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大气科学  2008 

离岸型背景风和海陆风对珠江三角洲地区灰霾天气的影响

DOI: 10.3878/j.issn.1006-9895.2008.03.10

Keywords: 背景风,海陆风,灰霾天气,PM10

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Abstract:

不同类型的背景场和海陆风对珠江三角洲地区大气灰霾有不同的影响。作者主要利用空气质量模式系统Models-3(MM5/SMOKE/CMAQ)研究离岸型背景风和海陆风对珠江三角洲一次灰霾天气的影响,结果表明,中尺度气象模式MM5对珠江三角洲地区这次灰霾天气的气象模拟,较好地模拟了风速和风向的变化。多尺度空气质量模式CMAQ模拟出了PM10浓度的变化,与观测值比较一致。在这次灰霾天气过程中,由于离岸型背景风与陆风风向一致,在陆风维持的情况下,内陆源区的PM10被输送到沿海地区,导致沿海城市和海面上PM10浓度比较高;而在海风维持的情况下,海风与离岸型背景风方向相反,造成海风较小,致使整个珠江三角洲地区灰霾天气都比较严重。敏感性试验结果表明离岸背景风和海陆风的相互作用对灰霾天气的生成与分布有重大的影响。

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