• 关键词：激光雷达  臭氧分布  近地层风场影响  珠海

• 基金项目：国家自然科学基金重点项目（No.41630422）；广东省重点领域研发计划项目（No.2020B1111360003）；广东省科技计划项目（No.2019B121201002）

• 许欣祺
• 中山大学大气科学学院，珠海 519082;广东省环珠江口气候环境与空气质量变化野外科学观测研究站，广州 510275;南方海洋科学与工程广东省实验室（珠海），珠海 519082

• 苗圣杰
• 中山大学大气科学学院，珠海 519082;广东省环珠江口气候环境与空气质量变化野外科学观测研究站，广州 510275;南方海洋科学与工程广东省实验室（珠海），珠海 519082

• 张亮
• 广东省环珠江口气候环境与空气质量变化野外科学观测研究站，广州 510275;广东省珠海生态环境监测站，珠海 519000

• 黎煜满
• 中山大学大气科学学院，珠海 519082;广东省环珠江口气候环境与空气质量变化野外科学观测研究站，广州 510275;南方海洋科学与工程广东省实验室（珠海），珠海 519082

• 范绍佳
• 中山大学大气科学学院，珠海 519082;广东省环珠江口气候环境与空气质量变化野外科学观测研究站，广州 510275;南方海洋科学与工程广东省实验室（珠海），珠海 519082

• 摘要：利用差分吸收臭氧激光雷达、多普勒风廓线激光雷达，研究了2019年11月在广东珠海出现的一次典型臭氧污染过程前后期的时空分布特征，以及水平风向风速及垂直风速对近地面与边界层上部臭氧浓度变化的影响.结果表明：2019年11月13日的臭氧污染以低风速条件下 臭氧局地生成为主；2019年11月14日的臭氧污染以夜间残留悬空臭氧向下输送叠加地面生成为主.入夜后若近地面水平风速较小，则不利于近地面臭氧清除，地面臭氧浓度下降缓慢.若夜间边界层内存在上升气流，则有利于悬空臭氧残留的维持；若日间边界层内出现下沉气流， 则会导致残留悬空臭氧沉降，进而与新生成的臭氧叠加，加剧地面臭氧污染.污染过程中，若水平风速上升，边界层上部臭氧浓度下降不如 低层明显；若水平风速下降，边界层上部臭氧浓度上升响应也较为迟缓.

• Abstract：This study examined the spatiotemporal distribution characteristics of ozone during a two-day ozone pollution episode， which occurred in mid-November 2019 in Zhuhai， Guangdong. The effects of horizontal wind speed and vertical wind speed on the variations of ozone concentration near the ground and in the upper boundary layer were analyzed using a differential absorption ozone lidar and a Doppler wind profile lidar. The results showed that the ozone pollution on 13 November 2019 was mainly caused by the local generation of ozone under low wind speed conditions； the ozone pollution on 14 November 2019 was affected by the downward transport of ozone from the nocturnal residual layer， in addition to the local generation of ozone. The low horizontal wind near the ground at night was not conducive to ozone removal， which limited the rapid decline of ozone concentration. The updrafts within the boundary layer at night could trigger a residual layer of ozone above the nocturnal boundary layer， whereas the downdrafts within the boundary layer during the daytime could transport the residual ozone downward to the ground-level. The superposition of the ozone transported from residual layer with the ozone generated near the surface aggravated the ozone pollution on the surface. During the ozone pollution episode， when the horizontal wind speed increased， the ozone concentration in the upper boundary layer decreased less significantly than that near the surface； when the horizontal wind speed dropped， the increase in ozone concentration in the upper boundary layer responded later than that near the surface.

• Key words：lidar  ozone pollution  influence of wind fields in the boundary layer  Zhuhai

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