上層低気圧の一例

• Main Author: 増井 次夫
• Format: Report
• Language: Japanese
• Published: 横浜国立大学 1958
• Subjects: Pacific; Taimyr; Siberia
• Online Access: http://hdl.handle.net/10131/2874; https://ynu.repo.nii.ac.jp/?action=repository_uri&item_id=1357; https://ynu.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1357&item_no=1&attribute_id=20&file_no=1

The high level cyclone which moved over the Central Japan on March 24-25, 1952 was a particular case with remarkable characteristics in the Far East for the period 1951 to 1957. This high level cyclone appeared near the Taimyr Peninsula on March 21 and moved rapidly southeastward across Siberia and Manchuria. On March 24 when this cyclone progressed into the Sea of Japan its shape was elongated in the direction of the movement and the whole area was divided into two parts. The coldest part on 500mb surface, namely the main center of the high level cyclone, was located on the rear side. This center crossed the Central Japan on March 24-25 and the southernmost position of its track reached as low as 34°N and then it turned to northeastward. The most remarkable features appearing on the vertical cross section of this cyclone, compared with the Palmen's cutoff cyclone model, are as follows: 1. The features on the vertical cross section are not symmetric and the axis of warm air column in upper layer tilts northeastward. 2. The cold dome is distinct inspite of its small scale. 3. In the central portion the tropopause is very low (descending to near 500mb surface) and in the stratosphere air temperature is very high compared with ordinary high level cyclones. 4. Many surface cyclones steered by this high level cyclone are formed successively and among them the fourth surface cyclone is formed suddenly off the South-East Coast of the Central Japan. When the high level cyclone moves into North Pacific Ocean, only this surface cyclone develops.