#TITLE_ALTERNATIVE#

• Main Author: Setyawati (NIM: 253 04 021), Wiwiek
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/6916
• Institution: Institut Teknologi Bandung

Abstract: <br /> <br /> <br /> <br /> <br /> Recently there is an increase in atmospheric aerosol concentration that resulted from anthropogenic activities. Bandung city is one of big cities in Indonesia that experiences increase in pollutant emission to ambient air because of transportation and industrial activities. Topographically, Bandung is a basinshaped city <br /> <br /> <br /> <br /> <br /> therefore dispersion and diffusion horizontally is barred by mountains, and vertically by stable layer especially during evening called nocturnal boundary layer (NBL). This will result in accumulation of pollutants in the atmosphere and their long term impacts can be very dangerous to humans lives. Tropospheric aerosol vertical distribution study is aimed to obtain trend of NBL heights and aerosol optical depths (AOD) and also to understand meteorology factor and local source strength influences to aerosol particles concentrations within NBL inBandung city. <br /> <br /> <br /> <br /> <br /> Secondary data used in calculation were obtained by Mie lidar with dual polarization measurements with 532 nm wavelength. Observations were carried out during clear and cloudless nights from 19972000. Study was focused on <br /> <br /> <br /> <br /> <br /> aerosol vertical distribution within altitude range of 0.65 km above ground level. <br /> <br /> <br /> <br /> <br /> Parallel and perpendicular signals measured were then calculated to obtain backscattering and depolarization ratios. Fernald et. al. and Russell et. al. methods <br /> <br /> <br /> <br /> <br /> were used to calculate backscattering ratio and further calculation gave AOD. Depolarization ratio was used to differ between solid and liquid phases of aerosol <br /> <br /> <br /> <br /> <br /> particles. Furthermore chemistry composition as a function of relative humidity and temperature of majority inorganic salts assuming to exist in the atmosphere <br /> <br /> <br /> <br /> <br /> during measurements could be assessed. It was found that monthly average of NBL heights and AOD were varied between <br /> <br /> <br /> <br /> <br /> 9001673 m and 0.0010.104 respectively. Aerosol shape and phase distribution within NBL showed predominance of spherical particles (liquid) almost in every month. Furthermore it was found that there was increasing trend of NBL heights about 9.5 m every month. In the other hand decreasing trend of AOD values about 0.0002 every month during period January 1997December 2000 was observed. <br /> <br /> <br /> <br /> <br /> Weak negative correlation was found between AOD and surface relative humidity, and on the contrary weak positive correlation was found between AOD and ground level SPM concentration. <br />