算速度的同时具有较高预测精度。     

New generation of multi-scale NWP system （GRAPES）： general scientific design

A new generation of numerical prediction system GRAPES （a short form of Global/Regional Assimilation and PrEdiction System） was set up in China Meteorological Administration （CMA）. This paper fo- cuses on the scientific design and preliminary results of the numerical prediction model in GRAPES, including basic idea and strategy of the general scientific design, multi-scale dynamic core, physical package configuration, architecture and parallelization of the codes. A series of numerical experiments using the real data with horizontal resolutions from 10 to 280 km and idealized experiments with very high resolution up to 100 m are conducted, giving encouraging results supporting the multi-scale application of GRAPES. The results of operational implementation of GRAPES model in some NWP centers are also presented with stress at evaluations of the capability to predict the main features of precipitation in China. Finally the issues to be dealt with for further development are discussed.