摘要
本文提出了一种基于大气辐射传输方程，利用NOAA－14极轨卫星甚高分辨率辐射计（AVHRR）可见光单通道反射率资料，运用低光谱分辨率大气辐射传输模式程序（LOWTRAN－7）反演晴空条件下、均匀下垫面上的气象能见度和大气气溶胶光学厚度的算法。其突出优点是在下垫面反射率均一的情况下，这种算法不受了型面反射率本身的数值限制，作为这种方法应用的实例，反演了晴空大气状况下太平洋上约6×10km2海域（27°N，128°E）的气象能见度和气溶胶光学厚度．细致地剖析和处理了气溶胶卫星单通道反演中卫星定标、滤云、光谱滤波和大气因子参数化等基本步骤，其中对大气水汽含量的实时反演方法，使其剧烈的时空变化性不再成为气溶胶光学厚度反演过程中的困难。同时分析了反演误差产生的主要原因。
An algorithm based on equation of radiative transfer is developed to retrieve the meteorological visibility and aerosol optical thlckness using satellite imagery data of NOAA- 14/AVHRR for cloudless atmosphere. This algorithm is carried out with LOWTRAN-7 radiative transfer code. Independence of the value of underlying surface reflectance is the significant advantage of the algorithm. As an example casestudy is given over an area of about 6 ×10km2 in tropic pacific ocean surface (27°N, 128°E). In the case, the retrieval steps of aerosolincluding radiometer calibration,selection cloudless pixels,using of spectral-filter function ofthe radiometer and atmosphere parameterizatlon are treated carefully. The atmospheric watervapour conient is obtained from infrared channels of the same satellite,so that it makes thespatial and temporal variations of water vapour content being not a problem in the retrievalof atmospheric aerosols'optical thickness. The reason for error is also analyzed.
出处
《气象科学》
CSCD
北大核心
1997年第2期159-167,共9页
Journal of the Meteorological Sciences
关键词
气溶胶
光学厚度
整层大气
卫星
可见通道
Satellite monitoring and retrieval
aerosol optical thickness and extinition coefficient
meteorological visibility
