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1、AIRS晴空大气温度廓线反演试验刘 辉 1 董超华 1 张文建 2 张 鹏 11. 中国气象局国家卫星气象中心 , 北京 , 1000812. 中国气象局 , 北京, 100081摘要2002 年 5 月发射的 Aqua 是美国地球观测系统中的第 2 颗卫星 EOS-2(Earth Observing System)，它携带的大气红外探测仪 AIRS ( Atmospheric Infrared Sounder)是目前国际上最 先进的超高光谱分辨率红外大气垂直探测仪。 1200 的光谱分辨率和全球覆盖能力使其可以 观测全球大气状态及其变化。对其超高光谱分辨率资料的处理和应用的研究既有科学意义，
2、 又有实用价值。 利用 AIRS 实际观测资料反演大气温度，本文使用的是便于处理大数据量的 统计反演方法中的特征向量法，计算回归系数使用的是 AIRS 观测辐射值和 T213 数值预报 分析场。本文从通道个数、地形及地表发射率影响、增加预报因子、国外同类产品比较等 4 个方面进行了大气温度反演试验研究。研究结果表明:( 1)在利用超高光谱分辨率仪器进行反演时，合理选择通道是非常必要的； (2) AIRS 反演的大气温度在对流层顶和中上层具有 较高的精度，在对流层低层，尤其是近地面反演精度不够理想；( 3)增加地表温度，地表发射率和地形 3 个预报因子， 可以提高近地面的反演精度； ( 4)文中
3、反演的大气温度精度与国 外同类产品精度基本一致。关键词 AIRS ，反演，大气温度 中图法分类号 P412.25 P407.6 资助课题：国家自然科学基金项目 (40605015) 。 作者简介：刘辉，主要从事逐线积分模式和大气参数反演研究。 Email:liuhui 2007-01-31收稿,2007-04-06改回 .Retrieval of clear-air atmospheric temperature profiles using AIRSobservations1 1 2 1LIU Hui 1 DONG Chaohua 1 ZHANG Wenjian 2 ZHANG Peng 1
4、1. National Satellite Meteorological Center, Beijing 100081, China2. China Meteorological Administration, Beijing 100081, ChinaAbstractAtmospheric Infrared Sounder (AIRS )is on board the EOS- 2/ Aqua satellite, launched on May 4, 2002. It is now an advanced atmospheric remote sensing instrument with
5、 a super high spectral resolution and a global detection coverage in the world. Study on AIRS data processing is of significance in both science and operational application. In the retrieval of atmospheric temperature from the AIRS observations, the eigenvector method is used, and collocated AIRS br
6、ightness temperature and corresponding T213 temperature analyses fields are used to compute the regression coefficients. The study includes the following aspects: selection of spectral channels, impacts of surface emissivity and topography, determination of additional predictors, and comparison of r
7、etrieval results. Research results indicate that: (1) it is very essential to rationally choose the channels when retrieving atmospheric temperature with the high spectral resolution AIRS data; (2) AIRS data can significant improve the retrieval accuracy of temperature in mid- upper troposphere and
8、at the tropopause, however in the lower troposphere, especially near the surface, the accuracy is not satisfactory; (3) different surface emissivity and topography will affect retrieval result; (4) factors reflecting surface radiation nature, such as surface temperature, surface emissivity, and topography, are selected as additional predictors, which improves the retrieval accuracy near the surface; (5) AIRS retrieval accuracy in this paper is consistent with the AIRS teams.Key words Atmospheric Infrared Sounder, Retrieval, Atmospheric temperature, Clear - air
AIRS晴空大气温度廓线反演试验
