| The aerosols affect the radiation budget of earth-atmosphere system through absorption and scattering of solar radiation, which is known as direct effect. On the other hand, they act as cloud condensation nuclei to affect the formation of cloud, which is known as indirect effect. MPL (Micro Pulse Lidar) can be used to real-time monitor troposphere aerosols and the mixed layer height. This paper retrieved aerosol vertical profiles and the mixed layer height over Shouxian area based on the data measured by MPL and SONDE on cloud-free days from2008/05/24to2008/12/28, the following main conclusions were concluded:1. Retrieved the aerosol profiles using Fernald method, the result showed that:(1) there are three typical kinds of vertical structures of aerosol extinction;(2) after analyzed the monthly-averaged aerosol profiles measured in Oct-Dec,2008, the mean value of aerosol extinction was in Oct and the smallest value was in Dec.(3) the linear depolarization ratio and the Time-altitude cross-section of the Normalized relative backscatter can be used to analyzed aerosol and boundary layer’s vertical structure.2. Comparisons were made between MLH retrieved from MPL retrieval methods and MLH determined by the sounding data measured by SONDE. The results showed that MLH retrieved form lidar data using the gradient method were highly correlated with MLH measured by SONDE (R=0.976), and the absolute error of the gradient method is the smallest among them, so it is the most suitable method for this area.3. The diurnal cycle of MLH on sunny days were retrieved by gradient method, the effect of meteorological conditions were also studied. The results showed that the growth rate of MLH agrees well with the hourly increase in the surface temperature of the previous hour; Wind speed and wind direction were found to be another important factor controlling the MLH; The development of MLH exhibits temporal behavior similar to that of the aerosol optical thickness, but with a time delay. |
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