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 12888 John A.Ogren和Patrick J.Sheridan*(合作者)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*。INDOEXT期间气溶胶光散射系数与波长、散射角、颗粒大小和相对湿度的关系的测量。Ogren博士和Sheridan博士在INDOEX中的作用是测量气溶胶的光散射系数，并表征其对波长、散射角、颗粒大小和相对湿度的依赖关系。这些测量将在NCARC C-130上使用两个串联操作的积分浊度计进行，结果将用于一些封闭实验，以及用于评估直接辐射强迫。具体地说，在相对湿度为40%和85%时，直接测量的气溶胶总散射系数和半球后向散射系数将与其他INDOEX研究人员测量的气溶胶数浓度和化学成分的尺寸分布计算的值进行比较。浊度计测量与测量的光吸收系数相结合，将能够评估气溶胶光散射系数、不对称参数(或上散射分数)和单次散射反照率的垂直剖面；总气溶胶光学厚度和气溶胶辐射强迫将从这些垂直剖面计算出来，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.