Characteristics of Coastal Low-Level Jets in the Boundary Layer of the Pearl River Estuary

It is well-known that coastal low-level jets (CLLJs) play an essential role in transporting heat, water vapor and pollutants. However, the CLLJ characteristics Pearl River Estuary have not been deeply revealed due to lack of long-term observations. Based on observations from a wind lidar, we analyze primary climatic CLLJs investigate their relationships with large-scale local-scale synoptic systems. The results show mainly appear during flood season, most occurrence May. season influenced by north–south pressure gradient driven western Pacific subtropical high terrestrial low-pressure exhibits distinct diurnal cycle two different peaks seasons. One peak appears at nighttime, non-flood other afternoon, season. In seasons, under influence cold air, inertial oscillations triggered land–sea thermal contrast lead onset nighttime Estuary. During strong near-surface contributes while topography (blocking passing) more conducive These findings reveal formation mechanisms over Estuary, thus providing basis for further understanding precipitation areas complex mountain ranges.