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
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.
吴蒙, 罗云, 吴兑, 范绍佳. 珠三角干季海陆风特征及其对空气质量影响的观测[J]. 中国环境科学, 2016, 36(11): 3263-3272.
WU Meng, LUO Yun, WU Dui, FAN Shao-jia. Observation on the characteristics of sea-land breezes and its influence to air quality over Pearl River Delta region during dry season. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(11): 3263-3272.
Ozoe H, Shibata T, Hayatoshi S, et al. Characteristics of air pollution in the presence of land and sea breeze-a numerical simulation[J]. Atmospheric Environment (1967), 1983,17(1):35-42.
[4]
刘丽.东南沿海污染气象特征及生物气溶胶的扩散模拟研究[D]. 南京:南京大学, 2011.
[5]
Puygrenier V, Lohou F, Campistron B, et al. Investigation on the fine structure of sea-breeze during escompte experiment[J]. Atmospheric Research, 2005,74(1):329-353.
[6]
Lu R, Turco R P. Air Pollutant transport in a coastal environment-ii. Three-dimensional simulations over Los Angeles Basin[J]. Atmospheric Environment, 1995,(13):1499-1518.
[7]
Viana M, Hammingh P, Colette A, et al. Impact of maritime transport emissions on coastal air quality in Europe[J]. Atmospheric Environment, 2014,(90):96-105.
[8]
Nester K. Influence of sea breeze flows on air pollution over the Attica Peninsula[J]. Atmospheric Environment, 1995,(24):3655-3670.
[9]
Puygrenier V, Lohou F, Campistron B, et al. Investigation on the fine structure of sea-breeze during escompte experiment[J]. Atmospheric Research, 2005,(1):329-353.
[10]
Day B M, Rappenglück B, Clements C B, et al. Nocturnal boundary layer characteristics and land breeze development in Houston, Texas During Texaqs Ii[J]. Atmospheric Environment, 2010,(33):4014-4023.
[11]
Luria M, Almog H, Peleg M. Transport and transformation of air pollutants from Israel's coastal area[J]. Atmospheric Environment (1967), 1984,(10):2215-2221.
[12]
Evtyugina M G, Nunes T, Pio C, et al. Photochemical Pollution under sea breeze conditions, during summer, at the Portuguese West Coast[J]. Atmospheric Environment, 2006,(33):6277-6293.
[13]
Kitada T, Kitagawa E. Numerical analysis of the role of sea breeze fronts on air quality in coastal and inland polluted areas[J]. Atmospheric Environment. Part A. General Topics, 1990,(6):1545-1559.
[14]
Pasch A N, Macdonald C P, Gilliam R C, et al. Meteorological characteristics associated with Pm2.5 air pollution in Cleveland, Ohio, During the 2009~2010 Cleveland Multiple Air Pollutants Study[J]. Atmospheric Environment, 2011,(39):7026-7035.
Liu H, Chan J C. An investigation of air-pollutant patterns under sea-land breezes during a severe air-pollution episode in Hong Kong[J]. Atmospheric Environment, 2002,(4):591-601.
[18]
Ding A, Wang T, Zhao M, et al. Simulation of sea-land breezes and a discussion of their implications on the transport of Air pollution during a multi-day ozone episode in the Pearl River Delta of China[J]. Atmospheric Environment, 2004,(39):6737-6750.
Lin W S, Wang A Y, Wu C S, et al. A case modeling of sea-land breeze in Macao and its neighborhood[J]. Advances in Atmospheric Sciences, 2001,(6):1231-1240.
[22]
Ding A, Wang T, Zhao M, et al. Simulation of sea-land breezes and a discussion of their implications on the transport of air pollution during a multi-day ozone episode in the Pearl River Delta of China[J]. Atmospheric Environment, 2004,(39):6737-6750.
Allwine K, Whiteman C. Single-station Integral Measures of Atmospheric Stagnation, Recirculation and Ventilation[J]. Atmospheric Environment, 1994,(4):713-721.
[29]
Neumann J. On the rotation rate of the direction of sea and land breezes[J]. Journal of Atomosphric Science, 1977,(34):1913-1917.