An update on the RTTOV fast radiative transfer model (currently at version 12)
An update on the RTTOV fast radiative transfer model (currently at version 12)
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DOI：
10.5194/gmd-2018-64
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发表时间：
2018
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通讯作者：
R. Saunders;James Hocking;E. Turner;P. Rayer;D. Rundle;P. Brunel;J. Vidot;Pascale Roquet;M. Matricardi;A. Geer;N. Bormann;C. Lupu
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作者：
R. Saunders;James Hocking;E. Turner;P. Rayer;D. Rundle;P. Brunel;J. Vidot;Pascale Roquet;M. Matricardi;A. Geer;N. Bormann;C. Lupu
本文对卫星反演和资料同化领域广泛使用的RTTOV（Radiative Transfer for TOVS）快速辐射传输模式进行了改进。RTTOV是一个快速辐射传输模型，用于模拟被动可见光、红外和微波下视卫星辐射计的大气层顶部辐射。除了前向模型之外，它还可选地计算切线线性、伴随和雅可比矩阵，该矩阵假设关于给定大气状态的线性关系，提供廓线变量扰动的辐射变化。这使得它成为一个有用的工具，用于开发物理检索从卫星辐射，直接辐射同化NWP模式，模拟未来的仪器，并与图形用户界面的培训或教学。RTTOV模型的概述，突出的更新和增加的能力，最新版本，它给出了一些例子，其当前的性能相比，更准确的逐线辐射传输模型和一些选定的观测。证明了对1999年发布的模型的原始版本的改进。
This paper gives an update of the RTTOV (Radiative Transfer for TOVS) fast radiative transfer model, which is widely used in the satellite retrieval and data assimilation communities. RTTOV is a fast radiative transfer model for simulating top-of-atmosphere radiances from passive visible, infrared and microwave downward-viewing satellite radiometers. In addition to the forward model, it also optionally computes the tangent linear, adjoint and Jacobian matrix providing changes in radiances for profile variable perturbations assuming a linear relationship about a given atmospheric state. This makes it a useful tool for developing physical retrievals from satellite radiances, for direct radiance assimilation in NWP models, for simulating future instruments, and for training or teaching with a graphical user interface. An overview of the RTTOV model is given, highlighting the updates and increased capability of the latest versions, and it gives some examples of its current performance when compared with more accurate line-by-line radiative transfer models and a few selected observations. The improvement over the original version of the model released in 1999 is demonstrated.