Transport Condition of Surface Layer Under Haze Weather over the Pearl River Delta

Wu Dui; Liao Guoliang; Deng Xuejiao; Bi Xueyan; Tan Haobo; Li Fei; Jiang Chenglin; Xia Dong; Fan Shaojia

Vol.19, NO.1, 2008

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2008 > 19(1): 1-9

Wu Dui, Liao Guoliang, Deng Xuejiao, et al. Transport condition of surface layer under haze weather over the Pearl River Delta. J Appl Meteor Sci, 2008, 19(1): 1-9.

Citation:

Wu Dui, Liao Guoliang, Deng Xuejiao, et al. Transport condition of surface layer under haze weather over the Pearl River Delta. J Appl Meteor Sci, 2008, 19(1): 1-9.

Wu Dui, Liao Guoliang, Deng Xuejiao, et al. Transport condition of surface layer under haze weather over the Pearl River Delta. J Appl Meteor Sci, 2008, 19(1): 1-9.

Citation:

Wu Dui, Liao Guoliang, Deng Xuejiao, et al. Transport condition of surface layer under haze weather over the Pearl River Delta. J Appl Meteor Sci, 2008, 19(1): 1-9.

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Transport Condition of Surface Layer Under Haze Weather over the Pearl River Delta

1.
Institute of Tropical and Marine Meteorology, CMA, Guangzhou 510080
2.
Department of Atmospheric Science, School of Environmental Science and Engineer, Sun Yai-sen University, Guangzhou 510275

Received Date: 2006-08-18
Rev Recd Date: 2007-07-09
Publish Date: 2008-02-29

Abstract

Abstract

In recent years, the aerosol pollution over the Pearl River Delta (PRD) region is getting worse, resulting in haze weather with visibility decreasing and air quality deterioration. The surface layer transport condition such as airflow is closely related to the dilution and diffusion of atmospheric pollutants. By using statistic method under a set standard based on dataset from 466 Guangdong provincial surface automatic weather stations, Guangzhou operational weather stations, visibility data of PRD's atmospheric component observational network, and PM₁₀ data of PRD's urban environmental observational network, typical haze weather and cleaning weather processes are analyzed in 2004 and 2005. The surface wind and its effect on heavy haze and cleaning weather processes are analyzed using Vector Sum Technique. The zonal circulation over Eastern Asia in favorite haze season in 2004 is stronger than that in 2005. The year with weak zonal circulation has marked exchange between the north and the south, allowing much cold air to cross Nanling Mountain to reach PRD, the accompanying strong wind is favor for the diffusion of the pollutants. In the year with strong zonal circulation cold air has little chance to cross Nanling Mountain to reach PRD so that the pollutants accumulate much easily. The haze weather over PRD has the regional features with the most likely occurrences in dry season and the least in rainy season. The haze processes often happen from October to next April, while cleaning processes often occur in the seasons when typhoon or cold air is prone to occurrence. Compared to 2004, the frequency of still wind is lower and the wind speed in dry season is larger in 2005, those factors are not favor for the form of haze weather. Analysis using Vector Sum Technique shows that regional haze process is closely related to the regional still wind process by which formation of airflow stagnation area is led to, while cleaning process is related to strong advection transport.
- the Pearl River Delta;
- haze weather;
- transport condition;
- vector sum;
- airflow stagnation area

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References(15)

Figures and Tables

图 1 计算水平空间矢量和示意图

Fig. 1 Derived horizontal spatial vectors and schematic diagram

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图 2 亚洲纬向环流指数序列

Fig. 2 Series of zonal circulation indexes for Asia

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图 3 2004年和2005年广州平均风速变化

Fig. 3 Variation of mean wind speed in Guangzhou during 2004—2005

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图 4 2004年珠江三角洲平均流场 (单位: m·s^-1)

Fig. 4 Mean stream field of the Pearl River Delta in 2004 (unit: m·s^-1)

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图 5 2005年珠江三角洲平均流场 (单位: m/s)

Fig. 5 Same as in Fig.4, but for the year of 2005

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图 6 广州严重霾日的逐月变化

(能见度<5 km, 相对湿度<90%)

Fig. 6 Monthly variation of serious hazy days in Guangzhou

(visibility <5 km, relative humidity <90%)

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图 7 2004年1月1—13日 (a) 和2005年11月12—24日 (b) 珠江三角洲日平均风速与广州V_API的点聚图

Fig. 7 Scatter diagram for diurnal mean wind speed in the Pearl River Delta and V_API in Guangzhou during Jan 1—13, 2004 (a) and Nov 12—24, 2005 (b)

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图 8 风的120 h矢量和 (a) 2004年1月5—9日, (b) 2005年11月16—20日 (单位: m·s^-1)

Fig. 8 Sum of wind vectors for 120 hours during Jan 5—9, 2004 (a) and Nov 16—20, 2005 (b)(unit : m·s^-1)

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表 1 2004年、2005年珠江三角洲6城市霾日数 (单位: d)

Table 1 Number of hazy days for six cities in the Pearl River Delta in 2004 and 2005 (unit:d)

表 2 典型霾天气过程的选取

Table 2 Selection of weather processes for typical hazy weather

表 3 清洁对照天气过程的选取

Table 3 Selection of weather processes for clean control

表 4 典型霾天气过程的选取 (V_API=73.9)

Table 4 Same as in Table 2, but for V_API=73.9

表 5 清洁对照天气过程的选取 (V_API=73.9)

Table 5 Same as in Table 3, but for V_API=73.9

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