DOI: 10.1002/2016MS000764
Scopus记录号: 2-s2.0-85016981584
论文题名: Closing the scale gap between land surface parameterizations and GCMs with a new scheme, SiB3-Bins
作者: Baker I ; T ; , Sellers P ; J ; , Denning A ; S ; , Medina I ; , Kraus P ; , Haynes K ; D ; , Biraud S ; C
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 1 起始页码: 691
结束页码: 711
语种: 英语
英文关键词: Catchments
; Evapotranspiration
; Moisture
; Soils
; Surface measurement
; Catchment hydrology
; Conceptual frameworks
; General circulation model
; Land surface parameterization
; Nonlinear behavior
; Spatio-temporal dynamics
; Statistical-dynamical
; Sub-grid variability
; Soil moisture
; atmosphere-biosphere interaction
; catchment
; conceptual framework
; evapotranspiration
; general circulation model
; heterogeneity
; land surface
; nonlinearity
; parameterization
; saturation
; soil moisture
; vegetation type
英文摘要: The interaction of land with the atmosphere is sensitive to soil moisture (W). Evapotranspiration (ET) reacts to soil moisture in a nonlinear way, f(W), as soils dry from saturation to wilt point. This nonlinear behavior and the fact that soil moisture varies on scales as small as 1–10 m in nature, while numerical general circulation models (GCMs) have grid cell sizes on the order of 1 to 100s of kilometers, makes the calculation of grid cell-average ET problematic. It is impractical to simulate the land in GCMs on the small scales seen in nature, so techniques have been developed to represent subgrid scale heterogeneity, including: (1) statistical-dynamical representations of grid subelements of varying wetness, (2) relaxation of f(W), (3) moderating f(W) with approximations of catchment hydrology, (4) “tiling” the landscape into vegetation types, and (5) hyperresolution. Here we present an alternative method for representing subgrid variability in W, one proven in a conceptual framework where landscape-scale W is represented as a series of “Bins” of increasing wetness from dry to saturated. The grid cell-level f(W) is defined by the integral of the fractional area of the wetness bins and the value of f(W) associated with each. This approach accounts for the spatiotemporal dynamics of W. We implemented this approach in the SiB3 land surface parameterization and then evaluated its performance against a control, which assumes a horizontally uniform field of W. We demonstrate that the Bins method, with a physical basis, attenuates unrealistic jumps in model state and ET seen in the control runs. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75811
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: Colorado State University, Atmospheric Science Department, Fort Collins, CO, United States; Deceased 23 December 2016; Formerly NASA Goddard Space Flight Center, United States; Lawrence Berkeley National Laboratory, Berkeley, CA, United States
Recommended Citation:
Baker I,T,, Sellers P,et al. Closing the scale gap between land surface parameterizations and GCMs with a new scheme, SiB3-Bins[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(1)