基于CALIPSO数据的贵州气溶胶时空分布与光学特性研究

Study on the Spatio-temporal Distribution and Optical Properties of Aerosols in Guizhou based on CALIPSO data

摘要:

基于2014—2023十年的Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation（CALIPSO）5 km Aerosol Layer二级产品和Aerosol Profile三级产品，分析了贵州气溶胶时空分布特征以及光学特性。结果表明：（1）贵州气溶胶光学厚度高值主要集中在黔西南、黔南（春季和夏季最显著）和贵阳（冬季最显著）；（2）2014—2023年间，遵义和黔南AOD呈上升趋势，黔东南和铜仁AOD呈下降趋势，贵阳AOD十年间的整体变化趋势不显著；（3）贵州气溶胶消光系数在垂直方向上随高度增加而递减，沙尘、污染沙尘和抬升烟尘的全年消光贡献分别为8%、29%和21%；（4）经向分布上，气溶胶消光层的高度自东向西随着海拔高度增加而逐渐升高；纬向分布上，气溶胶弱消光层在纬度较低地区的抬升高度更高；（5）粒子退偏比（0.0~1.0）越大表明粒子不规则程度越强，贵州气溶胶粒子退偏比偏小（平均值0.098），不规则程度偏弱；颜色比（0.0~4.0）随粒子粒径增大而增大，贵州气溶胶粒子颜色比偏小（平均值0.738），粒子尺度偏小。

Abstract:

Based on the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) Level 2 5 km Aerosol Layer and Level 3 Aerosol Profile products for the decade (2014—2023), the spatio-temporal distribution and aerosol optical properties in Guizhou are analyzed. The results showed that: (1) The high values of aerosol optical depth in Guizhou are mainly concentrated in Qianxinan, Qiannan (significant in spring and summer) and Guiyang (significant in winter); (2) Between 2014 and 2023, AOD in Zunyi and Qiannan showed an upward trend, while AOD in Qiandongnan and Tongren showed a downward trend, and the overall trend of AOD in Guiyang over the past decade was not significant; (3) The aerosol extinction coefficient in Guizhou decreases with increasing height. The annual extinction contributions of dust, polluted dust, and elevated smoke are 8%, 29%, and 21%, respectively; (4) In the longitudinal distribution, the height of the aerosol extinction layer rises gradually from east to west as the altitude increases; In the latitudinal distribution, the weak extinction layer lifts higher in lower latitudes; (5) The larger particulate depolarization ratio (0.0~1.0) indicates stronger irregularity of particles, the particulate depolarization ratio of aerosol particles in Guizhou is relatively small (mean value 0.098), indicating weaker irregularity. The color ratio (0.0~4.0) increases as particle size increases, and the color ratio of aerosol particles in Guizhou is relatively small (mean value 0.738), indicating smaller particle size.