Preliminary Study of Vertical Distribution of Aerosols during Dry Haze Periods around Shanghai Based on CALIPSO

With the lidar data onboard CALIPSO satellite, the vertical distribution of aerosols when dry haze of different intensity occurred around Shanghai were revealed by analyzing optical parameters including attenuated backscatter coefficient, volume depolarization ratio and total attenuated colour ratio. The preliminary conclusion is that when dry haze occurs, the smoke and maritime aerosols are the major types of aerosols within 0–10 km in troposphere around Shanghai; the lower troposphere below 2 km is the area polluted most severely with the aerosols whose total attenuated backscatter coefficient is the strongest, mainly concentrating from 0.0015–0.0035 km−1.sr−1, volume depolarization ratio and colour ratio mainly range from 0–15% and 0.2–0.8, respectively; within 2–10 km in troposphere, total attenuated backscatter coefficient is smaller, mainly ranging from 0.0008–0.0025 km−1.sr−1 and depolarization ratio and colour ratio mainly concentrate from 0–20% and 0–0.6, respectively.