Comparisons of Meteorological Conditions on Fog, Haze, and Clear Days in Anhui Province, China
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摘要: 使用2008~2012年逐日地面观测资料,揭示了安徽不同地区雾、霾、晴空天气气象条件的差异,指出不同地区要根据本地特点建立雾、霾预报指标和预报方法。3类天气差异最大的地面气象要素是能见度和相对湿度。根据3种天气前一日和当日能见度和相对湿度分布特征,全省站点可以分为3类:1)从雾、霾到晴空,能见度递增、相对湿度递减,且差异显著,如合肥站;2)雾、霾天的能见度和相对湿度均很接近,但与晴空天差别较大,如阜阳站;3)能见度在雾、霾天无明显差别,但相对湿度在雾、霾天差异显著,如安庆站。地级市测站雾后即霾的可能性较大(大于50%),县城测站雾后即霾的可能性较低(低于25%)。垂直方向,雾时相对湿度随高度下降很快,850 hPa中位值已降到20%(安庆)和45%(阜阳)以下,霾时相对湿度随高度下降缓慢,850 hPa中位值仍在60%左右;另外,霾天边界层中上部风切变较小,雾天和晴空天边界层中上部都存在较大的风切变。Abstract: Based on differences in meteorological conditions on fog, haze, and clear days, the authors concluded that the forecasting methods and index of fog and haze should be set up for different regions based on local conditions. Among the surface meteorological parameters, visibility and relative humidity showed the most evident differences in the above-mentioned three weather conditions. According to the visibility and relative humidity at 2000 LST in the preceding day and 1400 LST on the current day, all studied sites in Anhui Province were divided into three categories:1) From fog, haze to clear days, the visibility increased and relative humidity decreased evidently (e.g. Hefei); 2) Visibility and relative humidity both were very close on fog and haze days, but were evidently different from those on clear days (e.g. Fuyang); 3) Visibility showed insignificant differences between fog and haze days, while relative humidity showed evident differences between fog and haze days (e.g. Anqing). More than 50% of fogs were followed by haze at urban sites; while less than 25% of fogs were followed by haze at countryside sites. In the vertical, the relative humidity decreased rapidly with height during fog days, with the median value lower than 20% at 850 hPa at Anqing station and lower than 45% at Fuyang station; however, it decreased slowly during haze days with the median value of around 60% at 850 hPa at both stations. In addition, the wind shear from the middle to upper boundary layer was smaller on haze days than on fog and clear days.
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Key words:
- Fog /
- Haze /
- Meteorological conditions /
- Boundary layer /
- Anhui
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图 2 2008~2012年合肥、阜阳和安庆雾、霾、晴空天前一日20:00能见度、相对湿度分布的箱线图(上下两个横线分别表示最大值和最小值;长方形中的星号表示中值,横线表示均值;长方形的下、上边分别为第一、三四分位值)
Figure 2. Box-plots of ground level visibility and relative humidity at 2000 LST on preceding days of fog, haze, and clear days in Hefei, Fuyang, and Anqing during 2008-2012 (the upper-: maximum; the lower-: minimum; -within the rectangles: mean; * within the rectangles: median; the upper and lower borders of the rectangels: the 25th and 75th percentiles)
图 3 2008~2012年合肥、阜阳和安庆雾、霾、晴空天14:00能见度和相对湿度统计结果(说明同图 2)
Figure 3. Box-plots of ground level visibility and relative humidity at 1400 LST on days of fog, haze, and clear in Hefei, Fuyang, and Anqing during 2008-2012
表 1 分区及统计结果
Table 1. Results of clustering and statistical analysis
子区名称 r COD 区域平均霾日数/d 区域平均能见度/km 平均值 最大值 平均值 最小值 淮北北部 0.70 0.74(蒙城县) 0.19 0.18(蒙城县) 84.0 14.6 沿淮东部 0.69 0.76(蚌埠) 0.22 0.18(定远县) 175.2 12.8 江淮之间 0.67 0.72(巢湖) 0.23 0.19(和县) 157.5 13.2 大别山区 0.68 0.73(怀宁县) 0.15 0.14(太湖县) 89.0 12.7 沿江江南 0.72 0.77(宁国县) 0.22 0.21(芜湖县) 150.9 12.8 江南南部 0.70 0.73(绩溪县) 0.16 0.15(黟县) 18.0 16.8 表 2 重点城市和各代表性站点2008~2012年雾、霾、晴空天的总天数
Table 2. Total numbers of fog, haze, and clear days at each representative station during 2008-2012
站点 天数/d 雾 霾 晴空 阜阳 98 201 513 合肥 90 681 159 安庆 45 184 625 蚌埠 103 479 162 巢湖 35 110 773 蒙城县 121 25 743 怀宁县 78 115 516 宁国县 236 117 317 绩溪县 35 26 683 表 3 2008~2012年安庆和阜阳雾、霾、晴空天08:00不同高度相对湿度中位值和均值
Table 3. Median and mean values of relative humidity at different height at 0800 LST on fog, haze, and clear days in Anqing and Fuyang during 2008-2012
站点 天气类型 600 hPa相对湿度 700 hPa相对湿度 850 hPa相对湿度 925 hPa相对湿度 1000 hPa相对湿度 中位值 均值 中位值 均值 中位值 均值 中位值 均值 中位值 均值 安庆 雾 2.6% 8.6% 4.3% 8.0% 19.5% 28.1% 56.5% 53.3% 92.0% 92.1% 霾 12.4% 18.6% 23.0% 34.1% 58.7% 53.3% 69.7% 62.9% 83.3% 82.2% 晴 15.2% 27.1% 19.7% 32.9% 35.7% 40.5% 51.9% 48.4% 70.9% 67.6% 阜阳 雾 11.0% 19.2% 22.5% 34.3% 42.4% 46.8% 71.8% 64.5% 91.0% 89.6% 霾 23.2% 33.7% 39.7% 43.1% 60.3% 56.4% 71.6% 66.0% 86.0% 84.1% 晴 9.3% 20.0% 11.1% 21.2% 17.7% 25.0% 26.0% 31.6% 48.4% 48.8% -
[1] 安徽省气象局. 2012.安徽省气象志:气候变化与气候区划[M].北京:气象出版社, 375pp.Anhui Provincial Meteorological Bureau. 2012. Anhui Meteorological Records:Climate Change and Climate Divisions (in Chinese)[M]. Beijing:China Meteorological Press, 375pp. [2] 邓学良, 石春娥, 姚晨, 等. 2015.安徽霾日重建和时空特征分析[J].高原气象, 34 (4):1158-1166. doi: 10.7522/j.issn.1000-0534.2014.00007Deng Xueliang, Shi Chun'e, Yao Chen, et al. 2015. Research of reconstruction and characteristics of hazes in Anhui[J]. Plateau Meteorology (in Chinese), 34 (4):1158-1166, doi: 10.7522/j.issn.1000-0534.2014.00007. [3] Gao H W, Chen J, Wang B, et al. 2011. A study of air pollution of city clusters[J]. Atmospheric Environment, 45 (18):3069-3077, doi: 10.1016/j.atmosenv.2011.03.018. [4] 高怡, 张美根. 2014. 2013年1月华北地区重雾霾过程及其成因的模拟分析[J].气候与环境研究, 19 (2):140-152. doi: 10.3878/j.issn.1006-9585.2014.13135Gao Yi, Zhang Meigen. 2014. Numerical simulation of a heavy fog-haze episode over the North China Plain in January 2013[J]. Climatic and Environmental Research (in Chinese), 19 (2):140-152, doi: 10.3878/j.issn.1006-9585.2014.13135. [5] Gultepe I, Tardif R, Michaelides S C, et al. 2007. Fog research:A review of past achievements and future perspectives[J]. Pure and Applied Geophysics, 164 (6-7):1121-1159, doi: 10.1007/s00024-007-0211-x. [6] Kang H Q, Zhu B, Zhu T, et al. 2014. Impact of megacity Shanghai on the urban heat-island effects over the downstream city Kunshan[J]. Boundary-Layer Meteorology, 152 (3):411-426, doi: 10.1007/s10546-014-9927-1. [7] 雷孝恩. 1983.风垂直切变对中距离扩散特征的影响[J].大气科学, 7 (2):171-178. doi: 10.3878/j.issn.1006-9895.1983.02.07Lei Xiao'en. 1983. Effect of wind vertical shear on diffusion characteristics in the mesoscale range[J]. Scientia Atmospheric Sinica (in Chinese), 7 (2):171-178, doi:10.3878/j.issn.1006-9895.1983. 02.07. [8] Li Z H, Yang J, Shi C E, et al. 2012. Urbanization effects on fog in China:Field research and modeling[J]. Pure and Applied Geophysics, 169 (5-6):927-939, doi: 10.1007/s00024-011-0356-5. [9] 刘瑞婷, 韩志伟, 李嘉伟. 2014.北京冬季雾霾事件的气象特征分析[J].气候与环境研究, 19 (2):164-172. doi: 10.3878/j.issn.1006-9585.2014.13224Liu Ruiting, Han Zhiwei, Li Jiawei. 2014. Analysis of meteorological characteristics during winter haze events in Beijing[J]. Climatic and Environmental Research (in Chinese), 19 (2):164-172, doi: 10.3878/j.issn.1006-9585.2014.13224. [10] Shi C E, Roth M, Zhang H, et al. 2008. Impacts of urbanization on long-term variation of fog in Anhui Province, China[J]. Atmospheric Environment, 42 (36):8484-8492, doi:10.1016/j.atmosenv.2008.08. 002. [11] 石春娥, 吴照宪, 邓学良, 等. 2013. MM5与MM5-PAFOG模式区域雾预报效果评估比较[J].高原气象, 32 (5):1349-1359. doi: 10.7522/j.issn.1000-0534.2012.00126Shi Chun'e, Wu Zhaoxian, Deng Xueliang, et al. 2013. Validation and comparison of regional fog forecast by MM5 and MM5-PAFOG models[J]. Plateau Meteorology (in Chinese), 32 (5):1349-1359, doi: 10.7522/j.issn.1000-0534.2012.00126. [12] 石春娥, 邓学良, 杨元建, 等. 2014. 2013年1月安徽持续性霾天气成因分析[J].气候与环境研究, 19 (2):227-236. doi: 10.3878/j.issn.1006-9585.2014.13112Shi Chun'e, Deng Xueliang, Yang Yuanjian, et al. 2014. Analyses on the causes of the persistent haze in Anhui Province in January 2013[J]. Climatic and Environmental Research (in Chinese), 19 (2):227-236, doi:10.3878/j.issn. 1006-9585.2014.13112. [13] 石春娥, 王喜全, 李元妮, 等. 2016. 1980~2013年安徽霾天气变化趋势及可能成因[J].大气科学, 40 (2):357-370. doi: 10.3878/j.issn.1006-9895.1504.14319Shi Chun'e, Wang Xiquan, LiYuanni, et al. 2016. The trend of haze in Anhui Province from 1980 to 2013 and the possible reasons[J]. Chinese Journal of Atmospheric Sciences (in Chinese), 40 (2):357-370, doi:10.3878/j.issn.1006-9895. 1504.14319. [14] Steeneveld G J, Ronda R J, Holtslag A A M. 2015. The challenge of forecasting the onset and development of radiation fog using mesoscale atmospheric models[J]. Boundary-Layer Meteorology, 154 (2):265-289, doi: 10.1007/s10546-014-9973-8. [15] 王喜全, 杨婷, 王自发. 2011.灰霾污染的跨控制区影响-一次京津冀与东北地区灰霾污染个案分析[J].气候与环境研究, 16 (6):690-696. doi: 10.3878/j.issn.1006-9585.2011.06.02Wang Xiquan, Yang Ting, Wang Zifa. 2011. Impact of dust-haze episode from one air pollution control region to the other-one case study[J]. Climatic and Environmental Research (in Chinese), 16 (6):690-696, doi: 10.3878/j.issn.1006-9585.2011.06.02. [16] 王喜全, 孙明生, 杨婷, 等. 2013.京津冀平原地区灰霾天气的年代变化[J].气候与环境研究, 18 (2):165-170. doi: 10.3878/j.issn.1006-9585.2012.11094Wang Xiquan, Sun Mingsheng, Yang Ting, et al. 2013. Interdecadal change in frequency of dust-haze episodes in North China Plain[J]. Climatic and Environmental Research (in Chinese), 18 (2):165-170, doi: 10.3878/j.issn.1006-9585.2012.11094. [17] 王跃思, 姚莉, 王莉莉, 等. 2014. 2013年元月我国中东部地区强霾污染成因分析[J].中国科学:地球科学, 44 (1):15-26. doi: 10.1007/s11430-013-4773-4Wang Yuesi, Yao Li, Wang Lili, et al. 2014. Mechanism for the formation of the January 2013 heavy haze pollution episode over central and eastern China[J]. Science China (Earth Sciences), 57 (1):14-25, doi: 10.1007/s11430-013-4773-4. [18] 王自发, 李杰, 王哲, 等. 2014. 2013年1月我国中东部强霾污染的数值模拟和防控对策[J].中国科学:地球科学, 44 (1):3-14. doi: 10.1007/s11430-013-4793-0Wang Zifa, Li Jie, Wang Zhe, et al. 2014. Modeling study of regional severe hazes over mid-eastern China in January 2013 and its implications on pollution prevention and control[J]. Science China Earth Sciences, 57 (1):3-13, doi: 10.1007/s11430-013-4793-0. [19] 魏文华, 王体健, 石春娥, 等. 2012.合肥市雾日气象条件分析[J].气象科学, 32 (4):437-442. doi: 10.3969/2012jms.0074Wei Wenhua, Wang Tijian, Shi Chun'e, et al. 2012. Analysis of weather conditions for fog in Hefei[J]. Journal of the Meteorological Sciences (in Chinese), 32 (4):437-442, doi: 10.3969/2012jms.0074. [20] 吴兑, 吴晓京, 李菲, 等. 2010. 1951~2005年中国大陆霾的时空变化[J].气象学报, 68 (5):680-688. doi: 10.11676/qxxb2010.066Wu Dui, Wu Xiaojing, Li Fei, et al. 2010. Temporal and spatial variation of haze during 1951-2005 in Chinese mainland[J]. Acta Meteorologica Sinica (in Chinese), 68 (5):680-688, doi: 10.11676/qxxb2010.066. [21] 吴兑. 2013.探秘PM2.5[M].北京:气象出版社, 106pp.Wu Dui. Insights into PM2.5 (in Chinese)[M]. Beijing:China Meteorological Press, 106pp. [22] 杨军, 牛忠清, 石春娥, 等. 2010.南京冬季雾霾过程中气溶胶粒子的微物理特征[J].环境科学, 31 (7):1425-1431. http://www.cnki.com.cn/Article/CJFDTOTAL-HJKZ201007005.htmYang Jun, Niu Zhongqing, Shi Chun'e, et al. 2010. Microphysics of atmospheric aerosols during winter haze/fog events in Nanjing[J]. Environmental Science (in Chinese), 31(7):1425-1431. http://www.cnki.com.cn/Article/CJFDTOTAL-HJKZ201007005.htm [23] 尹志聪, 王会军, 郭文利. 2015.华北黄淮地区冬季雾和霾的时空气候变化特征[J].中国科学:地球科学, 45 (5):649-655. doi: 10.1007/s11430-015-5089-3Yin Zhicong, Wang Huijun, GuoWenli. 2015. Climatic change features of fog and haze in winter over North China and Huang-Huai area[J]. Science China (Earth Sciences), 58 (8):1370-1376, doi: 10.1007/s11430-015-5089-3. [24] 张人禾, 李强, 张若楠. 2014. 2013年1月中国东部持续性强雾霾天气产生的气象条件分析[J].中国科学:地球科学, 44 (1):27-36. doi: 10.1007/s11430-013-4774-3Zhang Renhe, Li Qiang, Zhang Ruonan. 2014. Meteorological conditions for the persistent severe fog and haze event over eastern China in January 2013[J]. Science China (Earth Sciences), 57 (1):26-35, doi: 10.1007/s11430-013-4774-3. [25] 中国气象局. 2007. QX/T 48-2007地面气象观测规范第4部分: 天气现象观测[S]. 北京: 中国标准出版社, 10pp.China Meteorological Administration. 2007. QX/T48-2007 Specifications for surface meteorological observation. Part 4:Observation of weather phenomenon (in Chinese)[S]. Beijing:China Standard Press, 10pp. [26] Zhou B B, Du J. 2010. Fog prediction from a multimodel mesoscale ensemble prediction system[J]. Wea. Forecasting, 25 (1):303-322, doi: 10.1175/2009WAF2222289.1 -