Retrievals of sea surface temperature from infrared imagery: origin and form of systematic errors
Retrievals of sea surface temperature from infrared imagery: origin and form of systematic errors
复制标题
从红外图像中反演海面温度：系统误差的起源和形式
DOI：
10.1256/qj.05.143
复制
发表时间：
2006
影响因子：
8.9
通讯作者：
A. O'carroll
中科院分区：
文献类型：
--
作者：
C. Merchant;L. Horrocks;J. Eyre;A. O'carroll
我们发现，反演的海表面温度从卫星红外图像容易出现两种形式的系统误差：先验误差（熟悉的大气探测理论）和非线性引起的误差。这些误差具有不同的复杂地理变化，与确定海洋上空晴空亮温的主要地球物理变量的不同地理分布有关。我们表明，这样的错误出现作为一个内在的后果的形式的检索（而不是作为一个次优指定的检索系数的结果，因为通常假设），并观察到的错误模式可以使用辐射传输模型进行详细模拟。先验误差具有大气探测中常见的线性形式。导出了非线性误差的二次方程，并验证了在这种情况下，非线性误差主要表现出二次行为。版权所有© 2006年皇家气象学会。
We show that retrievals of sea surface temperature from satellite infrared imagery are prone to two forms of systematic error: prior error (familiar from the theory of atmospheric sounding) and error arising from nonlinearity. These errors have different complex geographical variations, related to the differing geographical distributions of the main geophysical variables that determine clear‐sky brightness‐temperatures over the oceans. We show that such errors arise as an intrinsic consequence of the form of the retrieval (rather than as a consequence of sub‐optimally specified retrieval coefficients, as is often assumed) and that the pattern of observed errors can be simulated in detail using radiative‐transfer modelling. The prior error has the linear form familiar from atmospheric sounding. A quadratic equation for nonlinearity error is derived, and it is verified that the nonlinearity error exhibits predominantly quadratic behaviour in this case. Copyright © 2006 Royal Meteorological Society.