Tropical cyclone scale vortices and associated Rossby waves were investigated numerically using high-resolution barotropic models on the global domain. The equations of the barotropic model were discretized using the spectral transform method with the spherical harmonics function as orthogonal basis. The initial condition of the vortex was specified as an axisymmetric flow in the gradient wind balance, and four types of basic zonal states were employed. Vortex tracks showed similar patterns as those on the beta-plane but exhibited more eastward displacement as they moved northward. The zonal-mean flow appeared to control not only the west-east translation but also the meridional translation of the vortex. Such a meridional influence was revealed to be associated with the beta gyre and the Rossby wave, which are formed around the vortex due to the beta effect. In the case of the basic zonal state of climatological mean, the meridional translation speed reached the maximum value when the vortex underwent recurving.

본 논문은, 이미 다른 학자들이 가이어 이론에 대한 연구와 저술을 많이 하였지만, 본 논문의 목적은 실제로 그의 주요한 시에서 가이어의 이미지가 어떻게 사 용되는지를 집중적으로 탐구한다. 연구대상의 시는 가이어 , 비잔티움으로의 항해 , 비잔티움 , 머무산 등이며, 다른 몇 편의 시는 주에서 간략하게 다루었다. 따라서, 본 논문의 목적은 다른 학자들의 이론을 검토하기 보다는, 위의 시들에서 가이어 이미지 가 실제로 어떻게 나타나는지를 탐구하여, 보다 깊이 있는 시 읽기에 도움을 주는데 있다.

As Yeats received the Nobel Prize in 1923, he was in the extremity of honor but he was feeling his weakening physical power. He gave up Maud Gonne and married George Hyde Ridge, a wise woman, to find a comfort at his home. His later poems are a record of his meditation and wisdom of life, and in those poems the image of Gyre is very important. He thought the progress of one civilization lasted for only 2,000 years and that is expressed through the image of the Gyre. The period of the early 20th century was a time of a kind of anarchy and a situation of desperation. He thought it was a turning point to a new terrible civilization. His poem "The Second Coming" is very meaningful in that view point and so is "Leda and Swan". Then his self consciousness of his old age and wisdom is well expressed in his "Tower" and Byzantium poems. But his self consciousness is not ended to a desperation but overcome to an immortal wisdom and art. In "Sailing to Byzantium" he sang the immortal art with a exquisite artisan spirit. And he particularly sang the world of soul and art in this poem. This is succeeded in "Byzantium". It is almost a song of spirit. As he grew old, Yeats concentrated his energy on the problem of spirit. As T. S. Eliot escaped to Hinduist meditation to overcome the limit of his early poems, Yeats made his particular view of history and civilization to enhance his poetry. If he had not opened his new poetic world in his later life, he could not have become that great poet we love so much.