Twenty-Five Years of Lower Tropospheric Ozone Observations in Tropical East Asia: The Influence of Emissions and Weather Patterns
Twenty-Five Years of Lower Tropospheric Ozone Observations in Tropical East Asia: The Influence of Emissions and Weather Patterns
复制标题
DOI：
10.1029/2019gl084459
复制
发表时间：
2019-10-17
影响因子：
5.2
通讯作者：
Brasseur, Guy P.
中科院分区：
文献类型：
--
作者：
Wang, Tao;Dai, Jianing;Brasseur, Guy P.
对流层臭氧影响地球的辐射平衡、氧化能力和空气质量，但东亚的长期臭氧趋势及其驱动因素仍然知之甚少。我们在此展示 1994 年至 2018 年在中国南部沿海获得的臭氧测量结果。测量地点大部分时间拦截中国的流出量，并在夏季拦截热带海洋空气的流入量。我们发现臭氧水平总体上升（0.35 ppbv/年），上升主要发生在 25 年期间的前半段，但近年来中国的流出量似乎趋于平稳。海洋空气中的臭氧含量大幅增加（大约每十年增加 20%）。模型模拟显示，最近的天气状况减少了海洋臭氧，抵消了东南亚排放量不断增长的影响。我们的研究结果填补了亚洲长期臭氧趋势的空白，并强调了天气和排放在驱动臭氧变化方面的复杂相互作用。
Tropospheric ozone affects the Earth's radiative balance, oxidative capacity, and air quality, yet the long-term ozone trend in East Asia and its driver(s) remain poorly understood. Here we present ozone measurements obtained during 1994-2018 on China's southern coast. The measurement location intercepts China's outflow most of the time and the inflow of tropical maritime air during summer. We found an overall increase in the ozone level (0.35 ppbv/year), and the increase occurred mainly during the first half of the 25-year period but appeared to level off in recent years in Chinese outflow. Large ozone increase (similar to 20% per decade) was found in the maritime air. Model simulations show that recent weather conditions have reduced maritime ozone, counteracting the impact of the growing Southeast Asia's emissions. Our results fill the gap in the long-term ozone trend in Asia and highlight the complex interaction of weather and emissions in driving the ozone change.