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1.
NUMERICAL EXPERIMENTS ON THE TROPICAL AIR-SEA INTERACTION WAVES   总被引:2,自引:0,他引:2       下载免费PDF全文
By means of the numerical method,the tropical air-sea interaction waves are studied.The results show that whenthe Kelvin waves are filtered out and only the equatorial Rossby waves are reserved both in the atmosphere and in theocean,the disturbances can also propagate eastward because of the air-sea interaction.The critical wavelength of theeastward propagating waves is related to the intensity of the air-sea interaction.The stronger the air-sea interaction,thelarger the eastward propagating components of the air-sea interaction waves.The results of the numerical experimentsare in good agreement with those of the theoretical analysis(Chao and Zhang,1988).  相似文献   

2.
热带海气相互作用波及其不稳定性   总被引:8,自引:1,他引:8  
本文利用一个简单的海气耦合模式,讨论了热带海洋和大气中Rossby波的相互作用。结果指出,海洋和大气中向西传播的Rossby波耦合后,不仅存在着向西传播的波动,而且还可以产生一类向东传的新波。这种向东传播的波动出现在波长较长的波段范围内,这个范围的大小受海气相互作用强度的制约。另外,波动可以出现不稳定性,向西和向东传的波均有不稳定现象发生,不稳定增长率也受海气相互作用强度的制约。最后,根据所得到的海气相互作用波,对ENSO现象作了一个可能的解释。  相似文献   

3.
THE AIR-SEA INTERACTION WAVES IN THE TROPICS AND THEIR INSTABILITIES   总被引:14,自引:0,他引:14       下载免费PDF全文
By using a simple air-sea coupled model,the interaction of Rossby waves between the air and sea inthe tropics is discussed.It is shown that the coupling of Rossby waves in the two media produces notonly the westward propagating waves,but also a type of new wave which moves eastward.The eastwardpropagating waves exist in the scope of comparatively long wavelengths and this scope is governed bythe intensity of the air-sea interaction.In addition,instability may appear in both the eastward and west-ward propagating waves,and the wave amplifying rates are also governed by the intensity of the air-seainteraction.In the end,a possible explanation to ENSO events is given in terms of the air-sea interactionwaves.  相似文献   

4.
Unstable tropical air-sea interaction waves and their physical mechanisms   总被引:1,自引:0,他引:1  
In this paper, the tropical air-sea interaction is discussed by using a simple air-sea coupled model, in which the inertia-gravity waves are filtered off and only the equatorial Rossby waves are reserved in both the atmosphere and the ocean. There exist two kinds of air-sea interaction waves in the coupled model, that is, the high-frequency fast waves and the low-frequency slow waves. The phase speed of the fast waves is westward and the frequencies are close to those of the equatorial Rossby waves in the atmosphere. The slow waves propagate westward in the part of short wavelengths and eastward in that of long wavelengths. There exist instabilities for both the westward and eastward propagating slow waves. If the fast waves are filtered off, there is little effect on the slow waves which have great in-fluence on the long range process in the tropical air-sea coupled system. According to the tropical air-sea interaction waves we obtain here, a possible explanation to the propagating process of ENSO events is given.  相似文献   

5.
Comparative analysis is carried out by using finite-domain power spectrum and lagged regression methods for the propagating characteristics and air-sea interaction processes of intraseasonal oscillations (ISOs) in the Asia to western Pacific (AWP) region during the boreal summer between the active and inactive tropical cyclone (TC) years from 1979 to 2004.The results show as follows.(1) There exist more significant eastward propagating characteristics of the ISO in the active TC years over the whole AWP region.The ISOs of convection propagate zonally with more eastward extension in the years with active tropical cyclone activities,during which the 20-60-day period is strengthened,western Pacific becomes an area with evident characteristics of the propagation that is closely related to TC activities.(2) The air-sea interaction processes are the same in both active and inactive TC years,and the energy exchanges between the air and the sea play a role in maintaining the northwestward propagation of ISOs.(3) The air-sea interaction is more intensive in the active TC years than in the inactive ones.It is particularly true for the latent heat release by condensation as the result of convection,which may be one of the reasons resulting in significant differences in characteristics of ISOs between the active and inactive TC years.  相似文献   

6.
应用有限区域波数-功率谱和滞后线性回归统计方法,对比分析1979—2004年热带气旋(TC)活动强、弱年亚洲-西太平洋区域(AWP)夏半年大气季节内振荡(ISO)的传播特征及海气相互作用过程。分析结果表明:在整个AWP和西太平洋区域都存在TC强年ISO东传特征更显著的特征,ISO对流传播在纬向上伸展更偏东,强年沿赤道东传20~60 d周期波动更强,西太平洋区域是传播特征强弱年区别较显著的区域,与TC活动密切联系;TC强、弱年ISO过程中海气相互作用过程相同,海洋和大气间的能量交换对维持ISO西北传播时起作用;TC强年的海气相互作用比弱年更加强烈,尤其是对流凝结潜热的释放在强年比弱年强,这可能是导致TC强、弱年ISO特征区别的原因之一。  相似文献   

7.
张人禾 《大气科学》1995,19(5):563-574
为了分析热带海气耦合系统中不稳定扰动究竟由哪种自由波占主导地位,根据本文第I部分提出的热带海气耦合模式,讨论了取耦合系统中不同的径向模时耦合波的性质,即分别讨论了大气长Rossby波和海洋长Rossby波、大气Kelvin波和海洋长Rossby波、大气长Rossby波和海洋Kelvin波的耦合波以及考虑了大气和海洋中所有这些波动时耦合波的性质。结果指出,这些耦合波对海气耦合模式中参数的取值很敏感,不同的参数可以产生性质不同的耦合波。本文的结果也说明了海气耦合系统的性质与热带大气的性质和结构有很大关系。  相似文献   

8.
为了分析 EI Nio事件发生和消亡中热带太平洋纬向风应力的动力作用,建立一个类似于Zebiak的简单热带海洋数值模式,在观测到的风应力异常的强迫下,模拟赤道太平洋地区 1971年1月至 1998年8月海表温度异常的变化。结果表明,模式对观测的Nio3区海表温度异常(SSTA)有很好的模拟能力。模拟和观测Ni区SSTA之间的相关系数可达 0.90。模式对 El Nio事件期间赤道太平洋海表温度异常随时间变化也有较好的模拟能力。为了分析El Nio期间SSTA的空间分布及其随时间变化的动力学机制,还对1986~1989年 ENSO循环期间赤道太平洋地区观测的 SSTA的传播特征及其形成机制进行了分析。模式较好地模拟出了观测到的赤道太平洋地区SSTA的传播特征,即从1986年底至1987年 4月, SSTA具有向东传播的特征,从 1987年 6月至 1988年 2月具有向西传播的特征。动力学分析的结果表明,赤道中西太平洋地区的缔向风应力异常对 El Nio事件的发生和消亡具有重要作用。赤道中西太平洋地区的西风异常可强迫出东传的Kelvin波,这个东传的 Kelvin波对正 SSTA的东传起主要作用,当这个东传的 Kelv  相似文献   

9.
海气相互作用与年代际气候振荡可能机制初探   总被引:2,自引:2,他引:2  
从简单海气相互作用方程组出发,引进新的海洋对大气加热函数,得到简单海气相互作用方程组的解析解。解析解表明,海气相互作用可以产生不稳定耦合波,这种波的不稳定程度随海气相互作用系数和深海对海洋混合层的影响而不同,并且e-折时间尺度随海气相互作用系数出现极小值,这个极小值点对应的周期是最不稳定海气耦合波的周期;海气相互作用产生的最不稳定海气耦合波的周期在中纬度地区是18a,在低纬度是3.5a,在高纬度是35a,它可能是海气系统年代际振荡的机制之一。  相似文献   

10.
为了分析ElNio事件发生和消亡中热带太平洋纬向风应力的动力作用,建立一个类似于Zebiak的简单热带海洋数值模式,在观测到的风应力异常的强迫下,模拟赤道太平洋地区1971年1月至1998年8月海表温度异常的变化。结果表明,模式对观测的Nio3区海表温度异常(SSTA)有很好的模拟能力。模拟和观测Nio3区SSTA之间的相关系数可达0.90。模式对ElNio事件期间赤道太平洋海表温度异常随时间变化也有较好的模拟能力。为了分析ElNio期间SSTA的空间分布及其随时间变化的动力学机制,还对19861989年ENSO循环期间赤道太平洋地区观测的SSTA的传播特征及其形成机制进行了分析。模式较好地模拟出了观测到的赤道太平洋地区SSTA的传播特征,即从1986年底至1987年4月,SSTA具有向东传播的特征,从1987年6月至1988年2月具有向西传播的特征。动力学分析的结果表明,赤道中西太平洋地区的纬向风应力异常对ElNio事件的发生和消亡具有重要作用。赤道中西太平洋地区的西风异常可强迫出东传的Kelvin波,这个东传的Kelvin波对正SSTA的东传起主要作用,当这个东传的Kelvin波到达东边界,由于东边界的反射作用,在东边界产生西传的Rossby波,这个西传的Rossby波对赤道中东太平洋地区正SSTA的西传起主要作用。东传Kelvin波和反射的Rossby波对ElNio期间赤道东太平洋正SSTA二次峰值的形成具有重要作用。  相似文献   

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