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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >INTERCOMPARISON BETWEEN TWO SATELLITE-BASED PRODUCTS OF NET SURFACE SHORTWAVE RADIATION
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INTERCOMPARISON BETWEEN TWO SATELLITE-BASED PRODUCTS OF NET SURFACE SHORTWAVE RADIATION

机译：两种基于卫星的净表面短波辐射比对

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This study compares two global satellite-based surface radiation budget (SRB) data sets as a means of quality evaluation. One was developed from Earth Radiation Budget Experiment (ERBE) satellite data using the algorithm of Li et al. (ERBE/SRB), and the other was generated by applying the algorithm of Pinker and Laszlo to International Satellite Cloud Climatology Project (ISCCP/SRB) data. The comparison is limited to net surface shortwave radiation (NSSR). The global annual mean of NSSR obtained from the two data sets differ by 15 W m(-2), and maximum regional differences exceed 100 W m(-2). The differences are investigated in terms of discrepancies in both input data and algorithm. It was found that large regional differences in SRB are associated mainly with the discrepancies in the input parameters, namely, top-of-atmosphere (TOA) flux and precipitable water. Differences in TOA flux between ERBE and ISCCP are attributed to angular and spectral corrections for ISCCP data and to different sampling in time and space by ERBE and ISCCP. ISCCP/SRB underestimates NSSR by 20-30 W m(-2) over some dry regions arising from excessive amounts of precipitable water from the TIROS operational vertical sounder. Deficient treatment of aerosol in the Li et al. algorithm results in too large NSSR for the major deserts. Systematic discrepancies are accounted for by different methods to compute water vapor absorption. According to the line-by-line results, water vapor absorption was significantly underestimated by the Lacis and Hansen parameterization (used by Pinker and Laszlo) and is moderately overestimated by LOWTRAN 6 (used by Li et al.). If both algorithms use the same water vapor absorption scheme and the same input data, their global annual mean of NSSR agree to within 1 W m(-2). On the basis of these findings, some recommendations are made for future improvements of the two products. Overall, it appears that the quality of ERBE/SRB is superior to that of ISCCP/SRB (version 1.1). [References: 46]
机译：这项研究比较了两个基于卫星的全球地面辐射预算（SRB）数据集，作为质量评估的一种手段。一种是使用Li等人的算法根据地球辐射预算实验（ERBE）卫星数据开发的。 （ERBE / SRB），另一个是通过将Pinker和Laszlo算法应用于国际卫星云气候项目（ISCCP / SRB）数据而生成的。比较仅限于净表面短波辐射（NSSR）。从这两个数据集获得的NSSR的全球年平均值相差15 W m（-2），最大区域差异超过100 W m（-2）。根据输入数据和算法的差异研究了差异。研究发现，SRB的较大区域差异主要与输入参数（大气顶（TOA）通量和可沉淀水）的差异有关。 ERBE和ISCCP之间TOA通量的差异归因于ISCCP数据的角度和频谱校正，以及ERBE和ISCCP在时间和空间上的不同采样。 ISCCP / SRB在一些干燥区域低估了20-30 W m（-2）的NSSR，这是由于TIROS垂直探测器发出的过量可沉淀水引起的。 Li等人对气雾剂的处理不足。对于主要沙漠地区，该算法会导致NSSR太大。系统差异是通过不同方法来计算水蒸气吸收的原因。根据逐行结果，通过Lacis和Hansen参数化（由Pinker和Laszlo使用）显着低估了水蒸气的吸收，而由LOWTRAN 6（由Li等人使用）适度高估了水蒸气的吸收。如果两种算法使用相同的水蒸气吸收方案和相同的输入数据，则其NSSR的全球年平均值在1 W m（-2）之内。基于这些发现，针对两种产品的未来改进提出了一些建议。总体而言，看来ERBE / SRB的质量优于ISCCP / SRB（1.1版）。 [参考：46]

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