Long-term visibility variation in Athens (1931–2013): a proxy forlocal and regional atmospheric aerosol loads

doi:10.5194/acp-16-11219-2016

GSTDTAP > 地球科学

DOI	10.5194/acp-16-11219-2016
	Long-term visibility variation in Athens (1931–2013): a proxy forlocal and regional atmospheric aerosol loads
	Dimitra Founda, Stelios Kazadzis, Nikolaos Mihalopoulos, Evangelos Gerasopoulos, Maria Lianou, and Panagiotis I. Raptis
	2016-09-12
发表期刊	Atmospheric Chemistry and Physics
出版年	2016
英文摘要	This study explores the interdecadal variability and trends of surface horizontal visibility at the urban area of Athens from 1931 to 2013, using the historical archives of the National Observatory of Athens (NOA). A prominent deterioration of visibility in the city was detected, with the long-term linear trend amounting to −2.8 km decade⁻¹ (p < 0.001), over the entire study period. This was not accompanied by any significant trend in relative humidity or precipitation over the same period. A slight recovery of visibility levels seems to be established in the recent decade (2004–2013). It was found that very good visibility (>  20 km) occurred at a frequency of 34 % before the 1950s, while this percentage drops to just 2 % during the decade 2004–2013. The rapid impairment of the visual air quality in Athens around the 1950s points to the increased levels of air pollution on a local and/or regional scale, related to high urbanization rates and/or increased anthropogenic emissions on a global scale at that period. Visibility was found to be negatively/positively correlated with relative humidity/wind speed, the correlation being statistically valid at certain periods. Wind regime and mainly wind direction and corresponding air mass origin were found to highly control visibility levels in Athens. The comparison of visibility variation in Athens and at a non-urban reference site on Crete island revealed similar negative trends over the common period of observations. This suggests that apart local sources, visibility in Athens is highly determined by aerosol load of regional origin. AVHRR and MODIS satellite-derived aerosol optical depth (AOD) retrievals over Athens and surface measurements of PM₁₀ confirmed the relation of visibility to aerosol load.
领域	地球科学
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/287930
专题	地球科学
推荐引用方式 GB/T 7714	Dimitra Founda, Stelios Kazadzis, Nikolaos Mihalopoulos, Evangelos Gerasopoulos, Maria Lianou, and Panagiotis I. Raptis. Long-term visibility variation in Athens (1931–2013): a proxy forlocal and regional atmospheric aerosol loads[J]. Atmospheric Chemistry and Physics,2016.
APA	Dimitra Founda, Stelios Kazadzis, Nikolaos Mihalopoulos, Evangelos Gerasopoulos, Maria Lianou, and Panagiotis I. Raptis.(2016).Long-term visibility variation in Athens (1931–2013): a proxy forlocal and regional atmospheric aerosol loads.Atmospheric Chemistry and Physics.
MLA	Dimitra Founda, Stelios Kazadzis, Nikolaos Mihalopoulos, Evangelos Gerasopoulos, Maria Lianou, and Panagiotis I. Raptis."Long-term visibility variation in Athens (1931–2013): a proxy forlocal and regional atmospheric aerosol loads".Atmospheric Chemistry and Physics (2016).