DOI: 10.1175/JCLI-D-12-00318.1
Scopus记录号: 2-s2.0-84880323615
论文题名: Effects of spectral nudging in WRF on arctic temperature and precipitation simulations
作者: Glisan J.M. ; Gutowski Jr. W.J. ; Cassano J.J. ; Higgins M.E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 12 起始页码: 3985
结束页码: 3999
语种: 英语
Scopus关键词: Arctic
; Extreme events
; Model evaluation/performance
; Regional model
; Surface temperatures
; Atmospheric temperature
; Climate models
; Precipitation (chemical)
; Weather forecasting
; Computer simulation
; arctic environment
; climate modeling
; extreme event
; numerical model
; precipitation (climatology)
; surface temperature
; weather forecasting
英文摘要: Spectral (interior) nudging is a way of constraining a model to be more consistent with observed behavior. However, such control over model behavior raises concerns over how much nudging may affect unforced variability and extremes. Strong nudging may reduce or filter out extreme events since nudging pushes the model toward a relatively smooth, large-scale state. The question then becomes: what is the minimum spectral nudging needed to correct biases while not limiting the simulation of extreme events? To determine this, case studies were performed using a six-member ensemble of the Pan-Arctic Weather Research and Forecasting model (WRF) with varying spectral nudging strength, using WRF's standard nudging as a reference point. Two periods were simulated, one in a cold season (January 2007) and one in a warm season (July 2007). Precipitation and 2-m temperature were analyzed to determine how changing spectral nudging strength impacts temperature and precipitation extremes and selected percentiles. Results suggest that there is a marked lack of sensitivity to varying degrees of nudging. Moreover, given that nudging is an artificial forcing applied in the model, an outcome of this work is that nudging strength can be considerably smaller than the WRF standard strength and still produce climate simulations that are much better than using no nudging. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51856
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geological and Atmospheric Sciences, Iowa State University, Ames, IA, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States
Recommended Citation:
Glisan J.M.,Gutowski Jr. W.J.,Cassano J.J.,et al. Effects of spectral nudging in WRF on arctic temperature and precipitation simulations[J]. Journal of Climate,2013-01-01,26(12)