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Analysis of the Climate Characteristics and Influencing Factors of Fog/Haze in Beijing Area

机译：北京地区雾/雾霾气候特征及影响因素分析

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摘要

This paper analyzed the climate characteristic and influencing factors of fog and haze in Beijing area. The results showed that the variations of fog and haze days had obvious two-stage characteristics. Between 1980 and 1996, fog days varied with a significant upward trend, while between 1997 and 2010 were with significant downtrend. Haze days decreased in each of the two stages, but after 1997, the average haze days were still higher than that before 1996. Besides, monthly fog days changed significantly, highest from October to December, but monthly haze days were relatively uniform. From the view of spatial distribution, fog and haze had serious influence to the southeast of Beijing area, but had the least influence on the northwest. A case of a sustained fog and haze from November 3 to 8 2009 was examined for a detailed analysis of the influencing factors. The increase of PM2.5 concentration was the main factors reducing haze visibility at the beginning stage in which haze dominated; while relative humidity was the main factors leading to low visibility during the next stage when haze changed into heavy fog. Fog/haze dissipated due to the intrusion of northern cold air.
机译：本文分析了北京地区雾与阴霾的气候特性及影响因素。结果表明，雾和阴霾天的变化具有明显的两级特征。在1980年至1996年期间，雾天随着一个重要的上升趋势而变化，而1997年至2010年间则具有重要的趋势。阴霾日在两个阶段中的每一个减少，但在1997年之后，平均阴霾日仍然高于1996年之前的疫苗日。此外，每月雾天显着变化，从10月到12月的最高日，但月的阴霾日相对均匀。从空间分布的看法，雾和阴霾对北京地区东南部产生了严重影响，但对西北部的影响最小。研究了2009年11月3日至8日从2009年11月3日至8日持续的雾和雾度进行了详细分析了影响因素。 PM2.5浓度的增加是降低雾霾主导的开始阶段的雾度可见度的主要因素;虽然相对湿度是导致下一阶段的最低能见的主要因素，当雾度变成重雾时。由于北方冷空气的侵入，雾/雾霾消散。

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