苏勇,沈学顺,张红亮,刘永柱. 2020. GRAPES_GFS中三维参考大气的研究:参考态构造和实际预报试验[J]. 气象学报, (0):-, doi:10.11676/qxxb2020.075
GRAPES_GFS中三维参考大气的研究:参考态构造和实际预报试验
A study on the three-dimensional reference atmosphere in GRAPES_GFS: construction of reference state and practical forecast test
投稿时间:2019-10-09  修订日期:2020-09-22
DOI:10.11676/qxxb2020.075
中文关键词:  GRAPES_GFS,参考大气,四维变分,动能谱,质量守恒
英文关键词:GRAPES_GFS, Reference Profile, Four-Dimensional Variation, Kinetic Energy Spectrum, Mass Conservation
基金项目:国家重点研发计划项目(2017YFC1501901,2017YFA0604500)
作者单位E-mail
苏勇 国家气象中心 suyong@cma.gov.cn 
沈学顺 国家气象中心 shenxs@cma.gov.cn 
张红亮 国家气象中心 zhanghl@cma.gov.cn 
刘永柱 国家气象中心 liuyzh@cma.gov.cn 
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中文摘要:
      中国气象局数值预报中心自主研发的GRAPES_GFS(Global Regional Assimilation and PrEdiction System, Global Forecast System)采用基于等温大气构造的一维参考大气,前期的研究工作已在GRAPES_GFS的动力框架中引入了三维参考大气,并通过一系列的理想试验检验了新方法的正确性以及计算精度。[目的]本部分的研究工作,主要针对实际资料的预报试验,[方法]对比分析了不同三维参考态给定方法的优劣,然后采用气候平均法,进行了夏季两个月的四维变分循环预报试验。[结果] [结论]检验结果显示,使用三维参考大气之后,模式的综合预报性能得到了提升,对流层高度场、温度场的预报偏差有所减小,长期积分过程中模式质量损失较为严重的问题也得到了明显的缓解。另外,通过动能谱的对比也可以看到使用三维参考大气之后,模式在高层的能量耗散明显较小,能谱变化与观测更加吻合。
英文摘要:
      The GRAPES_GFS (Global Regional Assimilation and Pr Ediction System, Global Forecast System), independently developed by the NWP Center of China Meteorological Administration, uses a one-dimensional reference profile based on isothermal atmospheric structure. Previous research work has introduced a three-dimensional reference profile into the dynamic core of GRAPES_GFS, a series of benchmark test have been carried out to verify the correctness and accuracy of the new method. This part mainly focuses on the prediction experiments of real data, compares and analyses the advantages and disadvantages of different three-dimensional reference state setting methods, and then uses the climatic average method to carry out four-dimensional variational cycle forecasting experiments in summer for two months. The test results show that after using the three-dimensional reference profile, the comprehensive prediction performance of the model has been improved, the prediction variation of tropospheric height and temperature has been reduced, and the serious loss of mass in the long-term integration process has also been significantly alleviated. In addition, by comparing the kinetic energy spectra, it can be seen that the energy dissipation of the model at the upper level is significantly smaller after using the three-dimensional reference atmosphere, and the change of the energy spectra is more consistent with the observation.
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