Abstract：
Long Island Sound (LIS) frequently experiences ozone (O3) exceedance events that surpass national ambient air quality standards (NAAQS) due to complex driving factors. The underlying mechanisms governing summertime O3 pollution are investigated through collaborative observations from lidar remote sensing and ground samplers during the 2018 LIS Tropospheric O3 Study (LISTOS). Regional transport and local chemical reactions are identified as the two key driving factors behind the observed O3 episodes in LIS. An enhanced laminar structure is observed in the O3 vertical structure in the atmospheric boundary layer (i.e., 0-2 km layer) for the case dominated by regional transport. An O3 formation regime shift is found in ozone-precursor sensitivity (OPS) for the O3 exceedance event dominated by regional transport with NOx-enriched air mass transport from the New York City (NYC) urban area to LIS. Furthermore, the Integrated Process Rate (IPR) analysis demonstrates that transport from the NYC urban area contributed 40% and 27.1% of surface O3 enhancement to the cases dominated by regional transport and local production, respectively. This study provides scientific evidence to uncovers two key processes that govern summertime O3 pollution over LIS and can help to improve emission control strategies to meet the attainment standards for ambient O3 levels over LIS and other similar coastal areas.
摘要：
由于复杂的驱动因素，长岛之声（LIS）经常经历臭氧（O3）超标事件，这些事件超过了国家环境空气质量标准（NAAQS）。在2018年LIS对流层O3研究（LISTOS）期间，通过激光雷达遥感和地面采样器的协作观测，研究了夏季O3污染的基本机制。区域运输和局部化学反应被确定为LIS中观察到的O3事件背后的两个关键驱动因素。在大气边界层的O3垂直结构中观察到增强的层状结构（即，0-2km层），适用于以区域运输为主的情况。在O3超标事件的臭氧前体敏感性（OPS）中发现了O3形成方式的转变，该事件由区域运输和从纽约市（NYC）市区到LIS的富含NOx的空气质量运输主导。此外，综合工艺速率（IPR）分析表明，从纽约市市区的运输贡献了40％和27.1％的地面O3增强，以区域运输和当地生产为主的情况下，分别。这项研究提供了科学证据，以揭示控制LIS上夏季O3污染的两个关键过程，并有助于改善排放控制策略，以达到LIS和其他类似沿海地区环境O3水平的达标标准。
