Multi Channel Lidar Observation of Aerosol Backscatter Ration at Kosan, Jeju, Korea during the Spring of 2001

Details Multi Channel Lidar Observation of Aerosol Backscatter Ration at Kosan, Jeju, Korea during the Spring of 2001 Multi Channel Lidar Observation of Aerosol Backscatter Ration at Kosan, Jeju, Korea during the Spring of 2001

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.a41b0073h&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #A41B-0073

Physics

0305 Aerosols And Particles (0345, 4801)

Scientific paper

Vertical profiles of atmospheric aerosol backscattering and the depolarization ratio(particle nonsphericity) were measured with multi channel lidar at Kosan(33.17ºN, 126.10ºE, 50m) from 11 March to 4 May, 2001, ACE-Asia intensive measurement period to investigate the characteristic of aerosol optical properties with altitude during yellow sand event. Our lidar system used a Nd:YAG laser whose wavelength are 355nm, 532nm, and 1064nm. Pulse duration of laser do not exceed 10ns at 1064nm, repetition rate is 20Hz, and detection range is below 60km. Addtionally, the detector is PMTs which counts the number of photons. Lidar consists of three telescopes and receives data of aerosols at the eight channels. Two channels are used not only to measure aerosols but also to analyze boundary layer. The six channels which detect aerosols are produced by polarizing 532nm laser and 1064nm laser vertically and horizontally respectively. During April 13, yellow sand layers existed at 6km and 4km, respectively. The upper layer had a scattering ratio of 5.0 which the lower layer had a scattering ratio of 6.7. Much more lower layers appeared at about 2km to be mixed with background aerosol and scattering ratio of 1.4. At April 23, yellow sand layers existed at 4-5km. and the maximum scattering ratio of 54.1 was recorded. Also, at April 24, yellow sand layers existed at 5.5km and 4km. The upper layer had a scattering ratio of 55.1, and the lower layer had a scattering of 17.6. At April 26, yellow sand layers separated low and high altitude between 3-5 km and 10-11 km respectively. At the lower altitude, yellow sand layers existed at 3-5km with maximum scattering ratio of 4.7. However, at high altitude, yellow sand layers existed at 10-11km, and the maximum scattering ratio of 9.0 was observed. Keyword : ACE-Asia, Multi Channel Lidar, Yellow Sand, Scattrting ratio

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