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| Analysis of visibility characteristics and connecting factors over the Yangtze River Delta Region during winter time |
| ZHOU Yi-ke1,2, ZHU Bin1,2, HAN Zhi-wei3, PAN Chen1,2, GUO Ting1,2, WEI Jian-su4, LIU Duan-yang4 |
1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China;
3. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;
4. Meteorological Observatory of Jiangsu Province, Nanjing 210008, China |
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Abstract Based on the meteorological data from 28 observation stations in winter 2013 and 2014, NCEP FNL reanalysis data and ground PM2.5 observations, the characteristic of visibility and its relationship with air pollutants and meteorological conditions in the Yangtze River Delta in winter were analyzed. In winter 2013, the frequency of haze day was 53.4%. 81.6% of the visibility change can be explained by PM2.5 concentration, 10m wind speed, wind shear (500~850hPa), relative humidity, temperature difference (925~1000hPa), potential pseudo-equivalent temperature difference (850~925hPa). The effects of meteorological conditions and air pollutants on visibility were comparable, and the contribution of thermal factor was almost twice that of dynamical factor. The RH impact on visibility was stronger at lower PM2.5 concentration and higher RH (>70%). The visibility in winter 2014 was well reproduced by the nonlinear regression equation.
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Received: 20 August 2015
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