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Comparative study on long-term visibility trend and its affecting factors on both sides of the Taiwan Strait

机译：台湾海峡两岸长期能见度趋势及其影响因素的比较研究

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The rapid industrial development and urbanization has lead to increasing particulate matter pollution in the Cross Taiwan Strait Region, which has significant impacts on atmospheric visibility degradation. Long-term visibility trends in five typical cities over the cross-strait region (i.e., Xiamen and Fuzhou in the Western Taiwan Strait (WTS) region and Taipei, Taichung and Tainan in Taiwan) and its correlation with air quality and meteorological conditions were investigated using visibility and meteorological data during 1973-2011 and air pollution data during 2009-2011. For the entire period, the overall average visibilities in the WTS region were better than those in Taiwan, with an average of 16.8, 16.6, 8.5, 10.3 and 9.0 km in Fuzhou, Xiamen, Taipei, Taichung and Tainan, respectively. Decline trends with decreasing rates of -0.5-0.1 km/yr existed in all cities except Taipei, which had an improvement in visibility after 1992. All seasons had decreasing trends during the 39-year period except in Taipei. The WTS region had the worse change trend compared with Taiwan. No statistically significant weekend effect in visibility is found over the region. Visibilities were better in summer and autumn, while worse in winter and spring. Correlation analysis revealed that significant negative correlations existed between visibility and NO_2 and airborne particles (i.e., PM_(10) and PM_(2.5)); PM_(2.5) played an important role in visibility degradation. High temperature and low pressure is beneficial for better visibility. Principal component analysis further confirmed the impacts of high concentrations of air pollutants, stable synoptic systems and humid air with high relative humidity on visibility impairment In addition, case studies highlighted characteristics and potential causes of typical regional low visibility episodes over the region.
机译：快速的工业发展和城市化进程导致台湾海峡两岸地区的颗粒物污染增加，这对大气能见度的下降具有重大影响。研究了两岸五个典型城市（即台湾海峡西部的厦门和福州以及台湾的台北，台中和台南）的长期能见度趋势及其与空气质量和气象条件的相关性使用1973-2011年期间的能见度和气象数据以及2009-2011年期间的空气污染数据。在整个期间，WTS地区的整体平均能见度要好于台湾，福州，厦门，台北，台中和台南的平均能见度分别为16.8、16.6、8.5、10.3和9.0公里。除台北市外，所有城市都存在以-0.5-0.1 km / yr的速度下降的下降趋势，但台北市在1992年后能见度有所提高。在39年期间，除台北市外，所有季节均呈下降趋势。与台湾相比，WTS地区的变化趋势更糟。在该地区，未发现能见度的统计显着性周末影响。夏季和秋季的能见度更好，而冬季和春季则更差。相关性分析表明，能见度与NO_2和空气中的颗粒物（即PM_（10）和PM_（2.5））之间存在显着的负相关性。 PM_（2.5）在能见度降低中起重要作用。高温和低压有利于获得更好的可视性。主成分分析进一步证实了高浓度的空气污染物，稳定的天气系统和高相对湿度的潮湿空气对能见度的影响。此外，案例研究突出了该地区典型的区域性低能见度事件的特征和潜在原因。

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