Detectability assessment of a satellite sensor for lower tropospheric ozone responses to its precursors emission changes in East Asian summer
Detectability assessment of a satellite sensor for lower tropospheric ozone responses to its precursors emission changes in East Asian summer
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DOI：
10.1038/s41598-019-55759-7
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发表时间：
2019-12-23
影响因子：
4.6
通讯作者：
Liu, Xiong
中科院分区：
文献类型：
--
作者：
Kajino, Mizuo;Hayashida, Sachiko;Liu, Xiong
卫星传感器是大范围监测空气污染物时空变化的有力工具，但由于平流层和对流层上层 O-3 的存在，探测地表 O-3 一直具有挑战性。东亚是世界上污染最严重的地区之一，但氮氧化物和二氧化硫等人为排放量在2010年代开始减少。卫星很好地观察到了这一趋势，但这些排放趋势对 O-3 的时空影响尚未得到很好的了解。臭氧监测仪器 (OMI) 传感器的检索方法最近取得进展，能够检测对流层低层 O-3，其合法性已得到验证。在本研究中，我们利用区域化学模型，研究了 OMI 传感器检测对流层低层 O-3 对未来东亚夏季 O-3 前体气体排放减少的响应的统计显着性。排放量减少 10%、25%、50% 和 90% 导致区域和月平均白天模拟卫星可探测 O-3 (Delta O-3) 分别减少 4.4%、11%、23% 和 53%。在单侧 95% 置信区间下，重要区域的分数为 55%、84%、93% 和 96%。由于卫星传感器技术（例如TROPOMI）的最新进步，对流层光化学的研究将在不久的将来迅速发展。目前的研究证明了此类卫星分析对低对流层 O-3 及其由于前体气体排放控制而产生的扰动的有用性。
Satellite sensors are powerful tools to monitor the spatiotemporal variations of air pollutants in large scales, but it has been challenging to detect surface O-3 due to the presence of abundant stratospheric and upper tropospheric O-3. East Asia is one of the most polluted regions in the world, but anthropogenic emissions such as NOx and SO2 began to decrease in 2010s. This trend was well observed by satellites, but the spatiotemporal impacts of these emission trends on O-3 have not been well understood. Recent advancement in a retrieval method for the Ozone Monitoring Instrument (OMI) sensor enabled detection of lower tropospheric O-3 and its legitimacy has been validated. In this study, we investigated the statistical significance for the OMI sensor to detect the lower tropospheric O-3 responses to the future emission reduction of the O-3 precursor gases over East Asia in summer, by utilizing a regional chemistry model. The emission reduction of 10, 25, 50, and 90% resulted in 4.4, 11, 23, and 53% decrease of the areal and monthly mean daytime simulated satellite-detectable O-3 (Delta O-3), respectively. The fractions of significant areas are 55, 84, 93, and 96% at a one-sided 95% confidence interval. Because of the recent advancement of satellite sensor technologies (e.g., TROPOMI), study on tropospheric photochemistry will be rapidly advanced in the near future. The current study proved the usefulness of such satellite analyses on the lower tropospheric O-3 and its perturbations due to the precursor gas emission controls.