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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Spatial Patterns of Winter Precipitation in the North-Central Region (Hokuriku District) of Japan
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Spatial Patterns of Winter Precipitation in the North-Central Region (Hokuriku District) of Japan

机译：日本北部地区冬季降水的空间模式

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This study examines dominant precipitation patterns during winter in the north-central region (Hokuriku District) of Japan, based on empirical orthogonal functions (EOFs) analysis. The pattern of the first leading component is similar to that of the mean precipitation, and the second leading component shows a dipole structure in which positive and negative regions are separated by the coast line. This dipole pattern across the coast line is robust regardless of data stratifications for the EOF calculation. Composites reveal that maritime and inland precipitation is relatively enhanced before and after the passage of a mid-level trough, respectively. In the former case, the temperature is higher and westerly or southwesterly wind prevails, while northwesterly wind dominates in the latter case. It is suggested that interactions between cold air over the land and warm air over the ocean are essentially important to the distinct precipitation patterns; offshore winds wedge the inland cold air under the maritime warm air, and intensifies the precipitation over the ocean. On the other hand, the northwesterly monsoonal flow pushes the maritime warm air onto the inland cold air, and more precipitation is brought about around the mountain range.
机译：本研究根据经验正交功能（EOF）分析，研究了日本北部地区（北区区）的冬季冬季的显着降水模式。第一前导部件的图案类似于平均沉淀的图案，第二领导部件示出了偶极结构，其中正极区域由海岸线分离。无论EOF计算的数据分层如何，海岸线跨越海岸线的偶极模式都是强大的。复合材料揭示了海上和内陆降水分别在中级槽的通过之前和之后相对增强。在前一种情况下，温度较高，温度较高，或向西风普遍存在，而在后一种情况下，华北风占据主导地位。建议，在海洋上冰冷的空气与海洋的暖空气之间的相互作用对不同的沉淀图案至关重要;海上风在海上暖空气下楔入内陆冷空气，并加剧了海洋的降水。另一方面，西北季风流量将海上暖空气推向内陆冷空气，距离山脉周围有更多的沉淀。

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