基于OMI的船舶排放控制区SO2减排效益分析

船舶尾气排放是造成海洋污染的主要排放源之一。自 2016 年设立船舶大气污染物排放控制区以来，船舶硫氧化物、氮氧化物和颗粒物排放显著减少。为了对环渤海湾水域排放控制区的大气 SO2 减排效果进行分析，选取了 Aura 卫星搭载的OMI 传感器痕量数据产品 OMSO2 进行大气 SO2数据反演。选择 2017 年各月的 OMI Level-2 痕量数据，对大气边界层 SO2 柱量值进行提取，采用空间分析方法，对其时空变化进行分析，以监测排放控制区的减排效果。结果表明：春季和冬季 SO2 量值明显高于其他季节，年际变化比较明显，自 2016 年以来，SO2 柱总量峰值逐年降低，并且高值区域逐渐减少，证明排放控制区的设立对大气质量保护具有积极作用。

Study on the benefits of SO2 emission reduction in emission control area based on OMI data

Ship exhaust is one of the main sources of marine pollution. Since the establishment of the air pollutant emission control zone for ships in 2016, the emissions of sulfur oxides, nitrogen oxides and particulate matter from ships have been significantly reduced. In order to analyze the emission reduction effect of atmospheric SO2 in the the Bohai Bay, the data-tracing product of OMI sensor carried by Aura satellite, was selected for atmospheric SO2 data inversion. The OMI level-2 data of each month in 2017 were selected to extract the SO2 column volume value in the atmospheric boundary layer, and the spatial analysis method was used to analyze its temporal and spatial changes to monitor the emission reduction effect in the emission control area. Results show that the value of SO2in spring and winter is significantly higher than that in other seasons,and the annual change is relatively obvious. Since 2016, the peak value of total SO2 column has decreased year by year, and the high value area has gradually reduced, proving that the establishment of emission control area has a positive effect on air quality assurance.