Analysis of aerosol optical depth (AOD) retrieved from light detection and ranging (LIDAR) and sunphotometer measurements
Aerosols are small, micrometer-sized particles, whose optical effects coupled with their impact on cloud properties is a source of large uncertainty in climate models. Aerosols when inhaled are believed to have significant and detrimental effects on human health. Their presence also affects photosynthesis and agricultural production. Aerosol measurements are urgently required for the complete understanding and modeling their role in the climate system. This study builds on the analysis of Aerosol Optical depth (AOD) using Light Detection and Ranging (LIDAR) and sun photometer measurements then compare the AOD measured by the two systems. Passive (sunphotmetry) and active (lidar) measurements were employed to retrieve extensive optical signals (AOD and extinction coefficient respectively) and compared the optical coherency of these retrievals over a variety of aerosol in Pukou, Nanjing. Data for the year 2013 collected by both instruments were analyzed and compared at 532nm. The retrievals were performed using an existing deconvolution method applied to the sun photometry data and an algorithm based on Klett inversion method. Results of the lidar measurements showed that the AOD variations at different time intervals were mainly high at noon time. Differences and similarities in the AOD data trend were observed but generally, AOD value calculated from Lidar data are higher than that calculated from sunphotometer measurements.
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