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Search Results: 1 - 10 of 28222 matches for " Zhu Baozhen "
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A STUDY ON THE EXCITATION, ESTABLISHMENT AND TRANSITION OF MULTIPLE EQUILIBRIUM STATES PRODUCED BY NEARLY RESONANT THERMAL FORCING-PART II: THEORETICAL ANALYSIS OF THE MECHANISM OF MULTIPLE EQUILIBRIUM STATES
Qin Jianchun,Zhu Baozhen
大气科学进展 , 1986,
Abstract: Based on the results acquired in Part I of this paper, analysis is made of the theoretical mechanism of thermal forcing multiple equilibrium states (MES) and their stability. The results are as follows: 1) non-linear effect and external forcing are determinative factors for MES formation; 2) under proper “environ-mental conditions” the forcing can excite stable MES, particularly three types of solutions, two of which, with larger amplitude of resonance, are not sensitive to the change in the forcing intensity; while the other, i. e. the one of small amplitude, dependent significantly on it; 3) in general, the domain of parameter values for the MES existence increases, but the stability decreases, with increasing thermal forcing; 4) steady thermal forced waves are always unstable for the most part; 5) thermal driving and orographic effect act equally as dynamical triggers; 6) friction has significant influence upon the behavior of MES solutions.Analysis shows that the changes in the “environmental parameters”, such as the alteration of the shear of a basic current and intensity of the forcing, induce the transition between different equilibria.
A STUDY ON THE EXCITATION, ESTABLISHMENT AND TRANSITION OF MULTIPLE EQUILIBRIUM STATES PRODUCED BY NEARLY RESONANT THERMAL FORCING---- PART I: ASYMPTOTIC SOLUTIONS OF MULTIPLE EQUILIBRIUM STATES
Qin Jianchun,Zhu Baozhen
大气科学进展 , 1986,
Abstract: A two-layer quasi-geostrophic baroclinic model in a narrow, longitudinally periodic channel on a β-plane is used, which involves near-resonant thermal forcing, frictional dissipation and a uniformly sheared basic current. By means of the multi-scale technique, a system of simplified differential equations or disturbances due to the steady thermal-forcing waves projected on the X-T plane is derived, which contains the nonlinear interactions between forced waves and free waves. The asymptotic solutions of the equilibrium states of these equations are analytically obtained by a singular perturbation method. The results show that these mul-tiple equilibrium state (MES) solutions can exist in a wide range of the parameters used.
The Dynamical Influence of Land-Sea Contrast and Sea Surface Temperature on Intraseasonal Oscillation in Tropical Atmosphere
The Dynamical Influence of Land-Sea Contrast and Sea Surface Temperature on Intraseasonal Oscillation in Tropical Atmosphere

Yang Yan,Zhu Baozhen,
Yang Yan
,Zhu Baozhen

大气科学进展 , 1995,
Abstract: An equatorialΒ-plane model which includes realistic non-uniform land-sea contrast and the underlying surface temperature distribution is used to simulate the 30–60 day oscillation (LFO) processes in tropical atmosphere, with emphasis on its longitude-dependent evolution and convective seesaw between Indian and the western Pacific oceans. The model simulated the twice-amplification of the disturbances over Indian and the western Pacific oceans while they are travelling eastward. It reproduced the dipole structure caused by the out-of-phase oscillation of the active centres in these two areas and the periodical transition between the phases of LFO. It is suggested that the convective seesaw is the result of interaction of the internal dynamics of tropical atmosphere with the zonally non-uniform thermal forcing from underlying surface. The convective activities are suppressed over Indonesia maritime continents whilst they are favoured over the Indian Ocean and western Pacific warm waters, so there formed two active oscillation centres. The feedback of convection with large-scale flow slows down the propagation of disturbances when they are intensifying over these two areas, therefore they manifest a kind of quasi-stationary component to favor the ‘dipole’ structure. Whereas the disturbances weaken and speed up over the eastern Pacific cold water region due to the interaction of sensible heating and evaporation with perturbational wind. Therefore the two major centers just show out-of-phase oscillation during one cycle around the latitudinal belt. By introducing the SST anomalies in El Ni?o and La Ni?a years into the surface temperature, we also show that they have significant influence on LFO processes. In an anomalously warm year, the LFO disturbances dissipate more slowly over the central-eastern Pacific region and can travel further eastward; whilst in an anomalously cold year, the opposite is true.
The Modified Envelope Orography and the Air Flow over and around Mountains
Li Long,Zhu Baozhen,
Li Long
,Zhu Baozhen

大气科学进展 , 1990,
Abstract: By use of the two-layer adiabatic globe spectral model and the zonally averaged climatic data of winter season as initial values, 10-day integrations are carried out based on three kinds of model topography (i.e., (1) the averaged to-pography; (2) the envelope topography; (3) the modified envelope topography). The results show that the orography of the Northern Hemisphere plays an important role in the simulation of large-scale weather patterns in winter sea-son. The simulation based on the envelope topography developed by Wallace et al. has some improvements in the Rocky Mountains area. But this scheme causes very serious horizontal expansion around the Tibetan Plateau (hereafter referred to as the TP). A modified envelope topography scheme has been worked out that increases the slope of the TP by decreasing; the horizontal expansion while keeping the maximum altitude. The results show some improve-ments of the scheme around the TP. By analysis of the mechanical effects of the large-scale orography on the currents, the different forcings of the air flow over and around the TP sad the Rocky Mountain (the RM) are investi-gated.
Sensitivity of the Multiple Equilibria to Gorverning System, Mode Chosen and Parameter

Zhao Jingxia,Zhu Baozhen,

大气科学进展 , 1989,
Abstract:
MULTIPLE FLOW EQUILIBRIA IN THE TROPICAL CIRCULA-TION AND MONSOON

Zhu Baozhen,Zhao Jingxia,

大气科学进展 , 1987,
Abstract: The aim of this paper is to examine whether an axisymmetric tropical model with thermal driving and orographic forcing can produce multiple equilibria in relation to the monsoon circulation over South Asia. The model is an equivalent barotropic balanced equatorialβ-plane model. It shows that there may exist multiple flow equilibria for a given driving, of which two may be stable: one corresponds to the summer monsoon, and the other to the winter monsoon circulation. The transition between them is also discussed.
关于东亚大气环流一些特征的动力学过程
朱抱真 Zhu Baozhen
大气科学 , 1988, DOI: 10.3878/j.issn.1006-9895.1988.t1.04
Abstract:
THE DYNAMIC EFFECT OF THE TIBETAN PLATEAU ON THE FORMATION OF ZONAL TYPE CIRCULATION OVER EAST ASIA
Luo Meixi,Zhu Baozhen,Zhang Xuehong,
Luo Meixi
,Zhu Baozhen,Zhang Xuehong

大气科学进展 , 1985,
Abstract: From a statistical study of the atmospheric circulation types over the Northern Hemisphere it is found that the zonal type circulation predominates in East Asia. From a three-layer primitive equation model in σ-coordinate, the orographic effect on a westerly current over the Northern Hemisphere is studied. A distinguished deepening trough is observed in the lee-side slope of the Rocky Mountains. But a pronounced trough is over the East Asia coast far from the Tibetan Plateau. In a case of 48 h numerical forecast, it is found that the effect of the Tibetan Plateau tends to build up a rather zonal type circulation, which is con-sistent with the observations. These may be partly explained by the topographic effect of the north slope of the Tibetan Plateau in a simple geostrophic theory.
Dynamics of the oscillation in the nonlinear interaction atmosphere and ocean system and annual variation of the atmospheric circulation
海气耦合非线性振荡与大气环流年变

Jin Feifei,Zhu Baozhen,
金飞飞
,朱抱真

大气科学 , 1988,
Abstract: 本文利用作者建立的一个海气耦合的非线性动力系统,分别用定性和数值方法,分析定常强迫的自治系统和有周期性强迫的非自治系统中极限环解的性质,以此说明海气耦合振荡及大气环流年变的某些特征。
The Zonal Asymmetry of the Tropical Mean Circulation and the Dynamic Effect of Kelvin Wave
热带大气平均环流的纬向不均匀性和Kelvin波的动力作用

Yang Yan,Zhu Baozhen,
杨燕
,朱抱真

大气科学 , 1997,
Abstract: 本文利用一个包含Wave-CISK机制以及蒸发、感热与扰动风场的反馈机制,并引入实际的下垫面温度分布和海陆差异的热带大气模式,较好地模拟了低纬平均环流在风场、散度场及低层位势高度场上的纬向非均匀性。分析表明这种纬向非对称性是由于下垫面的热力非均匀性造成的强迫与大气内部的热力-动力反馈过程相互作用的结果。对热力强迫的响应形成了西太平洋暖水区上的西风和东太平洋上的东风,而对简化模式的解析分析说明,由于热力-动力反馈造成的Kelvin波的发展过程,可以解释平均东风强于西风的事实。
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