Characterizing urban planetary boundary layer dynamics using 3-year Doppler wind lidar measurements in a western Yangtze River Delta city, China DOI Creative Commons
Tianwen Wei, Mengya Wang,

Kenan Wu

et al.

Atmospheric measurement techniques, Journal Year: 2025, Volume and Issue: 18(8), P. 1841 - 1857

Published: April 24, 2025

Abstract. The planetary boundary layer (PBL) dynamics play a critical role in shaping urban atmospheric processes by governing the exchange of energy, momentum, and mass within lower atmosphere. This study investigates PBL Hefei, city western Yangtze River Delta (YRD), using 3 years (June 2019 to June 2022) Doppler wind lidar data. Seasonal diurnal variations key parameters, including profiles, shear intensity, turbulent mixing, low-level jets (LLJs), mixing height (MLH), are analyzed. Results show that horizontal speeds accelerate more rapidly above km with predominant westerly winds (270°±15°) all seasons. vertical depth high-wind zone (>8 m s−1) during day is found be generally deeper than at night, particularly winter. In LLJs primarily form sunset dissipate noon, typically altitudes between 0.5 0.6 throughout year, except July. LLJ occurrences most frequent spring (31.7 %), followed summer (24.7 autumn (22.3 winter (21.3 %). Summer intensified, extending up 1.5 km. larger gradient below significantly enhances turbulence intensity near ground night. seasonal average MLH peaks 14:00 15:00 UTC+8, reaching approximately 1.2 summer. Cloud cover raises about 100 night but decreases it 200 afternoon peak. provides insights into lidar-based highlights implications for local standards concerning low-altitude economic activities.

Language: Английский

Characterizing urban planetary boundary layer dynamics using 3-year Doppler wind lidar measurements in a western Yangtze River Delta city, China DOI Creative Commons
Tianwen Wei, Mengya Wang,

Kenan Wu

et al.

Atmospheric measurement techniques, Journal Year: 2025, Volume and Issue: 18(8), P. 1841 - 1857

Published: April 24, 2025

Abstract. The planetary boundary layer (PBL) dynamics play a critical role in shaping urban atmospheric processes by governing the exchange of energy, momentum, and mass within lower atmosphere. This study investigates PBL Hefei, city western Yangtze River Delta (YRD), using 3 years (June 2019 to June 2022) Doppler wind lidar data. Seasonal diurnal variations key parameters, including profiles, shear intensity, turbulent mixing, low-level jets (LLJs), mixing height (MLH), are analyzed. Results show that horizontal speeds accelerate more rapidly above km with predominant westerly winds (270°±15°) all seasons. vertical depth high-wind zone (>8 m s−1) during day is found be generally deeper than at night, particularly winter. In LLJs primarily form sunset dissipate noon, typically altitudes between 0.5 0.6 throughout year, except July. LLJ occurrences most frequent spring (31.7 %), followed summer (24.7 autumn (22.3 winter (21.3 %). Summer intensified, extending up 1.5 km. larger gradient below significantly enhances turbulence intensity near ground night. seasonal average MLH peaks 14:00 15:00 UTC+8, reaching approximately 1.2 summer. Cloud cover raises about 100 night but decreases it 200 afternoon peak. provides insights into lidar-based highlights implications for local standards concerning low-altitude economic activities.

Language: Английский

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