Mie Scattering Lidar Observation of Aerosol Vertical Profiles in Jakarta, Indonesia

Abstract

Vertical profiles of aerosols were observed in Jakarta, Indonesia, with a Mie scattering lidar network system consisting of three lidars located in the coastal, central, and inland areas. The structure of the planetary boundary layer was observed for one ' week during the September to October 1997 dry season. Radiosonde observation was performed in the same period in Jakarta. The diurnal variation of the boundary layer structure indicating the sea-land breeze circulation was clearly observed in this period. The mixed layer grew in the morning and reached a maximum of approximately 2.5 km in the afternoon. Clean air was brought in at heights up to 1.5 km at around 17:00 by a sea breeze, and a layer of aerosols was formed at the top of the boundary layer by the reverse flow. Aerosol layers were also observed above the boundary layer at altitudes of 2 to 5 km. A trajectory analysis shows a part of the aerosol plume originated from the forest fires in Kalimantan. The boundary layer structure in the wet season was observed in December 1997. The observed aerosol distribution was complicated this season, and it is inferred that the convection in the boundary layer sometimes reached 3 to 4 km in height.