| 2016冬季京津冀一次持续重度霾天气过程分析 |
| 摘要点击 6533 全文点击 775 投稿时间：2020-12-05 修订日期：2021-01-17 |
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| 中文关键词 霾 环流背景 气象要素 激光雷达 极端性 |
| 英文关键词 haze circulation background meteorological elements laser radar extremity |
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| 中文摘要 |
| 2016年12月16~21日我国京津冀地区发生了一次持续重度霾天气过程.为了进一步加深对霾的认识和提高对霾的分析预报能力，利用多种资料，对此次重度霾天气过程的环流背景和气象要素等进行了综合性分析.结果表明，此次过程持续时间长，污染强度大，影响范围广，能见度低，以外来输送为主，气溶胶主要分布在600 m以下高度，有一定的极端异常性，静稳天气指数与空气质量指数有较好的对应关系；京津冀地区高空受高压脊前的纬向环流控制，维持偏西气流，冷空气活动弱，以下沉气流为主，水汽含量较低，高空云量较少，低空有暖脊北伸，地面位于高压东南部，受均压场控制，气压梯度较小，受偏南风影响，污染物易于堆积；地面静小风，相对湿度较高，混合层高度较低，不利于污染物的水平和垂直扩散. |
| 英文摘要 |
| From December 16 to 21, 2016, continuous heavy haze occurred in the Beijing-Tianjin-Hebei region of China. To further understand the development mechanism of haze and improve the forecasting of haze events, a variety of data, background circulation, and the meteorological elements of this severe haze process were comprehensively analyzed. The results show that the process lasted for a long time, pollution intensity was high, influence area was wide, visibility was low, and external transport was the main cause. Aerosols were mainly distributed at a height of 600 m, and there was a certain extreme anomaly. The static weather index and air quality index showed a strong correlation. The air in the Beijing-Tianjin-Hebei region is controlled by zonal circulation in front of a high-pressure ridge, which maintains the westerly airflow. Cold-air activity is weak, and downflow is dominant. The water vapor content is low, the cloud cover is limited at high altitudes, and a warm ridge extends northwards at low altitudes. Limited static wind on the ground, high relative humidity, and low mixing-layer height are not conducive to the horizontal and vertical diffusion of pollutants. |
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