| 摘要: |
| 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。 |
| 关键词: 陆地水体 空气比湿 空间分布 数值模拟 |
| DOI：10.18307/1993.0401 |
| 分类号: |
| 基金项目:国家自然科学基金 (NO:49175243) |
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| Effects of inland water body on ambient air specific humidity |
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Wang Hao, Fu Baopu
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Department of Atmospheric Sciences, Nanjing University, Nanjing 210008
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| Abstract: |
| A non-hydrostatie meso-and micro-scale numerical model including detailed physica process both on ground surface an d in water is developed to sim ulate the distribution of the air specific humidity in the vicinity inlan d water body. The results are in agreement w ith observed data show ing that in the vicinity of water body , air specific hum idity increasea both in summer and in whiter, and the increasing ran ge is greater in winter than in sum mer.in sunny day than in cloudy day, and in nightthne than in daytime.When airflow passes through water body, the chan ge of air specific hum idity mainly occurs within original 2- 3km. Accordin g to power rule on both shores, the air specific hum idity approaches to that over land, w ithin 4 km on the win dward shore and beyond 20 km oii the leeward shore, the top. altitude where water body m ay affect air specific humidity is 200-doom . |
| Key words: Inland waterbody air specific humidity spatial distribution numerical modeling |
