DOI: 10.1016/j.jag.2011.12.007
Scopus记录号: 2-s2.0-84883019645
论文题名: A gibbs sampling disaggregation model for orographic precipitation
作者: Gagnon P ; , Rousseau A ; N ; , Mailhot A ; , Caya D
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2013
卷: 22, 期: 1 起始页码: 16
结束页码: 26
语种: 英语
英文关键词: Cascade Range
; Gibbs sampling
; Olympic Mountains
; Orographic precipitation
; Statistical disaggregation
Scopus关键词: algorithm
; climate modeling
; hydrological modeling
; mesoscale meteorology
; orographic effect
; precipitation (climatology)
; regional climate
; sampling
; spatial data
; spatial resolution
; statistical analysis
; topography
; Cascade Range
; Coast Ranges
; Olympic Mountains
; United States
; Washington [United States]
英文摘要: Hydrological applications in complex topographic areas need high spatial resolution precipitation data. Some daily high-resolution products are now available for recent past data, even in complex terrain. While the spatial resolution of Regional Climate Models (RCMs) and operational meteorological models are becoming increasingly fine, there still exists a mismatch between the spatial resolutions of observed or estimated recent past data and simulated or forecasted precipitation. Statistical disaggregation models can generate precipitation on a high-resolution grid using as input a mesoscale precipitation grid (e.g., RCM or meteorological grid). In this paper, a Gibbs sampling disaggregation model previously developed for flat areas is adapted to account for topography. Only one variable, the topographic anomaly, is added to the original model. The model is applied on a 300 km × 300 km area in the northwestern United States, covering the Olympic Mountains and the Cascade Range. Daily high-resolution precipitation data for the 2002-2005 period are used to estimate the model parameters. Using 750 days taken from the 2006-2008 period, 36, 52-km grid boxes are disaggregated on 4.3-, 8.7-, 13-, 17.3-and 26-km grids; each day being simulated nine times. Thank to the Gibbs sampling algorithm, the original model, which does not account for topography, is able to capture the mesoscale topographic structure of the daily precipitation, while the adapted model accounting for topography is better suited to recreate the local impact of topography on interannual means, interday standard deviation, and maximum values. The model outputs could be used by hydrological modelers who need high-resolution precipitation data in complex topographic area application. © 2011 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79804
Appears in Collections: 气候变化事实与影响
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作者单位: Institut National de la Recherche Scientifique, Centre Eau Terre et Environnement, 490 de la Couronne, Québec City, QC, Canada; Consortium Ouranos, 550, Sherbrooke Ouest Tour Ouest, 19e étage, Montréal, QC, Canada
Recommended Citation:
Gagnon P,, Rousseau A,N,et al. A gibbs sampling disaggregation model for orographic precipitation[J]. International Journal of Applied Earth Observation and Geoinformation,2013-01-01,22(1)