北海道寿都地方の強風域における風向・風速の特徴

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タイトル別名
  • Features of Wind Speed and Direction over a Strong Wind Area in Suttsu District, Hokkaido, Japan
  • ホッカイドウ スッツ チホウ ノ キョウフウイキ ニ オケル フウコウ フウソク ノ トクチョウ

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抄録

A local strong south-southwesterly wind called Suttsu-dashi often prevails from May to July around the Suttsu region in the western part of Hokkaido, Japan. To elucidate the characteristics of this local wind, field observation was carried out in the region from Kuromatsunai to Suttsu Bay during May 9 to September 22, 1998. The observed data were analyzed together with other meteorologic data from synoptic weather maps, AMeDAS data, and aerological data from Sapporo Observatory. In addition, synoptic climatologic aspects of the Suttsu-dashi were statistically analyzed for past decadal years based on meteorologic data from the Suttsu Observatory and synoptic weather maps. Synoptic weather maps were classified into three types and the relationship between the Suttsu-dashi and synoptic pressure patterns was also investigated.<br> The main results and discussion can be summarized as follows:<br> 1) In many cases off the Suttsu-dashi, the surface weather map is characterized by a pressure pattern with an anticyclone over the Sea of Okhotsk (Okhotsk high type), and the southerly-to-southwesterly strong wind lasts relatively longer compared with the case of other pressure pattern types. However, no obvious relationship can be seen between the duration and the wind speed of the Suttsu-dashi.<br> 2) The results of the field observation demonstrate that the strong wind mainly prevails over the region to the north of Minamisakkai and forms a discontinuity line of wind speed between Shirozumi and Minamisakkai. The position of this discontinuity line corresponds to the valley from Kuromatsunai to Suttsu Bay.<br> 3) The wind speed difference between the Suttsu side and Utasutsu side of Suttsu Bay is not obvious. However, a difference in wind direction between the two sides is found, that is, it is south-southwesterly on the Utasutsu side and south-southeasterly on the Suttsu side. This suggests that one of the causes of the Suttsu-dashi can be attributed to horizontal wind divergence.<br> 4) A proportionality relation is found between the wind speeds at Kitasakkai and Tarukishi in many cases. However, this relation changes if the wind speed at Kitasakkai exceeds the critical wind speed of about 7 ms-1. When the wind speed at Kitasakkai is greater than the critical wind speed, the rate of increase in the wind speed at Tarukishi sometimes becomes higher than in cases with the wind speed less than critical. Surface weather maps in this case are categorized into the Okhotsk high-type only. In contrast, such features of wind speed cannot be found at Utasutsu.

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  • 地理学評論

    地理学評論 77 (6), 441-459, 2004

    公益社団法人 日本地理学会

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