Land-sea recirculation such as bay and sea-breezes are important local circulations that facilitate pollution events. Measurements over a marine site in the Chesapeake Bay revealed the evolution of two bay-breeze events and associated ozone vertical structure. The horizontal and vertical structure of the bay-breeze was detailed using scanning Doppler wind lidar measurements and a ground-based ozone lidar was used to characterize the vertical distribution of ozone. The two bay-breeze events on 29–30 June 2018 observed during the Ozone Water-Land Environmental Transition Study Phase 2 (OWLETS-2) campaign showed distinct differences in the horizontal and vertical evolution of wind as well as the accompanying vertical structure of ozone. The analysis of the wind circulation showed that the intensity of the offshore flow plays an important role in the initiation time, development, and strength of the bay-breeze on both days. Results showed increased surface ozone concentrations during times of relatively low or decreasing bay-breeze height and weak upwards vertical motion. Upwards vertical motions were significantly enhanced on 30 June 2018 and presented with a decrease in surface ozone concentrations, yet enhanced ozone values were lofted above the surface near the lofted offshore flow. This study shows that both the vertical structure and evolution of pollutants can be impacted by the bay-breeze events through dilution and transport.

海湾和海风等陆海再循环是促进污染事件的重要局部循环。对切​​萨皮克湾海洋站点的测量揭示了两次海湾微风事件和相关臭氧垂直结构的演变。海湾微风的水平和垂直结构使用扫描多普勒风激光雷达测量进行了详细说明，并使用了地面臭氧激光雷达来表征臭氧的垂直分布。2018 年 6 月 29 日至 30 日，在臭氧水陆环境转变研究第 2 阶段 (OWLETS-2) 活动期间观察到的两次海湾微风事件显示出风的水平和垂直演变以及伴随的臭氧垂直结构的明显差异. 风环流分析表明，离岸气流的强度对这两天湾微风的发生时间、发展和强度起着重要作用。结果表明，在月桂微风高度相对较低或下降以及向上垂直运动较弱的时期，地表臭氧浓度会增加。2018 年 6 月 30 日，向上的垂直运动显着增强，表面臭氧浓度下降，但增强的臭氧值在靠近放样离岸流的地表上方放样。这项研究表明，海湾微风事件可以通过稀释和迁移来影响污染物的垂直结构和演变。结果表明，在月桂微风高度相对较低或下降以及向上垂直运动较弱的时期，地表臭氧浓度会增加。2018 年 6 月 30 日，向上的垂直运动显着增强，表面臭氧浓度下降，但增强的臭氧值在靠近放样离岸流的地表上方放样。这项研究表明，海湾微风事件可以通过稀释和迁移来影响污染物的垂直结构和演变。结果显示，在月桂微风高度相对较低或下降以及向上垂直运动较弱的时期，地表臭氧浓度增加。2018 年 6 月 30 日，向上的垂直运动显着增强，表面臭氧浓度下降，但增强的臭氧值在靠近放样离岸流的地表上方放样。这项研究表明，海湾微风事件可以通过稀释和迁移来影响污染物的垂直结构和演变。