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湖泊科学  1993 

陆地水体对周围空气比湿影响的初步研究

DOI: 10.18307/1993.0401

Keywords: 陆地水体,空气比湿,空间分布,数值模拟

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Abstract:

通过建立一个包含比较详细的地面和水体内物理过程的非静力近似中小尺度数值模式,模拟陆地水体对周围空气比湿影响的空间分布,模拟结果与实际情况比较接近。计算结果表明:水体在冬季和夏季都增加周围空气的比湿;增加的幅度是晴天大于阴天、夜间大于白天、冬季大于夏季;仅在夏季晴天正午时,由于水体强烈降温,近水面大气层结很稳定,水体附近空气比湿略有降低。空气比湿的改变主要发生在气流刚过水面的2—3km范围内;在岸上水体影响接近指数律减小,水体对空气比湿影响消失的距离为:在上风岸不到4km,下风岸可超过20km;水体影响空气比湿的高度为200—400m。

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