DOI: 10.1002/2013MS000251
Scopus记录号: 2-s2.0-84899053365
论文题名: A sampling method for improving the representation of spatially varying precipitation and soil moisture using the Simple Biosphere Model
作者: Medina I ; D ; , Denning A ; S ; , Baker I ; T ; , Ramirez J ; A ; , Randall D ; A
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2014
卷: 6, 期: 1 起始页码: 9
结束页码: 20
语种: 英语
英文关键词: Biospherics
; Soil moisture
; Computational costs
; Exponential distributions
; General circulation model
; Hydrologic effects
; Numerical experiments
; Precipitation intensity
; Randomly distributed
; Spatial variability
; Numerical methods
; arid region
; climate effect
; climatic region
; general circulation model
; heterogeneity
; hydrological response
; precipitation (climatology)
; sampling
; semiarid region
; soil moisture
英文摘要: Representing spatially varying precipitation for current grid length scales used in General Circulation Models (GCMs) is a continuing challenge. Furthermore, to fully capture the hydrologic effects of nonuniform precipitation, a representation of soil moisture heterogeneity and distribution of spatially varying precipitation must exist within the same framework. For this study, the explicit and sampling methods of Sellers et al. (2007) are tested off-line using the Simple Biosphere Model (SiB3) in an arid, semiarid, and wet site, and are numerically compared to the bulk method, which is currently used in GCMs. To carry out the numerical experiments, an arbitrary grid area was defined by (1) a single instance of SiB3 (bulk method), (2) 100 instances of SiB3 (explicit method), and (3) less than 100 instances of SiB3 (sampling method). Precipitation was randomly distributed over fractions of the grid area for the explicit and sampling methods, while the standard SiB3 exponential distribution relating precipitation intensity to the grid area wet fraction was used in the bulk method. Comparing the sampling and bulk method to the explicit method indicates that 10 instances of SiB3 in the sampling method better captures the spatial variability in soil moisture and grid area flux calculations produced by the explicit method, and deals realistically with spatially varying precipitation at little additional computational cost to the bulk method. Key Points Spatially varying precipitation and soil moisture are simulated with SiB3 Bulk and sampled method simulations are compared to an explicit method Sampled method simulations approach the explicit method ©2013. 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/76097
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Atmospheric Science, Colorado State University, Fort Collins CO, United States; Department of Civil and Environmental Engineering, Colorado State University, Fort Collins CO, United States
Recommended Citation:
Medina I,D,, Denning A,et al. A sampling method for improving the representation of spatially varying precipitation and soil moisture using the Simple Biosphere Model[J]. Journal of Advances in Modeling Earth Systems,2014-01-01,6(1)