Photolysis of iodine and iodine compound in the presence of O3 has been proposed as a mechanism leading to intense iodine oxide particles(IOPs) formation, which has a profound influence on global climate change and atmospheric environment. It is believed that the formation of IOPs is involved with the production and oxidation of a series of iodine oxides (IxOy). However, the details of IOPs formation are not yet resolved, and there are still important gaps between modeling and field research, or even between different modeling work, which hinders precise evaluation of IOPs’ impaction atmospheric processes, climate and human health. The main progress research on the formation of iodine oxide particles has been described and the major challenges have been discussed.

CALIOP receiver system transient response of 532 nm channel is not ideal. It is analyzed by using Version 3.01 (V3), Version 4.0 (V4) Level 1 (L1) profile data and Level 2 (L2) atmospheric aerosol and cloud layer data. The transient responses are compared in different time and location, different clear atmospheric conditions, different nadir and different version of data. In addition, the influence of surface signal strength on the transient response is explored. Results show that the version change and the nadir change have no effect on the transient response; the clearest air condition is necessary to choose; desert (tIGBP=16) is the better object for the analysis of transient response; the signal strength of surface attenuated backscatter has influence on the transient response. These strengths less than 0.40 km-1sr-1are weak signal, needed to be removed.

The ozone pollution near surface is becoming a severe problem recently, which can damage human health, plants and the ecological environment seriously. The “triple-peak” model is discovered in the experiment of the diurnal variation of ozone concentration in Hefei, Anhui, China during 2003 and 2004. Meanwhile, the “double-peak” model is showed in Xingtai, Hebei, China during the experiment from May to June in 2016. The site of ozone observation in Hefei is surrounded by trees and reservoir, so the chemical reaction caused by the volatile organic compounds produced by the plants cannot be ignored. Moreover, the breeze downdraft between land and water is also a main cause for the formation of “peak in morning and evening” in Hefei. Xingtai belongs to the heavy pollution area, the sources of ozone should be considered more comprehensively with the pollution sources, ozone precursor composition, meteorological actors, the geographical location, and so on. The correlation analysis shows that the strong sun radiation, high temperature and low relative humidity promote ozone formation.

Low-level wind shear can affect aircraft during taking-off and landing phases and the structure of wind turbines in disastrous ways. The principle and parameters of coherent Doppler lidar(CDL) were explained briefly and the method of retrieving wind profiles from line of sight (LOS) wind speed was introduced in detail. The data analysis is based on CDL configured at Beijing Capital International Airport (BCIA) in spring of 2015. Wind profiles time series and wind speed gradient were illustrated to identify the low-level wind shear. The results show that CDL is an effective tool to capture the low-level wind shear events.

PM2.5 is the primary pollutant affecting the air quality of Henan Province, China. In addition, dust haze pollution is serious in autumn and winter. In order to master the pollution feature of PM2.5, the spatio-temporal distribution characteristics of PM2.5 in 17 cities of Henan Province were studied by using statistical methods and ARCGIS. The results show that 57.16% of the entire days in 2015 met Chinese national standard on daily average concentration of PM2.5 in those 17 cities. However, from the seasonal perspective, 73.68% of the days in winter, 44.37% of the days in spring, 34.53% of the days in autumn and 20.08% of the days in summer failed to meet the standard. The analysis results show that the average concentration of PM2.5 at weekends was 8.04% higher than that of working days. This reveals an interesting phenomenon named inverse weekend effect when the extremely polluted days due to heavy haze mainly controlled by meteorological conditions have not been taken into consideration. There was a high relevance between the PM2.5 concentration and SO2 concentration. It suggests that the main air pollutants are coarse-particles which are mainly from coal-burning. There is higher correlation in the range of PM2.5 and SO2, it show that the coal-burning has a major influence on Henan Province. PM2.5 show a positive correlation with PM10 and NO2. It illustrates that the pollution is mainly caused by coal burning and motor vehicle exhaust. Owing to the influence of the temperature and sunlight changes, the correlativity of PM2.5 concentrations and O3 concentrations presents remarkable difference in different seasons. The correlation coefficient is 0.003 for spring, 0.496 (p=0.01) for summer, -0.353 (p=0.05) for autumn and -0.315 (p=0.05) for winter, respectively.

Based on polarization characteristics of non-spherical particles, a short-range lidar system for real-time standoff detection of bioaerosols was developed. The system includes two laser sources and depolarization components. Linear polarization purity of the laser beam is 1/500. The polarization and elastic scattering signals are collected by a Cassegrainian telescope. In a semi-closed bioaerosol chamber, 10 kinds of bioaerosol were mixed and interrogated by 355, 532, 1064 nm laser beam sequently. Linear polarization measurements were performed. The results showed that the depolarization ratios are wavelength-dependent, and the identification of bioaerosols can be achieved through the application of Euclidian correlation degree and Mhalanobis distance.

Multiple scattering is an important factor for measuring water optical characteristic parameters (including absorption coefficient a, attenuation coefficient c, diffuse attenuation coefficient Kd) by lidar. Meanwhile, field of view (FOV) is a key parameter which affects the proportion of multiple scattering in receiving echoes. A parameter of FOV (θrcvr) is introduced into the inversion method of water optical properties by ocean lidar based on the Mclean-Walker model. In the cases of shipboard, airborne and spaceborne platforms at the height of 10, 300, 7×105 m respectively, scattering echoes are calculated according to the lidar theory. The inversion of water optical parameters is analyzed with multiple scattering factor under different FOVs. It is shown that assuming the incident laser of highly collimated, θrcvr and detecting height H are critical factors which influence inversion results in the method for obtaining water optical parameters from laser scattering echo. It is worth noting that the physical meaning of the lidar attenuation coefficient Klidar changes with the factors. Klidar can be considered as c when θrcvr is approximately 0. And Klidar gradually approaches Kd with the increase of θrcvr×H.

In order to meet the quantitative application requirements of the hyperspectral remote sensing images, to solve the problem that the synchronous atmospheric parameters can not be achieved for the existed atmospheric correction methods, the atmospheric correctional technology based on the atmospheric parameter space synchronization acquisition was investigated. Firstly, the method of using remote sensing technology to apply synchronous parameters and the sampling of surface reflectance is summarized. Secondly, based on the research results of hyperspectral remote sensing satellite in orbit, the technical indexes and characteristics in the designation of atmospheric corrector especially about the wavebands studies are summarized. The atmospheric correction of hyperspectral images is accomplished from EO-1 Hyperion sensor, and the improvements of application performance are analyzed in the following aspects: imaging results, spectral characteristics, and classification effects of typical features. In the end, the development of atmospheric radiation correction technology is prospected.

Spaceborne laser altimeter has the characteristics of large calibration site, large amounts of detectors, poor work conditions. To achieve the goal of precise timing, data collection and processing of ground-based calibration system, a software designing scheme is put forward, and the implementation algorithm of the software is introduced in detail. With expanding its peripheral equipment, the function of data processing and timing is mainly realized. At the same time, four modules of the systan are module of processing time tag data, calculating the centroid of laser footprint in the ground, correcting the atmospheric refraction delay, and timing. The data from “ZY3-02” satellite is processed in site experiments, and the results show that the design of the software is feasible.