柳崇健,赵琳娜,刘英. 2001. 物理耗散技术及其在MM4中的应用[J]. 气象学报, 59(5):524-532, doi:10.11676/qxxb2001.057
物理耗散技术及其在MM4中的应用
PHYSICAL DISSIPATIVE TECHNIQUE AND ITS APPLICATION TO THE MM4
投稿时间:1999-02-12  修订日期:2001-02-12
DOI:10.11676/qxxb2001.057
中文关键词:  流体力学  数值天气预报  物理耗散技术
英文关键词:Fluid dynamics  Numerical weather prediction  Physical dissipative technique
基金项目:国家自然科学基金委员会(49675268,40075024);国家重点基础研究发展规划项目(G1998040911)
作者单位
柳崇健 中国气象科学研究院 北京 100081 
赵琳娜 中国科学院大气物理研究所 北京 100029 
刘英 中国气象科学研究院 北京 100081 
摘要点击次数: 2017
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中文摘要:
      在传统的流体动力学框架下,数值天气预报问题往往被提为经典牛顿力学的确定论初值问题.然而大气是多体系统,利用仅对三体以下的系统才能精确描述的理论来处理多体系统的运动,会引起较大的误差和问题。为此,文中提出了一套在数值天气预报模式中引入“不可逆热力学算子”的技术,按热力学第二定律的约束方式,来控制多体系统的演变方向,以提高数值天气预报的精度。例如在MM4模式中引入不可逆热力学算子后,温度场、湿度场、高度场及全风速场的平均相对均方根误差减小了约13%,其中48h预报的误差减小两成以上。鉴于文中提出的不可逆热力学算子引入技术是基于描述耗散性的物理定律,而非纯粹出于计算上的考虑,故名为物理耗散技术。由于它所依据的物理原理对所有流体力学和大气数值模式均适用,因此该项新技术在地球物理流体力学界将有广阔的应用前景。
英文摘要:
      Under the traditional framework of fluid dynamics, the problem of the numerical weather prediction is often expressed as the deterministic initial value problem of the classical Newtonian mechanics. The atmosphere is, however, a many-body system, the methodology by which the system with two bodies could be precisely solved would cause bigger errors and problems when handling the many-body system by it. A kind of technique to incorporate "the irreversible thermodynamic operators",therefore, into the numerical weather prediction models is suggested in this paper, to control the evolutionary direction of the many-body system according to the constraining way of the second law of thermodynamics, and thus the forecasting accuracy of the numerical weather prediction has been noticeably improved:in (e.g.)the MM4 the averaged relative root mean square error of the fields of the temperature,humidity,height and whole wind velocity has decreased by about 13%, among which the averaged error of the 48-h forecasts has decreased by more than 20%. Since the technique to introduce the irreversible thermodynamic operator suggested in this paper is based on the physical lew that describes the dissipativity and comes out not only from the computational consideration, the technique is named as the physical dissipative technique. In view of the universality of the principle incorporating the irreversible thermodynamics operators suggested in this paper for the fluid dynamics and atmospheric numerical models, the applications and generalization of this incorporating technique would produce a great impact on the field of geophysical fluid dynamics.
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