Seasonal Behavior of Aerosol Vertical Concentration in Dakar and Role Played by the Sea-Breeze

• 作者: Amadou Thierno Gaye éric Machu Gregory S. Jenkins Habib Senghor Luis Durán
• 来源期刊: 大气污染开放期刊(英文)
• 学科: 地球科学
• 关键词: AEROSOLS Dust Sea-Breeze Circulation
• 年，卷（期）: 2020,（1）
• 页码范围: 11-26
• 页数: 16页
• 分类号: P73

摘要

The Westward transport of mineral dust from the North Africa continent to Atlantic Ocean can produce poor air quality, low visibilities, and negatively impacting respiratory and cardiac health due to the optical and physical properties of aerosols. The dynamical impact of the sea-breeze on the dust vertical distribution in West Africa remains unknown. To investigate this issue, we have used in-situ measurements from lidar. We have focused on the attenuated backscatter of aerosols to study the effect of the local circulation on the vertical profile of mineral dust at land-sea transition. The results highlight a strong diurnal cycle of mineral dust associated with the nocturnal low-level jet (NLLJ). The jet is located between 500 m and 1000 m and crucially affected by the dynamic of the sea-breeze circulation.