DISTRIBUTION OF AEROSOL EXTINCTION IN THE LOWER TROPOSPHERE BY MICRO-PULSE LIDAR OBSERVATION |
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| Authors: | WU Yonghua HU Huanling ZHOU Jun Atmospheric Optics Lab Anhui Institute of Optics and Fine Mechanics Hefei Nobuo TAKEUCHI Center for Environmental Remote Sensing Chiba University Chiba -JapanAkihiro UCHIYAMA Shoji ASANO Meteorological Research Institute Ibaraki TsukubaJapan |
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| Institution: | WU Yonghua HU Huanling ZHOU Jun Atmospheric Optics Lab,Anhui Institute of Optics and Fine Mechanics,Hefei 230031Nobuo TAKEUCHI Center for Environmental Remote Sensing,Chiba University,Chiba 263-8522.JapanAkihiro UCHIYAMA Shoji ASANO Meteorological Research Institute,Ibaraki 305,Tsukuba.Japan |
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| Abstract: | The profiles of aerosol extinction coefficients are investigated by micro-pulse lidar(MPL) combined with the meteorological data in the lower troposphere at Meteorological Research Institute(MRI).Japan.Larger extinction values of aerosol are demonstrated in the nocturnal stable air layer with larger Richardson number,and light wind velocities are favorable for aerosol concentrating in the planetary boundary layer(PBL).But aerosol extinction coefficients show larger values over the altitudes of 2.0 to 5.0km where correspond to higher relative humidity (RH).The tops of PBL identified by the aerosol extinction profiles almost agree with ones by radiosonde data.The diurnal variations of aerosol extinction profiles are clearly displayed, intensive aerosol layers usually are formed over the period of mid-morning to 1400 Loeal Time (LT).then elapse in the cloudless late afternoon and nighttime.Thermal eonvection or turbulent transport from the surfaee probably dominates these temporal and spatial changes of aerosol distribution. |
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| Keywords: | aerosol micro-puse lidar(MPL) radiosonde lower troposphere |
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