Journal
ATMOSPHERIC RESEARCH
Volume 101, Issue 3, Pages 681-691Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.atmosres.2011.04.016
Keywords
Visibility; Extinction coefficient; PM10; Meteorological parameter; Principal component analysis; Nanjing
Categories
Funding
- National Special Fund for the Weather Industry [GYHY200806001]
- Major Science and Technology Program for Water Pollution Control and Treatment [2008ZX07103-007]
- National Key Basic Research Development Program of China [2010CB428503, 2011CB403406]
- National Natural Science Foundation of China [40805059]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [200802841021]
- Ministry of Science and Technology of China [2010DFA22770]
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Visibility, Air Pollution Index (API) and meteorological parameters over Nanjing during 2004 are analyzed using multiple statistic methods to study the characterization of visibility and relevant affecting factors. The mean value of visibility during the study year is 8.8 km, with 57.9% of daily average less than 10 km. Annual average visibility exhibits a significant diurnal variation with minimum of 6.6 km at 07:00 Local Time (LT) and maximum of 10.7 km at 16:00 LT. Seasonal variations is weak: 9.2 km in spring (March-May), 9.8 km in summer (June-August), 8.2 km in autumn (September-November), and 8.1 km in winter (December-February), respectively. No significant weekend effect in visibility is found. Moreover, wavelet analysis reveals the significant periodic variations in visibility, with major periods of synoptic scale (2-8 days), and quasi-two-week scale (8-17 days). Using a high pass filtering technique to eliminate the seasonal trend, correlation analysis and principal component analysis (PCA) are carried out to investigate the relations between visibility and relevant factors and to understand the dominated processes/causes to the synoptic changes in visibility. Our results highlight the significant impact of synoptic weather on air pollution and visibility in Nanjing. (C) 2011 Elsevier B.V. All rights reserved.
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