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大气科学  2007 

舍入误差对大气环流模式模拟结果的影响

DOI: 10.3878/j.issn.1006-9895.2007.05.06

Keywords: 大气环流模式,舍入误差,计算精度,误差研究方法,集合预报

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Abstract:

此文旨在研究气候数值模式的长期计算时受舍入误差的影响。通过对大气环流谱模式SAMIL采用不同CPU数计算时获得的长时间积分结果进行分析,发现使用不同CPU数进行单精度计算时,其十年平均月平均500hPa高度场随机误差在正负6~8gpm范围内,而使用双精度计算时相应的误差为正负3~4gpm。对于气候平均场而言,作者的试验表明SAMIL在并行计算时由于计算顺序改变而引起的误差在可接受范围之内。然而,虽然舍入误差的全球平均值不大,但其误差分布的差别范围并不小。数值试验得到的不同模拟结果之间误差大小与模拟结果的自身年际变化大小在同样的量级,因此对于“年际变化”这样的问题来说,其影响是不可忽略的,必须要使用集合预报的办法来减小误差的影响。文中列出了3种研究复杂数值模式舍入误差的实验方法,指出其一定条件下的等效性和不同适用范围,对于其他模式的舍入误差影响研究有一定的参考价值。在舍入误差分析的基础上,介绍了一种新型的专门针对舍入误差的集合预报方法(舍入误差平均集合,RME),指出了其在气候模拟研究中的应用价值。

References

[1]  Walter J K.Note on the accumulated error in the numerical integration of a simple forecast model.Mon.Wea.Rev.,1969,97 (12):896~901.
[2]  Williamson D L.Washington W M.On the importance of precision for short-range forecasting and climate simulation.J.Appl.Meteor.,1973,12 (8):1254~1258
[3]  Rosinski J M,Williamson D L.The accumulation of rounding errors and port validation for global atmospheric models.SIAM Journal of Scientific Computing,1997,18 (2):552~564
[4]  Janakiraman S R,Ratnam J V,Akshara K.Study of machine round-off response on weather forecasting simulations using high performance computing systems.The Fourth International Conference on High-Performance Computing in the Asia-Pacific,Region-Volume 2,2000,1070~1072
[5]  王在志,吴国雄,刘平,等.全球海-陆-气耦合模式大气模式分量的发展及其气候模拟性能I:水平分辨率的影响.热带气象学报,2005,21:225~237 Wang Zaizhi,Wu Guoxiong,Liu Ping,et al.The development of GOALS/LASG AGCM and its global climatological features in climate simulation.I:Influence of horizontal resolution.Journal of Tropical Meteorology (in Chinese),2005,21:225~237
[6]  王在志,宇如聪,王鹏飞,等.全球海-陆-气耦合模式大气模式分量的发展及其气候模拟性能Ⅱ:垂直分辨率的提高及其影响.热带气象学报,2005,21:238~247 Wang Zaizhi,Yu Rucong,Wang Pengfei,et al.The development of GOALS/LASG AGCM and its global climatological features in climate simulation.Ⅱ:The increase of vertical resolution and its influences.Journal of Tropical Meteorology (in Chinese),2005,21:238~247
[7]  周天军,宇如聪,王在志,等.大气环流模式SAMIL及其耦合模式FGOALS-s.北京:气象出版社,2005.288pp Zhou Tianjun,Yu Rucong,Wang Zaizhi,et al.Atmosphere Circulation Model SAMIL and the Full Coupled Model FGOALS-s (in Chinese).Beijing:China Meteorological Press,2005.288pp
[8]  Wang Z Z,Wu G X,Wu T W,et al.Simulation of Asian monsoon seasonal variations with climate model R42L9/LASG.Advances in Atmospheric Sciences,2004,21:879~889
[9]  王鹏飞,王在志.大气环流数值模式的一种并行化方案.大气科学,2006,30 (3):519~525 Wang Pengfei,Wang Zaizhi.A parallelization scheme for atmospheric general circulation model.Chinese Journal of Atmospheric Sciences (in Chinese),2006,30 (3):519~525
[10]  Miyakoda K,Hembree G D,Strickler R F,et al.Cumulative results of extended forecast experiments I.Model performance for winter cases.Mon.Wea.Rev.,1972,100 (12):836~855
[11]  Shukla J.Predictability,Large-Scale Dynamical Processes in the Atmosphere.Academic Press,1985.87~122
[12]  Kalnay E,Dallavalle P J,Epstein E S.Hedging Perfect Prog Forecasts Towards Climatology.Camp Spring,1987.197~201
[13]  Dalcher A,Kalnay E.Error growth and predictability operational ECMWF forecasts.Tellus,1987,39A:474~491
[14]  Reynolds C A,Webster P J.Random error growth in NMC\'s global forecasts.Mon.Wea.Rev.,1994,122 (6):1281~1305
[15]  李建平,曾庆存,丑纪范.非线性常微分方程的计算不确定原理 Ⅰ.数值结果.中国科学 (E辑),2000,30 (5):403~412 Li Jianping,Zeng Qingcun,Chou Jifan.Computational uncertainty principle in nonlinear ordinary differential equations-I.Numerical results.Science in China (Series E),2000,43 (5):449~461
[16]  李建平,曾庆存,丑纪范.非线性常微分方程的计算不确定原理Ⅱ.理论分析.中国科学(E辑),2000,30 (6):550~567 Li Jianping,Zeng Qingcun,Chou Jifan.Computational uncertainty principle in nonlinear ordinary differential equations-Ⅱ Theoretical analysis.Science in China (Series E),2001,44 (1):55~74
[17]  Wang Pengfei,Huang Gang,Wang Zaizhi.Analysis and application of multiple precision computation and round-off error for nonlinear dynamical systems.Advances in Atmospheric Sciences,2006,23 (5):758~766

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