• 关键词：空气停滞  PM_2.5  京津冀地区  四川盆地  大气质量改善评估

• 基金项目：国家重点研发计划（No.2018YFC0214003）；国家自然科学基金重大研究计划（No.9164426）

• 欧阳正午
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 廖婷婷
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 陈科艺
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 罗浩林
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 陈智海
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 胡成媛
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 桂柯
• 中国气象科学研究院大气成分研究所, 北京 100081

• 吴佳奇
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 刘星辉
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 吴锴
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 摘要：对2014-2017年四川盆地和京津冀地区气象数据和污染物浓度数据进行综合评估，在原有全球空气停滞日判别标准基础上发展出本地化空气停滞指数阈值，并以提高两个区域空气质量优良天数为目的建立模型，计算各城市空气停滞发生时PM_2.5污染上限浓度参考值.本研究得出，四川盆地和京津冀地区本地化空气停滞日判别标准分别为地面风速 < 2.5 m·s^-1、边界层高度 < 500 m和地面风速 < 3 m·s^-1、边界层高度 < 300 m.四川盆地冬季空气停滞发生频率四周高，中心小，空气停滞对空气质量的影响西部高于东部；京津冀中部和南部空气停滞频率发生高，空气停滞对空气质量的影响呈现显著的南北差异.四川盆地以成都为中心城市群及京津冀中部和南部地区的高污染排放强度和高空气停滞频率导致重污染事件的频发.本文对我国两个冬季重污染高发的区域进行深入研究，更为客观、量化地评估4年来区域空气质量实际改善程度并初步建立空气质量目标管理模型，以期为区域空气质量达标管理提供可靠的科学依据.

• Abstract：The localized thresholds of air stagnation status for Sichuan Basin and Beijing-Tianjin-Hebei were developed based on the global air stagnation criterion, according to the comprehensive analysis of the data of meteorology and air quality in winter from 2014 to 2017, and we also established a simplified model to calculate the upper limited concentration of PM_2.5 for reference under the status of air stagnation in order to improve the percentage of good air quality days. The localized criteria for air stagnation for Sichuan Basin and Beijing-Tianjin-Hebei were given as surface wind speed < 2.5 m·s^-1, boundary layer height < 500 m, and surface wind speed < 3 m·s^-1, boundary layer height < 300 m, in this study, respectively. As for Sichuan Basin, the occurrence frequency of air stagnation was obviously higher in surrounding areas than that in center, and a stronger effects of air stagnation on air quality was observed in the western part of the basin. In the Beijing-Tianjin-Hebei region, the air stagnation events happened more frequently in the middle and southern area, and there was a significant difference in air stagnation effect between the southern part and the northern part of this region. The high emission intensity of air pollutants in city agglomeration surrounding Chengdu in west of Sichuan Basin and the middle and southern part of Beijing-Tianjin-Hebei region might lead to the high frequency of heavy pollutions in such areas. In this study, we conducted in-depth research on two regions with severe pollution in winter in China, and then objectively and quantitatively evaluated the actual improvement of regional air quality in the past four years. We also established a preliminary model to provide a more reliable and scientific basis for regional air quality management.

• Key words：air stagnation index  PM_2.5  Beijing-Tianjin-Shijiazhuang Region  Sichuan Basin  air quality improvement assessment

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