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Model development for MODIS thermal band electronic crosstalk

机译：MODIS热带电子串扰的模型开发

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MODerate-resolution Imaging Spectroradiometer (MODIS) has 36 bands. Among them, 16 thermal emissive bands covering a wavelength range from 3.8 to 14.4 μm. After 16 years on-orbit operation, the electronic crosstalk of a few Terra MODIS thermal emissive bands developed substantial issues that cause biases in the EV brightness temperature measurements and surface feature contamination. The crosstalk effects on band 27 with center wavelength at 6.7 μm and band 29 at 8.5 μm increased significantly in recent years, affecting downstream products such as water vapor and cloud mask. The crosstalk effect is evident in the near-monthly scheduled lunar measurements, from which the crosstalk coefficients can be derived. The development of an alternative approach is very helpful for independent verification. In this work, a physical model was developed to assess the crosstalk impact on calibration as well as in Earth view brightness temperature retrieval. This model was applied to Terra MODIS band 29 empirically to correct the Earth brightness temperature measurements. In the model development, the detector's nonlinear response is considered. The impact of the electronic crosstalk is assessed in two steps. The first step consists of determining the impact on calibration using the on-board blackbody (BB). Due to the detector's nonlinear response and large background signal, both linear and nonlinear coefficients are affected by the crosstalk from sending bands. The second step is to calculate the effects on the Earth view brightness temperature retrieval. The effects include those from affected calibration coefficients and the contamination of Earth view measurements. This model links the measurement bias with crosstalk coefficients, detector nonlinearity, and the ratio of Earth measurements between the sending and receiving bands. The correction of the electronic crosstalk can be implemented empirically from the processed bias at different brightness temperature. The implementation can be done through two approaches. As routine calibration assessment for thermal infrared bands, the trending over select Earth scenes is processed for all the detectors in a band and the band averaged bias is derived at a certain time. In this case, the correction of an affected band can be made using the regression of the model with band averaged bias and then corrections of detector differences are applied. The second approach requires the trending for individual detectors and the bias for each detector is used for regression with the model. A test using the first approach was made for Terra MODIS band 29 with the biases derived from long-term trending of brightness temperature over ocean and Dome-C.
机译：适度分辨率的成像光谱辐射器（MODIS）有36个频段。其中，覆盖波长范围为3.8至14.4μm的16个热发射带。 16年后的轨道操作后，几个Terra Modis热发射带的电子串扰开发了大量问题，导致EV亮度温度测量和表面特征污染中的偏差。近年来，在6.7μm和8.5μm的带状波长下，带有中心波长的串联27的串扰效应在8.5μm处增加，影响了水蒸气和云掩模等下游产品。在接近月的调度月度测量中，串扰效应是显而易见的，可以从中导出串扰系数。开发替代方法对于独立验证非常有用。在这项工作中，开发了一种物理模型来评估串扰对校准的影响以及地球视图亮度温度检索。该模型对Terra Modis Band 29凭经验校正校正地球亮度温度测量。在模型开发中，考虑了探测器的非线性响应。电子串扰的影响分两步评估。第一步包括使用车载黑体（BB）来确定对校准的影响。由于检测器的非线性响应和大背景信号，线性和非线性系数都受到发送带的串扰的影响。第二步是计算对地球视图亮度温度检索的影响。这些效果包括来自受影响的校准系数和地球视图测量的污染。该模型将测量偏差与串扰系数，检测器非线性和发送接收频带之间的地球测量比率联系起来。电子串扰的校正可以从不同亮度温度的处理后的偏压凭经验地实现。可以通过两种方法来完成。作为热红外频带的常规校准评估，在频带中的所有探测器和频段平均偏置的所有探测器都是在一定时间的情况下被处理的趋势校准评估。在这种情况下，可以使用带有带平均偏压的模型的回归来进行受影响的频带的校正，然后应用探测器差异的校正。第二种方法需要为各个检测器的趋势和每个检测器的偏置用于与模型的回归。使用第一种方法的测试是针对Terra Modis带29进行的，其偏差来自海洋和圆环C的长期趋势温度的长期趋势。

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