气候变化领域集成服务门户(CCPortal): Neighboring Column Approximation—An Improved 3D Thermal Radiative Transfer Approximation for Non-Rectangular Grids

CCPortal

DOI	10.1029/2019MS001843
	Neighboring Column Approximation—An Improved 3D Thermal Radiative Transfer Approximation for Non-Rectangular Grids
	Klinger C.; Mayer B.
发表日期	2020
ISSN	19422466
卷号	12 期号:1
英文摘要	We present a significantly improved version of the Neighboring Column Approximation (NCA 2.0), a fast 3D approximation for the calculation of thermal heating and cooling rates in cloudy atmospheres for large eddy simulation models. The method can now be used on non-rectangular grids, and the heating rate bias in cloudy atmospheres is substantially reduced compared to a 1D solution and the original version of the NCA (NCA 1.0). For different cloud fields the bias is in the range of -5–30% in the 1D case and -2–7% for the NCA 2.0. The calculation of 3D radiative transfer quantities requires horizontal transport of radiation which causes difficulties in the parallelization of numerical models and is computationally expensive. The NCA overcomes this problem and can calculate 3D thermal heating rates at the expense of only a factor 1.5 to 2 higher compared to a 1D radiative transfer approximation. The method uses the fluxes calculated by a 1D radiation scheme and estimates horizontal fluxes using results from neighboring columns. For the estimation of the heating rates from the before estimated fluxes pre-calculated lookup tables of emissivities are used. For the calculation of the heating rates we neglect scattering (independent of the fact if the incoming fluxes consider scattering or not). Inconsistencies made by assumptions for the method are corrected by a correction factor. ©2019. The Authors.
英文关键词	3D Radiative Transfer; LES; Radiative Transfer Approximation
语种	英语
scopus关键词	Heating; Heating rate; Large eddy simulation; Table lookup; Cloudy atmospheres; Correction factors; Horizontal fluxes; Horizontal transport; Parallelizations; Rectangular grids; Thermal heating; Thermal radiative transfer; Radiative transfer; cooling; heating; large eddy simulation; radiative transfer; scattering; three-dimensional modeling
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156781
作者单位	Lehrstuhl für Experimentelle Meteorologie, Ludwig-Maximilians-Universität München, Munich, Germany
推荐引用方式 GB/T 7714	Klinger C.,Mayer B.. Neighboring Column Approximation—An Improved 3D Thermal Radiative Transfer Approximation for Non-Rectangular Grids[J],2020,12(1).
APA	Klinger C.,&Mayer B..(2020).Neighboring Column Approximation—An Improved 3D Thermal Radiative Transfer Approximation for Non-Rectangular Grids.Journal of Advances in Modeling Earth Systems,12(1).
MLA	Klinger C.,et al."Neighboring Column Approximation—An Improved 3D Thermal Radiative Transfer Approximation for Non-Rectangular Grids".Journal of Advances in Modeling Earth Systems 12.1(2020).