DOI: 10.1007/s00382-017-4034-x
Scopus记录号: 2-s2.0-85038076507
论文题名: Reliable low precision simulations in land surface models
作者: Dawson A. ; Düben P.D. ; MacLeod D.A. ; Palmer T.N.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 51, 期: 2018-07-08 起始页码: 2657
结束页码: 2666
语种: 英语
英文关键词: Climate models
; Deep soil processes
; Floating-point arithmetic
; Land surface models
; Numerical precision
; Single precision arithmetic
Scopus关键词: accuracy assessment
; climate modeling
; computer simulation
; diffusion
; land surface
; precision
; soil
; uncertainty analysis
英文摘要: Weather and climate models must continue to increase in both resolution and complexity in order that forecasts become more accurate and reliable. Moving to lower numerical precision may be an essential tool for coping with the demand for ever increasing model complexity in addition to increasing computing resources. However, there have been some concerns in the weather and climate modelling community over the suitability of lower precision for climate models, particularly for representing processes that change very slowly over long time-scales. These processes are difficult to represent using low precision due to time increments being systematically rounded to zero. Idealised simulations are used to demonstrate that a model of deep soil heat diffusion that fails when run in single precision can be modified to work correctly using low precision, by splitting up the model into a small higher precision part and a low precision part. This strategy retains the computational benefits of reduced precision whilst preserving accuracy. This same technique is also applied to a full complexity land surface model, resulting in rounding errors that are significantly smaller than initial condition and parameter uncertainties. Although lower precision will present some problems for the weather and climate modelling community, many of the problems can likely be overcome using a straightforward and physically motivated application of reduced precision. © 2017, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109098
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Oxford, United Kingdom; European Centre for Medium-Range Weather Forecasts, Shinfield Park, Reading, United Kingdom
Recommended Citation:
Dawson A.,Düben P.D.,MacLeod D.A.,et al. Reliable low precision simulations in land surface models[J]. Climate Dynamics,2018-01-01,51(2018-07-08)