Impact of a noon-time annular solar eclipse on the mixing layer height and vertical distribution of aerosols in the atmospheric boundary layer

摘要

Impact of the long duration noontime annular solar eclipse on 15 January 2010 on the vertical distribution of aerosols and mixing layer height (H _M) in a well-developed convective atmospheric boundary layer (ABL) has been investigated using continuous Lidar observations over a tropical coastal station, Thumba (8.5°N, 76.9°E). This study shows that H _M has decreased from its peak value of ~1800m at 12:00h to ~1000m following the annular phase of the eclipse (13:17h), while the corresponding decrease in the total aerosol abundance of ABL is ~29%. The post-eclipse increase of H _M is rapid compared to that during forenoon.