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Search Results: 1 - 10 of 41446 matches for " 薛纪善 Xue Jishan "
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斜压大气中飑线的非线性过程与K-dV方程
李麦村 Li Maicun, Xue Jishan
大气科学 , 1984, DOI: 10.3878/j.issn.1006-9895.1984.02.04
Abstract: 本文从理论上证明斜压非静力平衡大气中飑线的形成与演变和正压大气中一样可以归结为一类由K-dV方程所描述的大气孤波.讨论了在具有垂直切变的基本气流中这类孤波的结构特征,并与观测事实作了对比.当沿着低空急流出现有限宽度的初始扰动时,这种孤波可以被激发出来.当扰动的强度与宽度达到一定值时,还将形成一种孤波队列.这正是大气中所观测到的飑线或雷雨列队现象.
热带风场与气压场的客观分析
Xue Jishan,王康玲 Wang kangling
大气科学 , 1992, DOI: 10.3878/j.issn.1006-9895.1992.02.04
Abstract: 本文着重讨论了为恰当定义热带风场的辐散分量,客观分析方案所应具备的基本条件,指出过去通行的分析方案在这方面的严重缺陷,并提出了一个改进方案.理想与实测资料的分析结果都表明,新的分析方案在保留分析流场的辐散分量与减小分析误差方面都有明显的效果.同时新的分析方案还提供了低纬度实施多变量分析的可能性,从而部分地缓解了低纬度观测资料不完整所造成的困难.
Initialization of Limited Area Model Based on the Principle of Nonlinear Normal Mode Initialization
非线性正规模初值化原则在有限区模式的实现

Xue Jishan,Li Canji,Wang Zhiming,
,李璨玑,王志明

大气科学 , 1992,
Abstract: Two general conditions of initialization for limited area model and their corresponding iterative computational formulae are derived in this paper. These conditions are equivalent to those of nonlinear normal mode initialization, but totally expressed in terms of the model variables. The fact that the normal modes of the model do not appear in those formulae makes it easy to perform in any regional model, of which the normal modes are usually difficult to derive. This proposed initialization scheme is applied to the two numerical prediction models. The results have proven that this scheme can effectively suppress the unwanted high frequency gravitational oscillation due to imbalance existing in the initial data .
Economical Explicit Integration of High Resolution Regional Numerical Prediction Models
高分辨有限区数值预报模式的省时显式积分

Xue Jishan,Lin Junjie,Wang Kangling,
,林俊杰,王康玲

大气科学 , 1995,
Abstract: In this paper, an economical explicit scheme is used to integrate two high resolution numerial prediction models. It is shown that this new scheme for time integration effectively saves the computer resources without notable changes in the forecast fields. The problems of lateral boundary treatment needed When this scheme is applied to the limited area model are also discussed. A new boundary filter equivalent to that of leap frog scheme is proposed.
Objective Analysis of Wind and Pressure Fields in the Tropics
热带风场与气压场的客观分析

Xue Jishan,Wang kangling,
,王康玲

大气科学 , 1992,
Abstract: This paper discusses the basic requirements for the objective analysis scheme to define the divergent component of wind in the tropics. It is indicated that with analytical schemes commonly used, the divergent component can not be properly defined. To overcome the defiency, a new analytical scheme is proposed. Both ideal and real data experiments show that the new scheme can retain the divergent component and reduce the analysis error. The new scheme also provides a way to perform multi-variable analysis in low latitude regions. With this scheme, difficulties caused by lack of observational data in the tropics will be alleviated.
Non-linear evolution process of squall lines in baroclinic atmosphere and K-dV equation
斜压大气中飑线的非线性过程与K-dV方程

Li Maicun,Xue Jishan,
李麦村
,

大气科学 , 1984,
Abstract: 本文从理论上证明斜压非静力平衡大气中飑线的形成与演变和正压大气中一样可以归结为一类由K-dV方程所描述的大气孤波.讨论了在具有垂直切变的基本气流中这类孤波的结构特征,并与观测事实作了对比.当沿着低空急流出现有限宽度的初始扰动时,这种孤波可以被激发出来.当扰动的强度与宽度达到一定值时,还将形成一种孤波队列.这正是大气中所观测到的飑线或雷雨列队现象.
非线性正规模初值化原则在有限区模式的实现
Xue Jishan,李璨玑 Li Canji,王志明 Wang Zhiming
大气科学 , 1992, DOI: 10.3878/j.issn.1006-9895.1992.06.06
Abstract: 本文在普遍情况下导出了与非线性正规模初值化方法等价的、用模式变量表达的初值化准则与运算迭代公式.由于模式的正规模态在初值化计算中不明显地出现,故本文的结果对于正规模态难以求得的有限区模式的初值化有重要意义_试验实例表明,按本文的方案作初值处理,对于消除初值中的不平衡是十分有效的.
高分辨有限区数值预报模式的省时显式积分
Xue Jishan,林俊杰 Lin Junjie,王康玲 Wang Kangling
大气科学 , 1995, DOI: 10.3878/j.issn.1006-9895.1995.02.05
Abstract: 本文提出利用省时显式方案积分两个高分辨有限区数值预报模式。其结果表明,这一积分方案可以使模式的计算效率大大提高,而由时间积分方案的变化所造成的预报差异比模式空间离散化方案的不同所造成的预报差异要小。同时还讨论了将省时显式方案用于有限区模式的边界处理问题,提出了一个与蛙跃格式等价的边界处理方案。
GRAPES全球模式的模式误差估计
庄照荣 ZHUANG Zhaorong, XUE Jishan,李兴良 LI Xingliang,等 et al
大气科学 , 2010, DOI: 10.3878/j.issn.1006-9895.2010.03.11
Abstract: 现代数值天气模式考虑的物理过程和边界条件越来越复杂,但是它描述的大气状态和真实的大气流体运动轨迹还有一定的差距,存在模式误差。在以往的研究中,模式误差往往被忽略,在集合卡尔曼滤波同化系统中,如果忽略模式误差会导致滤波发散现象。本文用不同分辨率的模式预报差异估计了GRAPES全球模式的模式误差,研究发现模式误差随着分辨率降低而线性增加,而且模式误差随着预报时效的增加呈现线性增长的趋势。
Estimation of Model Error for the Global GRAPES Model
GRAPES全球模式的模式误差估计

ZHUANG Zhaorong,XUE Jishan,LI Xingliang,ZHANG Lihong,
庄照荣
,,李兴良,张利红

大气科学 , 2010,
Abstract: 现代数值天气模式考虑的物理过程和边界条件越来越复杂,但是它描述的大气状态和真实的大气流体运动轨迹还有一定的差距,存在模式误差。在以往的研究中,模式误差往往被忽略,在集合卡尔曼滤波同化系统中,如果忽略模式误差会导致滤波发散现象。本文用不同分辨率的模式预报差异估计了GRAPES全球模式的模式误差,研究发现模式误差随着分辨率降低而线性增加,而且模式误差随着预报时效的增加呈现线性增长的趋势。
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