An Infrared Atmospheric Sounding Interferometer – New Generation (IASI-NG) channel selection for numerical weather prediction,Quarterly Journal of the Royal Meteorological Society

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An Infrared Atmospheric Sounding Interferometer – New Generation (IASI-NG) channel selection for numerical weather prediction
Quarterly Journal of the Royal Meteorological Society ( IF 3.0 ) Pub Date : 2021-07-16 , DOI: 10.1002/qj.4129
F. Vittorioso ₁ , V. Guidard ₁ , N. Fourrié ₁

Affiliation

In the framework of the EUMETSAT Polar System–Second Generation (EPS-SG) preparation, a new generation of the Infrared Atmospheric Sounding Interferometer (IASI) instrument has been designed. The IASI-New Generation (IASI-NG) will measure radiances at a doubled spectral resolution compared to its predecessor and with a signal-to-noise ratio improved by a factor of 2. The large amount of data arising from IASI-NG will present many challenges for data transmission, storage and assimilation. Moreover, the full set of measured radiances will not be exploitable in an operational numerical weather prediction (NWP) context. For these reasons, an appropriate IASI-NG channel selection in needed, aiming to select the most informative channels for NWP models. Therefore, the standard iterative channel selection methodology, based on the optimal linear estimation theory and assuming spectrally correlated errors, has been applied to a set of simulated data of the IASI-NG spectrum. The entire simulated IASI-NG spectrum has been first investigated, while finally focusing the channel selection procedure on the most interesting wavelength ranges for the assimilation. Through this process, a total of 500 channels have been chosen to serve as a basis for future channel selections to be provided to NWP centres – 277 temperature, 23 surface-sensitive and 200 water vapour channels. One-dimensional variational (1D-Var) assimilation experiments show that using this selected set of channels leads to a reduction of the standard deviation of the error in temperature (up to 30%) and water vapour (up to 50%) profiles with respect to the

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information.

中文翻译：

红外大气探测干涉仪——用于数值天气预报的新一代 (IASI-NG) 通道选择

在 EUMETSAT 极地系统-第二代（EPS-SG）准备框架内，设计了新一代红外大气探测干涉仪（IASI）仪器。IASI-New Generation (IASI-NG) 将以比其前身翻倍的光谱分辨率测量辐射，并且信噪比提高 2 倍。 IASI-NG 产生的大量数据将呈现数据传输、存储和同化面临诸多挑战。此外，在业务数值天气预报 (NWP) 环境中无法利用全套测量辐射。由于这些原因，需要适当的 IASI-NG 频道选择，旨在为 NWP 模型选择信息最丰富的频道。因此，标准的迭代通道选择方法，基于最优线性估计理论并假设谱相关误差，已应用于一组 IASI-NG 谱的模拟数据。首先研究了整个模拟的 IASI-NG 光谱，最后将信道选择程序集中在最有趣的波长范围上以进行同化。通过这一过程，总共选择了 500 个通道作为未来提供给 NWP 中心的通道选择的基础——277 个温度通道、23 个表面敏感通道和 200 个水汽通道。一维变分 (1D-Var) 同化实验表明，使用这组选定的通道可以降低温度（高达 30%）和水蒸气（高达 50%）剖面的标准偏差。到

一种 磷 r 一世 ○ r 一世

信息。

更新日期：2021-09-06

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