DOI: 10.1029/2018JD028657
Scopus记录号: 2-s2.0-85048958551
论文题名: Modeling of Nonlocal Thermodynamic Equilibrium Effects in the Classical and Principal Component-Based Version of the RTTOV Fast Radiative Transfer Model
作者: Matricardi M. ; López-Puertas M. ; Funke B.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 11 起始页码: 5741
结束页码: 5761
语种: 英语
英文关键词: Earth's atmosphere
; fast radiative transfer model
; infrared emission
; non-LTE
; principal component analysis
; satellite sounding
Scopus关键词: accuracy assessment
; AIRS
; data assimilation
; equilibrium
; infrared radiation
; model
; modeling
; parameterization
; principal component analysis
; radiative transfer
; satellite data
; sensor
; thermodynamic property
英文摘要: The direct assimilation in 4D-Var of principal component (PC) scores derived from Infrared Atmospheric Sounding Interferometer (IASI) spectra has recently been demonstrated. To maximize the exploitation of the IASI instrument, a future step is to consider the extension of the PC approach to the extraction of information from the 4.3-μm CO2-absorbing region. Shortwave IASI channels are currently underused compared to similar longwave channels because of day-night variations in data usability due to departures from local thermodynamic equilibrium (LTE). In this paper, we document the introduction of non-LTE (NLTE) effects in the PC-based version of the radiative transfer for TIROS operational vertical sounder (RTTOV) fast radiative transfer model (PC-RTTOV). The inclusion of NLTE effects in PC-RTTOV has required the development of a parameterized scheme that allows the fast computation of a NLTE correction to LTE radiances. The fast NLTE model is general enough to be applied to any sensor and can be utilized to add a fast and accurate NLTE correction to polychromatic LTE spectra computed by any general radiative transfer model, including RTTOV, which now incorporates the fast NLTE model developed in this study. The accuracy of the NLTE correction is such that daytime and nighttime radiances can be simulated to almost the same degree of accuracy. The comparison with IASI observations shows that the fast NLTE model presented here performs significantly better than the fast NLTE model incorporated in the previous version of RTTOV and also that improvements have to be made to the simulation of NLTE effects at winter high latitudes. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113721
Appears in Collections: 气候减缓与适应
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作者单位: ECMWF, Reading, United Kingdom; Instituto de Astrofisica de Andalucia, CSIC, Granada, Spain
Recommended Citation:
Matricardi M.,López-Puertas M.,Funke B.. Modeling of Nonlocal Thermodynamic Equilibrium Effects in the Classical and Principal Component-Based Version of the RTTOV Fast Radiative Transfer Model[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(11)