A Physical Method for the Calibration of the AVHRR/3 Thermal IR Channels. Part II: An In-Orbit Comparison of the AVHRR Longwave Thermal IR Channels on boardMetOp-Awith IASI
A Physical Method for the Calibration of the AVHRR/3 Thermal IR Channels. Part II: An In-Orbit Comparison of the AVHRR Longwave Thermal IR Channels on boardMetOp-Awith IASI
复制标题
AVHRR/3 热红外通道校准的物理方法。
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
A. Harris
中科院分区：
文献类型：
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作者：
J. Mittaz;A. Harris
为气候变化研究获取稳定、准确的卫星辐射对卫星定标要求极高。许多卫星传感器目前不符合精度标准，特别是传统传感器，如先进超高分辨率辐射计（AVHRR），它显示的场景温度依赖趋势和偏差高达0.5 K。然而，最近对AVHRR/3发射前数据的详细研究表明，标定算法和发射前数据都存在显著问题，表明AVHRR的固有精度实际上可能相当高。已经提出了一种新的方法，可以解决当前（操作）校准中的许多问题，但尚未应用于在轨情况。本文对AVHRR的在轨性能进行了研究，并与气象业务(MetOp)-A的实际AVHRR辐射与基于红外大气声辐射新定标的AVHRR辐射进行了比较。
AbstractObtaining stable and accurate satellite radiances for climate change research requires extremely high standards for satellite calibration. Many satellite sensors do not currently meet the accuracy criteria, especially heritage sensors such as the Advanced Very High Resolution Radiometer (AVHRR), which shows scene temperature–dependent trends and biases of up to 0.5 K. Recently, however, a detailed study of the AVHRR/3 prelaunch data showed significant problems with both the calibration algorithm and the prelaunch data and indicated that the inherent accuracy of the AVHRR may actually be quite high. A new approach has been suggested that fixed many of the issues with the current (operational) calibration, but has not yet been applied to the in-orbit case. In this paper the behavior of the AVHRR in orbit is examined and compared to the operational AVHRR radiances from the Meteorological Operation (MetOp)-A with those based on the new calibration to radiances derived from the Infrared Atmosphere Soun...