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| Observation on the characteristics of sea-land breezes and its influence to air quality over Pearl River Delta region during dry season |
| WU Meng1,2,3, LUO Yun2,3, WU Dui1,4, FAN Shao-jia1 |
1. School of Atmospheric Science, SunYat-sen University, Guangzhou 510275;
2. FoshanMeteorological Bureau, Foshan 528000;
3. Tornadoes Research Center of Foshan, Foshan 528000;
4. Institute of Atmospheric Environmental Safety and Pollution Control, Jinan University, Guangzhou 510080, China |
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Abstract Based on the sounding data obtained from the boundary layer observation experiment over Pearl River Delta (PRD) region during October 2004 and the corresponding hourly PM2.5 data, the characteristics of sea-land breezes and its influenceson quality over PRD region were discussed by Recirculation Factor (RF) and other methods. Recirculation factor was a useful tool to represent the atmospheric horizontal transmission capacity.With the influence of the cold air and warm air confront with each other during pollution days, the sea-land breezes occurred frequently as a result of the weak system wind, and air quality index had significant relation with the RF, the RF of 100~400m was about 0.5~0.8. The horizontal transmission capacity of vertical wind field was weak under the influence of sea-land breezes, not conducive to the spread of pollutants. As PRD controlled by cold air overall, the RF of vertical windreach up to 0.9, and sea-land breezes circulation was hard to developing,so the horizontal transmissions capacity was powerful and the pollutants could be spread effectually. Among the observations, the frequency of sea-land breezes was about 47.8% at the coastal station, and the 72.7% of sea-land breezes day was pollution day, the wind directionhad visible change in clockwise over time. The sea breeze occurred in 16:00, and reached the maximum in 20:00 with the influence height was about 600~800m. In the night, sea breeze may transport the pollutants back to inland, and gave rise to a peak value of PM2.5 concentration appeared at 19:00 to 21:00 in inland station.
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Received: 28 March 2016
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