Abstract: Cloud-aerosol lidar with orthogonal polarization(CALIOP) can emit  532 nm and 1064 nm laser pulses 
which is mainly used for the detection of clouds and aerosols in the atmosphere. The 532 nm laser
pulse can be used to get backscatter signal below the sea surface due to a good penetrability to
the ocean surface. Based on the CALIOP data, the directly extracted signal and the corrected transient
response signal of subsurface are studied. Firstly, the subsurface backscatters are calculated.
Then the marine particulate backscattering coefficients are retrieved from two different methods,
and compared to particulate backscattering coefficients from moderate-resolution imaging
spectroradiometer(MODIS) products. The mean of difference value of particulate backscattering
coefficients are 0.0035 and 0.0027,and the standard deviation are 0.4004 and 0.0042 respectively,
which indicates that particulate backscattering coefficients derived by using transient response
correction method is  closer to MODIS products.