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Local aerosol concentrations and optical characteristics influenced by the Indonesian forest fire

Indonesian forest fire took place on Kalimantan and Sumatera islands in 1997 and continuously influenced the atmospheric conditions of South-East Asia nearly throughout the last half of that year. The color composed images of visible, near IR and IR channels from NOAA AVHRR daily data, arbitrarily assigned to red, green and blue respectively, were synthesized for distinguishing the smoke area. The data of three periods, the beginning, mid, and ending parts of the fire, were collected and analyzed in order to show the variation of atmosphere with the development of fire. A retrieval algorithm was established by use of Mie theory calculation and the radiative transfer code (MODTRAN 3). Local aerosol concentrations and properties over ocean parts between the two islands were derived. It is found that the aerosol optical thickness increased in accordance with the exacerbation of the fires. The changes of Ångstrom exponents show that smaller particle amounts were raised by the effects of burning.