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首页> 外文期刊>ournal of the Meteorological Society of Japan >Characteristics of the Yamase Winds over Oceans around Japan Observed by the Scatterometer-Derived Ocean Surface Vector Winds
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Characteristics of the Yamase Winds over Oceans around Japan Observed by the Scatterometer-Derived Ocean Surface Vector Winds

机译：散射计派生的海洋表面矢量风观测到的日本大洋上的雅马斯风特征

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摘要

Yamase is the name for local northeasterly winds that blow from the Pacific Ocean to the east coastsof Hokkaido, and the Tohoku District from May to August. They are cool and moist winds accompanied by low-level clouds. In the present study, we investigate the Yamase winds over the oceans around Japan, using ocean surface vector winds observed by a satellite-scatterometer. In order to define the Yamase Phenomena, we employed an Empirical Orthogonal Function (EOF) analysis of the AMeDAS surface air temperatures over the Tohoku District from May to August. Daily mean temperature anomaly (ΔT), which is a deviation from the climatological daily mean temperature, is calculated for the 167 AMeDAS stations. The spatial coeflicient function of the EOF first mode (EOF1), shows synchronous temperature changes in the whole Tohoku District, while that of the EOF second mode (EOF2), shows a seesaw pattern of temperature variation, between the Pacific and Japan Sea sides. The EOF-decomposed temperature variation, and ΔT at the Hachinohe station (a Yamase index), has high correlations; for EOF1, the correlation is 0.78, and for EOF1+2, it becomes 0.89. The Yamase Phenomena represented by the Hachinohe negative ΔT, is thus associated with two different patterns of the temperature variations in the Tohoku District.The composite wind map made through the sampling of days, with the Hachinohe ΔT −2°C, shows northeasterly ocean winds blowing toward the Sanriku coast, an anti-cyclonic circulation center in the eastern Okhotsk Sea, and northeasterly surface winds along the Kuril Islands. When the winds approach the Tohoku District in the Pacific Ocean, they separate two flows around 40°N off Miyako. The surface wind fields associated with the cold phenomena of EOF1 and EOF2 corresponding to the Hachinohe negative ΔT are different. The former indicates the northeasterly wind blowing toward the Sanriku coast, and the latter that the northeasterly winds from the sea south of the Kuril Islands, change their direction around 145°E and the easterly winds blow toward the Sanriku coast. The Kitakami Mountains influence significantly on the Yamase winds, over the coastal Pacific Ocean.
机译：Yamase是当地东北风的名字，5月至8月从太平洋吹到北海道的东海岸和东北地区。它们是凉爽潮湿的风，伴有低云。在本研究中，我们使用卫星散射仪观测到的海面矢量风，调查了日本周围海洋上的Yamase风。为了定义Yamase现象，我们对东北地区5月至8月的AMeDAS地表气温进行了经验正交函数（EOF）分析。计算了167个AMeDAS站点的日平均温度距平（ΔT），这是与气候日平均温度的偏差。 EOF第一模式（EOF1）的空间系数函数显示整个东北地区的同步温度变化，而EOF第二模式（EOF2）的空间系数函数显示太平洋和日本海侧之间的温度变化的跷跷板模式。 EOF分解的温度变化与八户站的ΔT（Yamase指数）具有很高的相关性。对于EOF1，相关系数为0.78，对于EOF1 + 2，相关系数为0.89。因此，以八户负ΔT代表的Yamase现象与东北地区的两种不同的温度变化模式相关联。通过天数采样制成的复合风图，八户ΔT<-2°C，显示东北海风力吹向鄂霍次克海东部的反气旋循环中心Sanriku海岸，而沿千岛群岛则为东北风。当风吹向太平洋东北地区时，它们将在宫古岛附近40°N附近的两条气流分开。与八户负ΔT相对应的EOF1和EOF2的冷现象相关的表面风场不同。前者表示向三陆海岸吹来的东北风，而后者表示从千岛群岛以南的海向北吹来的风向在145°E附近改变了方向，而东风则吹向了三陆海岸。北上市山脉对沿海太平洋的山濑风产生重大影响。

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