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Intercomparison of integrated IASI and AATSR calibrated radiances at 11 and 12 μm

机译：集成IASI和AATSR校准辐射在11和12μm处的比对

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The mission objectives of the Infrared Atmospheric Sounding Interferometer (IASI) are driven by the needs of the Numerical Weather Prediction (NWP) and climate monitoring communities. These objectives rely upon the IASI instrument being able to measure top of atmosphere radiances accurately. This paper presents a technique and first results for the validation of the radiometric calibration of radiances for IASI, using a cross-calibration with the Advanced Along Track Scanning Radiometer (AATSR). The AATSR is able to measure Brightness Temperature (BT) to an accuracy of 30mK, and by applying the AATSR spectral filter functions to the IASI measured radiances we are able to compare AATSR and IASI Brightness Temperatures. By choosing coincident data points that are over the sea and in clear sky conditions, a threshold of homogeneity is derived. It is found that in these homogenous conditions, the IASI BTs agree with those measured by the AATSR to within 0.3 K, with an uncertainty of order 0.1 K. The agreement is particularly good at 11 μm where the difference is less than 0.1 K. These first results indicate that IASI is meeting its target objective of 0.5 K accuracy. It is believed that a refinement of the AATSR spectral filter functions will hopefully permit a tighter error constraint on the quality of the IASI data and hence further assessment of the climate quality of the radiances.
机译：红外大气探测干涉仪（IASI）的任务目标是由数值天气预报（NWP）和气候监测团体的需求驱动的。这些目标取决于IASI仪器能够准确测量大气层顶部的辐射。本文介绍了一种技术，并通过与先进的沿航迹扫描辐射仪（AATSR）进行交叉校准，对IASI辐射的辐射校准进行了验证。 AATSR能够以30mK的精度测量亮度温度（BT），通过将AATSR光谱滤镜功能应用于IASI测量的辐射度，我们可以比较AATSR和IASI亮度温度。通过选择海上和晴朗天空条件下的重合数据点，可以得出同质性阈值。发现在这些同质条件下，IASI BTs与AATSR测得的结果一致，在0.3 K以内，不确定度为0.1K。该一致性特别好，在11μm处，相差小于0.1K。初步结果表明，IASI已达到其0.5 K精度的目标。可以相信，对AATSR频谱滤波器功能的改进将有望允许对IASI数据的质量施加更严格的误差约束，从而进一步评估辐射的气候质量。

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