Atmos. Chem. Phys. Discuss., 13, 6035-6066, 2013
www.atmos-chem-phys-discuss.net/13/6035/2013/
doi:10.5194/acpd-13-6035-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Study on the atmospheric boundary layer and its influence on regional air quality over the Pearl River delta
M. Wu1, D. Wu1,2, Q. Fan1, B. M. Wang1, H. W. Li1, and S. J. Fan1
1School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China
2Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou, 510080, China

Abstract. To study the structure of atmospheric boundary layer (ABL) and its influence on regional air quality over the Pearl River delta (PRD), two ABL intensive observations were conducted at Panyu (urban station) and Xinken (non-urban station, near estuary) of PRD during October 2004 and July 2006, respectively. Based on the ABL intensive observation data analysis, the typical weather condition type associated with poor air quality over PRD could be summarized into two kinds: the warmed period before cold front (WPBCF) and the subsidence period controlled by tropical cyclone (SPCTC). Two typical polluted cases (affected by WPBCF and SPCTC, respectively) and one clean (not-polluted) case were chosen for detail analysis. It was found that the continuously low or calm ground wind would lead to pollutant accumulation. The local circulation, such as sea–land breezes and heat–island circulation, played an important role in these polluted cases. The recirculation was significant in polluted cases; steady transport occurred in the clean case. Ventilation index (VI) was quite different between polluted cases and the clean case: in WPBCF cases, the peak VI was from 184 to 3555 m2 s−1; on SPCTC days, the peak VI was from 1066 to 4363 m2 s−1; on the clean day, the peak VI was 10 885 m2 s−1 and much larger than all polluted cases. The 24-h average VI on polluted days was from 169 to 2858 m2 s−1 and also much smaller than that of the clean day. VI is a good reference index for pollution judgment. The peak mixing heights were smaller than 700 m in WPBCF cases, and were smaller than 800 m in SPCTC cases. During WPBCF polluted case, only surface inversion layer appeared. In the period of land breeze, surface inversion layer height was about 50 m, but in the period of sea breeze, surface inversion layer height would increase, and reach the maximum height, which was about 600 m. During SPCTC polluted case, there were several inversion layers that appeared at different heights. The lowest was about 50 m, the highest about 800 m, with the vertical temperature profile quite complex.

Citation: Wu, M., Wu, D., Fan, Q., Wang, B. M., Li, H. W., and Fan, S. J.: Study on the atmospheric boundary layer and its influence on regional air quality over the Pearl River delta, Atmos. Chem. Phys. Discuss., 13, 6035-6066, doi:10.5194/acpd-13-6035-2013, 2013.
 
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