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Search Results: 1 - 10 of 15493 matches for " JI Liren "
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Optimal sensitivity perturbation analyses on persistent anomalous summer circulation in East Asia
Yan Yang,Liren Ji
Chinese Science Bulletin , 1997, DOI: 10.1007/BF03182649
Abstract:
Persistent anomalous flows over the subtropical western Pacific in summer
Shiyu Zhuang,Liren Ji
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883574
Abstract: The distribution of global persistent anomaliesshows that the subtropical western Pacific is a key region with high-frequency occurrence of persistent anornalics. Analyscs of streamfunction anomalies, 013 anomalies etc. suggest that the convective heating related to Indian nlon.uwn might he responsible for the development of WPA. The results of numerical experiment by two linear bamtmpic rnodcls support the observation.
Anomalous activity of East Asian winter monsoon and the tropical Pacific SSTA
Cholaw Bueh,Liren Ji
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885058
Abstract: The relationship between the anomalous East Asian winter monsoon (EAWM) activity and the tropical Pacific SST anomalies has been identified using the results of 40-year integration of the IAP CGCM1 model and 10-year observational data. In the strong EAWM year, the western and central Pacific are dominated by positive SST anomalies while the eastern Pacific is negative ones. In the weak EAWM year, the SSTA pattern is quite different and shows El Ni o-like SST anomalies. The strong EAWM activity tends to create extra easterly ffow to the east and extra westerly flow to the west of the warm SSTA region over the equatorial western and central Pacific, thus leading to the enhancement of convergence and convection of the flow in this region and favorable to the maintenance and development of such an SSTA pattern. On the other hand, the warm SST anomaly over the western and central Pacific, as a forcing, may lead to a specific pattern of the northern extratropical atmosphere, which is favorable to the strong EAWM activity. The tropical Pacific SSTA pattern related closely to the strong EAWM activity differs significantly from that of the La Ni a year.
The Ocean-Atmosphere Coupled Regimes and East Asian Winter Monsoon (EAWM) Activity
Bueh Cholaw,Ji Liren,
Bueh Cholaw
,Ji Liren

大气科学进展 , 1999,
Abstract: In this paper, ocean-atmosphere coupled regimes are identified on the basis of SVD analysis, cluster analysis and composite analysis. The coupled regimes in cold seasons are identified as the clusters of the ocean-atmosphere coupled states in a low dimensional phase space spanned by the first four SVD modes. Three coupled regimes are found. The first two coupled regimes reflect the ENSO episodes and the accom-panying PNA patterns. The third regime, i.e., EAWM regime, is characterized by the strong EAWM activi-ty and the specific SST anomaly. The composite analysis gives further evidences to the identification of EAWM regime and also demonstrates the dynamical process of its formation. The anomaly pattern of the tropical Pacific SSTA in the strong EAWM year differs significantly from that of the La Nina year.
Internal Dynamics of the Generation of Atmospheric Teleconnection Patterns
Li Zhijin,Ji Liren,
Li Zhijin
,Ji Liren

大气科学进展 , 1996,
Abstract: A preferred growing perturbation concept has been introduced into the dynamical study on the generation of atmospheric teleconnection patterns. It is shown that all the important teleconnection patterns observed in the real atmosphere may be established through internal barotropic dynamical processes
The Role of Topography and Diabatic Heating in the Formation of Dipole Blocking in the Atmosphere
Luo Dehai,Ji Liren,
Luo Dehai
,Ji Liren

大气科学进展 , 1989,
Abstract: In this paper, the nonlinear stationary waves forced by topography and diabatic heating are investigated. It is pointed out that (1) the nonlinear interaction of different stationary waves forced only by topography might form dipole blocking in the atmosphere, this might explain the dipole blocking appeared in the Pacific and Atlantic regions; (2) the dipole blocking could not be caused by the nonlinear interaction of the different stationary waves forced by the diabatic heating alone; (3) the nonlinear interaction of the different stationary waves forced by both topography and diabatic heating could initiate dipole blocking in the atmosphere. In winter, the dipole blocking mainly occurs in the west regions of the Pacific and the Atlantic, and the heat source over the western part of the two oceans is advantageous to the formation of dipole blocking in the west of two oceans. However, in summer, the dipole blocking could be formed in the east part of the two oceans, and the heat source over the eastern part of two continents is favourable for the formation of dipole blocking in the east regions of two oceans.
ALGEBRAIC ROSSBY SOLITARY WAVE AND BLOCKING IN THE ATMOSPHERE
Luo Dehai,Ji Liren,
Luo Dehai
,Ji Liren

大气科学进展 , 1988,
Abstract: In this paper, the atmosphere is divided into two regions which are governed by different equations. Furthermore, multiple-scale method is used to obtain the Benjamin-Ono equation satisfied by the nonlinear Rossby wave in weak shear zonal flow. The equation has algebraic solitary wave solution, and the sta-tionary streamfunction fields in the atmosphere are calculated by using numerical method, and the results demonstrate that the stationary solution is antisymmetric dipoles with the anticyclone north of the cyclone, and the structure is similar to the equivalent modon obtained by Mcwilliains (1980), Because the modon obtained here is an algebraic solitary wave, the modon may be called “algebraic modon”, and the stationary algebraic modon is consistent with observations of blocking pattern in the atmosphere.
Efficient Anomalous Forcings for Linear Problems
Li Zhijin,Ji Liren,
Li Zhijin
,Ji Liren

大气科学进展 , 1994,
Abstract: For linear forcing problems, a method is developed to provide a set of forcing modes which form a complete orthonormal basis for the finite-time response to steady forcing in the energy inner product space. The forcing modes are found by calculating eigenvectors of a positive definite and symmetric matrix determined from given equations of motion. The amplitude of responses to forcing modes is given in terms of the associated eigenvalues. This method is used in a nondivergent barotropic model linearized about the 300 hPa zonally-varying climatological flow both for northern summertime and wintertime. The results show that the amplitude of response varies considerably with dif-ferent forcing modes. Only a few of forcing modes associated with the leading eigenvalues, called efficient forcing mode, can excite significant response. The efficient forcing modes possess highly localized spatial structure with wavetrain appearance. Most of the efficient forcings are located to the south of regions of the jet cores. The forcings located over polar regions are also efficient. In addition, the response is larger in wintertime than in summertime for a given forcing.
NUMERICAL EXPERIMENTS ON THE SEASONAL TRANSITION OF GENERAL CIRCULATION OVER ASIA--PART Ⅱ
Ji Liren,S.Tibaldi
大气科学进展 , 1984,
Abstract: In part Ⅱ of this paper, the effeets of diabatic heating and the Tibetan Plateau on the seasonal transition of the general circulation over Asia is investigated. It is shown that the effect of differential heating mainly due to land-sea contrast dominates even fora medium time scale. The effect of the Plateau seems to reinforce but not radically change the basic features of the events.
NUMERICAL EXPERIMENT ON THE SEASONAL TRANSITION OF GENERAL CIRCULATION OVER ASIA - PART Ⅰ
Ji Liren,S.Tibaldi
大气科学进展 , 1984,
Abstract: The onset of the 1979 summer monsoon is investigated using the ECMWF grid-point model. The role of the Tibetan Plateau in this process is investigated by means of parallel model integrations with different orographies. Similarly, the relative roles of land-sea thermal contrast, latent heat release and Southern Hemisphere influence are studied. The influence of the African Highland on the onset of the Somali jet is also explored. A generally satisfactory performance of the model in representing the onset of the monsoon is documented and various contributions to this from different model components are discussed. In Pan I of this paper the impact from the Southern Hemisphere is presented.
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