Rossby波的螺旋斑图

应用描写大气大尺度运动的准地转方程组，求得了大气Rossby波的三维定常流场以及相应的位温场、涡度场和散度场，其中的三维流场构成了物理空间的一个非线性自治动力系统. 研究表明，Rossby波具有

THE SPIRAL PATTERNS OF THE ROSSBY WAVES

Starting from the quasi geostrophic motion equations describing the large scale motion in the atmosphere, the steady three dimension stream field and the corresponding potential temperature, vorticity and divergence fields are obtained. So the three dimensional locity field constructs a nonlinear autonomous dynamical system in the physical space. It is shown that the Rossby waves possess a tilting spiral structure, which represents that the stream field is horizontal convergence at lower layer and ascending motion in front of trough, but descending motion and horizontal divergence at lower layer behind the trough. It makes westerlies momentum from the north and the south concentrate on the center regions of Rossby waves, this is known ordinarily as the “negative viscosity” phenomena. It implies that the rotation of earth and basic current are playing an important role in the spiral structure of the Rossby waves.