INDOEX for NOAA/CMDL: Measurements of the Dependence of the Aerosol Light Scattering Coefficient on Wavelength, Scattering Angle, Particle Size, and Relative Humidity During INDOEX

ATM 96 12888John A.奥格伦和帕特里克J.谢里丹 *（共同PI）NOAA气候监测和诊断实验室，* 也在科罗拉多大学，环境科学合作研究所。INDOEX期间气溶胶光散射系数对波长、散射角、颗粒大小和相对湿度的依赖性的测量。Ogren博士和谢里丹在INDOEX中的作用是测量气溶胶光散射系数，并表征其对波长、散射角、颗粒大小和相对湿度的依赖性。测量将由NCAR C-130使用两个连续运行的积分浊度计进行，结果将用于一些封闭实验，以及评估直接辐射强迫。具体而言，直接测量值的气溶胶总散射和半球后向散射系数，在40%和85%的相对湿度，将与其他INDOEX研究人员的气溶胶数浓度和化学成分的尺寸分布的测量计算值进行比较。浊度计的测量，当与测量的光吸收系数相结合时，将允许评估气溶胶光散射系数，不对称参数（或上散射分数）和单次散射的垂直廓线;总的气溶胶光学厚度和气溶胶辐射强迫将从这些垂直廓线计算，并与这些参数的测量值进行比较。

ATM 96 12888John A. Ogren and Patrick J. Sheridan* (co-PI's) NOAA Climate Monitoring and Diagnostics Laboratory,*also at University of Colorado, Cooperative Institute for Research in Environmental Sciences.Measurements of the dependence of the aerosol light scattering coefficient on wavelength, scattering angle, particle size, and relative humidity during INDOEXAbstract. Dr. Ogren and Sheridan's role in INDOEX is to measure the aerosol light scattering coefficient and characterize its dependence on wavelength, scattering angle, particle size, and relative humidity. The measurements will be made from the NCAR C-130 using two integrating nephelometers operated in series, and the results will be used in a number of closure experiments, as well as for evaluating the direct radiative forcing. Specifically, the directly measured values of the aerosol total scattering and hemispheric backscattering coefficients, at 40% and 85% relative humidity, will be compared with values calculated from measurements by other INDOEX researchers of the size distributions of aerosol number concentration and chemical composition. The nephelometer measurements, when combined with the measured light absorption coefficient, will allow evaluation of the vertical profiles of aerosol light scattering coefficient, asymmetry parameter (or upscatter fraction), and single-scattering albedo; the total aerosol optical depth and aerosol radiative forcing will be calculated from these vertical profiles and compared with the measured values of these parameters.