Optical properties and size distribution of aerosols derived from simultaneous measurements with lidar, a sunphotometer, and an aureolemeter.
Optical properties and size distribution of aerosols derived from simultaneous measurements with lidar, a sunphotometer, and an aureolemeter.
复制标题
DOI：
10.1364/ao.38.001630
复制
发表时间：
1999-03
期刊：
影响因子：
1.9
通讯作者：
T. Hayasaka;Y. Meguro;Y. Sasano;T. Takamura
中科院分区：
文献类型：
--
作者：
T. Hayasaka;Y. Meguro;Y. Sasano;T. Takamura
提出了一种新方法，通过使用激光雷达、太阳光度计和光环计同时测量后向散射系数、光学厚度和太阳光环强度，得出气柱中气溶胶的光学特性和尺寸分布。由于后向散射特性和光学厚度取决于复折射率和尺寸分布，而前向散射特性主要取决于尺寸分布，因此可以从这些测量中获取气溶胶的实部和虚部折射率以及尺寸分布。 1991年11月至1992年3月在日本筑波获得的气溶胶在500 nm波长下的复折射率的实部和虚部估计分别为1.46-1.48和0.005-0.014。从总柱状气溶胶中平流层气溶胶的粒径分布和光学厚度分数推断，这些结果反映了源于皮纳图博火山喷发的平流层气溶胶的影响。
A new method is proposed to derive the optical properties and size distribution of aerosol in an air column from simultaneous measurements of the backscattering coefficient, the optical thickness, and the solar aureole intensity with lidar, a sunphotometer, and an aureolemeter. Inasmuch as the backscattering properties and the optical thickness depend on both the complex refractive index and the size distribution, whereas the forward-scattering properties depend mainly on the size distribution, real and imaginary indices of refraction and size distributions of aerosol are retrieved from these measurements. The real and the imaginary parts of the complex refractive index of an aerosol at a wavelength of 500 nm during the period from November 1991 to March 1992 obtained in Tsukuba, Japan, were estimated to be 1.46-1.48 and 0.005-0.014, respectively. It is inferred from the size distribution and an optical thickness fraction of stratospheric aerosols in the total columnar aerosols that these results reflect the influences of stratospheric aerosols that originated from the Mt. Pinatubo eruption.