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Evaluating Calibration of MODIS Thermal Emissive Bands Using Infrared Atmospheric Sounding Interferometer Measurements

机译：使用红外大气探测干涉仪测量评估MODIS热发射带的校准

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摘要

This paper evaluates the performance of MODIS (Terra and Aqua) thermal emissive bands using current Collection 5 (C5) and newly released Collection 6 (C6) Level IB products with a focus on relative differences between the two instruments. Data from the Infrared Atmospheric Sounding Interferometer (IASI) serves as a transfer reference. Comparison was conducted using observations from simultaneous nadir overpasses (SNO) of the Metop-A satellite and Terra/Aqua satellites. SNO times and locations were determined based on satellite orbital two-line element sets and the SNO time difference was limited to within 30 seconds. Each IASI instantaneous field of view of 12 km is co-located with multiple MODIS pixels. The corresponding IASI simulated MODIS radiances are derived by convolutions of IASI hyperspectral data and MODIS relative spectral response functions. Data analysis results show that correlations of MODIS aggregated brightness temperature (BT) and IASI simulated BT are greater than 0.9. Differences between Aqua and Terra MODIS C5 are ranging between 2 and 6 K at lower BT and are within ±1 K at higher BT for photovoltaic bands 20-25 and 27-30. Corresponding differences from C6 products are significantly reduced to less than 2 K (except band 20). For photoconductive bands 31-36, measurements from MODIS C5 and C6 are nearly within ±1 K between Aqua and Terra.
机译：本文使用当前的Collection 5（C5）和新发布的Collection 6（C6）IB级产品评估了MODIS（Terra和Aqua）热发射带的性能，重点是两种仪器之间的相对差异。来自红外大气探测干涉仪（IASI）的数据用作传输参考。使用来自Metop-A卫星和Terra / Aqua卫星的同时最低天桥（SNO）进行的观察进行比较。 SNO时间和位置是根据卫星轨道两线元素集确定的，SNO时间差限制在30秒以内。 IASI的每个12 km瞬时视场与多个MODIS像素并置。通过IASI高光谱数据和MODIS相对光谱响应函数的卷积，可以得出相应的IASI模拟的MODIS辐射度。数据分析结果表明，MODIS聚合亮度温度（BT）与IASI模拟的BT的相关性大于0.9。对于较低的BT，Aqua和Terra MODIS C5之间的差异在2至6 K之间，对于较高的BT，对于20-25和27-30的光伏波段，差异在±1 K之内。与C6产品的相应差异显着减小到小于2 K（20带除外）。对于光电导带31-36，来自MODIS C5和C6的测量值在Aqua和Terra之间几乎在±1 K之内。

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