Applications Of CALIOP Data In Aerosol And Sea Surface Wind Speed Relationship Research And Spaceborne Coherent Wind Lidar Simulation

Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) onboard theCloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO), provideglobal measurements of aerosols and clouds with high-precision, high-resolutionthree-dimensional data. This paper aims on using CALIOP3D observation of aerosol datato study the spatial distribution of global aerosol, explore the relationship between aerosoland sea surface wind speed over the global oceans, including the relationship of aerosoloptical thickness and aerosol layer height with sea surface wind speed.For the first time,apply the real observation of aerosol backscatter profile data to the performance simula-tion of spaceborne coherent Doppler wind lidar.CALIOP L2V3.01of aerosol and cloud layer products from January2008to De-cember2010and aerosol profile product of year2008are used, only nighttime data areapplied to the statistical analysis. By statistical method, we get the global spatial distribu-tion of aerosol, including the probability of aerosol appears, the stratification of aerosollayers, the distribution of aerosol layer top altitude, aerosol optical depth, aerosol back-scatter coefficient, and aerosol scale height. The distributions of each aerosol subtypeover the ocean also obtained.The relation research between aerosol and sea surface wind speed is explored usingremotely sensed data CALIOP and the Advanced Microwave Scanning Radiometer(AMSR-E) on board the AQUA satellite. The relationship between532nm aerosol opticaldepth and sea surface wind speed is studied over the global ocean, and results show thatthe relationship does not change much with year and seasons, less affected by aerosol type,and in close relationship with pure marine aerosol’s result. The relationship between opt- ical depth and wind speed is mainly affected by the latitude distribution of wind speed.Study the pure marine aerosol in different latitude areas, regardless of the wind speed be-low4m/s, optical depth and sea surface wind speed show linear relationship, with the in-crease of latitude, linear slope is reduced, the slope range of the four latitude areas is0.005-0.005. The relationship between pure marine aerosol layer top altitude and sea sur-face wind speed is also affected by the wind speed distribution with latitude. A linear re-lationship shows lower slope with the increase of latitude. Because of the less data vo-lume, no obvious relationship is found between aerosol scale height and sea surface windspeed.CALIOP aerosol profile data of year2008are used to provide by the3D distributionof aerosol backscatter coefficient. According to the theory of coherent Doppler lidar he-terodyne detection, model of wind performance evaluation parameters, and the backscat-ter coefficient wavelength convert formula, the real observation of aerosol instead ofaerosol model is computer simulated in clear-air conditions for a space-based2.1μm co-herent Doppler wind lidar measurement at single laser shot. The simulation results showthat with the lidar parameters adopted, coherent wind lidar is available to achieve velocitymeasurements with an RMS error smaller than1m/s and a good estimate fraction betterthan90%in the lowest troposphere about2km worldwide, and the altitude can reachhigher up to6km between latitude20°S and60°N. The simulation results demonstratedthat a global wind profiling of the lower troposphere from space is feasible using a cohe-rent Doppler wind lidar with achievable system design, appropriate performance settingand parameter selection.