Low Altitude Fog-Haze Aerosol Measurements By Lidar In North Suburb Of Nanjing

In this paper two lidars namely Raman-Rayleigh-Mie Lidar(RRML) and Micro Pulse Lidar(MPL) located in NUIST are used to measure the low altitude fog-haze aerosol in north suburb of Nanjing. For RRML, to calculate the extinction coefficient profile by Klett inversion method and verify its reasonable by comparing it with the Nepelometer data.For Micro Pulse Lidar, to calculate aerosol extinction coefficients and aerosol optical thickness by Fernald inversion method, and the results have an effective correction with the sun-photometer data so it’s accurate and available.Mie channel data of Raman-Rayleigh-Mie lidar are used to observe low altitude fog-haze aerosol in north suburb of Nanjing and summarize their typical waveform characteristics square of the range corrected signal. Observe the continuous process of distribution of fog, haze, boundary layer aerosol on December2,2009, December24,2009, January10,2011and compare them, the results show that the height of the observed distribution of low fog was about300meters and its range corrected signal is relatively small because its forward scattering and the surrounding strong backscatter is small. The same height as the low-altitude haze appeared, roughly the height of less than500meters, but strength of its range corrected signal is greater than fog. The height of the atmospheric boundary layer observed aerosol distribution is1km, and its height is more than fog and haze, showing a layered distribution.AOD results of Micro Pulse Lidar are used to compare with standard aerosol products MOD04, and it shows that the correlation coefficient is0.6. Its trend is consistent with the satellite lidar inversion results so it has relatively high reference value. By combining the results of the inversion of TM AOD, the spatial distribution of the aerosol can be studied and lack of space exploration of lidar can be made up.