気圧パターンから見た北陸地方の冬季降水出現率

• Main Authors: 水口, 舞香, 加藤, 央之
• Format: Report
• Language: Japanese
• Published: 日本大学文理学部自然科学研究所 2021
• Subjects: wintertime precipitation; objectively classified SLP patterns; Hokuriku region; precipitation intensity; south-coast cyclone; aleutian low
• Online Access: https://repository.nihon-u.ac.jp/xmlui/handle/11263/2332; https://doi.org/10.15006/chs20201056009

In this study, we analyzed two sea level pressure (SLP) patterns with high precipitation rates from the objectively classified SLP patterns, thereby revealing the regional characteristics of wintertime precipitation in the Hokuriku region.1) For the pattern in which the Aleutian low developed with a slightly strong winter pressure pattern affecting Japan entirely, the precipitation intensity is determined by the wide SLP field (pattern), regardless of the narrow SLP pattern. Moreover, it is considered that the direct effects of cyclones passing through the Sea of Japan are more related to the pre-cipitation intensity in the Hokuriku region than the strength of the winter pressure pattern. Even under a same SLP pat-tern, precipitation characteristics in Niigata are often different from that of other stations. Furthermore, at the beginning of the stationary / continuous SLP pattern, strong precipitation is likely to occur in the Hokuriku region.2) For the pattern of the south-coast cyclone, the closer the cyclone (with a ridge extending from the northeast to the southwest in front of the cyclone) approaches the Japanese Island, the stronger the precipitation in the Hokuriku region, especially in Toyama, Fushiki, Wajima, Takada, and Niigata. In addition, the concurrent SLP transition pattern includes a pattern in which the same SLP pattern is not continuous, as well as a pattern in which a cyclone approaching Japan devel-ops and the pressure gradient increases.