常用遥感上行长波辐射产品在两极的精度研究

针对GEWEX-SRB（Global Energy and Water Exchanges Project-Surface Radiation Budget）、ISCCP-FD（International Satellite Cloud Climatology Project-Flux Data）和CERES-SYN（Clouds and the Earth′s Radiant Energy System-Synoptic Radiative Fluxes and Clouds）中上行长波辐射数据在极地地区的精度问题展开研究。实验利用极地地区的BSRN（Baseline Surface Radiation Network）和CEOP（Coordinated Energy and Water Cycle Observations Project）两种地面观测数据作为参考数据，并采用降尺度方法对地面数据进行处理，最后对辐射产品进行精度评估。研究结果显示，在极地地区，3种常用上行长波辐射数据总体精度较低，方均根误差（RMSE）和平均绝对偏差（MAE）的绝对值基本在15 W·m-2以上，GEWEX-SRB、ISCCP-FD和CERES-SYN上行长波辐射产品的RMSE均值分别为23.70 W·m-2（8.69%）、25.14 W·m-2（9.62%）、22.98 W·m-2（8.80%），MAE均值分别为18.53 W·m-2（6.96%）、20.09 W·m-2（7.70%）、17.73 W·m-2（6.79%）。通过精度分析得出，影响上行长波辐射产品精度的因素包括空间异质性、输入参数误差、云的影响以及辐射产品的空间分辨率较低等。

Abstract

Accuracy of the upward longwave radiation data of GEWEX-SRB (Global Energy and Water Exchanges Project-Surface Radiation Budget), ISCCP-FD (International Satellite Cloud Climatology Project-Flux Data) and CERES-SYN (Clouds and the Earth′s Radiant Energy System-Synoptic Radiative Fluxes and Clouds) in polar regions is studied. In the experiment, two kinds of ground observation data of BSRN (Baseline Surface Radiation Network) and CEOP (Coordinated Energy and Water Cycle Observations Project) in polar regions are used as reference data, and the downscaling method is used to deal with them. Finally, accuracy of the radiation products is evaluated. Research results show that the overall accuracies of the three kinds of commonly used upward longwave radiation data are lower in polar regions. Absolute values of the root mean square error (RMSE) and the mean absolute error (MAE) are more than 15 W·m-2. The mean RMSEs of GEWEX-SRB, ISCCP-FD and CERES-SYN are 23.70 W·m-2 (8.69%), 25.14 W·m-2 (9.62%) and 22.98 W·m-2 (8.80%), respectively, and the mean MAEs are 18.53 W·m2 (6.96%), 20.09 W·m2 (7.70%), and 17.73 W·m2 (6.79%), respectively. Through the analysis of accuracy, the factors that affect the accuracy of the upward longwave radiation products include spatial heterogeneity, input parameter errors, cloud influence and low spatial resolution of radiation products and so on.

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孙道中, 吉长东, 马传宁. 常用遥感上行长波辐射产品在两极的精度研究[J]. 激光与光电子学进展, 2018, 55(7): 070101. Sun Daozhong, Ji Changdong, Ma Chuanning. Accuracy Research of Commonly Used Remote Sensing Upward Longwave Radiation Products in Polar Regions[J]. Laser & Optoelectronics Progress, 2018, 55(7): 070101.

常用遥感上行长波辐射产品在两极的精度研究

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