基于高分辨率FTIR观测的对流层O3污染时空分布特征及污染机理探索

As a marker of photochemical smog, tropospheric O3 indicates regional air pollution level. Besides, as a strong oxidizer, it also plays a key role in many chemical process in the troposphere. In recent years, O3 pollution identification and its release control has become an important frontier of the atmospheric pollution control. However, O3 pollution mechanism in photochemical smog is rather complex and highly related to its precursors' pollution level and meteorological conditions, resulting in typical regional characteristics. The state of art researches are mainly based on the active point observation data. The coverage is small and the results are easily influenced by instrument-to-instrument measurement biases. In this proposal, we attempt to derive the evolution mechanism and the temporal/spatial distribution of tropospheric O3 pollution by using high resolution Fourier transform infrared spectroscopy (FTIR). Time series of tropospheric O3 and its precursors as NOX (NO2, NO) and VOCs (HCHO, C2H2, C2H6, etc.) are all retrieved from one ground-based high resolution FTIR system. The meteorological parameters such as temperature, humidity, pressure, radiance, etc., are also involved in this study. This study shows large spatial coverage and is not affected by instrument-to-instrument measurement biases, resulting in stronger regional representative. This study facilitates identifying the distribution, characteristics and the evolution mechanisms of tropospheric O3 pollution, which can provide a valuable reference for solving O3 pollution in China.

对流层O3是光化学烟雾的标识物，是区域大气污染水平的基准，而且作为一种强氧化剂，在对流层许多化学过程中起关键作用。臭氧污染机理和防治已成为近年来大气污染防治的重要前沿。然而，光化学烟雾O3的污染机理十分复杂，与前体物污染水平和气象要素密切相关，具有典型的区域性特征。目前开展的相关研究主要基于主动点式观测数据，覆盖范围小，且研究结果受不同仪器测量偏差的影响，具有一定偶然性。拟基于高分辨率傅里叶变换(FTIR)直射太阳光谱同时反演出对流层O3及主要前体物NOX(NO2、NO)和VOCs(HCHO、C2H2、C2H6等)空间分布，并结合温、湿、压、光照等气象参数，开展对流层O3污染时空分布特征及主要气象要素和前体物对O3污染的影响研究。覆盖范围大且不受仪器之间测量偏差的影响，更具区域代表性。既可掌握区域光化学烟雾O3污染水平、时空分布特征，又有利于研究O3污染机理，为我国O3污染的防治提供重要参考。

对流层O3是光化学烟雾的标识物，是区域大气污染水平的基准，而且作为一种强氧化剂，在对流层许多化学过程中起关键作用。臭氧污染机理和防治已成为近年来大气污染防治的重要前沿。然而，光化学烟雾O3的污染机理十分复杂，与前体物污染水平和气象要素密切相关，具有典型的区域性特征。目前开展的相关研究主要基于主动点式观测数据，覆盖范围小，且研究结果受不同仪器测量偏差的影响，具有一定偶然性。本项目基于高分辨率傅里叶变换(FTIR)直射太阳光谱同时反演出了对流层O3及主要前体物NOX(NO2、NO)和VOCs(HCHO、C2H2、C2H6等)空间分布，并结合温、湿、压、光照等气象参数，开展了对流层O3污染时空分布特征及主要气象要素和前体物对O3污染的影响研究。覆盖范围大且不受仪器之间测量偏差的影响，更具区域代表性。研究结果既可掌握区域光化学烟雾O3污染水平、时空分布特征，又有利于研究O3污染机理，为我国O3污染的防治提供了重要参考。