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首页> 外文会议>Atmospheric and environmental remote sensing data processing and utilization VI: Readiness for GEOSS IV >Extended Inter-comparison of collocated MetOp-A AVHRR-IASI brightness temperature data and its implication for AVHRR calibration
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Extended Inter-comparison of collocated MetOp-A AVHRR-IASI brightness temperature data and its implication for AVHRR calibration

机译：并置的MetOp-A AVHRR-IASI亮度温度数据的扩展比对及其对AVHRR校准的意义

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摘要

The collocated measurements in 3.74um, 1 lμm, and 12μm channels from Advanced Very High Resolution Radiometer (AVHRR) and corresponding simulated AVHRR measurements using hyper-spectral Infrared Atmospheric Sounding Interferometer (IASI) observations are inter-compared. Both of the instruments are placed on MetOp-A satellite launched in October 2006. Because IASI observations did not have complete spectral coverage over AVHRR 3.74 urn channel, Line-By-Line Radiative Transfer Model (LBLRTM) simulated IASI spectra were generated to enable complete IASI coverage for this channel. It is shown that the large AVHRR minus IASI negative bias in 3.74 μm channel can be explained more or less completely by the part of the AVHRR spectral band not seen by IASI which is an indication of relatively large absorption in that particular portion of the AVHRR spectral band. The near similarity between slopes of bias dependency on scene radiance from the model and those derived from observations with respect to 3.74 μm channel indicate that it could be mostly the CO_2 absorption in the higher wave-numbers experienced by AVHRR and not experienced by IASI causing the discrepancy between these two observations. Thus the study confirms that AVHRR short wave infrared channel (3.74 μm) is performing very well with no indication, of spectral uncertainties, or of significant radiometric uncertainties. On the other hand, the results suggest that AVHRR 3.74 μm channel experiences significant CO_2 absorption which may disqualify it from being recognized as a "window channel". With respect to long wave infrared channels at 11 μm and 12 μm the study reveals that the bias between the two measurements undergo seasonal variations, however ,with small magnitudes.
机译：将高级超高分辨率辐射计（AVHRR）在3.74um，1lμm和12μm通道中的并置测量与使用高光谱红外大气探测干涉仪（IASI）观测值的相应模拟AVHRR测量进行了相互比较。两种仪器都放置在2006年10月发射的MetOp-A卫星上。由于IASI观测尚未在AVHRR 3.74 urn通道上获得完整的光谱覆盖，因此生成了逐行辐射传输模型（LBLRTM）模拟的IASI光谱以实现完整IASI对此频道的报道。结果表明，3.74μm通道中较大的AVHRR减去IASI负偏差可以由IASI未看到的部分AVHRR光谱带完全解释，这表明在该AVHRR光谱的特定部分中吸收较大带。该模型对场景辐射的偏倚斜率与从观测值获得的斜率之间的相似度接近3.74μm通道，这表明AVHRR经历的高波数中大部分是CO_2吸收，而IASI则没有，导致这两个观察结果之间存在差异。因此，该研究证实了AVHRR短波红外通道（3.74μm）的性能非常好，没有迹象表明光谱不确定性或明显的辐射不确定性。另一方面，结果表明AVHRR 3.74μm通道经历了显着的CO_2吸收，这可能会使该通道无法被识别为“窗口通道”。对于11μm和12μm的长波红外通道，研究表明，两次测量之间的偏差会发生季节性变化，但是幅度较小。

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