| GRAPES模式动力框架的长期积分特征 |
| |
| 引用本文： | 胡江林,沈学顺,张红亮,杨学胜,王盘兴.GRAPES模式动力框架的长期积分特征[J].应用气象学报,2007,18(3):276-284. |
| |
| 作者姓名： | 胡江林 沈学顺 张红亮 杨学胜 王盘兴 |
| |
| 作者单位： | 1.南京信息工程大学大气科学系, 南京 210044 |
| |
| 基金项目： | 国家科技攻关项目;国家自然科学基金 |
| |
| 摘 要： | 通过考虑动量表面拖曳并利用牛顿松弛方法将温度松弛到纬向对称的温度场, 对GRAPES模式的动力框架进行了长期时间积分试验。通过统计分析其积分结果表明:GRAPES模式的动力框架可以模拟出大气环流的基本特征; 随着分辨率的提高, GRAPES模式动力框架的模拟结果显示出收敛的特性; 虽然GRAPES模式动力框架采用的是能量不守衡的半隐式半拉格朗日时间积分方案, 但长期时间积分试验表明其能量基本保持稳定。这些结果显示使用GRAPES模式动力框架作大气环流和气候研究的大气动力框架是可行的, 同时也为进一步改进GRAPES模式动力框架提供了线索和依据。
|
| 关 键 词： | 基准测试 大气环流模式 动力框架 数值试验 |
| 收稿时间： | 2006-03-08 |
| 修稿时间： | 2006-03-082007-01-12 |
Characteristics of GRAPES Dynamical Core in Long Term Integration |
| |
| Hu Jianglin,Shen Xueshun,Zhang Hongliang,Yang Xuesheng,Wang Panxing.Characteristics of GRAPES Dynamical Core in Long Term Integration[J].Quarterly Journal of Applied Meteorology,2007,18(3):276-284. |
| |
| Authors: | Hu Jianglin Shen Xueshun Zhang Hongliang Yang Xuesheng Wang Panxing |
| |
| Affiliation: | 1.Department of Atmospheric Sciences, Nanjing University of Information & Technology, Nanjing 2100442.State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081 |
| |
| Abstract: | In order to evaluate the characteristics of the dynamical core of GRAPES (Global/Regional Assimilation and PrEdiction System) and to verify whether the GRAPES dynamical core can be taken as a framework of AGCM, the long time integration has been carried out with GRAPES dynamical core followed by the benchmark test similar to the technique introduced by Held and Suarez. The GRAPES has a finite-difference dynamical core with fully compressible, non-hydrostatic framework and semi-implicit and semi-lagrangian (SISL) time integration scheme using latitude and longitude horizontal coordinate as well as following terrain height vertical coordinate. The computational design uses two simple physical processes to represent physics processes in the model during the time integration. The first process is to relax the model variant, potential temperature, to a prescribed potential temperature field which is a function of latitude and height during the model time integration. Following Held and Suarez, the second one is the momentum drag in the lower troposphere to consume the kinetic energy in the model atmosphere. The GRAPES dynamical core runs with 31 levels in vertical direction and 3 horizontal resolutions:1.25°, 2.5°and 5.0°latitude or longitude. The benchmark tests integrate for 1460 days under each horizontal resolution and the last 1000 days data are analyzed by discarding the previous 460 day results. The statistic results show that the GRAPES dynamical core can reproduce basic features of atmospheric circulation, including reasonably realistic zonal mean temperature and its eddy variance as well as zonal-mean wind and its eddy variance. A single westerly jet is generated with maximum strength of roughly 28 m/s near 45°latitude in the tropopause. And eddy temperature variance shows two middle latitude maxima, one in the low troposphere and the other above tropopause. The GRAPES dynamical core also shows stability for the energy and momentum as well as vertical wind speed during the long term integration although SISL scheme does not observe the conservations. The GRAPES dynamical core has convergence features along with increasing resolution, although 5.0° resolution in latitude and longitude may be too coarse to represent the circulation details. Finally, the sensitivity to non-hydrostatic is discussed. The results indicate that it is feasible using the GRAPES frame as a dynamical core for AGCM and climate investigation. The numerical experiments provide clues and evidences for GRAPES dynamical core improvement also. |
| |
| Keywords: | benchmark tests AGCM dynamical core numerical experiments |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《应用气象学报》浏览原始摘要信息 |
|
点击此处可从《应用气象学报》下载全文 |
|
