Sea of Japan polar air mass convergence zone
A Sea of Japan polar air mass convergence zone (にほんかいかんたいきだんしゅうそくたい, Japan sea Polar air mass Convergence Zone, JPCZ) is a convergence zone of around 1,000km in length to be formed in the Sea of Japan in the winter season.
Table of contents
Summary
Because the cold wind of the cold air mass goes through it, in the winter Sea of Japan, it is possible for short snow cloud over warm seawater under the influence of warm currents. The height of the cloud is usually around 3,000m from 2,000m. In addition, the snow cloud stands in dozens of into a line form parallel to understand even the cloud image of the weather satellite. However, this circle is not parallel and may sometimes collide at a constant line. This is Sea of Japan polar air mass convergence obi.
For a cause, the influence of a white head mountain and the neighboring mountain ranges rising in the northern part of Korean Peninsula is pointed out [1]. By a high mountain more than up to 2,700m, the current of air of the chill is divided into two forcibly and converges when I join again. Because the height of the cloud and the height of the mountain are about the same, I do not lose my eyesight in a cloud of the sky, and even a cloud image comes out clearly. Actually, JPCZ is often located to grow southeast from the neighborhood of white head mountain.
On the line of JPCZ, a vortex (disturbance) often occurs. A small low pressure is generated with this, and a thunder cloud develops at the center, and it may be thunder and intense weather such as the hail. In addition, JPCZ has an influence on the snow on the Sea of Japan side mainly, but may grow on the Pacific side across the Japanese Islands.
The area that is easy to be affected
福井県嶺南地方, West Gifu mountains, North Shiga, North Hyogo, Tottori, East Shimane. The landing place moves the area facing the Sea of Japan among the above by a pressure pattern to the east and west, but it is 福井県嶺南 to be the most frequent (around Wakasa-wan Bay).
The example that brought a heavy snow
I add the Sea of Japan polar air mass convergence obi to West Hokuriku, San-in in the past and bring a heavy snow many times in the urban area of the Tokai district and the Kinki district and cause the main heavy snow in these areas.
- December, 1995 25-26 days: Yokkaichi 53cm (observation history maximum), Kyoto 14cm.
- December, 2005 18-19 days: Gifu 32cm, Nagoya 23cm (it is 58 years since then), Hiroshima 17cm. In addition, the cloud which flowed out in the Seto Inland Sea develops again then in Shikoku Mountains, and it snows in the record size of 9cm in Kochi-shi on the Pacific side.
- December, 2005 22-23 days: Nagoya 13cm, Hiroshima 12cm.
- December 31, 2010: Yonago 89cm (observation history maximum), Matsue 56cm, Tottori 53cm, Kyoto 9cm.
- February 2, 2012: Maizuru 87cm (observation history maximum), Hikone 47cm, Nagoya 15cm.
- December, 2014 17-18 days: Nagoya 23cm (it is nine years since then), Hiroshima 8cm.
- January, 2015 1-2 days: Kyoto 22cm (it is 61 years since then), Fukui 56cm, Toyooka 42cm.
Source
- JPCZ (Sea of Japan polar air mass convergence zone) weather vocabulary [broken link]
- The first snow of the year that is early in Tateyama .2 joint
- A whirlpool line of the メソ β scale to develop along this sea polar air mass convergence zone belt of clouds: Collection of numerical value simulation weather magazine 71(1), 43-57, 1993-02-25
Allied item
- Tropical convergence zone
- Snow
- Shear line (Shea line, front (weather))
Footnote
- メソ β lower layer whirlpool Meteorological Agency satellite image casebook (PDF) which occurred to a belt-shaped convection cloud in ^ March, 2006
This article is taken from the Japanese Wikipedia Sea of Japan polar air mass convergence zone
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