| 基于天气分型的上甸子大气本底站臭氧污染气象条件 |
| 摘要点击 1995 全文点击 825 投稿时间：2020-03-30 修订日期：2020-06-01 |
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| 中文关键词 臭氧 Lamb-Jenkinson天气分型法 Mann-Whitney U检验 多元逐步回归 气象条件 |
| 英文关键词 ozone Lamb-Jenkinson weather classification Mann-Whitney U test multiple stepwise regression meteorological conditions |
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| 中文摘要 |
| 对流层臭氧作为典型二次污染物已成为北京春夏季首要污染物，气象因素是影响其浓度变化的主要因子之一.本研究基于2008~2017年大气成分和气象观测数据，利用Lamb-Jenkinson天气分型法结合Mann-Whitney U检验方法将影响北京地区天气型分为6类，其中SWW和C型上甸子臭氧浓度均值和极值分别最高，在4~9月出现频率最高，合计出现47.4%，并通过多元逐步回归方程确定两种型的主要贡献权重.SWW和C型下54%盛行西南风，新排放的污染物和二次老化气团经西南气流持续输送，850 hPa附近出现垂直速度零层，水平和垂直气象条件均有利于臭氧的输送、生成和聚积；AN和ESN型下64.7%盛行东北风或北风，气团来源清洁，1000 hPa以上盛行一致的下沉运动和气流辐散，新排放的污染物也能很快被稀释扩散，臭氧浓度处于较低值.以NW型2015年5月3日为例，虽然地面盛行西北气流，来源清洁，但大气通过垂直下沉运动将边界层以上的高浓度残留臭氧向近地面输送，导致某些天数中出现臭氧浓度高值. |
| 英文摘要 |
| As a typical secondary pollutant, tropospheric ozone has become the primary pollutant in Beijing in spring and summer, and meteorological factors are one of the main factors affecting the change in concentration. Using atmospheric composition and meteorological observation data from 2008 to 2017, the weather types in Beijing were divided into six categories by Lamb classification and Mann-Whitney U test. Among these, the mean and extreme values of ozone concentration of SWW and C types at Shangdianzi station were the highest, and the highest frequency was from April to September, with a total of 47.4%. The main contribution weights of the two types were determined by a multiple stepwise regression equation. The southwest wind prevailed in 54.0% of SWW and C types, and the newly discharged pollutants and secondary aging air masses were continuously transported by the southwest air flow. The vertical velocity zero layer appeared near 850 hPa. The horizontal and vertical meteorological conditions were conducive to the transport, accumulation, and secondary generation of ozone. The northeast wind prevailed in 64.7% of AN and ESN types, and the air masses source was clean. The same subsidence movement and air divergence prevailed above 1000 hPa. The discharged pollutants can also be diluted and diffused quickly, and the ozone concentration was at a low value. Taking the NW type on May 3, 2015 as an example, although the northwest air flow prevailed on the ground, with clean source, the residual high concentration of ozone above the boundary layer was transported to the near ground through the vertical subsidence of the atmosphere, resulting in the high concentration of ozone on some days. |
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