State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; University of Chinese Academy of Sciences, Beijing 100049, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China.
Sci Total Environ. 2022 Feb 10;807(Pt 2):150306. doi: 10.1016/j.scitotenv.2021.150306. Epub 2021 Oct 9.
Aim at the effects of the coastal characteristic on ozone pollution in the Yangtze River Delta (YRD), a campaign was launched at the Ningbo, China in the summer of 2020, which mainly covered the monitoring of the vertical profiles of ozone (O) concentration, three-dimensional wind field, temperature and humidity profiles and parameters of boundary layer dynamic-thermodynamic structure. At the coastal research station, a sea-land breeze (SLB) circulation accompanied by a concurrent coastal low-level jets (CLLJ) structure was observed and identified during 11-12 May 2020. The sea breeze first formed at 10:00 LT on 11 May, turned to land breeze at night, and returned to sea breeze again at 10:00 LT the next morning, prevailing at altitudes of 0-0.5 km and 0-0.3 km respectively. Land breeze at night carries O from the inland to the sea forming high ozone levels over the sea, and the shift of the sea breeze during daytime further blew pollution back to the land. Additionally, the conversion of SLB contributed to the occurrence of CLLJ at the altitudes of ~0.3-0.7 km by 02:00 and 06:00 LT, of which the center of wind speed reached ~13 m s. The CLLJ-induced turbulent activity decoupled the residual layer (RL) and stable boundary layer, leading to a reduction of RL-O levels and an increase of ~50 μg m in surface-O concentration. The YRD's unique coastal characteristics make O pollution causes in coastal areas more complicated.
针对长江三角洲（YRD）沿海特征对臭氧污染的影响，2020 年夏季在中国宁波开展了一项活动，主要包括臭氧（O）浓度、三维风场、温度和湿度廓线以及边界层动力-热力学结构参数的垂直剖面监测。在沿海研究站，2020 年 5 月 11 日至 12 日观测到并识别了一种伴随沿海低空急流（CLLJ）结构的海陆风（SLB）环流。海风于 5 月 11 日 10:00LT 首次形成，夜间转为陆风，并于次日 10:00LT 再次转为海风，盛行高度分别为 0-0.5km 和 0-0.3km。夜间陆风将内陆的 O 带到海上，在海上形成高臭氧水平，白天海风的转变进一步将污染吹回陆地。此外，SLB 的转换在 02:00LT 和 06:00LT 左右促使 CLLJ 在~0.3-0.7km 高度发生，其中风速中心达到约 13m/s。CLLJ 诱发的湍活动使残余层（RL）和稳定边界层脱耦，导致 RL-O 水平降低，地面-O 浓度增加约 50μg/m。YRD 独特的沿海特征使得沿海地区的 O 污染原因更加复杂。
