-
设计和构建了波长为355, 532和1064 nm的多波长米散射激光雷达系统, 并研究了多波长激光雷达信号数据处理和反演算法, 实现了对地表气溶胶的探测; 利用该激光雷达对2013年冬季西安市上空大气进行了探测, 研究分析了雾霾天、晴天和有云天气的混合层高度、气溶胶消光特征和粒径分布特征. 分析比较了不同波长探测到的混合层高度变化情况. 在雾霾天, 大气混合层高度与晴天和有云天相比明显偏低, 在0.4 km附近, 而晴天的混合层高度有0.5–0.8 km. 利用长波(1064 nm/532 nm)段和短波(532 nm/355 nm)段两个Ångström指数分析了不同天气情况下的粒径分布特征. 对于近地层气溶胶, 雾霾天的长波Ångström (1064/532)指数小于短波Ångström (532/355)指数, 而晴天与之相反, 说明在近地层雾霾有污染的大气中, 存在有较多的粗粒子. 在云层中, Ångström指数明显减小, 并且出现负值, 说明云粒子半径比较大.A multi-wavelength Mie-scattering lidar is designed and established for detecting the aerosol profiles under different weather conditions. And inversion algorithm about multi-wavelength lidar signal is studied. The atmosphere observations are carried out in Xi'an city in the winter of 2013 by using the multi - wavelength lidar. The mixed-layer depth, aerosol particle size characteristics, and atmosphere extinction are studied and analyzed on haze, cloudy and sunny days. The mixed layer depth is lower on haze day and is just about 0.4 km, while it can reach 0.5-0.8 km on sunny day. The aerosol particle characteristics are discussed under different weather conditions by using two Ångström exponents, one for the short - wavelength range (355 nm/532 nm) and other for long-wavelength range (532 nm/1064 nm). The long-wavelength Ångström exponent is less than the short-wavelength Ångström exponent on haze day, and it is contrary on sunny day. The results show that there are more coase particles on pollution day. The Ångström exponents significantly decrease, and even become negative in the clouds, showing that cloud particles are relatively large.
-
Keywords:
- multi-wavelength lidar /
- aerosol /
- Å /
- ngströ /
- m exponent /
- mixed-layer depth
[1] Fernald F G 1984 Appl. Opt. 23 652
[2] Liu H T, Chen L F, Su L 2011 Acta Phys. Sin. 60 064204 (in Chinese) [刘厚通, 陈良富, 苏林 2011 60 064204]
[3] Zhang Z Y, Su L, Chen L F 2013 Chin. J. Lasers. 40 0513002 (in Chinese) [张朝阳, 苏林, 陈良富 2013 中国激光 40 0513002]
[4] Chi R L, Wu D C, Liu B, Zhou J 2009 Spectrosc. Spectr. Anal. 29 1468 (in Chinese) [迟如利, 吴德成, 刘博, 周军 2009 光谱学与光谱分析 29 1468]
[5] Albert A, Frank W, Detlef M, Dietrich A, Andreas H, Wolfgang V H, Ulla W 2002 J. Geophys. Res. 107 4259
[6] Chen T, Wu D C, Liu B, Cao K F, Wang Z Z, Bo G Y, Yuan L, Zhou J 2008 Acta Opt. Sin. 30 1531 (in Chinese) [陈涛, 吴德成, 刘博, 曹开发, 王珍珠, 伯广宇, 袁林, 周军 2008 光学学报 30 1531]
[7] Flamant C, Pelon J, Flamant P H, Durand P 1997 Boundary-Layer Meteorol. 83 247
[8] Di H G, Hua D X, Wang Y F, Yan Q 2013 Acta Phys. Sin. 62 094215 (in Chinese) [狄慧鸽, 华灯鑫, 王玉峰, 闫庆 2013 62 094215]
-
[1] Fernald F G 1984 Appl. Opt. 23 652
[2] Liu H T, Chen L F, Su L 2011 Acta Phys. Sin. 60 064204 (in Chinese) [刘厚通, 陈良富, 苏林 2011 60 064204]
[3] Zhang Z Y, Su L, Chen L F 2013 Chin. J. Lasers. 40 0513002 (in Chinese) [张朝阳, 苏林, 陈良富 2013 中国激光 40 0513002]
[4] Chi R L, Wu D C, Liu B, Zhou J 2009 Spectrosc. Spectr. Anal. 29 1468 (in Chinese) [迟如利, 吴德成, 刘博, 周军 2009 光谱学与光谱分析 29 1468]
[5] Albert A, Frank W, Detlef M, Dietrich A, Andreas H, Wolfgang V H, Ulla W 2002 J. Geophys. Res. 107 4259
[6] Chen T, Wu D C, Liu B, Cao K F, Wang Z Z, Bo G Y, Yuan L, Zhou J 2008 Acta Opt. Sin. 30 1531 (in Chinese) [陈涛, 吴德成, 刘博, 曹开发, 王珍珠, 伯广宇, 袁林, 周军 2008 光学学报 30 1531]
[7] Flamant C, Pelon J, Flamant P H, Durand P 1997 Boundary-Layer Meteorol. 83 247
[8] Di H G, Hua D X, Wang Y F, Yan Q 2013 Acta Phys. Sin. 62 094215 (in Chinese) [狄慧鸽, 华灯鑫, 王玉峰, 闫庆 2013 62 094215]
计量
- 文章访问数: 8558
- PDF下载量: 652
- 被引次数: 0
下载:
