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1.
A Further Inquiry on the Mechanism of 30-60 Day Oscillation in the Tropical Atmosphere 总被引：8，自引：0，他引：8
Li Chongyin 《大气科学进展》1993,10(1):41-53
In a simple semi-geostropic model on the equatorial β-plane, the theoretical analysis on the 30-60 day oscillation in the tropical atmosphere is further discussed based on the wave-CISK mechanism. The convection heat-ing can excite the CISK-Kelvin wave and CISK-Rossby wave in the tropical atmosphere and they are all the low-frequency modes which drive the activities of 30-60 day oscillation in the tropics. The most favorable conditions to excite the CISK-Kelvin wave and CISK-Rossby wave are indicated: There is convection heating but not very strong in the atmosphere and there is weaker disturbance in the lower troposphere.The influences of vertical shearing of basic flow in the troposphere on the 30-60 day oscillation in the tropics are also discussed. 相似文献
2.
CISK-rossby wave and the 30-60 Day Oscillation in the Tropics 总被引：1，自引：0，他引：1
The 30-60 day oscillation is an important aspect of the atmospheric variance in the tropical area. A number of works have been done on this phenomenon, this article is a further one. A quasi-geostrophic linear model that consists of a two-layer free atmosphere and a well-mixed boundary layer is used to investigate the instability of intraseasonal oscillation, its propagation and vertical structures. Results show that the dynamical coupling and interaction between the barotropic and baroclinic components via boundary layer convergence / divergence are responsible for the appearance of a new kind of low-frequency wave. Such wave is very different from the traditional tropical Rossby wave. It can propagate westward and eastward. Some behaviours of it appear to resemble the observed 30-60 day oscillation mode in many aspects, such,as vertical structures, zonal and meridional propagations. Now many researchers emphasize the direct relationship between CISK-Kelvin mode and the tropical atmospheric 30-60 oscil 相似文献
3.
The 30–60 day oscillation is an important aspect of the atmospheric variance in the tropical area. A number of works have
been done on this phenomenon, this article is a further one. A quasi-geostrophic linear model that consists of a two-layer
free atmosphere and a well-mixed boundary layer is used to investigate the instability of intraseasonal oscillation, its propagation
and vertical structures. Results show that the dynamical coupling and interaction between the barotropic and baroclinic components
via boundary layer convergence / divergence are responsible for the appearance of a new kind of low-frequency wave. Such wave
is very different from the traditional tropical Rossby wave. It can propagate westward and eastward. Some behaviours of it
appear to resemble the observed 30–60 day oscillation mode in many aspects, such.as vertical structures, zonal and meridional
propagations. Now many researchers emphasize the direct relationship between CISK-Kelvin mode and the tropical atmospheric
30–60 oscillation. It is considered that CISK-Rossby mode should not be neglected. 相似文献
4.
FURTHER STUDIES ON EVAPORATION-WIND FEEDBACK 总被引：1，自引：0，他引：1
李崇银 《热带气象学报(英文版)》1997,3(1):11-17
The results from simple dynamic studies on the evaporation-wind feedback show that the effect cannot change the nature of tropical atmospheric waves (by retarding the speed), so that the evaporation-wind feedback alone cannot be an exciting mechanism of intraseasonal oscillation in the tropical atmosphere. This is different from that of the wave-CISK mechanism. With combined effect of the cumulus convection heating and evaporation-wind feedback, the CISK-Kelvin waves and CISK-Rossby waves will develop unstably, explaining the dynamic mechanism of tropical intraseasonal oscillation in a more complete and reasonable way than the convection heating alone. Therefore, the evaporation-wind feedback is also important to the intraseasonal oscillation in the tropical atmosphere. 相似文献
5.
热带积云对流加热在全球大气遥响应中的重要作用──数值试验结果 总被引：5，自引：1，他引：5
利用ＩＡＰ两层大气环流模式模拟研究了热带地区积云对流加热在大气对赤道东太平洋海温正异常响应中的作用。通过对积分结果进行分析发现：热带地区积云对流在大气对赤道东太平洋海温正异常的响应过程中起着非常重要的作用。若热带地区的积云对流加热减弱则大气中的遥响应（相关）型也减弱。同时我们还发现，热带地区的积云对流加热加强则响应场的３０—６０ｄ低频振荡也得到加强。 相似文献
6.
Based on the ECMWF data(1980-1983) and others, a further inquiry on the activities and the structure feature of 30-60 day oscillation in the tropical atmosphere has been completed. The following results are obtained:There is stronger perturbation kinetic energy of 30-60 day atmospheric oscillation(AO) in the equatorial eastern Pacific. This means the equatorial eastern Pacific is a stronger activity region of 30-60 day AO in the tropics. Analyses also show that the AO system with the time scale of 30-60 days might consist of various spatial scale disturbances. The zonal propagation of 30-60 day oscillation in the tropical atmosphere is not all eastward. Some differences are found for different spatial scales, and for propagations in upper and lower tropospheres. The meridional propagation of the oscillation is even more different in the various regions and might be related to the low-frequency wave train in the atmosphere. The stronger activities of 30-60 day AO in the equatorial middle-western Pacific are related to the El Nino events and the weaker ones are correspondent to the inverse El Nino phenomena. 相似文献
7.
An atmospheric general circulation model is used in a series of three experiments to simulate the intraseasonaloscillation in the tropical atmosphere.Analyses of the model daily data show that various physical variables,from sever-al different regions,exhibit fluctuations with a spectral peak between 30 and 60 days.This represents a 30—60 dayoscillation in the tropical atmosphere and possesses several features which are consistent with observations.These in-clude a horizontal structure dominated by zonal wavenumber 1 and a vertical structure which is predominantlybaroclinic.The effect of warm SST (sea surface temperature) anomalies on the 30—60 day oscillation in the tropical atmos-phere is also simulated by prescribing global SST as observed in 1983.This has the effect of weakening the oscillationwhile at the same time the vertical structure becomes less baroclinic.The importance of cumulus convection to the propagational characteristics of this oscillation is demonstrated by acomparison of results based on different parameterizations for convection.In one case,where the maximum convectionover the Pacific is simulated to be too far east,the simulated 30—60 day oscillation shows evidence of westward propa-gation.In the second case,where the convection maximum is located near the observed position in the western Pacific,there is more clearly evidence of eastward propagation.Both results suggest that the location of maximum convection in the Pacific can have an important influence on thestrength,structure and propagation of the 30—60 day oscillation. 相似文献
8.
To add to the growing mature research on the tropical 30-50 day oscillations from a new prospective,
the current work bases on dynamic analysis of baroclinic quasi-geostrophic models to discuss dynamic
mechanisms for the generation and propagation of CISK-Rossby waves, and to understand restraints and effects
of different wave structures and thermodynamic forcing on the 30-50 day oscillations in the tropical atmosphere.
Some important properties of the oscillation propagation have been explained and, in detail, with respect to its
meridional propagation and vertical “baroclinic” structure. The work has come up with some new opinions and
viewpoints. New opinions about the propagation and energy dispersion are to be proved by more observations
and study. 相似文献
9.
Zhang Qin Ni Yunqi Lin Wuyin Wang Zhaomin D. D. Houghton 《Acta Meteorologica Sinica》1991,5(4):411-425
In this paper, five-year simulated data from a low-resolution global spectral model with triangular trunca-lion at wavenumber 10 are analyzed in order to study dynamical features and propagation characteristics ofintraseasonal oxillations over the mid-latitudes and the tropical atmosphere. The simulations show that thereis the 30-50 day periodic oscillation in the low-resolution spectral model without non-seasonal external forcing,and spatial scale of the intraseasonal oscihations is of the globe .Further analysis finds that propagation charac-ters of intraseasonal oscillations over the mid-latitudes and the tropics are different. The 30-50 day oscillationover the tropics exhibits structure of the velocity potential wave with wavenumber 1 in the latitudinal and thecharacter of the traveling wave eastward at speed of 8 longitudes/day. However, the 30-50 day oscillationsin mid-latitude atmosphere exhibit phase and amplitude oscillation of the standing planetary waves and theyare related to transform of teleconnection patterns over the mid-latitudes. The energy is not only transferredbetween the tropics and the middle-high latitudes, but also between different regions over the tropics. Based on the analysis of 5-year band pass filtered data from a 5-layer global spectral model of Jow-ordetwith truncated wavenumber l0,investigation is done of the source of intraseasonal oscillations in the extratropicalmodel atmosphere and its mechanism. Results show that (1) the convective heat transferred eastward alongthe equator serves as the source of the intraseasonal oxillation both in the tropical and the extratropical atmos--phere; (2) the velocity-potential wave of a zonal structure of wavenumber 1 gives rise to oxillation in divergentand convergent wind fields of a dipole-form as seen from the equatorial Indian Ocean to the western Pacificduring its eastward propagation, thus indicating the oscillation in the dipole-form heat soure:e/sink pattertl; (3)the tropical heat-source oscillation is responsible for the variation in phase and intensity of the extratropicalstationary wave train, and the interaction between the oscillating low-frequency inertial gravity and stationaryRossby modes that are probably mechanisms for the oscillations ip the middle-high latitudes. 相似文献
10.
热带大气中的准双周（10—20天）振荡 总被引：10，自引：3，他引：10
基于欧洲中期天气预报中心（ECMWF）的资料（1981—1988），本文对全球热带大气中的10—20天（准双周）振荡进行了比较系统的研究，包括其动能的分布及演变。扰动的结构和传播特征等。资料分析充分表明，热带大气10—20天振荡是热带大气中另一重要低频系统，其动能比30—60天振荡还要大，而其结构和活动又同30—60天振荡很不一样。例如热带大气10—20天振荡主要表现为纬向波数2—4；垂直结构以正压特征更显著；主要表现为向西传播；其经向风分量与纬向风分量同等重要。因此，对热带大气10—20天振荡值得更多注 相似文献